画图板升级可选多种图形，颜色博客分类： Java基础画图板图形颜色的选择

程序员文章站 2024-03-21 20:29:34

...

/**
* 画图板的升级，可以实现图形和颜色的选择，可以以此为模版继续添加图形和颜色
*/
import java.awt.Color;
import java.awt.Graphics;

import javax.swing.*;
public class DrawUI {
    public static void main(String args[]) {
    DrawUI dr = new DrawUI();
    dr.initUI();
    }

    public void initUI() {
    JFrame jf = new JFrame("画图板");
    jf.setSize(500,600);
    jf.setResizable(false); //窗体大小不能变化
    jf.setLocation(300, 20);
    jf.setLayout(null);

    JLabel jlb = new JLabel("请选择");
    jlb.setBounds(10,420,100,30);
    jf.add(jlb);

    /**
    * 画图区域
    */
    JPanel jp = new JPanel();
    jp.setSize(500,400);
    jp.setBackground(Color.DARK_GRAY);
    jf.add(jp);

    /**
    * 图形选择
    */
    JRadioButton jrb1 = new JRadioButton("直线");
    JRadioButton jrb2 = new JRadioButton("矩形");
    JRadioButton jrb3 = new JRadioButton("圆");
    JRadioButton jrb4 = new JRadioButton("3D-rect");
    JRadioButton jrb5 = new JRadioButton("Full3DRect");
    /**
    * 设置相应图形的指令
    */
    jrb1.setActionCommand("line");
    jrb2.setActionCommand("rect");
    jrb3.setActionCommand("oval");
    jrb4.setActionCommand("3D-rect");
    jrb5.setActionCommand("Full3DRect");
    jrb1.setBounds(10, 450,70, 50);
    jrb2.setBounds(100, 450,70, 50);
    jrb3.setBounds(200, 450,70, 50);
    jrb4.setBounds(300, 450,70, 50);
    jrb5.setBounds(400, 450,90, 50);
    ButtonGroup group1 = new ButtonGroup(); //组管理，实现图形单选
    group1.add(jrb1);
    group1.add(jrb2);
    group1.add(jrb3);
    group1.add(jrb4);
    group1.add(jrb5);

     jrb1.setSelected(true); //默认选择为直线
    jf.add(jrb1);
    jf.add(jrb2);
    jf.add(jrb3);
    jf.add(jrb4);
    jf.add(jrb5);

    /**
    * 颜色选择
    */
     JRadioButton jrba = new JRadioButton("红色");
    JRadioButton jrbb = new JRadioButton("蓝色");
    JRadioButton jrbc = new JRadioButton("黑色");
        JRadioButton jrbd = new JRadioButton("黄色");
    JRadioButton jrbe = new JRadioButton("绿色");
    /**
    * 设置相颜色形的指令
    */
    jrba.setActionCommand("red");
    jrbb.setActionCommand("blue");
    jrbc.setActionCommand("black");
    jrbd.setActionCommand("yellow");
    jrbe.setActionCommand("green");
    jrba.setBounds(10, 500,70, 50);
    jrbb.setBounds(100, 500,70, 50);
    jrbc.setBounds(200, 500,70, 50);
    jrbd.setBounds(300, 500,70, 50);
    jrbe.setBounds(400, 500,70,50);
    ButtonGroup group2 = new ButtonGroup(); //组管理，实现颜色单选
    group2.add(jrba);
    group2.add(jrbb);
    group2.add(jrbc);
    group2.add(jrbd);
    group2.add(jrbe);
    jrba.setSelected(true); //默认选择为红色
    jf.add(jrba);
    jf.add(jrbb);
    jf.add(jrbc);
    jf.add(jrbd);
    jf.add(jrbe);

    jf.setDefaultCloseOperation(3);
    jf.setVisible(true);

    /**
    * 获取可以画的区域
    */
    Graphics g = jp.getGraphics();

    DrawUIListener dl = new DrawUIListener(g, group1, group2);
    jp.addMouseListener(dl);
    }
}

/**
* 画图的监听器，实现鼠标监听器接口
*/
import java.awt.Color;
import java.awt.Graphics;
import java.awt.event.*;

import javax.swing.ButtonGroup;
import javax.swing.ButtonModel;
public class DrawUIListener implements MouseListener {
private Graphics g;
private ButtonGroup group1,group2;
private int x1,x2,y1,y2;
String shapetype, colortype;

    public DrawUIListener(Graphics g,ButtonGroup group1,ButtonGroup group2) {
    this.g = g;
    this.group1 = group1;
    this.group2 = group2;
    }

    public void mousePressed(MouseEvent e) {
    x1 = e.getX();
    y1 = e.getY();
    ButtonModel model1 = group1.getSelection();
    ButtonModel model2 = group2.getSelection();
    /**
    * 获取相应图形和颜色对应的指令
    */
    String commond1 = model1.getActionCommand();
    String commond2 = model2.getActionCommand();
    shapetype = commond1;
    colortype = commond2;
    /**
    * 判断得到的指令，并执行相应的颜色选择
    */
    if(colortype.equals("red")) {
      g.setColor(Color.RED);
    }
    else if(colortype.equals("blue")) {
      g.setColor(Color.blue);
    }
    else if(colortype.equals("black")) {
      g.setColor(Color.BLACK);
    }
    else if(colortype.equals("yellow")) {
      g.setColor(Color.YELLOW);
    }
    else if(colortype.equals("green")) {
      g.setColor(Color.GREEN);
    }
    }

    public void mouseReleased(MouseEvent e) {
    x2 = e.getX();
    y2 = e.getY();

    /**
    * 判断得到的指令，并执行相应的图形选择
    */

    if(shapetype.equals("line")) {
      drawLine();
    }
    else if(shapetype.equals("rect")) {

      drawRect();
    }
    else if(shapetype.equals("oval")) {
      drawOval();
    }
    else if(shapetype.equals("3D-rect")) {
      draw3DRect();
    }
    else if(shapetype.equals("Full3DRect")) {
      fill3DRect();
    }

    }

    /**
     * 画直线的方法
     */
    public void drawLine() {
    g.drawLine(x1, y1, x2, y2);
    }

    /**
     * 画矩形的方法
     * 画矩形四中选择drawRect(x,y,width,height)
     * 铭记(x,y)为矩形左上角的坐标，wedth,heigth 为大的减小的
     * 1.从左上角到右下角
     * 2.从左下角到右上角
     * 3.从右下角到左上角
     * 4.从右上角到左下角
     */
    public void drawRect() {
    if(x1<x2&&y1<y2) {
      g.drawRect(x1, y1,x2-x1,y2-y1);   //从左上角到右下角
    }
    else if(x1<x2&&y1>y2) {
      g.drawRect(x1, y2, x2-x1,y1-y2); //从左下角到右上角
    }
    else if(x1>x2&&y2>y1) {
      g.drawRect(x2, y1, x1-x2,y2-y1); //从右上角到左下角
    }
    else if(x1>x2&&y1>y2) {
      g.drawRect(x2, y2, x1-x2, y1-y2); //从右下角到左上角
    }

    }

    /**
     * 画圆或者椭圆的方法
     */
    public void drawOval() {
    if(x1<x2&&y1<y2) {
      g.drawOval(x1, y1,x2-x1,y2-y1);   //从左上角到右下角
    }
    else if(x1<x2&&y1>y2) {
      g.drawOval(x1, y2, x2-x1, y1-y2); //从左下角到右上角
    }
    else if(x1>x2&&y2>y1) {
      g.drawOval(x2, y1, x1-x2,y2-y1); //从右上角到左下角
    }
    else if(x1>x2&&y1>y2) {
      g.drawOval(x2, y2, x1-x2, y1-y2); //从右下角到左上角
    }
    }

    /**
     * 画3D rect 的方法
     */
    public void draw3DRect() {
    if(x1<x2&&y1<y2) {
      g.draw3DRect(x1, y1,x2-x1,y2-y1,true);   //从左上角到右下角
    }
    else if(x1<x2&&y1>y2) {
      g.draw3DRect(x1, y2, x2-x1,y1-y2,true); //从左下角到右上角
    }
    else if(x1>x2&&y2>y1) {
      g.draw3DRect(x2, y1, x1-x2,y2-y1,true); //从右上角到左下角
    }
    else if(x1>x2&&y1>y2) {
      g.draw3DRect(x2, y2, x1-x2, y1-y2,true); //从右下角到左上角
    }
    }


    /**
     * 画fill3D rect 的方法
     */

    public void fill3DRect() {
    if(x1<x2&&y1<y2) {
      g.fill3DRect(x1, y1,x2-x1,y2-y1,true);   //从左上角到右下角
    }
    else if(x1<x2&&y1>y2) {
      g.fill3DRect(x1, y2, x2-x1,y1-y2,true); //从左下角到右上角
    }
    else if(x1>x2&&y2>y1) {
      g.fill3DRect(x2, y1, x1-x2,y2-y1,true); //从右上角到左下角
    }
    else if(x1>x2&&y1>y2) {
      g.fill3DRect(x2, y2, x1-x2, y1-y2,true); //从右下角到左上角
    }
    }