版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/lpeaceminusone/article/details/82966737
主类
package draw;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.GridLayout;
import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class Draw extends JFrame{
/**
*
*/
private static final long serialVersionUID = 1L;
private JPanel bJpanel,cJpanel,jpanel;
private Drawlistener Listener;
private Graphics g;
Draw(){
super("DRAW");
init();
}
public void init() {
String name[]= {
"画直线", "画椭圆", "画曲线", "多边形",
"橡皮擦", "三角形", "画球形", "笔刷", "喷枪",
"立体矩形", "立体圆", "立体三角",
"枫叶", "画树","画字符", "清空",
"矩形","五角星","多线","字符"
};
Color[] colorArray = {
Color.BLACK,Color.DARK_GRAY,Color.GRAY,
Color.BLUE, new Color(138,43,226),new Color(148,0,211),
new Color(139,0,139),new Color(75,0,130),new Color(106,90,205),
new Color(25,25,112),new Color(30,144,255),new Color(100,149,237),
new Color(135,206,235),new Color(175,238,238),new Color(0,128,128),
new Color(32,178,170),Color.CYAN,Color.GREEN,
Color.MAGENTA,new Color(220,20,60), Color.RED,
new Color(210,105,30),Color.ORANGE,Color.YELLOW,
new Color(240,128,128),Color.PINK,new Color(255,192,203),
new Color(255,240,245), new Color(240,255,240),Color.WHITE,
};
Listener = new Drawlistener();
bJpanel = new JPanel();
bJpanel.setBackground(Color.WHITE);
bJpanel.setLayout(new GridLayout(10,2,6,10));
bJpanel.setPreferredSize(new Dimension(200,500));
bJpanel.setBorder(BorderFactory.createLineBorder(Color.white,3));
for(int i=0;i<name.length;i++) {
JButton but = new JButton (name[i]);
but.addActionListener(Listener);
but.setBackground(Color.GRAY);
but.setBorderPainted(false);
but.setFont(new Font("黑体",Font.PLAIN,14));
but.setForeground(Color.white);
bJpanel.add(but);
}
cJpanel = new JPanel();
cJpanel.setLayout(new GridLayout(1,colorArray.length,0,0));
for(int i=0;i<colorArray.length;i++) {
JButton but = new JButton ();
but.addActionListener(Listener);
but.setBackground(colorArray[i]);
but.setPreferredSize(new Dimension(30,200));
cJpanel.add(but);
}
jpanel = new JPanel();
jpanel.setBackground(Color.white);
jpanel.setBorder(BorderFactory.createLineBorder(Color.white,3));
jpanel.setPreferredSize(new Dimension(950,500));
JButton butt = new JButton ();
butt.setBackground(Color.white);
butt.setPreferredSize(new Dimension(250,200));
butt.setBorder(BorderFactory.createLineBorder(Color.GRAY,1));
this.setVisible(true);
this.setSize(1200,725);
this.setLayout(new FlowLayout());
setDefaultCloseOperation(3);
this.add(bJpanel);
this.add(jpanel);
this.add(cJpanel);
this.add(butt);
g=jpanel.getGraphics();
Listener.setg(g);
Listener.setNowcolor(butt);
Listener.setjp(jpanel,Color.WHITE);
jpanel.addMouseListener(Listener);
jpanel.addMouseMotionListener(Listener);
this.setBackground(Color.BLACK);
setLocationRelativeTo(null);
this.setResizable(false);
}
public static void main(String[] args) {
// TODO Auto-generated method stub
new Draw();
}
}
Drawlistener 类
package draw;
import java.awt.*;
import java.awt.event.*;
import javax.swing.JButton;
import javax.swing.JPanel;
public class Drawlistener implements MouseListener,
ActionListener, MouseMotionListener{
private Color color;
private JPanel jpanel;
private Graphics2D g;
private JButton but;
private String str;
private int x1,y1,x2,y2;
public void setjp(JPanel jpanel,Color c) {
this.jpanel=jpanel;
}
public void setg(Graphics g) {
this.g=(Graphics2D)g;
this.g.setStroke(new BasicStroke(3.0f));
}
public void setNowcolor(JButton butt) {
this.but = butt;
}
@Override
public void mouseDragged(MouseEvent e) {
// TODO Auto-generated method stub
if ("画曲线".equals(str)) {
int x, y;
x = e.getX();
y = e.getY();
g.drawLine(x, y, x1, y1);
x1 = x;
y1 = y;
}
if ("橡皮擦".equals(str)) {
int x, y;
x = e.getX();
y = e.getY();
g.setColor(Color.WHITE);
g.fillRect(x, y, 10, 10);
x1 = x;
y1 = y;
}
}
@Override
public void mouseMoved(MouseEvent e) {
// TODO Auto-generated method stub
}
@Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
if ("".equals(e.getActionCommand())) {
JButton jb = (JButton) e.getSource();
color = jb.getBackground();
but.setBackground(color);//处理当前颜色
} else {
if(e.getActionCommand().equals("清空")){
jpanel.repaint();
}
else
str = e.getActionCommand();
}
}
@Override
public void mouseClicked(MouseEvent e) {
// TODO Auto-generated method stub
}
@Override
public void mousePressed(MouseEvent e) {
// TODO Auto-generated method stub
g.setColor(color);
x1=e.getX();
y1=e.getY();
}
@Override
public void mouseReleased(MouseEvent e) {
// TODO Auto-generated method stub
x2=e.getX();
y2=e.getY();
if ("画直线".equals(str)) {
g.drawLine(x1, y1, x2, y2);
}
if ("立体矩形".equals(str)) {
g.draw3DRect(x1,y1,(int)Math.sqrt((x1-x2)*(x1-x2)+(y1-y2)*(y1-y2)),(int)Math.sqrt((x1-x2)*(x1-x2)+(y1-y2)*(y1-y2)),true);
}
if ("画椭圆".equals(str)) {
g.drawOval(x1,y1,(int)Math.sqrt((x1-x2)*(x1-x2)+(y1-y2)*(y1-y2)),(int)Math.sqrt((x1-x2)*(x1-x2)+(y1-y2)*(y1-y2))/2);
}
if ("立体圆".equals(str)) {
g.drawOval(x1,y1,(int)Math.sqrt((x1-x2)*(x1-x2)+(y1-y2)*(y1-y2)),(int)Math.sqrt((x1-x2)*(x1-x2)+(y1-y2)*(y1-y2)));
}
if ("矩形".equals(str)) {
g.drawRect(x1,y1,(int)Math.sqrt((x1-x2)*(x1-x2)+(y1-y2)*(y1-y2)),(int)Math.sqrt((x1-x2)*(x1-x2)+(y1-y2)*(y1-y2)));
}
if ("三角形".equals(str)||"立体三角".equals(str)) {
int mx=(int)((x1+x2)/2);
int x[]= {mx,Math.max(x1,x2),Math.min(x1,x2)};
int y[]= {Math.min(y1,y2),Math.max(y1,y2),Math.max(y1,y2)};
g.drawPolygon(x,y,3);
}
if ("五角星".equals(str)) {
int x[],y[],x_[],y_[];
x=new int[10];y=new int[10];x_=new int[10];y_=new int[10];
int c = 360 / 5; // 角度
int r=(int)Math.sqrt((x1-x2)*(x1-x2)+(y1-y2)*(y1-y2))/2;
for (int i = 0; i < 5; i++) {
x[i] = (int) (Math.cos(i * c * Math.PI / 30 - Math.PI / 2) * (r) + r);
y[i] = (int) (Math.sin(i * c * Math.PI / 30 - Math.PI / 2) * (r) + r);
}
int r_ = (int) (r * Math.sin(18 * Math.PI / 180) / Math
.sin(126 * Math.PI / 180)); // 内顶点外接圆半径
for (int i = 0; i < 5; i++) {
x_[i] = (int) (Math.cos((i * c + 18) * Math.PI / 30 - Math.PI / 2)
* (r_) + r);
y_[i] = (int) (Math.sin((i * c + 18) * Math.PI / 30 - Math.PI / 2)
* (r_) + r);
}
int[] x1 = { x[0], x[2], x_[2] };
int[] y1 = { y[0], y[2], y_[2] };
int[] x2 = { x[1], x[3], x_[3] };
int[] y2 = { y[1], y[3], y_[3] };
int[] x3 = { x[2], x[4], x_[4] };
int[] y3 = { y[2], y[4], y_[4] };
g.drawPolygon(x1, y1, 3);
g.drawPolygon(x2, y2, 3);
g.drawPolygon(x3, y3, 3);
}
}
@Override
public void mouseEntered(MouseEvent e) {
// TODO Auto-generated method stub
}
@Override
public void mouseExited(MouseEvent e) {
// TODO Auto-generated method stub
}
}