Created
January 16, 2020 15:00
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def draw_square(cx, cy, r, l, theta): | |
pushMatrix() | |
quarter_turns, theta = divmod(theta, HALF_PI) | |
translate(cx, cy) | |
rotate(quarter_turns * HALF_PI) | |
critical_theta = atan(l * 1.0 / (2 * r + l)) | |
if theta <= critical_theta: | |
x = r + l / 2.0 | |
y = (r + l / 2.0) * tan(theta) | |
elif theta >= HALF_PI - critical_theta: | |
x = (r + l / 2.0) / tan(theta) | |
y = r + l / 2.0 | |
else: | |
a = 1 | |
b = -l * (cos(theta) + sin(theta)) | |
c = l ** 2 / 2.0 - r ** 2 | |
R = (-b + sqrt(b ** 2 - 4 * a * c)) / (2 * a) | |
x = R * cos(theta) | |
y = R * sin(theta) | |
rect(x, y, l, l) | |
line(0, 0, x, y) | |
popMatrix() | |
def setup(): | |
global theta | |
size(800, 800) | |
theta = 0.0 | |
THETA_RATE = 0.01 | |
def draw(): | |
global theta | |
theta += THETA_RATE | |
background(0) | |
stroke(255) | |
noFill() | |
ellipseMode(RADIUS) | |
rectMode(CENTER) | |
ellipse(400, 400, 200, 200) | |
draw_square(400, 400, 200, 100, theta) |
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