Source code for pymunk.pyglet_util

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"""This submodule contains helper functions to help with quick prototyping 
using pymunk together with pyglet.

Intended to help with debugging and prototyping, not for actual production use
in a full application. The methods contained in this module is opinionated 
about your coordinate system and not very optimized (they use batched 
drawing, but there is probably room for optimizations still). 
"""

__version__ = "$Id$"
__docformat__ = "reStructuredText"

__all__ = ["draw"]


import math

import pyglet

import pymunk
from pymunk.vec2d import Vec2d

[docs]def draw(*objs, **kwargs): """Draw one or many pymunk objects. It is perfectly fine to pass in a whole Space object. Objects that can be handled are: * pymunk.Space * pymunk.Segment * pymunk.Circle * pymunk.Poly If a Space is passed in all shapes in that space will be drawn. Unrecognized objects will be ignored (for example if you pass in a constraint). Typical usage:: >>> pymunk.pyglet_util.draw(my_space) You can control the color of a Shape by setting shape.color to the color you want it drawn in. >>> my_shape.color = (255, 0, 0) # will draw my_shape in red If you do not want a shape to be drawn, set shape.ignore_draw to True. >>> my_shape.ignore_draw = True (However, if you want to ignore most shapes its probably more performant to only pass in those shapes that you want to be drawn to the draw method) You can optionally pass in a batch to use. Just remember that you need to call draw yourself. >>> pymunk.pyglet_util.draw(my_shape, batch = my_batch) >>> my_batch.draw() See pyglet_util.demo.py for a full example :Param: objs : One or many objects to draw. Can be either a single object or a list like container with objects. kwargs : You can optionally pass in a pyglet.graphics.Batch If a batch is given all drawing will use this batch to draw on. If no batch is given a a new batch will be used for the drawing. Remember that if you pass in your own batch you need to call draw on it yourself. """ new_batch = False if "batch" not in kwargs: new_batch = True batch = pyglet.graphics.Batch() else: batch = kwargs["batch"] for o in objs: if isinstance(o, pymunk.Space): _draw_space(o, batch) elif isinstance(o, pymunk.Shape): _draw_shape(o, batch) elif isinstance(o, pymunk.Constraint): _draw_constraint(o, batch) elif hasattr(o, '__iter__'): for oo in o: draw(oo, **kwargs) if new_batch: batch.draw()
def _draw_space(space, batch = None): for s in space.shapes: if not (hasattr(s, "ignore_draw") and s.ignore_draw): _draw_shape(s, batch) def _draw_shape(shape, batch = None): if isinstance(shape, pymunk.Circle): _draw_circle(shape, batch) elif isinstance(shape, pymunk.Segment): _draw_segment(shape, batch) elif isinstance(shape, pymunk.Poly): _draw_poly(shape, batch) def _draw_circle(circle, batch = None): circle_center = circle.body.position + circle.offset.rotated(circle.body.angle) r = 0 if hasattr(circle, "color"): color = circle.color elif circle.body.is_static: color = (200, 200, 200) r = 1 else: color = (255, 0, 0) #http://slabode.exofire.net/circle_draw.shtml num_segments = int(4 * math.sqrt(circle.radius)) theta = 2 * math.pi / num_segments c = math.cos(theta) s = math.sin(theta) x = circle.radius # we start at angle 0 y = 0 ps = [] for i in range(num_segments): ps += [Vec2d(circle_center.x + x, circle_center.y + y)] t = x x = c * x - s * y y = s * t + c * y if circle.body.is_static: mode = pyglet.gl.GL_LINES ps = [p for p in ps+ps[:1] for _ in (0, 1)] else: mode = pyglet.gl.GL_TRIANGLE_STRIP ps2 = [ps[0]] for i in range(1, len(ps)+1/2): ps2.append(ps[i]) ps2.append(ps[-i]) ps = ps2 vs = [] for p in [ps[0]] + ps + [ps[-1]]: vs += [p.x, p.y] c = circle_center + Vec2d(circle.radius, 0).rotated(circle.body.angle) cvs = [circle_center.x, circle_center.y, c.x, c.y] bg = pyglet.graphics.OrderedGroup(0) fg = pyglet.graphics.OrderedGroup(1) l = len(vs)/2 if batch == None: pyglet.graphics.draw(l, mode, ('v2f', vs), ('c3B', color*l)) pyglet.graphics.draw(2, pyglet.gl.GL_LINES, ('v2f', cvs), ('c3B', (0,0,255)*2)) else: batch.add(len(vs)/2, mode, bg, ('v2f', vs), ('c3B', color*l)) batch.add(2, pyglet.gl.GL_LINES, fg, ('v2f', cvs), ('c3B', (0,0,255)*2)) return def _draw_poly(poly, batch = None): ps = poly.get_vertices() if hasattr(poly, "color"): color = poly.color elif poly.body.is_static: color = (200, 200, 200) else: color = (0, 255, 0) if poly.body.is_static: mode = pyglet.gl.GL_LINES ps = [p for p in ps+ps[:1] for _ in (0, 1)] else: mode = pyglet.gl.GL_TRIANGLE_STRIP ps = [ps[1],ps[2], ps[0]] + ps[3:] vs = [] for p in [ps[0]] + ps + [ps[-1]]: vs += [p.x, p.y] l = len(vs)/2 if batch == None: pyglet.graphics.draw(l, mode, ('v2f', vs), ('c3B', color*l)) else: batch.add(l, mode, None, ('v2f', vs), ('c3B', color*l)) def _draw_segment(segment, batch = None): body = segment.body pv1 = body.position + segment.a.rotated(body.angle) pv2 = body.position + segment.b.rotated(body.angle) d = pv2 - pv1 a = -math.atan2(d.x, d.y) dx = segment.radius * math.cos(a) dy = segment.radius * math.sin(a) p1 = pv1 + Vec2d(dx,dy) p2 = pv1 - Vec2d(dx,dy) p3 = pv2 + Vec2d(dx,dy) p4 = pv2 - Vec2d(dx,dy) vs = [i for xy in [p1,p2,p3]+[p2,p3,p4] for i in xy] if hasattr(segment, "color"): color = segment.color elif segment.body.is_static: color = (200, 200, 200) else: color = (0, 0, 255) l = len(vs)/2 if batch == None: pyglet.graphics.draw(l, pyglet.gl.GL_TRIANGLES, ('v2f', vs), ('c3B', color * l)) else: batch.add(l,pyglet.gl.GL_TRIANGLES, None, ('v2f', vs), ('c3B', color * l))

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