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commit f204dcfe752e123a63561b343553d0defc555bc5 Author: Cyril Hrubis metan@ucw.cz Date: Sat Feb 25 19:41:04 2012 +0100

demos: Simple python function plotter.

diff --git a/demos/py_simple/plot.py b/demos/py_simple/plot.py new file mode 100755 index 0000000..96ce3e3 --- /dev/null +++ b/demos/py_simple/plot.py @@ -0,0 +1,85 @@ +#!/usr/bin/env python +import gfxprim.core as core +import gfxprim.backends as backends +import gfxprim.gfx as gfx +import sys +from math import * + +W = 640 +H = 480 +EPS = 0.05 + +env = {} +env['sin'] = sin +env['cos'] = cos +env['sqrt'] = sqrt + +def compute(func, x, y_min, y_max): + env['x'] = x + try: + ret = eval(func, env) + except ZeroDivisionError, d: + return -1 + + return - H * ret / (y_max - y_min) + (H * y_max) / (y_max - y_min) + +def x_to_x(x, x_min, x_max): + return (x_max - x_min) * x / W + x_min + +class plotter(object): + def __init__(self, func, x_min, x_max, y_min, y_max): + self.x = 0.0 + self.y = compute(func, x_to_x(self.x, x_min, x_max), y_min, y_max) + self.y_min = y_min + self.y_max = y_max + self.x_min = x_min + self.x_max = x_max + self.func = func + def next(self): + x = x_to_x(self.x + 1, self.x_min, self.x_max) + new_y = compute(self.func, x, self.y_min, self.y_max) + + inc = 1.0 + + while (abs(new_y - self.y) > 1 and inc > EPS): + x = x_to_x(self.x + inc, self.x_min, self.x_max) + new_y = compute(self.func, x, self.y_min, self.y_max) + inc /= 2 + + self.x += inc + self.y = new_y + + print self.x, self.y + + +def main(): + bk = backends.BackendSDLInit(W, H, 0, 0, "Plot AA") + assert bk + print bk + print "Modify source for parameters," + print "Kill to terminate ;-)" + print "Usage: function x_min x_max y_min y_max" + black = bk.context.RGBToPixel(0, 0, 0) + + x_min = float(sys.argv[2]) + x_max = float(sys.argv[3]) + y_min = float(sys.argv[4]) + y_max = float(sys.argv[5]) + p = plotter(sys.argv[1], x_min, x_max, y_min, y_max) + + r = 255 + g = 0 + b = 0 + + while p.x < W: + x = int((p.x + 0.5) * 0x100) + y = int((p.y + 0.5) * 0x100) + gfx.PutPixelAA(bk.context, x, y, bk.context.RGBToPixel(int(r), int(g), int(b))) + bk.Flip() + p.next() + + while True: + pass + +if __name__ == '__main__': + main()

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Summary of changes: demos/py_simple/plot.py | 85 +++++++++++++++++++++++++++++++++++++++++++++++ 1 files changed, 85 insertions(+), 0 deletions(-) create mode 100755 demos/py_simple/plot.py

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