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renderer.py
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renderer.py
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import math
import pymunk as cymunk
from pymunk import Vec2d
from kivy.graphics import Color, Ellipse, Rectangle, Rotate, Line, Triangle
from kivy.properties import DictProperty, ListProperty
from utils import random_color as get_rand_color
from utils import distance, calc_center
FRICTION = 0.5
PIN_RADIUS = 4
from tools import LINE_WIDTH
CIRCLE_TYPE = 1
RECT_TYPE = 2
TRIANGLE_TYPE = 3
class Renderer:
space_bounds = []
bound_rects = []
def __init__(self, parent):
self.parent = parent
self.joints_drawn = {}
def init_physics(self):
self.space = space = cymunk.Space()
space.iterations = 30
space.gravity = (0, -700)
space.sleep_time_threshold = 0.5
space.collision_slop = 0.5
# create 4 segments that will act as a bounds
for x in range(2):
seg = cymunk.Segment(space.static_body,
Vec2d(0, 0), Vec2d(0, 0), 10.0)
seg.elasticity = 0.6
#seg.friction = 1.0
self.space_bounds.append(seg)
space.add(seg)
# update bounds with good positions
self.update_bounds()
def update_bounds(self, new=False, *largs):
assert(len(self.space_bounds) == 2)
a, b = self.space_bounds
x0, y0 = self.parent.pos
x1 = self.parent.right
y1 = self.parent.top
space = self.space
self.space.remove(a)
self.space.remove(b)
a = cymunk.Segment(space.static_body,
Vec2d(x0, y0), Vec2d(x1, y0), 10.0)
b = cymunk.Segment(space.static_body,
Vec2d(x1, y1), Vec2d(x0, y1), 10.0)
self.space.add(a)
self.space.add(b)
self.space_bounds = [a, b]
for x in self.space_bounds:
x.friction = FRICTION
def update_objects(self):
for body in self.space.bodies:
data = body.data
# print body
p = body.position
if data["type"]==CIRCLE_TYPE:
rad = data["radius"]
canvas_instruction, rot, unrot = data["instruction"]
rot.angle = math.degrees(body.angle)
rot.origin = p.x, p.y
canvas_instruction.pos = p.x-rad, p.y-rad
canvas_instruction.size = rad*2, rad*2
unrot.angle = -math.degrees(body.angle)
unrot.origin = p.x, p.y
elif data["type"]==RECT_TYPE:
rect, rotater, unrotater = data["instruction"]
size = data["size"]
rotater.angle = math.degrees(body.angle)
rotater.origin = p.x, p.y
rect.pos = p.x-(size[0]/2), p.y-(size[1]/2)
rect.size = size
unrotater.angle = -math.degrees(body.angle)
unrotater.origin = p.x, p.y
elif data["type"]==TRIANGLE_TYPE:
rect, rotater, unrotater = data["instruction"]
vertices = data["shapes"][0].get_vertices()
center = cymunk.util.calc_center(vertices)
# print
# print center
# print (p.x, p.y)
rotater.angle = math.degrees(body.angle)
rotater.origin = p.x, p.y
points2 = []
for t in vertices:
points2.extend([t.x, t.y])
rect.points = points2
unrotater.angle = -math.degrees(body.angle)
unrotater.origin = p.x, p.y
else: print(body)
for joint in self.space.constraints:
# print joint.anchr1, joint.anchr2
if isinstance(joint, cymunk.constraint.PivotJoint):
pos = joint.anchr2.x-PIN_RADIUS,\
joint.anchr2.y-PIN_RADIUS
if joint in self.joints_drawn:
self.joints_drawn[joint].pos = pos
else:
with self.parent.canvas:
Color(*get_rand_color(), mode="rgba")
self.joints_drawn[joint] = Ellipse(
pos=pos,
size=(2*PIN_RADIUS, 2*PIN_RADIUS))
elif isinstance(joint, cymunk.constraint.SimpleMotor):
pass
else:
p1 = joint.a.position + joint.anchr1.rotated(joint.a.angle)
p2 = joint.b.position + joint.anchr2.rotated(joint.b.angle)
lpoints = [p1.x, p1.y, p2.x, p2.y]
if joint in self.joints_drawn:
self.joints_drawn[joint].points = lpoints
else:
with self.parent.canvas:
Color(*joint.color, mode="rgba")
self.joints_drawn[joint] = \
Line(points=lpoints,
width=LINE_WIDTH)
def add_circle(self, x, y, radius, random_color):
body = cymunk.Body(100, 1e5)
body.position = x, y
circle = cymunk.Circle(body, radius)
circle.elasticity = 0.6
circle.friction = FRICTION/2
self.space.add(body, circle)
with self.parent.canvas.before:
color = Color(*random_color, mode="rgba")
rot = Rotate(angle=0, axis=(0, 0, 1), origin=(x, y))
rect = Ellipse(
pos=(x-radius, y-radius),
size=(radius*2, radius*2))
unrot = Rotate(0, (0, 0, 1), origin=(x, y))
body.data = {
"radius": radius,
"color": color,
"instruction": [rect, rot, unrot],
"type": CIRCLE_TYPE,
"shapes": [circle]
}
def add_box(self, x, y, width, height, random_color):
body = cymunk.Body(100., cymunk.moment_for_box(100., width, height))
body.position = x, y
rect_shape = cymunk.Poly.create_box(body, size=(width, height))
rect_shape.elasticity = 0.6
rect_shape.friction = FRICTION
self.space.add(body, rect_shape)
with self.parent.canvas.before:
color = Color(*random_color, mode="rgba")
rotater = Rotate(angle=0, axis=(0, 0, 1), origin=(x, y))
rect = Rectangle(pos=(x-(width/2), y-(height/2)),
size=(width, height))
unrotater = Rotate(0, (0, 0, 1), origin=(x, y))
body.data = {
"size": (width, height),
"color": color,
"instruction": (rect, rotater, unrotater),
"type": RECT_TYPE,
"shapes": [rect_shape]
}
def add_triangle(self, vertices, random_color):
vbackup = vertices
vertices = [int(v) for v in vertices]
vertices = zip(vertices[::2], vertices[1::2])
center = cymunk.util.calc_center(vertices)
body = cymunk.Body(100,
cymunk.moment_for_poly(100, vertices))
body.position.x = center[0]
body.position.y = center[1]
triangle = cymunk.Poly(body, vertices)
triangle.elasticity = 0.6
triangle.friction = FRICTION
self.space.add(body, triangle)
with self.parent.canvas.before:
color = Color(*random_color, mode="rgba")
rot = Rotate(angle=0, axis=(0, 0, 1), origin=center)
triangle_shape = Triangle(points=vbackup)
unrot = Rotate(0, (0, 0, 1), origin=center)
body.data = {
"color": color,
"instruction": [triangle_shape, rot, unrot],
"type": TRIANGLE_TYPE,
"shapes": [triangle],
}