[repo.or.cz] gfxprim.git branch master updated: e5413bf88214d6a7a13b0ad251befe8098a5e387 - Gfxprim

12 Jan 2013

This is an automated email from the git hooks/post-receive script. It was
generated because a ref change was pushed to the repository containing
the project gfxprim.git.
The branch, master has been updated
       via  e5413bf88214d6a7a13b0ad251befe8098a5e387 (commit)
      from  e40b6e745f6ca131059addb2b05297eccf9a474a (commit)
Those revisions listed above that are new to this repository have
not appeared on any other notification email; so we list those
revisions in full, below.
- Log -----------------------------------------------------------------
http://repo.or.cz/w/gfxprim.git/commit/e5413bf88214d6a7a13b0ad251befe8098a5e...
commit e5413bf88214d6a7a13b0ad251befe8098a5e387
Author: Cyril Hrubis metan@ucw.cz
Date:   Fri Jan 11 15:11:02 2013 +0100
doc: Edhance coordinate system description.

diff --git a/doc/coordinate_system.txt b/doc/coordinate_system.txt
index fb3f408..7ef9081 100644
--- a/doc/coordinate_system.txt
+++ b/doc/coordinate_system.txt
@@ -1,11 +1,30 @@
 Coordinate System
 -----------------
-GFXprim uses Cartesian coordinate system. The pixel +(0, 0)+ lies at the upper
+Coordinates
+~~~~~~~~~~~
+
+GFXprim uses Cartesian coordinate system. The pixel '(0, 0)' lies at the upper
 left corner of the bitmap and coordinates grows to the right and to the
-bottom. The last valid pixel, that still lies in the bitmap of size +w+ and
-+h+, occupies coordinates +(w - 1, h - 1)+. The precise position of the point
-with integer coordinates is in the middle of the pixel (and borders between
-the pixels lies are integers + 0.5).
+bottom. The last valid pixel, that still lies in the bitmap of size 'w' and
+'h', occupies coordinate '(w-1,h-1)'. The precise position of the point with
+integer coordinates is in the middle of the pixel (and borders between the
+pixels lies are integers + 0.5).
+
+[[Coordinates]]
+.GFXprim coordinate system and GP_LineXYXY(5, 3, 9, 3)
+image::coordinates-1.svg["Coordinate system"]
+
+Width and Height
+~~~~~~~~~~~~~~~~
+
+The width and height, when passed as an argument, are interpreted as number of
+pixels to draw (rather than lengt from one pixel center to another pixel
+center). Which means that for rectangle of size '(w,h)' starting at '(x,y)'
+first pixel to draw would be '(x,y)' and last one would be '(x+w-1,y+h-1)'.
+Especially when 'w' or 'h' is less than or equal to zero no action is taken.
+
+[[Coordinates_Rectangle]]
+.GP_RectangleXYWH(2, 1, 8, 4)
+image::coordinates-2.svg["Coordinates Rectangle"]
-image:coordinates-1.svg[Coordinate System]
diff --git a/doc/coordinates-1.svg b/doc/coordinates-1.svg
index 841444d..427b812 100644
--- a/doc/coordinates-1.svg
+++ b/doc/coordinates-1.svg
@@ -9,8 +9,8 @@
    xmlns="http://www.w3.org/2000/svg"
    xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
    version="1.1"
-   width="546.91302"
-   height="426.914"
+   width="666.91302"
+   height="366.91162"
    id="svg2"
    xml:space="preserve"><metadata
      id="metadata8">rdf:RDF<cc:Work
@@ -18,159 +18,213 @@
            rdf:resource="http://purl.org/dc/dcmitype/StillImage" /></cc:Work></rdf:RDF></metadata><defs
      id="defs6"><clipPath
        id="clipPath18"><path
-         d="m 0,0 437.5304,0 0,341.5312 L 0,341.5312 0,0 z"
+         d="m 0,0 533.5304,0 0,293.5293 L 0,293.5293 0,0 z"
          inkscape:connector-curvature="0"
          id="path20" /></clipPath></defs><g
-     transform="matrix(1.25,0,0,-1.25,0,426.914)"
+     transform="matrix(1.25,0,0,-1.25,0,366.91162)"
      id="g10"><g
        id="g12"><g
          id="g14"><g
            clip-path="url(#clipPath18)"
            id="g16"><g
-             transform="translate(0,341.5312)"
+             transform="translate(0,293.5293)"
              id="g22"><g
-               transform="translate(3.5304,-339.5312)"
-               id="g24"><path
-                 d="M 0,0 432,0"
-                 inkscape:connector-curvature="0"
-                 id="path26"
-                 style="fill:none;stroke:#000000;stroke-width:0.5;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:10;stroke-opacity:1;stroke-dasharray:none" /><path
-                 d="m 0,48 432,0"
-                 inkscape:connector-curvature="0"
-                 id="path28"
-                 style="fill:none;stroke:#000000;stroke-width:0.5;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:10;stroke-opacity:1;stroke-dasharray:none" /><path
-                 d="m 0,96 432,0"
-                 inkscape:connector-curvature="0"
-                 id="path30"
-                 style="fill:none;stroke:#000000;stroke-width:0.5;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:10;stroke-opacity:1;stroke-dasharray:none" /><path
-                 d="m 0,144 432,0"
-                 inkscape:connector-curvature="0"
-                 id="path32"
-                 style="fill:none;stroke:#000000;stroke-width:0.5;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:10;stroke-opacity:1;stroke-dasharray:none" /><path
-                 d="m 0,192 432,0"
-                 inkscape:connector-curvature="0"
-                 id="path34"
-                 style="fill:none;stroke:#000000;stroke-width:0.5;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:10;stroke-opacity:1;stroke-dasharray:none" /><path
-                 d="m 0,240 432,0"
-                 inkscape:connector-curvature="0"
-                 id="path36"
-                 style="fill:none;stroke:#000000;stroke-width:0.5;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:10;stroke-opacity:1;stroke-dasharray:none" /><path
-                 d="m 0,288 432,0"
-                 inkscape:connector-curvature="0"
-                 id="path38"
-                 style="fill:none;stroke:#000000;stroke-width:0.5;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:10;stroke-opacity:1;stroke-dasharray:none" /><path
-                 d="m 0,336 432,0"
-                 inkscape:connector-curvature="0"
-                 id="path40"
-                 style="fill:none;stroke:#000000;stroke-width:0.5;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:10;stroke-opacity:1;stroke-dasharray:none" /><path
-                 d="M 0,0 0,336"
-                 inkscape:connector-curvature="0"
-                 id="path42"
-                 style="fill:none;stroke:#000000;stroke-width:0.5;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:10;stroke-opacity:1;stroke-dasharray:none" /><path
-                 d="m 48,0 0,336"
-                 inkscape:connector-curvature="0"
-                 id="path44"
-                 style="fill:none;stroke:#000000;stroke-width:0.5;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:10;stroke-opacity:1;stroke-dasharray:none" /><path
-                 d="m 96,0 0,336"
-                 inkscape:connector-curvature="0"
-                 id="path46"
-                 style="fill:none;stroke:#000000;stroke-width:0.5;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:10;stroke-opacity:1;stroke-dasharray:none" /><path
-                 d="m 144,0 0,336"
-                 inkscape:connector-curvature="0"
-                 id="path48"
-                 style="fill:none;stroke:#000000;stroke-width:0.5;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:10;stroke-opacity:1;stroke-dasharray:none" /><path
-                 d="m 192,0 0,336"
-                 inkscape:connector-curvature="0"
-                 id="path50"
-                 style="fill:none;stroke:#000000;stroke-width:0.5;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:10;stroke-opacity:1;stroke-dasharray:none" /><path
-                 d="m 240,0 0,336"
-                 inkscape:connector-curvature="0"
-                 id="path52"
-                 style="fill:none;stroke:#000000;stroke-width:0.5;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:10;stroke-opacity:1;stroke-dasharray:none" /><path
-                 d="m 288,0 0,336"
-                 inkscape:connector-curvature="0"
-                 id="path54"
-                 style="fill:none;stroke:#000000;stroke-width:0.5;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:10;stroke-opacity:1;stroke-dasharray:none" /><path
-                 d="m 336,0 0,336"
-                 inkscape:connector-curvature="0"
-                 id="path56"
-                 style="fill:none;stroke:#000000;stroke-width:0.5;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:10;stroke-opacity:1;stroke-dasharray:none" /><path
-                 d="m 384,0 0,336"
-                 inkscape:connector-curvature="0"
-                 id="path58"
-                 style="fill:none;stroke:#000000;stroke-width:0.5;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:10;stroke-opacity:1;stroke-dasharray:none" /><path
-                 d="m 432,0 0,336"
-                 inkscape:connector-curvature="0"
-                 id="path60"
-                 style="fill:none;stroke:#000000;stroke-width:0.5;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:10;stroke-opacity:1;stroke-dasharray:none" /><path
-                 d="M 0,336 0,0"
-                 inkscape:connector-curvature="0"
-                 id="path62"
-                 style="fill:none;stroke:#000000;stroke-width:4;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:10;stroke-opacity:1;stroke-dasharray:none" /><path
-                 d="M -1.5304,3.6946 0,0 l 1.5304,3.6946 -3.0608,0 z"
-                 inkscape:connector-curvature="0"
-                 id="path64"
-                 style="fill:#000000;fill-opacity:1;fill-rule:nonzero;stroke:#000000;stroke-width:4;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:10;stroke-opacity:1;stroke-dasharray:none" /><path
-                 d="M 0,0 432,0"
-                 inkscape:connector-curvature="0"
-                 id="path66"
-                 style="fill:none;stroke:#000000;stroke-width:2;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:10;stroke-opacity:1;stroke-dasharray:none" /><path
-                 d="m 432,0 0,336"
-                 inkscape:connector-curvature="0"
-                 id="path68"
-                 style="fill:none;stroke:#000000;stroke-width:2;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:10;stroke-opacity:1;stroke-dasharray:none" /><path
-                 d="m 0,336 432,0"
-                 inkscape:connector-curvature="0"
-                 id="path70"
-                 style="fill:none;stroke:#000000;stroke-width:4;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:10;stroke-opacity:1;stroke-dasharray:none" /><path
-                 d="M 428.30338,334.46877 432,336 l -3.69662,1.53123 0,-3.06246 z"
-                 inkscape:connector-curvature="0"
-                 id="path72"
-                 style="fill:#000000;fill-opacity:1;fill-rule:nonzero;stroke:#000000;stroke-width:4;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:10;stroke-opacity:1;stroke-dasharray:none" /><g
-                 transform="translate(0,341.5312)"
-                 id="g74"><text
-                   transform="matrix(1,0,0,-1,12.1001,-24.0405)"
-                   id="text76"><tspan
+               transform="translate(3.5304,-291.5293)"
+               id="g24"><g
+                 transform="translate(0,293.5293)"
+                 id="g26"><text
+                   transform="matrix(1,0,0,-1,12.1001,-24.0386)"
+                   id="text28"><tspan
                      x="0 3.8744552 8.8557549 14.940911 19.922211"
                      y="0"
-                     id="tspan78"
+                     id="tspan30"
                      style="font-size:9.96259975px;font-variant:normal;font-weight:normal;writing-mode:lr-tb;fill:#000000;fill-opacity:1;fill-rule:nonzero;stroke:none;font-family:CMR10;-inkscape-font-specification:CMR10">(0,0)</tspan></text>
 <g
-                   transform="translate(0,-341.5312)"
-                   id="g80"><path
-                     d="m 24,312 0,0"
+                   transform="translate(0,-293.5293)"
+                   id="g32"><path
+                     d="m 24,264 0,0"
                      inkscape:connector-curvature="0"
-                     id="path82"
+                     id="path34"
                      style="fill:none;stroke:#000000;stroke-width:3;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:10;stroke-opacity:1;stroke-dasharray:none" /><g
-                     transform="translate(0,341.5312)"
-                     id="g84"><text
-                       transform="matrix(1,0,0,-1,386.4142,-312.0405)"
-                       id="text86"><tspan
+                     transform="translate(0,293.5293)"
+                     id="g36"><text
+                       transform="matrix(1,0,0,-1,482.4142,-264.0386)"
+                       id="text38"><tspan
                          x="0 3.8744552 11.069445 14.389979 19.371279 25.456436 30.991655 34.312191 39.293491"
                          y="0"
-                         id="tspan88"
+                         id="tspan40"
                          style="font-size:9.96259975px;font-variant:normal;font-weight:normal;writing-mode:lr-tb;fill:#000000;fill-opacity:1;fill-rule:nonzero;stroke:none;font-family:CMR10;-inkscape-font-specification:CMR10">(w-1,h-1)</tspan></text>
 <g
-                       transform="translate(0,-341.5312)"
-                       id="g90"><path
-                         d="m 408,24 0,0"
+                       transform="translate(0,-293.5293)"
+                       id="g42"><path
+                         d="m 504,24 0,0"
                          inkscape:connector-curvature="0"
-                         id="path92"
+                         id="path44"
                          style="fill:none;stroke:#000000;stroke-width:3;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:10;stroke-opacity:1;stroke-dasharray:none" /><g
-                         transform="translate(0,341.5312)"
-                         id="g94"><text
-                           transform="matrix(1,0,0,-1,98.1,-120.9405)"
-                           id="text96"><tspan
+                         transform="translate(0,293.5293)"
+                         id="g46"><text
+                           transform="matrix(1,0,0,-1,98.1,-120.9386)"
+                           id="text48"><tspan
                              x="0 3.8744552 8.8557549 11.623365 16.604666 22.689821 27.671122"
                              y="0"
-                             id="tspan98"
+                             id="tspan50"
                              style="font-size:9.96259975px;font-variant:normal;font-weight:normal;writing-mode:lr-tb;fill:#000000;fill-opacity:1;fill-rule:nonzero;stroke:none;font-family:CMR10;-inkscape-font-specification:CMR10">(1.5,2)</tspan></text>
 <g
-                           transform="translate(0,-341.5312)"
-                           id="g100"><path
-                             d="m 96,216 0,0"
+                           transform="translate(0,-293.5293)"
+                           id="g52"><path
+                             d="m 96,168 0,0"
                              inkscape:connector-curvature="0"
-                             id="path102"
-                             style="fill:none;stroke:#000000;stroke-width:3;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:10;stroke-opacity:1;stroke-dasharray:none" /><g
-                             transform="translate(0,341.5312)"
-                             id="g104" /></g></g></g></g></g></g></g></g></g></g></g></g></svg>
 No newline at end of file
+                             id="path54"
+                             style="fill:none;stroke:#000000;stroke-width:3;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:10;stroke-opacity:1;stroke-dasharray:none" /><path
+                             d="m 240,96 48,0 0,48 -48,0 0,-48 z"
+                             inkscape:connector-curvature="0"
+                             id="path56"
+                             style="fill:#9999ff;fill-opacity:1;fill-rule:nonzero;stroke:none" /><path
+                             d="m 288,96 48,0 0,48 -48,0 0,-48 z"
+                             inkscape:connector-curvature="0"
+                             id="path58"
+                             style="fill:#9999ff;fill-opacity:1;fill-rule:nonzero;stroke:none" /><path
+                             d="m 336,96 48,0 0,48 -48,0 0,-48 z"
+                             inkscape:connector-curvature="0"
+                             id="path60"
+                             style="fill:#9999ff;fill-opacity:1;fill-rule:nonzero;stroke:none" /><path
+                             d="m 384,96 48,0 0,48 -48,0 0,-48 z"
+                             inkscape:connector-curvature="0"
+                             id="path62"
+                             style="fill:#9999ff;fill-opacity:1;fill-rule:nonzero;stroke:none" /><path
+                             d="m 432,96 48,0 0,48 -48,0 0,-48 z"
+                             inkscape:connector-curvature="0"
+                             id="path64"
+                             style="fill:#9999ff;fill-opacity:1;fill-rule:nonzero;stroke:none" /><g
+                             transform="translate(0,293.5293)"
+                             id="g66"><text
+                               transform="matrix(1,0,0,-1,252.1001,-168.0386)"
+                               id="text68"><tspan
+                                 x="0 3.8744552 8.8557549 14.940911 19.922211"
+                                 y="0"
+                                 id="tspan70"
+                                 style="font-size:9.96259975px;font-variant:normal;font-weight:normal;writing-mode:lr-tb;fill:#000000;fill-opacity:1;fill-rule:nonzero;stroke:none;font-family:CMR10;-inkscape-font-specification:CMR10">(5,3)</tspan></text>
+<g
+                               transform="translate(0,-293.5293)"
+                               id="g72"><path
+                                 d="m 264,120 0,0"
+                                 inkscape:connector-curvature="0"
+                                 id="path74"
+                                 style="fill:none;stroke:#000000;stroke-width:3;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:10;stroke-opacity:1;stroke-dasharray:none" /><g
+                                 transform="translate(0,293.5293)"
+                                 id="g76"><text
+                                   transform="matrix(1,0,0,-1,444.1001,-168.0386)"
+                                   id="text78"><tspan
+                                   x="0 3.8744552 8.8557549 14.940911 19.922211"
+                                   y="0"
+                                   id="tspan80"
+                                   style="font-size:9.96259975px;font-variant:normal;font-weight:normal;writing-mode:lr-tb;fill:#000000;fill-opacity:1;fill-rule:nonzero;stroke:none;font-family:CMR10;-inkscape-font-specification:CMR10">(9,3)</tspan></text>
+<g
+                                   transform="translate(0,-293.5293)"
+                                   id="g82"><path
+                                   d="m 456,120 0,0"
+                                   inkscape:connector-curvature="0"
+                                   id="path84"
+                                   style="fill:none;stroke:#000000;stroke-width:3;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:10;stroke-opacity:1;stroke-dasharray:none" /><path
+                                   d="M 0,0 528,0"
+                                   inkscape:connector-curvature="0"
+                                   id="path86"
+                                   style="fill:none;stroke:#000000;stroke-width:0.5;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:10;stroke-opacity:1;stroke-dasharray:none" /><path
+                                   d="m 0,48 528,0"
+                                   inkscape:connector-curvature="0"
+                                   id="path88"
+                                   style="fill:none;stroke:#000000;stroke-width:0.5;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:10;stroke-opacity:1;stroke-dasharray:none" /><path
+                                   d="m 0,96 528,0"
+                                   inkscape:connector-curvature="0"
+                                   id="path90"
+                                   style="fill:none;stroke:#000000;stroke-width:0.5;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:10;stroke-opacity:1;stroke-dasharray:none" /><path
+                                   d="m 0,144 528,0"
+                                   inkscape:connector-curvature="0"
+                                   id="path92"
+                                   style="fill:none;stroke:#000000;stroke-width:0.5;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:10;stroke-opacity:1;stroke-dasharray:none" /><path
+                                   d="m 0,192 528,0"
+                                   inkscape:connector-curvature="0"
+                                   id="path94"
+                                   style="fill:none;stroke:#000000;stroke-width:0.5;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:10;stroke-opacity:1;stroke-dasharray:none" /><path
+                                   d="m 0,240 528,0"
+                                   inkscape:connector-curvature="0"
+                                   id="path96"
+                                   style="fill:none;stroke:#000000;stroke-width:0.5;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:10;stroke-opacity:1;stroke-dasharray:none" /><path
+                                   d="m 0,288 528,0"
+                                   inkscape:connector-curvature="0"
+                                   id="path98"
+                                   style="fill:none;stroke:#000000;stroke-width:0.5;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:10;stroke-opacity:1;stroke-dasharray:none" /><path
+                                   d="M 0,0 0,288"
+                                   inkscape:connector-curvature="0"
+                                   id="path100"
+                                   style="fill:none;stroke:#000000;stroke-width:0.5;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:10;stroke-opacity:1;stroke-dasharray:none" /><path
+                                   d="m 48,0 0,288"
+                                   inkscape:connector-curvature="0"
+                                   id="path102"
+                                   style="fill:none;stroke:#000000;stroke-width:0.5;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:10;stroke-opacity:1;stroke-dasharray:none" /><path
+                                   d="m 96,0 0,288"
+                                   inkscape:connector-curvature="0"
+                                   id="path104"
+                                   style="fill:none;stroke:#000000;stroke-width:0.5;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:10;stroke-opacity:1;stroke-dasharray:none" /><path
+                                   d="m 144,0 0,288"
+                                   inkscape:connector-curvature="0"
+                                   id="path106"
+                                   style="fill:none;stroke:#000000;stroke-width:0.5;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:10;stroke-opacity:1;stroke-dasharray:none" /><path
+                                   d="m 192,0 0,288"
+                                   inkscape:connector-curvature="0"
+                                   id="path108"
+                                   style="fill:none;stroke:#000000;stroke-width:0.5;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:10;stroke-opacity:1;stroke-dasharray:none" /><path
+                                   d="m 240,0 0,288"
+                                   inkscape:connector-curvature="0"
+                                   id="path110"
+                                   style="fill:none;stroke:#000000;stroke-width:0.5;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:10;stroke-opacity:1;stroke-dasharray:none" /><path
+                                   d="m 288,0 0,288"
+                                   inkscape:connector-curvature="0"
+                                   id="path112"
+                                   style="fill:none;stroke:#000000;stroke-width:0.5;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:10;stroke-opacity:1;stroke-dasharray:none" /><path
+                                   d="m 336,0 0,288"
+                                   inkscape:connector-curvature="0"
+                                   id="path114"
+                                   style="fill:none;stroke:#000000;stroke-width:0.5;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:10;stroke-opacity:1;stroke-dasharray:none" /><path
+                                   d="m 384,0 0,288"
+                                   inkscape:connector-curvature="0"
+                                   id="path116"
+                                   style="fill:none;stroke:#000000;stroke-width:0.5;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:10;stroke-opacity:1;stroke-dasharray:none" /><path
+                                   d="m 432,0 0,288"
+                                   inkscape:connector-curvature="0"
+                                   id="path118"
+                                   style="fill:none;stroke:#000000;stroke-width:0.5;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:10;stroke-opacity:1;stroke-dasharray:none" /><path
+                                   d="m 480,0 0,288"
+                                   inkscape:connector-curvature="0"
+                                   id="path120"
+                                   style="fill:none;stroke:#000000;stroke-width:0.5;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:10;stroke-opacity:1;stroke-dasharray:none" /><path
+                                   d="m 528,0 0,288"
+                                   inkscape:connector-curvature="0"
+                                   id="path122"
+                                   style="fill:none;stroke:#000000;stroke-width:0.5;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:10;stroke-opacity:1;stroke-dasharray:none" /><path
+                                   d="M 0,288 0,0"
+                                   inkscape:connector-curvature="0"
+                                   id="path124"
+                                   style="fill:none;stroke:#000000;stroke-width:4;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:10;stroke-opacity:1;stroke-dasharray:none" /><path
+                                   d="M -1.5304,3.6946 0,0 l 1.5304,3.6946 -3.0608,0 z"
+                                   inkscape:connector-curvature="0"
+                                   id="path126"
+                                   style="fill:#000000;fill-opacity:1;fill-rule:nonzero;stroke:#000000;stroke-width:4;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:10;stroke-opacity:1;stroke-dasharray:none" /><path
+                                   d="M 0,0 528,0"
+                                   inkscape:connector-curvature="0"
+                                   id="path128"
+                                   style="fill:none;stroke:#000000;stroke-width:2;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:10;stroke-opacity:1;stroke-dasharray:none" /><path
+                                   d="m 528,0 0,288"
+                                   inkscape:connector-curvature="0"
+                                   id="path130"
+                                   style="fill:none;stroke:#000000;stroke-width:2;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:10;stroke-opacity:1;stroke-dasharray:none" /><path
+                                   d="m 0,288 528,0"
+                                   inkscape:connector-curvature="0"
+                                   id="path132"
+                                   style="fill:none;stroke:#000000;stroke-width:4;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:10;stroke-opacity:1;stroke-dasharray:none" /><path
+                                   d="M 524.30812,286.47073 528,288 l -3.69188,1.52927 0,-3.05854 z"
+                                   inkscape:connector-curvature="0"
+                                   id="path134"
+                                   style="fill:#000000;fill-opacity:1;fill-rule:nonzero;stroke:#000000;stroke-width:4;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:10;stroke-opacity:1;stroke-dasharray:none" /><g
+                                   transform="translate(0,293.5293)"
+                                   id="g136" /></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></svg>
 No newline at end of file
diff --git a/doc/coordinates-2.svg b/doc/coordinates-2.svg
new file mode 100644
index 0000000..ffa02d7
--- /dev/null
+++ b/doc/coordinates-2.svg
@@ -0,0 +1,308 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- Created with Inkscape (http://www.inkscape.org/) -->
+
+<svg
+   xmlns:dc="http://purl.org/dc/elements/1.1/"
+   xmlns:cc="http://creativecommons.org/ns#"
+   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+   xmlns:svg="http://www.w3.org/2000/svg"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
+   version="1.1"
+   width="666.91302"
+   height="366.91162"
+   id="svg2"
+   xml:space="preserve"><metadata
+     id="metadata8">rdf:RDF<cc:Work
+         rdf:about="">dc:formatimage/svg+xml</dc:format><dc:type
+           rdf:resource="http://purl.org/dc/dcmitype/StillImage" /></cc:Work></rdf:RDF></metadata><defs
+     id="defs6"><clipPath
+       id="clipPath18"><path
+         d="m 0,0 533.5304,0 0,293.5293 L 0,293.5293 0,0 z"
+         inkscape:connector-curvature="0"
+         id="path20" /></clipPath></defs><g
+     transform="matrix(1.25,0,0,-1.25,0,366.91162)"
+     id="g10"><g
+       id="g12"><g
+         id="g14"><g
+           clip-path="url(#clipPath18)"
+           id="g16"><g
+             transform="translate(0,293.5293)"
+             id="g22"><g
+               transform="translate(3.5304,-291.5293)"
+               id="g24"><g
+                 transform="translate(0,293.5293)"
+                 id="g26"><text
+                   transform="matrix(1,0,0,-1,12.1001,-24.0386)"
+                   id="text28"><tspan
+                     x="0 3.8744552 8.8557549 14.940911 19.922211"
+                     y="0"
+                     id="tspan30"
+                     style="font-size:9.96259975px;font-variant:normal;font-weight:normal;writing-mode:lr-tb;fill:#000000;fill-opacity:1;fill-rule:nonzero;stroke:none;font-family:CMR10;-inkscape-font-specification:CMR10">(0,0)</tspan></text>
+<g
+                   transform="translate(0,-293.5293)"
+                   id="g32"><path
+                     d="m 24,264 0,0"
+                     inkscape:connector-curvature="0"
+                     id="path34"
+                     style="fill:none;stroke:#000000;stroke-width:3;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:10;stroke-opacity:1;stroke-dasharray:none" /><path
+                     d="m 96,192 48,0 0,48 -48,0 0,-48 z"
+                     inkscape:connector-curvature="0"
+                     id="path36"
+                     style="fill:#99ff99;fill-opacity:1;fill-rule:nonzero;stroke:none" /><path
+                     d="m 96,144 48,0 0,48 -48,0 0,-48 z"
+                     inkscape:connector-curvature="0"
+                     id="path38"
+                     style="fill:#99ff99;fill-opacity:1;fill-rule:nonzero;stroke:none" /><path
+                     d="m 96,96 48,0 0,48 -48,0 0,-48 z"
+                     inkscape:connector-curvature="0"
+                     id="path40"
+                     style="fill:#99ff99;fill-opacity:1;fill-rule:nonzero;stroke:none" /><path
+                     d="m 96,48 48,0 0,48 -48,0 0,-48 z"
+                     inkscape:connector-curvature="0"
+                     id="path42"
+                     style="fill:#99ff99;fill-opacity:1;fill-rule:nonzero;stroke:none" /><path
+                     d="m 144,192 48,0 0,48 -48,0 0,-48 z"
+                     inkscape:connector-curvature="0"
+                     id="path44"
+                     style="fill:#99ff99;fill-opacity:1;fill-rule:nonzero;stroke:none" /><path
+                     d="m 144,144 48,0 0,48 -48,0 0,-48 z"
+                     inkscape:connector-curvature="0"
+                     id="path46"
+                     style="fill:#99ff99;fill-opacity:1;fill-rule:nonzero;stroke:none" /><path
+                     d="m 144,96 48,0 0,48 -48,0 0,-48 z"
+                     inkscape:connector-curvature="0"
+                     id="path48"
+                     style="fill:#99ff99;fill-opacity:1;fill-rule:nonzero;stroke:none" /><path
+                     d="m 144,48 48,0 0,48 -48,0 0,-48 z"
+                     inkscape:connector-curvature="0"
+                     id="path50"
+                     style="fill:#99ff99;fill-opacity:1;fill-rule:nonzero;stroke:none" /><path
+                     d="m 192,192 48,0 0,48 -48,0 0,-48 z"
+                     inkscape:connector-curvature="0"
+                     id="path52"
+                     style="fill:#99ff99;fill-opacity:1;fill-rule:nonzero;stroke:none" /><path
+                     d="m 192,144 48,0 0,48 -48,0 0,-48 z"
+                     inkscape:connector-curvature="0"
+                     id="path54"
+                     style="fill:#99ff99;fill-opacity:1;fill-rule:nonzero;stroke:none" /><path
+                     d="m 192,96 48,0 0,48 -48,0 0,-48 z"
+                     inkscape:connector-curvature="0"
+                     id="path56"
+                     style="fill:#99ff99;fill-opacity:1;fill-rule:nonzero;stroke:none" /><path
+                     d="m 192,48 48,0 0,48 -48,0 0,-48 z"
+                     inkscape:connector-curvature="0"
+                     id="path58"
+                     style="fill:#99ff99;fill-opacity:1;fill-rule:nonzero;stroke:none" /><path
+                     d="m 240,192 48,0 0,48 -48,0 0,-48 z"
+                     inkscape:connector-curvature="0"
+                     id="path60"
+                     style="fill:#99ff99;fill-opacity:1;fill-rule:nonzero;stroke:none" /><path
+                     d="m 240,144 48,0 0,48 -48,0 0,-48 z"
+                     inkscape:connector-curvature="0"
+                     id="path62"
+                     style="fill:#99ff99;fill-opacity:1;fill-rule:nonzero;stroke:none" /><path
+                     d="m 240,96 48,0 0,48 -48,0 0,-48 z"
+                     inkscape:connector-curvature="0"
+                     id="path64"
+                     style="fill:#99ff99;fill-opacity:1;fill-rule:nonzero;stroke:none" /><path
+                     d="m 240,48 48,0 0,48 -48,0 0,-48 z"
+                     inkscape:connector-curvature="0"
+                     id="path66"
+                     style="fill:#99ff99;fill-opacity:1;fill-rule:nonzero;stroke:none" /><path
+                     d="m 288,192 48,0 0,48 -48,0 0,-48 z"
+                     inkscape:connector-curvature="0"
+                     id="path68"
+                     style="fill:#99ff99;fill-opacity:1;fill-rule:nonzero;stroke:none" /><path
+                     d="m 288,144 48,0 0,48 -48,0 0,-48 z"
+                     inkscape:connector-curvature="0"
+                     id="path70"
+                     style="fill:#99ff99;fill-opacity:1;fill-rule:nonzero;stroke:none" /><path
+                     d="m 288,96 48,0 0,48 -48,0 0,-48 z"
+                     inkscape:connector-curvature="0"
+                     id="path72"
+                     style="fill:#99ff99;fill-opacity:1;fill-rule:nonzero;stroke:none" /><path
+                     d="m 288,48 48,0 0,48 -48,0 0,-48 z"
+                     inkscape:connector-curvature="0"
+                     id="path74"
+                     style="fill:#99ff99;fill-opacity:1;fill-rule:nonzero;stroke:none" /><path
+                     d="m 336,192 48,0 0,48 -48,0 0,-48 z"
+                     inkscape:connector-curvature="0"
+                     id="path76"
+                     style="fill:#99ff99;fill-opacity:1;fill-rule:nonzero;stroke:none" /><path
+                     d="m 336,144 48,0 0,48 -48,0 0,-48 z"
+                     inkscape:connector-curvature="0"
+                     id="path78"
+                     style="fill:#99ff99;fill-opacity:1;fill-rule:nonzero;stroke:none" /><path
+                     d="m 336,96 48,0 0,48 -48,0 0,-48 z"
+                     inkscape:connector-curvature="0"
+                     id="path80"
+                     style="fill:#99ff99;fill-opacity:1;fill-rule:nonzero;stroke:none" /><path
+                     d="m 336,48 48,0 0,48 -48,0 0,-48 z"
+                     inkscape:connector-curvature="0"
+                     id="path82"
+                     style="fill:#99ff99;fill-opacity:1;fill-rule:nonzero;stroke:none" /><path
+                     d="m 384,192 48,0 0,48 -48,0 0,-48 z"
+                     inkscape:connector-curvature="0"
+                     id="path84"
+                     style="fill:#99ff99;fill-opacity:1;fill-rule:nonzero;stroke:none" /><path
+                     d="m 384,144 48,0 0,48 -48,0 0,-48 z"
+                     inkscape:connector-curvature="0"
+                     id="path86"
+                     style="fill:#99ff99;fill-opacity:1;fill-rule:nonzero;stroke:none" /><path
+                     d="m 384,96 48,0 0,48 -48,0 0,-48 z"
+                     inkscape:connector-curvature="0"
+                     id="path88"
+                     style="fill:#99ff99;fill-opacity:1;fill-rule:nonzero;stroke:none" /><path
+                     d="m 384,48 48,0 0,48 -48,0 0,-48 z"
+                     inkscape:connector-curvature="0"
+                     id="path90"
+                     style="fill:#99ff99;fill-opacity:1;fill-rule:nonzero;stroke:none" /><path
+                     d="m 432,192 48,0 0,48 -48,0 0,-48 z"
+                     inkscape:connector-curvature="0"
+                     id="path92"
+                     style="fill:#99ff99;fill-opacity:1;fill-rule:nonzero;stroke:none" /><path
+                     d="m 432,144 48,0 0,48 -48,0 0,-48 z"
+                     inkscape:connector-curvature="0"
+                     id="path94"
+                     style="fill:#99ff99;fill-opacity:1;fill-rule:nonzero;stroke:none" /><path
+                     d="m 432,96 48,0 0,48 -48,0 0,-48 z"
+                     inkscape:connector-curvature="0"
+                     id="path96"
+                     style="fill:#99ff99;fill-opacity:1;fill-rule:nonzero;stroke:none" /><path
+                     d="m 432,48 48,0 0,48 -48,0 0,-48 z"
+                     inkscape:connector-curvature="0"
+                     id="path98"
+                     style="fill:#99ff99;fill-opacity:1;fill-rule:nonzero;stroke:none" /><g
+                     transform="translate(0,293.5293)"
+                     id="g100"><text
+                       transform="matrix(1,0,0,-1,108.1001,-72.0386)"
+                       id="text102"><tspan
+                         x="0 3.8744552 8.8557549 14.940911 19.922211"
+                         y="0"
+                         id="tspan104"
+                         style="font-size:9.96259975px;font-variant:normal;font-weight:normal;writing-mode:lr-tb;fill:#000000;fill-opacity:1;fill-rule:nonzero;stroke:none;font-family:CMR10;-inkscape-font-specification:CMR10">(2,1)</tspan></text>
+<g
+                       transform="translate(0,-293.5293)"
+                       id="g106"><path
+                         d="m 120,216 0,0"
+                         inkscape:connector-curvature="0"
+                         id="path108"
+                         style="fill:none;stroke:#000000;stroke-width:3;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:10;stroke-opacity:1;stroke-dasharray:none" /><g
+                         transform="translate(0,293.5293)"
+                         id="g110"><text
+                           transform="matrix(1,0,0,-1,444.1001,-216.0386)"
+                           id="text112"><tspan
+                             x="0 3.8744552 8.8557549 14.940911 19.922211"
+                             y="0"
+                             id="tspan114"
+                             style="font-size:9.96259975px;font-variant:normal;font-weight:normal;writing-mode:lr-tb;fill:#000000;fill-opacity:1;fill-rule:nonzero;stroke:none;font-family:CMR10;-inkscape-font-specification:CMR10">(9,4)</tspan></text>
+<g
+                           transform="translate(0,-293.5293)"
+                           id="g116"><path
+                             d="m 456,72 0,0"
+                             inkscape:connector-curvature="0"
+                             id="path118"
+                             style="fill:none;stroke:#000000;stroke-width:3;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:10;stroke-opacity:1;stroke-dasharray:none" /><path
+                             d="M 0,0 528,0"
+                             inkscape:connector-curvature="0"
+                             id="path120"
+                             style="fill:none;stroke:#000000;stroke-width:0.5;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:10;stroke-opacity:1;stroke-dasharray:none" /><path
+                             d="m 0,48 528,0"
+                             inkscape:connector-curvature="0"
+                             id="path122"
+                             style="fill:none;stroke:#000000;stroke-width:0.5;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:10;stroke-opacity:1;stroke-dasharray:none" /><path
+                             d="m 0,96 528,0"
+                             inkscape:connector-curvature="0"
+                             id="path124"
+                             style="fill:none;stroke:#000000;stroke-width:0.5;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:10;stroke-opacity:1;stroke-dasharray:none" /><path
+                             d="m 0,144 528,0"
+                             inkscape:connector-curvature="0"
+                             id="path126"
+                             style="fill:none;stroke:#000000;stroke-width:0.5;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:10;stroke-opacity:1;stroke-dasharray:none" /><path
+                             d="m 0,192 528,0"
+                             inkscape:connector-curvature="0"
+                             id="path128"
+                             style="fill:none;stroke:#000000;stroke-width:0.5;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:10;stroke-opacity:1;stroke-dasharray:none" /><path
+                             d="m 0,240 528,0"
+                             inkscape:connector-curvature="0"
+                             id="path130"
+                             style="fill:none;stroke:#000000;stroke-width:0.5;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:10;stroke-opacity:1;stroke-dasharray:none" /><path
+                             d="m 0,288 528,0"
+                             inkscape:connector-curvature="0"
+                             id="path132"
+                             style="fill:none;stroke:#000000;stroke-width:0.5;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:10;stroke-opacity:1;stroke-dasharray:none" /><path
+                             d="M 0,0 0,288"
+                             inkscape:connector-curvature="0"
+                             id="path134"
+                             style="fill:none;stroke:#000000;stroke-width:0.5;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:10;stroke-opacity:1;stroke-dasharray:none" /><path
+                             d="m 48,0 0,288"
+                             inkscape:connector-curvature="0"
+                             id="path136"
+                             style="fill:none;stroke:#000000;stroke-width:0.5;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:10;stroke-opacity:1;stroke-dasharray:none" /><path
+                             d="m 96,0 0,288"
+                             inkscape:connector-curvature="0"
+                             id="path138"
+                             style="fill:none;stroke:#000000;stroke-width:0.5;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:10;stroke-opacity:1;stroke-dasharray:none" /><path
+                             d="m 144,0 0,288"
+                             inkscape:connector-curvature="0"
+                             id="path140"
+                             style="fill:none;stroke:#000000;stroke-width:0.5;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:10;stroke-opacity:1;stroke-dasharray:none" /><path
+                             d="m 192,0 0,288"
+                             inkscape:connector-curvature="0"
+                             id="path142"
+                             style="fill:none;stroke:#000000;stroke-width:0.5;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:10;stroke-opacity:1;stroke-dasharray:none" /><path
+                             d="m 240,0 0,288"
+                             inkscape:connector-curvature="0"
+                             id="path144"
+                             style="fill:none;stroke:#000000;stroke-width:0.5;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:10;stroke-opacity:1;stroke-dasharray:none" /><path
+                             d="m 288,0 0,288"
+                             inkscape:connector-curvature="0"
+                             id="path146"
+                             style="fill:none;stroke:#000000;stroke-width:0.5;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:10;stroke-opacity:1;stroke-dasharray:none" /><path
+                             d="m 336,0 0,288"
+                             inkscape:connector-curvature="0"
+                             id="path148"
+                             style="fill:none;stroke:#000000;stroke-width:0.5;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:10;stroke-opacity:1;stroke-dasharray:none" /><path
+                             d="m 384,0 0,288"
+                             inkscape:connector-curvature="0"
+                             id="path150"
+                             style="fill:none;stroke:#000000;stroke-width:0.5;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:10;stroke-opacity:1;stroke-dasharray:none" /><path
+                             d="m 432,0 0,288"
+                             inkscape:connector-curvature="0"
+                             id="path152"
+                             style="fill:none;stroke:#000000;stroke-width:0.5;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:10;stroke-opacity:1;stroke-dasharray:none" /><path
+                             d="m 480,0 0,288"
+                             inkscape:connector-curvature="0"
+                             id="path154"
+                             style="fill:none;stroke:#000000;stroke-width:0.5;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:10;stroke-opacity:1;stroke-dasharray:none" /><path
+                             d="m 528,0 0,288"
+                             inkscape:connector-curvature="0"
+                             id="path156"
+                             style="fill:none;stroke:#000000;stroke-width:0.5;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:10;stroke-opacity:1;stroke-dasharray:none" /><path
+                             d="M 0,288 0,0"
+                             inkscape:connector-curvature="0"
+                             id="path158"
+                             style="fill:none;stroke:#000000;stroke-width:4;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:10;stroke-opacity:1;stroke-dasharray:none" /><path
+                             d="M -1.5304,3.6946 0,0 l 1.5304,3.6946 -3.0608,0 z"
+                             inkscape:connector-curvature="0"
+                             id="path160"
+                             style="fill:#000000;fill-opacity:1;fill-rule:nonzero;stroke:#000000;stroke-width:4;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:10;stroke-opacity:1;stroke-dasharray:none" /><path
+                             d="M 0,0 528,0"
+                             inkscape:connector-curvature="0"
+                             id="path162"
+                             style="fill:none;stroke:#000000;stroke-width:2;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:10;stroke-opacity:1;stroke-dasharray:none" /><path
+                             d="m 528,0 0,288"
+                             inkscape:connector-curvature="0"
+                             id="path164"
+                             style="fill:none;stroke:#000000;stroke-width:2;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:10;stroke-opacity:1;stroke-dasharray:none" /><path
+                             d="m 0,288 528,0"
+                             inkscape:connector-curvature="0"
+                             id="path166"
+                             style="fill:none;stroke:#000000;stroke-width:4;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:10;stroke-opacity:1;stroke-dasharray:none" /><path
+                             d="M 524.30812,286.47073 528,288 l -3.69188,1.52927 0,-3.05854 z"
+                             inkscape:connector-curvature="0"
+                             id="path168"
+                             style="fill:#000000;fill-opacity:1;fill-rule:nonzero;stroke:#000000;stroke-width:4;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:10;stroke-opacity:1;stroke-dasharray:none" /><g
+                             transform="translate(0,293.5293)"
+                             id="g170" /></g></g></g></g></g></g></g></g></g></g></g></g></svg>
 No newline at end of file
diff --git a/doc/coordinates.mp b/doc/coordinates.mp
index 404ff70..c048e6e 100644
--- a/doc/coordinates.mp
+++ b/doc/coordinates.mp
@@ -1,14 +1,5 @@
-%
-% Compile to svg by:
-%
-% mptopdf coordinates.mp; inkscape -l coordinates-1.svg coordinates-1.pdf
-%
-beginfig(1)
+def draw_grid = 
    % Draw grid
-	u := 48;
-	w := 9;
-	h := 7;
-
    for i=0 upto h:
    	draw (0, i * u) -- (w * u, i * u);
    endfor
@@ -29,12 +20,62 @@ beginfig(1)
    draw A -- B withpen pencircle scaled 2;
    draw B -- C withpen pencircle scaled 2;
    drawarrow D -- C withpen pencircle scaled 4;
+enddef;
+
+vardef pixel_coord(expr x, y) = 
+	px := u/2 + x * u;
+	py := h * u - u/2 - u * y;
+	(px,py)
+enddef;
+
+def fill_pixel(expr x, y, col) =
+	fill unitsquare scaled u shifted pixel_coord(x - 0.5, y + 0.5) withcolor col
+enddef;
+
+beginfig(1)
+	u = 48;
+	w = 11;
+	h = 6;
+	
+	% Draw labels
+	dotlabel.top(btex (0, 0) etex, pixel_coord(0, 0));
+	dotlabel.top(btex (w-1, h-1) etex, pixel_coord(w-1, h-1));
+	dotlabel.urt(btex (1.5, 2) etex, pixel_coord(1.5, 2));
+	
+	% Draw line
+	lxs = 5;
+	lxe = 9;
+	ly = 3;
+	for i = lxs upto lxe:
+		fill_pixel(i, ly, (0.6, 0.6, 1));
+	endfor
+
+	dotlabel.top(btex (5, 3) etex, pixel_coord(lxs, ly));
+	dotlabel.top(btex (9, 3) etex, pixel_coord(lxe, ly));
+	
+	draw_grid;
+endfig;
+
+beginfig(2)
+	u := 48;
+	w := 11;
+	h := 6;
+	
    % Draw labels
-	dotlabel.top(btex (0, 0) etex, (u/2, h * u - u/2));
-	dotlabel.top(btex (w-1, h-1) etex, (w * u - u/2, u/2));
+	dotlabel.top(btex (0, 0) etex, pixel_coord(0, 0));
    
-	dotlabel.urt(btex (1.5, 2) etex, (2 * u, h * u - 2 * u - u/2));
+	for i = 2 upto 9:
+		for j = 1 upto 4:
+			fill_pixel(i, j, (0.6, 1, 0.6));
+		endfor
+	endfor
+	% Draw rectangle
+	dotlabel.top(btex (2, 1) etex, pixel_coord(2, 1));
+	dotlabel.top(btex (9, 4) etex, pixel_coord(9, 4));
+
+	draw_grid;
 endfig;
+
 end
diff --git a/doc/gen_mp.sh b/doc/gen_mp.sh
new file mode 100755
index 0000000..27c622c
--- /dev/null
+++ b/doc/gen_mp.sh
@@ -0,0 +1,20 @@
+#!/bin/sh
+#
+# Script to regenerate svgs from metapost
+#
+# The resulting svg images are stored in git so you need
+# to run the script only after you changed the metapost
+# source files.
+#
+
+SRC=coordinates
+
+echo "$SRC.mp -> $SRC-*.pdf"
+mptopdf "$SRC.mp"
+
+for i in $SRC*.pdf; do
+	SVG=`echo "$i" | sed s/.pdf/.svg/`
+	echo "$i -> $SVG" 
+	inkscape -l "$SVG" "$i"
+	rm "$i"
+done
-----------------------------------------------------------------------
Summary of changes:
 doc/coordinate_system.txt |   31 ++++-
 doc/coordinates-1.svg     |  320 ++++++++++++++++++++++++++-------------------
 doc/coordinates-2.svg     |  308 +++++++++++++++++++++++++++++++++++++++++++
 doc/coordinates.mp        |   67 ++++++++--
 doc/gen_mp.sh             |   20 +++
 5 files changed, 594 insertions(+), 152 deletions(-)
 create mode 100644 doc/coordinates-2.svg
 create mode 100755 doc/gen_mp.sh
repo.or.cz automatic notification. Contact project admin jiri.bluebear.dluhos@gmail.com
if you want to unsubscribe, or site admin admin@repo.or.cz if you receive
no reply.
-- 
gfxprim.git ("A simple 2D graphics library with emphasis on correctness and well-defined operation.")

    