java - 动画 3 对象

Question

我需要绘制一个矩形、圆形和线条，然后为它们设置动画（例如按左->它（所有对象）向左移动。）

我画这样的物体

class MyCanvas extends JComponent {

int x = 10;
int y = 10;
public MyCanvas()
{
    Action someaction = new AbstractAction(){
        @Override
        public void actionPerformed(ActionEvent e) {
            x+=30;
            //revalidate();
            repaint();
        }
    };
    this.getInputMap().put(KeyStroke.getKeyStroke("SPACE"), someaction);
}        
@Override
public void paintComponent(Graphics g) {
g.drawRect(x,y, 200, 200); 
g.drawOval(x, y, 50, 50);
g.drawLine(x, y, 50, 30);
  }
}

但它不动。

Answer 1

1. 用于paintComponent(Graphics g)SwingJComponents而不是paint(Graphics g)

2. 用于 Swing KeyBindings_KeyEventsJComponents

3. 将对象（之前准备paintComponent(Graphics g)）放入数组，从数组中绘制元素paintComponent(Graphics g)