Java实现简易画图板

Java实现简易画图板

本文实例为大家分享了java实现简易画图板的具体代码，供大家参考，具体内容如下

这是Windows系统自带的画图板，我们就是模仿着用Java去写一个简易版的画图板。

效果图

图中的四个颜色按钮是可以配合要画的图形而改变线条颜色的，而且每次打开颜色按钮的颜色都是随机的。目前画图什么的都没什么问题，只是一些细节没有去完全修复了，但不影响使用，再加上近段时间有点太忙，就没有去完善相关细节了，有兴趣的小伙伴可以评论区帮忙提出指正意见哈。

画图板UI界面代码

import java.awt.Color;

import java.awt.Dimension;

import java.awt.FlowLayout;

import javax.swing.JButton;

import javax.swing.JFrame;

import java.awt.Graphics;

import java.util.Random;

public class DrawGraphics {

Random rand=new Random();

public static void main(String []args){

DrawGraphics draw=new DrawGraphics();

draw.displayUI();

}

public JButton getButton(String s,DrawListener dl,boolean flag){

JButton btn=new JButton();

//每个按钮的尺寸

Dimension dim=new Dimension(200,50);

//如果flag为true，创建文字按钮，否则创建颜色按钮

if(flag){

btn=new JButton(s);

}

else{

Color c= new Color(rand.nextInt(256),rand.nextInt(256),rand.nextInt(256));

btn.setBackground(c);

}

btn.setPreferredSize(dim);

btn.addActionListener(dl);

return btn;

}

public void displayUI(){

JFrame frame=new JFrame();

FlowLayout f1=new FlowLayout();

frame.setTitle("画图板");

frame.setSize(1000,1000);

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

frame.setLocationRelativeTo(null);

frame.setLayout(f1);

frame.setResizable(false);

DrawListener dl=new DrawListener();

String []name={"直线","矩形","圆","三角形"};

for(int i=0;i

frame.add(getButton(name[i],dl,true));

}

for(int i=0;i

frame.add(getButton("",dl,false));

}

frame.addMouseListener(dl);

frame.setVisible(true);

// 获取画笔 --- 必须要放在 可视化之后

Graphics g=frame.getGraphics();

dhttp://l.g=g;

http:// dl.btnstr=name[0];

dl.name=name;

}

}

画图板UI监听器代码

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.awt.event.MouseEvent;

import java.awt.event.MouseListener;

import javax.swing.JButton;

import java.awt.Color;

import java.awt.Graphics;

public class DrawListener implements MouseListener,ActionListener{

Graphics g;

int x1,x2,y1,y2;

int x3,x4,x5,y3,y4,y5;

int count=0;

String []name;

String btnstr;

int i;

@Override

public void actionPerformed(ActionEvent e) {

btnstr=e.getActionCommand();

if(btnstr.equals("")){

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

Color btnColor=btn.getBackground();

g.setColor(btnColor);

}

else {

for(i=0;i

if(btnstr.equals(name[i]))break;

}

}

}

@Override

public void mouseClicked(MouseEvent e) {

if(btnstr.equals(name[3])||btnstr.equals("")){

g.drawOval(e.getX()-4, e.getY()-4, 8, 8);

if(count==0){

x3=e.getX();

y3=e.getY();

count++;

}

else if(count==1){

x4=e.getX();

y4=e.getY();

g.drawLine(x3, y3, x4, y4);

count++;

}

else if(count==2){

x5=e.getX();

y5=e.getY();

g.drawLine(x3, y3, x5, y5);

g.drawLine(x4, y4, x5, y5);

count=0;

}

}

}

@Override

public void mousePressed(MouseEvent e) {

// TODO Auto-generated method stub

x1=e.getX();

y1=e.getY();

}

@Override

public void mouseReleased(MouseEvent e) {

// TODO Auto-generated method stub

x2=e.getX();

y2=e.getY();

if(btnstr.equals(name[0])||btnstr.WokuLIsVJuequals("")){

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

}

else if(btnstr.equals(name[1])||btnstr.equals("")){

g.drawRect(Math.min(x1,x2),Math.min(y1,y2),Math.abs(x2-x1),Math.abs(y1-y2));

}

else if(btnstr.equals(name[2])||btnstr.equals("")){

g.drawOval(Math.min(x1,x2),Math.min(y1,y2),Math.abs(x2-x1),Math.abs(y1-y2));

}

}

@Override

public void mouseEntered(MouseEvent e) {

// TODO Auto-generated method stub

}

@Override

public void mouseExited(MouseEvent e) {

// TODO Auto-generated method stub

}

}

frame.add(getButton(name[i],dl,true));

}

for(int i=0;i

frame.add(getButton("",dl,false));

}

frame.addMouseListener(dl);

frame.setVisible(true);

// 获取画笔 --- 必须要放在 可视化之后

Graphics g=frame.getGraphics();

dhttp://l.g=g;

http:// dl.btnstr=name[0];

dl.name=name;

}

}

画图板UI监听器代码

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.awt.event.MouseEvent;

import java.awt.event.MouseListener;

import javax.swing.JButton;

import java.awt.Color;

import java.awt.Graphics;

public class DrawListener implements MouseListener,ActionListener{

Graphics g;

int x1,x2,y1,y2;

int x3,x4,x5,y3,y4,y5;

int count=0;

String []name;

String btnstr;

int i;

@Override

public void actionPerformed(ActionEvent e) {

btnstr=e.getActionCommand();

if(btnstr.equals("")){

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

Color btnColor=btn.getBackground();

g.setColor(btnColor);

}

else {

for(i=0;i

if(btnstr.equals(name[i]))break;

}

}

}

@Override

public void mouseClicked(MouseEvent e) {

if(btnstr.equals(name[3])||btnstr.equals("")){

g.drawOval(e.getX()-4, e.getY()-4, 8, 8);

if(count==0){

x3=e.getX();

y3=e.getY();

count++;

}

else if(count==1){

x4=e.getX();

y4=e.getY();

g.drawLine(x3, y3, x4, y4);

count++;

}

else if(count==2){

x5=e.getX();

y5=e.getY();

g.drawLine(x3, y3, x5, y5);

g.drawLine(x4, y4, x5, y5);

count=0;

}

}

}

@Override

public void mousePressed(MouseEvent e) {

// TODO Auto-generated method stub

x1=e.getX();

y1=e.getY();

}

@Override

public void mouseReleased(MouseEvent e) {

// TODO Auto-generated method stub

x2=e.getX();

y2=e.getY();

if(btnstr.equals(name[0])||btnstr.WokuLIsVJuequals("")){

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

}

else if(btnstr.equals(name[1])||btnstr.equals("")){

g.drawRect(Math.min(x1,x2),Math.min(y1,y2),Math.abs(x2-x1),Math.abs(y1-y2));

}

else if(btnstr.equals(name[2])||btnstr.equals("")){

g.drawOval(Math.min(x1,x2),Math.min(y1,y2),Math.abs(x2-x1),Math.abs(y1-y2));

}

}

@Override

public void mouseEntered(MouseEvent e) {

// TODO Auto-generated method stub

}

@Override

public void mouseExited(MouseEvent e) {

// TODO Auto-generated method stub

}

}

frame.add(getButton("",dl,false));

}

frame.addMouseListener(dl);

frame.setVisible(true);

// 获取画笔 --- 必须要放在 可视化之后

Graphics g=frame.getGraphics();

dhttp://l.g=g;

http:// dl.btnstr=name[0];

dl.name=name;

}

}

画图板UI监听器代码

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.awt.event.MouseEvent;

import java.awt.event.MouseListener;

import javax.swing.JButton;

import java.awt.Color;

import java.awt.Graphics;

public class DrawListener implements MouseListener,ActionListener{

Graphics g;

int x1,x2,y1,y2;

int x3,x4,x5,y3,y4,y5;

int count=0;

String []name;

String btnstr;

int i;

@Override

public void actionPerformed(ActionEvent e) {

btnstr=e.getActionCommand();

if(btnstr.equals("")){

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

Color btnColor=btn.getBackground();

g.setColor(btnColor);

}

else {

for(i=0;i

if(btnstr.equals(name[i]))break;

}

}

}

@Override

public void mouseClicked(MouseEvent e) {

if(btnstr.equals(name[3])||btnstr.equals("")){

g.drawOval(e.getX()-4, e.getY()-4, 8, 8);

if(count==0){

x3=e.getX();

y3=e.getY();

count++;

}

else if(count==1){

x4=e.getX();

y4=e.getY();

g.drawLine(x3, y3, x4, y4);

count++;

}

else if(count==2){

x5=e.getX();

y5=e.getY();

g.drawLine(x3, y3, x5, y5);

g.drawLine(x4, y4, x5, y5);

count=0;

}

}

}

@Override

public void mousePressed(MouseEvent e) {

// TODO Auto-generated method stub

x1=e.getX();

y1=e.getY();

}

@Override

public void mouseReleased(MouseEvent e) {

// TODO Auto-generated method stub

x2=e.getX();

y2=e.getY();

if(btnstr.equals(name[0])||btnstr.WokuLIsVJuequals("")){

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

}

else if(btnstr.equals(name[1])||btnstr.equals("")){

g.drawRect(Math.min(x1,x2),Math.min(y1,y2),Math.abs(x2-x1),Math.abs(y1-y2));

}

else if(btnstr.equals(name[2])||btnstr.equals("")){

g.drawOval(Math.min(x1,x2),Math.min(y1,y2),Math.abs(x2-x1),Math.abs(y1-y2));

}

}

@Override

public void mouseEntered(MouseEvent e) {

// TODO Auto-generated method stub

}

@Override

public void mouseExited(MouseEvent e) {

// TODO Auto-generated method stub

}

}

if(btnstr.equals(name[i]))break;

}

}

}

@Override

public void mouseClicked(MouseEvent e) {

if(btnstr.equals(name[3])||btnstr.equals("")){

g.drawOval(e.getX()-4, e.getY()-4, 8, 8);

if(count==0){

x3=e.getX();

y3=e.getY();

count++;

}

else if(count==1){

x4=e.getX();

y4=e.getY();

g.drawLine(x3, y3, x4, y4);

count++;

}

else if(count==2){

x5=e.getX();

y5=e.getY();

g.drawLine(x3, y3, x5, y5);

g.drawLine(x4, y4, x5, y5);

count=0;

}

}

}

@Override

public void mousePressed(MouseEvent e) {

// TODO Auto-generated method stub

x1=e.getX();

y1=e.getY();

}

@Override

public void mouseReleased(MouseEvent e) {

// TODO Auto-generated method stub

x2=e.getX();

y2=e.getY();

if(btnstr.equals(name[0])||btnstr.WokuLIsVJuequals("")){

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

}

else if(btnstr.equals(name[1])||btnstr.equals("")){

g.drawRect(Math.min(x1,x2),Math.min(y1,y2),Math.abs(x2-x1),Math.abs(y1-y2));

}

else if(btnstr.equals(name[2])||btnstr.equals("")){

g.drawOval(Math.min(x1,x2),Math.min(y1,y2),Math.abs(x2-x1),Math.abs(y1-y2));

}

}

@Override

public void mouseEntered(MouseEvent e) {

// TODO Auto-generated method stub

}

@Override

public void mouseExited(MouseEvent e) {

// TODO Auto-generated method stub

}

}

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