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, pywrap has been updated via 2465d9f19ff464a62ca5a8488188cf234eac2fc0 (commit) from e345fda1e7684c1869952e03d5cf6b88b8116499 (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/2465d9f19ff464a62ca5a8488188cf234eac2... commit 2465d9f19ff464a62ca5a8488188cf234eac2fc0 Author: Tomas Gavenciak <gavento@ucw.cz> Date: Sat Feb 25 00:12:09 2012 +0100 demos: cool particle pywrap demo (AA, save) Try it out! diff --git a/demos/py_simple/gravplots_AA.py b/demos/py_simple/gravplots_AA.py new file mode 100755 index 0000000..3061d0a --- /dev/null +++ b/demos/py_simple/gravplots_AA.py @@ -0,0 +1,111 @@ +#!/usr/bin/env python +import gfxprim.core as core +import gfxprim.backends as backends +import gfxprim.loaders as loaders +import gfxprim.gfx as gfx +import random +from math import sqrt + +AA = True +W = 320*2 +H = 240*2 +BPP = 24 +N = 8 # Try 5 or 42 + +# Gravity, brake factor and desired total speeds (in dir. X and total) +G = 0.1 # Adjust: 0.1 for N<20, 0.01 for N=100 +BRAKE = 0.001 +VX0 = 0.6 +V0 = 0.9 + +# Try one max and other ~50 : +MAXR = 255 +MAXG = 255 +MAXB = 255 + +# timeout in moves, -1 for none +TIMEOUT = -1 +# after timeout save to this file, None for none +SAVETO = "gravplot.png" + +class elem(object): + def __init__(self): + #self.x = random.uniform(0.0 * W, 0.6 * W) + self.x = 0 + self.y = random.uniform(0.2 * H, 0.8 * H) + self.vx = random.uniform(VX0 - 0.5, VX0 + 0.5) + self.vy = random.uniform(-0.5, 0.5) + self.r = random.randint(MAXR / 5, MAXR) + self.g = random.randint(MAXG / 5, MAXG) + self.b = random.randint(MAXB / 5, MAXB) + + def grav(self, other, t): + dx = other.x - self.x + dy = other.y - self.y + # Minimal distance is bounded + d2 = max(dx ** 2 + dy ** 2, 0.1 ** 2) + f = G / d2 + self.vx += dx * f * t + self.vy += dy * f * t + + def move(self, t): + self.x += self.vx * t + self.y += self.vy * t + # "Gravity" to y=H/2 + if self.y > 0.6 * H: + self.vy -= V0 * t * BRAKE + if self.y < 0.4 * H: + self.vy += V0 * t * BRAKE + # Magic to adjust speed + v = sqrt(self.vx ** 2 + self.vy ** 2) + self.vx *= (1.0 - BRAKE) + (BRAKE * V0 / v) + self.vy *= (1.0 - BRAKE) + (BRAKE * V0 / v) + self.vx = (1.0 - BRAKE) * self.vx + BRAKE * VX0 + # Bound speed + self.vx = max(min(self.vx, 4.0), -4.0) + self.vy = max(min(self.vy, 4.0), -4.0) + + +def main(): + bk = backends.BackendSDLInit(W, H, BPP, 0) + assert bk + print bk + print "Modify source for parameters," + print "Kill to terminate ;-)" + black = bk.context.RGBToPixel(0, 0, 0) + + es = [elem() for i in range(N)] + while True: + for e in es: + for e2 in es: + if not (e is e2): + e.grav(e2, 1.0) + for e in es: + e.move(1.0) + if AA: + x = int((e.x % W) * 0x100) + y = int(e.y * 0x100) + if e.vx > 0.2: + gfx.VLineAA(bk.context, x + 0x100, y - 0x300, y + 0x300, black) + if e.vx < -0.2: + gfx.VLineAA(bk.context, x - 0x100, y - 0x300, y + 0x300, black) + gfx.PutPixelAA(bk.context, x, y, bk.context.RGBToPixel(e.r, e.g, e.b)) + else: + x = int(e.x % W) + y = int(e.y) + if e.vx > 0.2: + gfx.VLine(bk.context, x + 1, y - 2, y + 2, black) + if e.vx < -0.2: + gfx.VLine(bk.context, x - 1, y - 2, y + 2, black) + core.PutPixel(bk.context, x, y, bk.context.RGBToPixel(e.r, e.g, e.b)) + bk.Flip() + global TIMEOUT + if TIMEOUT > 0: + TIMEOUT -= 1 + if TIMEOUT == 0: + break + if SAVETO: + bk.context.Save(SAVETO) + +if __name__ == '__main__': + main() ----------------------------------------------------------------------- Summary of changes: demos/py_simple/gravplots_AA.py | 111 +++++++++++++++++++++++++++++++++++++++ 1 files changed, 111 insertions(+), 0 deletions(-) create mode 100755 demos/py_simple/gravplots_AA.py 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.")