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Creating Animated Apps： Canvas與ImageSprite 靜宜大學資管系 楊子青
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2.3 ImageSprite的Heading與Speed屬性
indicates the direction in which the ImageSprite should move, in degrees. For example, 0 means due right, 90 means straight up, 180 means due left, and so on. Speed specifies how many pixels the ImageSprite should move whenever its Interval passes.
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不同方向對應之Heading角度值 45 90 135 180 225 270 315
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火箭發射子彈，子彈往上跑
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2.4 偵測是否遇到邊界 使用EdgeReached(number edge)事件
Event handler called when the sprite reaches an edge of the screen. The edge argument tells which edge (or corner) was reached, encoded as follows: north = 1 northeast = 2 east = 3 southeast = 4 south = -1 southwest = -2 west = -3 northwest = -4
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子彈沒打到，到達邊界則消失
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2.5 碰撞(Collided With) Shooting games, sports, and other animated apps often rely on activity occurring when two or more objects collide.
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子彈打到(碰撞)，分數加1
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