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Ball_trapeze_gif_loop.py
w, h = 1000, 800
class Ball(object):
def __init__(self,_id, _x, _y, _vx=0, _vy=0, _dir='UP'):
self.x, self.y = _x, _y
self.vx, self.vy = _vx, _vy
self.id = _id
self.dir = _dir #'UP', 'DOWN', "RIGHT", "LEFT"
self.av = 0
self.color = random(255)
def move(self):
if self.dir=='UP':
if self.y > ymin:
self.y -= self.vy
else:
self.dir = 'ARC_12_to_3'
self.av = PI
elif self.dir=='DOWN':
if self.y < ymax:
self.y += self.vy
else:
self.dir = 'ARC_6_to_9'
self.av = 0
elif self.dir=='RIGHT':
if self.x < xmax:
self.x += self.vx
else:
self.dir = 'ARC_3_to_6'
self.av = 3*PI/2
elif self.dir=='LEFT':
if self.x > xmin:
self.x -= self.vx
else:
self.dir = 'ARC_9_to_12'
self.av = 0
def display(self):
if self.dir == 'ARC_12_to_3':
self.av += theta
if self.av < 3*PI/2:
pushMatrix()
translate(xs, ye)
rotate(self.av)
fill(self.color)
ellipse(0, radius, 20, 20)
popMatrix()
else:
self.dir = 'LEFT'
self.x = xmax
self.y = ye
self.av = PI/2
elif self.dir == 'ARC_9_to_12':
self.av += theta
if self.av < PI/2:
pushMatrix()
translate(xe, ye)
rotate(self.av)
fill(self.color)
ellipse(-1*radius, 0, 20, 20)
popMatrix()
else:
self.dir = 'DOWN'
self.x = xe
self.y = ymin
elif self.dir == 'ARC_6_to_9':
self.av += theta
if self.av < PI/2:
pushMatrix()
translate(xe, ys)
rotate(self.av)
fill(self.color)
ellipse(0, radius, 20, 20)
popMatrix()
else:
self.dir = 'RIGHT'
self.x = xmin
self.y = ys
elif self.dir == 'ARC_3_to_6':
self.av += theta
if self.av < TWO_PI:
pushMatrix()
translate(xs, ys)
rotate(self.av)
fill(self.color)
ellipse(0, radius, 20, 20)
popMatrix()
else:
self.dir = 'UP'
self.x = xs
self.y = ymax
else: # Linear motion
fill(self.color)
ellipse(self.x, self.y, 20,20)
sqside = 400
num_balls = 4
vx, vy = 1, 1
xs = w/2-sqside/2
ys = h/2-sqside/2
ye = ys+sqside
xe = xs+sqside
ibd = sqside/(num_balls+1)
xmin = xs+ibd
ymin = ys+ibd
xmax = xs+ibd*num_balls
ymax = ys+ibd*num_balls
radius = sqside - ibd
theta = PI/2 * vx / ibd
balls = []
for x in range(num_balls):
balls.append(Ball(x, xmin + x*ibd,ys, vx,vy, 'RIGHT'))
balls.append(Ball(x, xmin + x*ibd,ye, vx,vy, 'LEFT'))
balls.append(Ball(x, xs, ymin +x*ibd, vx,vy, 'UP'))
balls.append(Ball(x, xe, ymin +x*ibd, vx,vy, 'DOWN'))
def setup():
size(w,h)
background(127)
smooth()
def draw():
global balls, active_balls, a
background(127)
strokeWeight(2)
noFill()
stroke(255)
square(xs,ys,sqside)
#noStroke()
for b in balls:
b.move()
b.display()
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