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当前,此代码段通过鼠标单击来移动已经绘制在框架上的当前矩形。该点击的坐标转至变量x和y。无论在框架上点击什么,矩形都会移动到该位置。我想它只是画一个新的矩形,所以例如当我在屏幕上随机点击10次时,会出现10个矩形。你怎么做到这一点?在鼠标点击上绘制每个矩形而不是setLocation
public void moveRectangleTo(int x, int y)
{
box.setLocation(x, y);
repaint();
}
全码: RectangleComponent类
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Rectangle;
import javax.swing.JComponent;
public class RectangleComponent2 extends JComponent
{
private static final int BOX_X = 100;
private static final int BOX_Y = 100;
private static final int BOX_WIDTH = 20;
private static final int BOX_HEIGHT = 30;
private Rectangle box;
public RectangleComponent2()
{
box = new Rectangle(BOX_X, BOX_Y, BOX_WIDTH, BOX_HEIGHT);
}
public void paintComponent(Graphics g)
{
Graphics2D g2 = (Graphics2D) g;
g2.draw(box);
}
public void moveRectangleTo(int x, int y)
{
box.setLocation(x, y);
repaint();
}
}
矩形框架类:
import java.awt.event.MouseListener;
import java.awt.event.MouseEvent;
import javax.swing.JFrame;
public class RectangleFrame2 extends JFrame {
private static final int FRAME_WIDTH = 300;
private static final int FRAME_HEIGHT = 400;
private RectangleComponent2 scene;
class MousePressListener implements MouseListener {
public void mousePressed(MouseEvent event) {
int x = event.getX();
int y = event.getY();
scene.moveRectangleTo(x, y);
}
public void mouseReleased(MouseEvent event) {}
public void mouseClicked(MouseEvent event) {}
public void mouseEntered(MouseEvent event) {}
public void mouseExited(MouseEvent event) {}
}
public RectangleFrame2() {
scene = new RectangleComponent2();
add(scene);
setSize(FRAME_WIDTH, FRAME_HEIGHT);
MouseListener listener = new MousePressListener();
scene.addMouseListener(listener);
}
}
你能告诉我如何在paintComponent中迭代/循环吗? – visiontech60
@ visiontech60:当然你知道如何使用for循环,不是吗? 1+的答案。还要记住提醒他在paintComponent中调用super的方法。 –
是的,但我不太舒服,使用ArrayList – visiontech60