//图形接口

packageCbs;//图形集合

public interfaceNetJavaShape {public abstract voiddraw();

}//直线类

packageCbs;importjava.awt.Color;importjava.awt.Graphics;importCbs.NetJavaShape;public class ImpLine implementsNetJavaShape{

Graphics g;intx1, y1,x2, y2;

Color c;public ImpLine(Graphics g,int x1,int y1,int x2,inty2,Color c){this.g=g;this.c=c;this.x1=x1;this.y1=y1;this.x2=x2;this.y2=y2;

}public voiddraw() {

g.setColor(c);

g.drawLine(x1, y1, x2, y2);

}

}//DrawListener类

packageCbs;importjava.awt.Color;importjava.awt.Graphics;importjava.util.List;importjava.awt.event.ActionEvent;importjava.awt.event.ActionListener;importjava.awt.event.MouseEvent;importjava.awt.event.MouseListener;importjava.awt.event.MouseMotionListener;importjava.util.ArrayList;importCbs.NetJavaShape;importjavax.swing.JButton;public class DrawListener implementsActionListener, MouseListener,

MouseMotionListener {private Color color=Color.BLACK;//颜色属性,初始值为黑色

private Graphics g;//画笔属性

private String str;//保存按钮上的字符串，区分不同的按钮

private int x1,y1,x2,y2;//(x1,y1),(x2,y2)分别为鼠标的按下和释放时的坐标

private JButton nowColor;//当前颜色按钮//保存图形对象的集合

private List shapesArray = new ArrayList();//图形

privateNetJavaShape shape;//在draw类中获取集合

public ListgetShapesArray() {returnshapesArray;

}//获取Draw类的画笔对象

public voidsetG(Graphics g) {this.g =g;

}//获取当前颜色按钮

public voidsetNowColor(JButton nowColor) {this.nowColor =nowColor;

}

@Override//鼠标拖动的方法

public voidmouseDragged(MouseEvent e) {//画曲线的方法

if ("画曲线".equals(str)) {intx, y;

x=e.getX();

y=e.getY();//实例化对象，曲线也是直线画的所以不同新建一个曲线类了

shape=newImpLine(g,x,y,x1,y1,color);//调用画图方法

shape.draw();//将图形存入集合中

shapesArray.add(shape);//g.drawLine(x, y, x1, y1);

x1 =x;

y1=y;

}

}

@Override//鼠标移动方法

public voidmouseMoved(MouseEvent e) {

}

@Override//鼠标单击方法

public voidmouseClicked(MouseEvent e) {

}

@Override//鼠标按下方法

public voidmousePressed(MouseEvent e) {

g.setColor(color);//改变画笔的颜色

x1=e.getX();//获取按下时鼠标的x坐标

y1=e.getY();//获取按下时鼠标的y坐标

}

@Override//鼠标释放方法

public voidmouseReleased(MouseEvent e) {

x2=e.getX();//获取释放时鼠标的x坐标

y2=e.getY();//获取释放时鼠标的y坐标//画直线的方法

if ("画直线".equals(str)) {//实例化对象，

shape=newImpLine(g,x1,y1,x2,y2,color);//调用画图方法

shape.draw();//将图形存入集合中

shapesArray.add(shape);//g.drawLine(x1, y1, x2, y2);

}

}

@Override//鼠标进入方法

public voidmouseEntered(MouseEvent e) {

}

@Override//鼠标退出方法

public voidmouseExited(MouseEvent e) {

}

@Override//处理按钮上的鼠标点击动作

public voidactionPerformed(ActionEvent e) {if ("".equals(e.getActionCommand())) {

JButton jb=(JButton) e.getSource();

color=jb.getBackground();

nowColor.setBackground(color);//处理当前颜色

} else{

str=e.getActionCommand();

}

}

}//draw类

packageCbs;importjava.awt.Color;importjava.awt.Dimension;importjava.awt.FlowLayout;importjava.awt.Graphics;importjava.awt.GridLayout;importjava.util.ArrayList;importjava.util.List;importjavax.swing.JButton;importjavax.swing.JFrame;importjavax.swing.JPanel;/*** Draw类，用于界面的初始化

*@authorCBS*/@SuppressWarnings("serial")public class Draw extendsJFrame {privateDrawListener dl;privateGraphics g;//保存图形对象的集合

private List shapesArray = new ArrayList();//界面初始化方法

public voidshowUI() {

setTitle("画图");//窗体名称

setSize(1200, 900);//窗体大小

setDefaultCloseOperation(3);

setLocationRelativeTo(null);//窗体居中

FlowLayout layout = new FlowLayout(FlowLayout.LEFT);//流式布局左对齐

setLayout(layout);//窗体使用流式布局管理器

this.setResizable(false);//窗体大小不变//使用数组保存按钮名

String buttonName[] = { "画直线", "画椭圆", "画曲线", "多边形", "橡皮擦", "拖动线","三角形", "画球形", "笔刷", "喷枪", "色子", "立体矩形", "立体圆", "立体三角","迭代分形", "现代分形", "枫叶", "画树", "mandelbrot集", "L-System", "迭代画线","迭代三角形", "谢尔宾斯基地毯", "画字符", "清空","吸管" ,"矩形","五角星","多线","字符"};

JPanel jp1=new JPanel(new GridLayout(15, 2,10,10));//用于保存图形按钮，使用网格布局

jp1.setPreferredSize(new Dimension(200, 800));//实例化DrawListener对象

dl=newDrawListener();//循环为按钮面板添加按钮

for (int i = 0; i < buttonName.length; i++) {

JButton jbutton= newJButton(buttonName[i]);

jbutton.addActionListener(dl);//为按钮添加监听

jp1.add(jbutton);

}

JPanel jp2=new JPanel();//画布面板

jp2.setPreferredSize(new Dimension(970, 800));

jp2.setBackground(Color.WHITE);//定义Color数组，用来存储按钮上要显示的颜色信息

Color[] colorArray ={ Color.BLUE, Color.GREEN, Color.RED, Color.BLACK,Color.ORANGE,Color.PINK,Color.CYAN,Color.MAGENTA,Color.DARK_GRAY,Color.GRAY,Color.LIGHT_GRAY,Color.YELLOW};//用于保存颜色按钮的面板

JPanel jp3=new JPanel(new GridLayout(1,colorArray.length,3,3));//循环遍历colorArray数组，根据数组中的元素来实例化按钮对象

for (int i = 0; i < colorArray.length; i++) {

JButton button= newJButton();

button.setBackground(colorArray[i]);

button.setPreferredSize(new Dimension(30, 30));

button.addActionListener(dl);//为按钮添加监听

jp3.add(button);

}//将面板添加到主窗体

this.add(jp1);this.add(jp2);this.add(jp3);//添加按钮，作为当前颜色

JButton nowColor=newJButton();

nowColor.setPreferredSize(new Dimension(40,40));

nowColor.setBackground(Color.BLACK);//默认黑色

add(nowColor);//设置窗体的组件可见，如果为FALSE就看不到任何组件

setVisible(true);//获取画笔对象

g=jp2.getGraphics();

dl.setG(g);

dl.setNowColor(nowColor);//获取保存的集合

shapesArray=dl.getShapesArray();//为面板添加鼠标监听，用于绘制图形

jp2.addMouseListener(dl);

jp2.addMouseMotionListener(dl);

}

@Override//重写paint方法

public voidpaint(Graphics g) {//调用父类的paint方法，绘制界面上的组件

super.paint(g);//foreach遍历集合

for(NetJavaShape l : shapesArray) {

l.draw();

}

}

}