processing 方圆世界

• Based on Coding Challenge #50

1. 膨胀

• # 变大的圆
• r = r + 0.5
• # 触边判断
• def edges() :
•  return (x + r > width || x - r < 0 || y + r > height || y -r < 0)

2. 生成圈圈

• # total即是每帧生成圈圈的数量
• while (count < total):
•  newC = newCircle()
•   if (newC != null):
•    circles.add(newC)
•    count++
• # 圈圈的内部不生成新的圆
• for (Circle c : circles):
•  d = dist(x, y, c.x, c.y)
•   if (d < c.r):
•    valid = false
•    break
• # 对每个圆来说，一旦与其他任何一个圆距离够近，则不再膨胀
• for (Circle other : circles):
•  if (c != other):
•   d = dist(c.x, c.y, other.x, other.y)
•   if (d - 2 < c.r + other.r):
•    c.growing = false
•    break

3. 上图

• # 根据待生成圈圈的位置 获取图片上相应颜色
• int index = int(x) + int(y) * img.width
•  new Circle(x, y, img.pixels[index])
• # 生成矩形
• randomSeed(seed)
• if (random(1)>0.8):

•  rect(x, y, r*random(1, 2), r*random(1, 2))

4. 美化

• # 正片叠底，透明度渐增
• tint(255, alpha)
• image(img, 0, 0)
• if (alpha < 256):
•  alpha += (frameCount<150) ?.5 :5
• # 删除不合适的点点
• def mousePressed():
•  for (Circle c : circles):
•   d = dist(mouseX, mouseY, c.x, c.y)
•    if (d < c.r):
•     c.showing = false
•     c.growing = false
•     c.r = 0