我正在制作一个在框架中移动的弹跳立方体。为了检测框架的边界，我使用了JFrame中JComponent的getHeight（）和getWidth（）并计算了可能的边界，以便立方体可以反弹。
对于getWidth（）来说，它完全可以正常工作。但是，我无法使其在getHeight（）的边界上反弹。
当多维数据集移至窗口顶部时，它会继续前进约10个像素，然后反弹。
这是此问题的屏幕截图。
这是我的代码：
public class Cube {
final public static int DIMENSION = 100;
private final static int D_X = 20;
private final static int D_Y = -20;
private final static int SPEED = 1;
private int xVelBK;
private int yVelBK;
private int xVel;
private int yVel;
private CubePoint[] pts;
public Cube(int x, int y){
xVel = SPEED;
yVel = SPEED;
pts = new CubePoint[8];
pts[0] = new CubePoint(x,y);
pts[1] = new CubePoint(x,y - DIMENSION);
pts[2] = new CubePoint(x + DIMENSION,y - DIMENSION);
pts[3] = new CubePoint(x + DIMENSION,y);
pts[4] = new CubePoint(x + D_X,y + D_Y);
pts[5] = new CubePoint(x + D_X,y + D_Y - DIMENSION);
pts[6] = new CubePoint(x + D_X + DIMENSION,y + D_Y - DIMENSION);
pts[7] = new CubePoint(x + D_X + DIMENSION,y + D_Y);
}
public void move(int componentWidth, int componentHeight){
......
//bug in here
if (pts[0].getY() - DIMENSION - D_Y <= 0 ) {
yVel = SPEED;
}
.......
}
..........
}
这是组件：
public class CubeComponent extends JComponent {
...........
private Cube cube;
private Timer timer;
private CubePoint originMousePos;
private CubePoint closest;
private Font font;
private int mode;
private int delay = DEFAULT_DELAY ;
private int mouseToClosestX;
private int mouseToClosestY;
class CubeMoveListener implements ActionListener{
@Override
public void actionPerformed(ActionEvent e){
cube.move(getWidth(),getHeight());
repaint();
}
}
@Override
public void paintComponent(Graphics g){
Graphics2D g2 = (Graphics2D)g;
cube.draw(g2);
}
}
最佳答案
据我所知：
if (pts[0].getY() - DIMENSION - D_Y <= 0 ) {
应该用来确定多维数据集何时到达组件底部，因此您应该测试“>”
和
if ( pts[0].getY() >= componentHeight) {
当多维数据集到达顶部时，应该用于测试。因此应该是：
if ( pts[0].getY() <= 0) {
关键是：
垂直测试之一需要测试“ 水平和垂直测试的结构应该相同，只需要更改变量名称即可。