Java 涂鸦

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涂鸦原理：
鼠标一点击产生一个实心圆，拖拽产生实心圆

定义Shape类

package com.lovoinfo.shape;import java.awt.Color;import java.awt.Graphics;/** * 图形(抽象类，不能实例化) * @author Administrator * */public abstract class Shape {    protected int startX,startY;//起点横纵坐标    protected int endX,endY;//终点横纵坐标    protected Color color;    public void setColor(Color color) {        this.color = color;    }    /**     * 绘图(抽象方法留给子类重写)     * @param g　画笔     */    public abstract void draw(Graphics g);    //public abstract void calculate(Graphics g);    public int getStartX() {        return startX;    }    public void setStartX(int startX) {        this.startX = startX;    }    public int getStartY() {        return startY;    }    public void setStartY(int startY) {        this.startY = startY;    }    public int getEndX() {        return endX;    }    public void setEndX(int endX) {        this.endX = endX;    }    public int getEndY() {        return endY;    }    public void setEndY(int endY) {        this.endY = endY;    }}

定义Oval类继承Shape

package com.lovoinfo.shape;import java.awt.Graphics;public class Oval extends Shape{    private int x;    private int y;    public Oval(int x,int y){        this.x=x;        this.y=y;    }    @Override    public void draw(Graphics g) {        g.fillOval(x-2, y-2, 4, 4);    }}

定义窗口类

package com.lovoinfo;import java.awt.Graphics;import java.awt.event.MouseAdapter;import java.awt.event.MouseEvent;import java.util.ArrayList;import java.util.List;import javax.swing.JFrame;import com.lovoinfo.shape.Oval;import com.lovoinfo.shape.Shape;@SuppressWarnings("serial")public class MyFrame extends JFrame {    private List<Shape> shapeList=new ArrayList<Shape>();    private Shape shape;    private boolean isMouseButtonDown;// 判断是否鼠标左键被按下    public MyFrame(){        this.setSize(500, 500);        this.setTitle("我的涂鸦窗口");        this.setLocationRelativeTo(null);        this.setDefaultCloseOperation(EXIT_ON_CLOSE);        //监听鼠标按下        this.addMouseListener(new MouseAdapter() {            @Override            public void mousePressed(MouseEvent e) {                isMouseButtonDown = e.getButton() == MouseEvent.BUTTON1;                if(isMouseButtonDown){                int x = e.getX();//鼠标按下时记录坐标                int y = e.getY();                shape=new Oval(x,y);                shape.setStartX(x);                shape.setStartY(y);                }            }            @Override            public void mouseReleased(MouseEvent e) {                //保存图形                if(isMouseButtonDown && shape!=null){                shapeList.add(shape);            }            }        });        //监听鼠标拖拽        this.addMouseMotionListener(new MouseAdapter() {            @Override            public void mouseDragged(MouseEvent e) {                int x = e.getX();//鼠标拖拽时记录坐标                int y = e.getY();                shape=new Oval(x,y);                shape.setEndX(x);                shape.setEndY(y);                shapeList.add(shape);                repaint();            }        });    }    @Override    public void paint(Graphics g) {        for(Shape shape:shapeList){            shape.draw(g);        }        if(shape != null){            shape.draw(g);        }    }}

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