Java drools教程 java draw

前面发布图形绘制存在许多不足：1.缺少功能，图形选择过于少，颜色不够丰富 2.轨迹直线是一大改进，然后采用的布局发生改变不再采用流式布局 3.增加了图形重绘功能 与图形橡皮擦4.简化了按钮代码，极大的减少了工作量。

package Cl.Bdraw;

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

public class draw {
    //第一步需要做的是定义方法然后绘制界面
    //JFrame 默认是边框布局
    //swing 组件都有一个paint方法，绘制组件本身
    public void intui(){
        JFrame jf=new JFrame();
        //设置窗体的大小
        jf.setSize(900,900);
        //设置窗体的名称
        jf.setTitle("小浩的画板");
        //设置屏幕出现时候的位置
        jf.setLocationRelativeTo(null);
        //设置退出窗口
        jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        //设置窗体背景颜色
        jf.getContentPane().setBackground(Color.white);
        //面板容器(JPanel):默认流式布局
        JPanel northPanel = new JPanel();
        northPanel.setBackground(Color.white);
        northPanel.setPreferredSize(new Dimension(0,120));
        jf.add(northPanel, BorderLayout.NORTH);
        //画图画板
        MyPanel centerPanel=new MyPanel();
        centerPanel.setBackground(Color.WHITE);
        jf.add(centerPanel,BorderLayout.CENTER);
        //设置监听器
        drawmouse mouse=new drawmouse();
        //定义字符串数组来存储按钮名称
        String[]name={"直线","三角形","矩形","椭圆","圆","多边形","橡皮擦","轨迹直线"};
        for (int i=0;i<name.length;i++){
            JButton jb=new JButton(name[i]);
            Dimension ds=new Dimension(130,50);
            jb.setPreferredSize(ds);
            northPanel.add(jb);
            jb.addActionListener(mouse);
        }
        Color[]color={Color.blue,Color.cyan,Color.green,Color.yellow};
        for (int i=0;i<color.length;i++){
            JButton ja=new JButton();
            ja.setBackground(color[i]);
            Dimension dsa=new Dimension(130,50);
            ja.setPreferredSize(dsa);
            northPanel.add(ja);
            ja.addActionListener(mouse);
        }
        //窗体显示
        jf.setVisible(true);
        //从窗体获取画笔
        Graphics graphics=centerPanel.getGraphics();
        //拖动监听器的设置
        centerPanel.addMouseListener(mouse);
        //添加鼠标拖动监听器
        centerPanel.addMouseMotionListener(mouse);
        //画笔赋予
        mouse.gr=graphics;
        //把Shape数组从drawmouse类传递给MyPanel类
        centerPanel.shapeArr=mouse.shapeArr;

    }
    public static void main(String[] args) {
        draw b=new draw();
        b.intui();
    }
}

package Cl.Bdraw;

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

public class drawmouse implements MouseListener, ActionListener, MouseMotionListener {
    //画笔
    public Graphics gr;
    //绘制图形时的坐标
    public int x1,y1,x2,y2,x3,y3,x4,y4;
    //初始位置的标记
    public int flag=0;
    //获取按钮上的东西
    public String name;
    //定义Shape数组保存图形对象
    public Shape[]shapeArr=new Shape[100];
    //操作数组的下标
    public int index=0;

    //动作监听器，对接口方法进行重写
    public void actionPerformed(ActionEvent e){
        if("".equals(e.getActionCommand())){
            //获取当前事件源
            JButton jbu=(JButton) e.getSource();
            //获取按钮上的背景颜色，并设置给画笔
            Color color=jbu.getBackground();
            gr.setColor(color);
        }else {
            //获取按钮内容
            name=e.getActionCommand();
            System.out.println("name:"+name);
        }
    }
    public void mouseClicked(MouseEvent e){
        System.out.println("点击");
        x3=e.getX();
        y3=e.getY();
        if("三角形".equals(name)&&flag==1){
            gr.drawLine(x1,y1,x3,y3);
            gr.drawLine(x2,y2,x3,y3);
            flag-=1;
        }
//        if("多边形".equals(name)&&flag==2){
            gr.drawLine(x1,y1,x3,y3);
//            gr.drawLine(x2,y2,x3,y3);
//            gr.drawLine(x3,y3,x2,y2);
//            flag-=2;
//        }

    }
    public void mousePressed(MouseEvent e){
        System.out.println("按下");
        //获取当前坐标值
        if(flag==0){
            x1=e.getX();
            y1=e.getY();
        }
    }
    public void mouseReleased(MouseEvent e){
        //获取当前坐标值
        if (flag == 0) {
            x2 = e.getX();
            y2 = e.getY();
        }
        //开始判别图形标识信息
        if ("直线".equals(name)) {
            //画线开始
            gr.drawLine(x1, y1, x2, y2);
            //创建Shape对象来保存数据
            Shape shape=new Shape(x1,y1,x2,y2,name);
            //保存到数组中
            shapeArr[index]=shape;
            index++;
        }
        if ("圆".equals(name)) {
            //画圆开始
            gr.drawOval(x1,y1,Math.abs(x2-x1),Math.abs(x2-x1));
            //创建Shape对象来保存数据
            Shape shape=new Shape(x1,y1,x2,y2,name);
            //保存到数组中
            shapeArr[index]=shape;
            index++;
        }
        if ("椭圆".equals(name)) {
            //画椭圆开始
            gr.drawOval(x1,y1,Math.abs(x2-x1),Math.abs(y2-y1));
            //创建Shape对象来保存数据
            Shape shape=new Shape(x1,y1,x2,y2,name);
            //保存到数组中
            shapeArr[index]=shape;
            index++;
        }
        if ("矩形".equals(name)) {
            gr.drawRect(x1, y1, Math.abs(x2 - x1), Math.abs(y2 - y1));
            //创建Shape对象来保存数据
            Shape shape=new Shape(x1,y1,x2,y2,name);
            //保存到数组中
            shapeArr[index]=shape;
            index++;
        }
        if ("三角形".equals(name) && flag == 0) {
            gr.drawLine(x1, y1, x2, y2);
            flag += 1;
        }
//        if ("多边形".equals(name)&& flag == 0) {
//            //画多边形开始
//            gr.drawLine(x1,y1,x2,y2);
//            flag+=2;
//        }
        if("橡皮擦".equals(name)){
            {
                gr.setColor(Color.WHITE);
                gr.drawRect(x1, y1, Math.abs(x2 - x1), Math.abs(y2 - y1));
                gr.fillRect(x1, y1, Math.abs(x2 - x1), Math.abs(y2 - y1));
            }
        }
    }
    public void mouseDragged(MouseEvent e) {
        if ("轨迹直线".equals(name)) {
            gr.setColor(Color.white);
            gr.drawLine(x1, y1, x4, y4);
            x4 = e.getX();
            y4 = e.getY();
            gr.setColor(Color.black);
            gr.drawLine(x1, y1, x4, y4);
            //创建Shape对象来保存数据
            Shape shape=new Shape(x1,y1,x2,y2,name);
            //保存到数组中
            shapeArr[index]=shape;
            index++;
        }
    }
    public void mouseMoved(MouseEvent e){
    }
    public void mouseEntered(MouseEvent e){
        System.out.println("进入");
    }
    public void mouseExited(MouseEvent e){
        System.out.println("退出");
    }
}

package Cl.Bdraw;

import java.awt.*;

public class Shape {
    //定义图形的属性
    public int x1,y1,x2,y2;
    public String name;

    //使用定义构造方法来初始化属性
    public Shape(int x1,int y1,int x2,int y2,String name) {
        this.x1 = x1;
        this.x2=x2;
        this.y1=y1;
        this.y2=y2;
        this.name=name;
    }
    //根据所保存的数据来进行图形的还原
    public void drawShape(Graphics g){
        switch (name){
            case "直线":
                g.drawLine(x1,y1,x2,y2);
                break;
            case "矩形":
                g.drawRect(x1, y1, Math.abs(x2 - x1), Math.abs(y2 - y1));
                break;
            case "圆":
                g.drawOval(x1,y1,Math.abs(x2-x1),Math.abs(x2-x1));
                break;
            case "椭圆":
                g.drawOval(x1,y1,Math.abs(x2-x1),Math.abs(y2-y1));
                break;
//            case "轨迹直线":
//                g.setColor(Color.white);
//                break;
        }
    }
}

package Cl.Bdraw;

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

//自定义面板对象
public class MyPanel extends JPanel {
    //定义属性来保存数据
    public Shape[] shapeArr;

    //重写paint方法
    public void paint(Graphics g) {
        //绘制组件本身
        super.paint(g);
        System.out.println("绘制组件");
        //绘制图形，通过遍历shapeArr数组中Shape对象，调用drawShape方法
        for (int i = 0; i < shapeArr.length; i++) {
            Shape shape = shapeArr[i];
            if (shape == null) break;
            System.out.println("shape："+shape);
            shape.drawShape(g);
        }
    }

把效果放在这，部分效果还不够完善，还在进一步探索中，欢迎call我