| 2 |
public class mPoint { /* Continue as before and add */
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public void setColor(Color color) { this.color = color;}
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public void checkBoundry(Rectangle rect) { /* check if object crosses boundary */
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int nx = x+dx; /* caculate new location */
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int ny = y+dy;
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if ( (nx < rect.x) || (nx >= rect.x+rect.width) ) dx = -dx;
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if ( (ny < rect.y) || (ny >= rect.y+rect.height) ) dy = -dy;
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}
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public void move(Graphics g) { /* move object */
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paint(g); /* use XOR to hide object */
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x += dx; /* update location */
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y += dy;
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paint(g); /* draw object on new location */
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}
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public void paint(Graphics g) {}
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