Improved bouncing balls demo
Keep the bouncing balls in the court and gives balls a speed in proportion to their size. Created from code in
@@ -22,28 +22,35 @@ class Ball:
# initialise shapes
balls = []
for i in range(0, 100):
+ r = random.randint(0, 10) + 3
balls.append(
Ball(
- random.randint(0, width),
- random.randint(0, height),
- random.randint(0, 10) + 3,
- random.randint(0, 255) / 128,
- random.randint(0, 255) / 128,
+ random.randint(r, r + (width - 2 * r)),
+ random.randint(r, r + (height - 2 * r)),
+ r,
+ (14 - r) / 2,
+ (14 - r) / 2,
display.create_pen(random.randint(0, 255), random.randint(0, 255), random.randint(0, 255)),
)
)
while True:
- display.set_pen(120, 40, 60)
+ display.set_pen(40, 40, 40)
display.clear()
for ball in balls:
ball.x += ball.dx
ball.y += ball.dy
- if ball.x < 0 or ball.x > width:
+ xmax = width - ball.r
+ xmin = ball.r
+ ymax = height - ball.r
+ ymin = ball.r
+
+ if ball.x < xmin or ball.x > xmax:
ball.dx *= -1
- if ball.y < 0 or ball.y > height:
+
+ if ball.y < ymin or ball.y > ymax:
ball.dy *= -1
display.set_pen(ball.pen)
