Test类
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public class Test {
public static void main(String[] args){
DrawBoard db = new DrawBoard();
db.initFrame();
}
}
DrawBoard类
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public class DrawBoard extends JFrame {
Graphics2D g;
public void initFrame(){
//设置窗体大小，直接关闭，居中，标题
this.setSize(800,600);
this.setDefaultCloseOperation(3);
this.setLocationRelativeTo(null);
this.setTitle("画板");
//边框布局
this.setLayout(new BorderLayout());
PanelLeft panelLeft = new PanelLeft(g);//添加面板
PanelCenter panelCenter = new PanelCenter();
PanelDown panelDown= new PanelDown(g,panelLeft);
this.add(panelLeft,BorderLayout.WEST);
this.add(panelCenter,BorderLayout.CENTER);
this.add(panelDown,BorderLayout.SOUTH);
panelLeft.click();//调用面板方法
panelDown.clickColor();
//画板可见
this.setVisible(true);
g =(Graphics2D) panelCenter.getGraphics();//中间面板取画笔并强制转子类
panelLeft.g = g;//画笔传递
panelDown.g = g;
DrawListener mouse = new DrawListener(g,panelLeft);//添加鼠标监听器
panelCenter.addMouseListener(mouse);
panelCenter.addMouseMotionListener(mouse);
}
}
PanelLeft类（左边面板）
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public class PanelLeft extends JPanel {
String actionCommand = "6";
int n;
public Graphics2D g;
Color color = Color.black;
public PanelLeft(Graphics2D g){
this.g = g;
setPreferredSize(new Dimension(70,0));
}
public void click(){
//给按钮添加监听器
ActionListener actionListener = new ActionListener(){
public void actionPerformed(ActionEvent e) {
actionCommand = e.getActionCommand();
n=0;
if("2".equals(actionCommand)){
g.setColor(Color.white);
g.setStroke(new BasicStroke(20));//设置橡皮粗细和颜色
}
else if("7".equals(actionCommand)){
g.setColor(color);
g.setStroke(new BasicStroke(20)); //设置刷子粗细和颜色
}
else{
g.setColor(color);
g.setStroke(new BasicStroke(1));//初始化画笔粗细和颜色
}
}
};
//添加按钮
for(int i = 0;i < 16;i++){
JButton button = new JButton();
ImageIcon image1 = new ImageIcon("images/draw"+i+".jpg");
ImageIcon image2 = new ImageIcon("images/draw"+i+"-1.jpg");
ImageIcon image3 = new ImageIcon("images/draw"+i+"-2.jpg");
ImageIcon image4 = new ImageIcon("images/draw"+i+"-3.jpg");
button.setIcon(image1);//给按钮添加图标
button.setRolloverIcon(image2);
button.setPressedIcon(image3);
button.setSelectedIcon(image4);
button.setPreferredSize(new Dimension(25,25));
this.add(button);
button.addActionListener(actionListener);//按钮添加动作监听
button.setActionCommand(i+"");
}
}
}
PanelDown类（下边面板）
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public class PanelDown extends JPanel {
Color[] colors = { Color.black, Color.gray, Color.red, Color.yellow,Color.blue };
Color color = Color.black;
Graphics2D g;
PanelLeft panelLeft;
public PanelDown(Graphics2D g,PanelLeft pl){
this.g = g;
this.panelLeft = pl;//左边面板传参
}
public void clickColor(){
ActionListener listener = new ActionListener() {
public void actionPerformed(ActionEvent e) {
String actionCommandColor = e.getActionCommand();
int i = Integer.valueOf(actionCommandColor);// String -> int <span style="white-space:pre"> </span>//字符串型转换成整型
color = colors[i];
g.setColor(color);
panelLeft.color = color;//把颜色传给左边面板
if("2".equals(panelLeft.actionCommand)){
g.setColor(Color.white);//橡皮设置白色
}
}
};
for (int i = 0; i < colors.length; i++){
// 创建颜色按钮
JButton buttoncolor = new JButton();
buttoncolor.setBackground(colors[i]);
buttoncolor.setPreferredSize(new Dimension(25, 25));
buttoncolor.addActionListener(listener);//颜色按钮添加动作监听器
buttoncolor.setActionCommand(i + "");
// 面板添加颜色按钮
this.add(buttoncolor);
}
}
}
PanelCenter类（中间面板）
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public class PanelCenter extends JPanel {
public PanelCenter(){
setBackground(Color.white);//设置背景色
}
}
DrawListener类（鼠标监听器类）
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public class DrawListener implements MouseMotionListener,MouseListener {
int x1,y1,x2,y2,a,b,xS,yS;
PanelLeft panelLeft;
Graphics2D g;
Random random = new Random();
public DrawListener(Graphics2D g,PanelLeft pl){
this.g = g;
this.panelLeft = pl;
}
public void mouseClicked(MouseEvent e) {
int clickCount = e.getClickCount();//记录点击次数
if(clickCount==1)
{
}
else if(clickCount==2)
{
if("13".equals(panelLeft.actionCommand)){
g.drawLine(x2, y2, xS, yS);//双击自动完成多边形绘制
panelLeft.n = 0;
}
}
}
public void mousePressed(MouseEvent e) {
x1 = e.getX();
y1 = e.getY();
if("13".equals(panelLeft.actionCommand)){
if(panelLeft.n != 0){
x1 = a; //设置多边形中间值
y1 = b;
}
if(panelLeft.n == 0){
xS = e.getX();//记录多边形起点
yS = e.getY();
}
}
}
public void mouseReleased(MouseEvent e) {
x2 = e.getX();
y2 = e.getY();
if("10".equals(panelLeft.actionCommand)){
//直线
g.drawLine(x1, y1, x2, y2);
}
else if("12".equals(panelLeft.actionCommand)){
//矩形
g.drawRect(Math.min(x1, x2), Math.min(y1, y2), Math.abs(x2 - x1), Math.abs(y2 - y1));
}
else if("14".equals(panelLeft.actionCommand)){
// 椭圆
g.drawOval(Math.min(x1, x2), Math.min(y1, y2), Math.abs(x2 - x1), Math.abs(y2 - y1));
}
else if("13".equals(panelLeft.actionCommand)){
//多边形
g.drawLine(x1, y1, x2, y2);
a = x2;
b = y2;
panelLeft.n++;
}
}
public void mouseEntered(MouseEvent e) {
}
public void mouseExited(MouseEvent e) {
}
public void mouseDragged(MouseEvent e) {
if("6".equals(panelLeft.actionCommand)){
x2 = e.getX();
y2 = e.getY();
//绘制铅笔
g.drawLine(x1, y1, x2, y2);
x1 = x2;
y1 = y2;
}
else if("2".equals(panelLeft.actionCommand)){
x2 = e.getX();
y2 = e.getY();
//橡皮
g.drawLine(x1, y1, x2, y2);
x1 = x2;
y1 = y2;
}
else if ("8".equals(panelLeft.actionCommand))
{
x2 = e.getX();
y2 = e.getY();
// 喷枪
for (int i = 0; i < 30; i++) {
// 生成的随机数
int nextInt1 = random.nextInt(8) - 4;// [0,9]->[-5,4]
int nextInt2 = random.nextInt(8) - 4;// [0,9]->[-5,4]
// 画点
g.drawLine(x2 + nextInt1, y2 + nextInt2, x2+ nextInt1, y2 + nextInt2);
}
}
else if("7".equals(panelLeft.actionCommand)){
x2 = e.getX();
y2 = e.getY();
//刷子
g.drawLine(x1, y1, x2, y2);
x1 = x2;
y1 = y2;
}
}
public void mouseMoved(MouseEvent e) {
}
}
