如何在按钮上绘画图形(如何利用paintComponent) JAVA学习资料

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如何在按钮上绘画图形(如何利用paintComponent)

时间:22/04/2007
作者：网络
来源：网络

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该组件可以任意在按钮上绘画你需要的形状(Shape），具体代码如下：

import javax.swing.*;
import java.awt.*;

public class JXButton extends JButton
{
    final public static int UP      = 0;
    final public static int DOWN    = 1;
    final public static int LEFT    = 2;
    final public static int RIGHT   = 3;

    final private static int SPACES = 3;
    private Dimension size = new Dimension(20,10);
    private int type = 0;
    public JXButton(Dimension size)
    {
        super();
        this.size = size;
        setFocusPainted(false);
        //setBorderPainted(false);
    }
    public JXButton(int type,int width,double height)
    {
        this(new Dimension(width,(int)height));
        this.type = type;
    }
    public JXButton(int width,int height)
    {
        this(new Dimension(width,height));
    }
    public JXButton(int type,int width,int height)
    {
        this(new Dimension(width,height));
        this.type = type;
    }
    public Dimension getPreferredSize()
    {
        return size;
    }
    public void setDisplay(int type)
    {
        this.type = type;
        repaint();
    }
    public void paintComponent(Graphics g)
    {
        Dimension ds = getSize();

        int x0 = -1,y0 = -1;
        int x1 = -1,y1 = -1;
        int x2 = -1,y2 = -1;

        g.clearRect(0,0,ds.width,ds.height);
        switch(type)
        {
            case UP:
                x0 = ds.width / 2      ; y0 = SPACES;
                x1 = SPACES            ; y1 = ds.height - SPACES;
                x2 = ds.width - SPACES ; y2 = ds.height - SPACES;
                break;
            case DOWN:
                x2 = 1;                ; y2 = SPACES;
                x0 = ds.width / 2      ; y0 = ds.height - SPACES;
                x1 = ds.width - SPACES ; y1 = SPACES;
                break;
            case LEFT:
                x0 = SPACES            ; y0 = ds.height / 2;
                x1 = ds.width - SPACES ; y1 = ds.height - SPACES;
                x2 = ds.width - SPACES ; y2 = SPACES;
                break;
            case RIGHT:
                x1 = SPACES            ; y1 =SPACES;
                x2 = SPACES            ; y2 = ds.height - SPACES;
                x0 = ds.width - SPACES ; y0 = ds.height / 2;
                break;
        }
        //根据三点坐标开始画三角形
        if(x1==x2 && x1>0)
        {
            //横坐标相等
            for(int i = Math.min(y1,y2);i<=Math.max(y1,y2);i++)
            {
                g.drawLine(x0,y0,x1,i);
            }
        }
        else if(y1==y2 && y1>0)
        {
            //纵坐标相等
            for(int i = Math.min(x1,x2);i<=Math.max(x1,x2);i++)
            {
                g.drawLine(x0,y0,i,y1);
            }
        }
        g.drawLine(x1,y1,x2,y2);
        //super.paintComponents(g);
    }
};

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