Question

import java.awt.Graphics;
import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JPanel;
import javax.swing.Timer;



public class Panel  extends JPanel implements ActionListener   {


    Timer t = new Timer(5, this);

    public Panel(){

        t.start();
        setFocusable(true);
        setFocusTraversalKeysEnabled(false);
    }

    public void paintComponent(Graphics g){

    }

    public void actionPerformed(ActionEvent e) {
        repaint();

    }
}

我想在绘画组件之外设置我的图形的形状和大小，但我不知道如何。我已经尝试过Oval o = new Oval但它不起作用请帮助我。

Answer 1

@Jason的解决方案将起作用，但是如果你想进一步发展，你可以使用paintComponent接口进行抽象，这样你的private java.util.List<Shape> shapesToFill = new ArrayList<>(); public Panel(java.util.List<Shape> shapes) { this.shapesToFill.addAll(shapes); //... } @Override protected void paintComponent(Graphics g) { super.paintComponent(g); Graphics2D g2d = (Graphics2D) g; shapesToFill.forEach(g2d::fill); }方法就不需要知道它的绘画内容。

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Answer 2

你试过这个吗？

    Ellipse2D.Double oval = new Ellipse2D.Double(x, y, width, height);
     public void paintComponent(Graphics g)
    {
         g.fill(oval);
    }

然后你可以用g2D填写它

Answer 3

    public class Panel
        extends JPanel
        implements ActionListener {

      Timer t = new Timer(5, this);

      Oval oval = new Oval(0, 0, 50, 100);

      public void paintComponent(Graphics g) {
        g.drawOval(oval.getX(), oval.getY(), oval.getWidth(), oval.getHeight());
      }

   static class Oval {

    private int x;
    private int y;
    private int width;
    private int height;

    public Oval(int x, int y, int width, int height) {
      this.x = x;
      this.y = y;
      this.width = width;
      this.height = height;
    }

    public int getX() {
      return x;
    }

    public int getY() {
      return y;
    }

    public int getWidth() {
      return width;
    }

    public int getHeight() {
      return height;
    }
  }

java Paint组件声明paintcomponent之外的形状和大小

3 个答案: