Java简单的画图工具，包括简单的图形绘制，排序可视化，颜色按钮

图形绘制

1.创建窗体；
2.给按钮加上监听；
3.添加组件；
4.在监听器中加入按钮响应；
5.绘制图形；`

窗体代码

import java.awt.Color;
import java.awt.FlowLayout;
import java.awt.Graphics;

import javax.swing.JButton;
import javax.swing.JFrame;

public class DrawWindow {
	
	public static void main(String[] args) {
	//创建窗体对象
	DrawWindow dw=	new DrawWindow();
	dw.outUI();
	}
	// 图形按钮 
	String[] btnstrs = {"直线","矩形","圆","3D图形","三角"};
	public void outUI(){
		//创建按钮监听对象
		MyDrawListen bn=new MyDrawListen();
		JFrame hf=new JFrame();
		//设置标题
		hf.setTitle("图形绘制");
		//设置窗体大小
		hf.setSize(1200,900);
		FlowLayout fl = new FlowLayout();
		hf.setLayout(fl);
		for(int i=0;i<btnstrs.length;i++) {
			//加载图形按钮在窗体上
			JButton btn = new  JButton();
			btn.setText(btnstrs[i]);
			hf.add(btn);
			btn.addActionListener(bn);//加上监听
		}
		
		
		
		hf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		hf.setVisible(true);
		
		hf.addMouseListener(bn);
		
		
		bn.addMouseListener(bn);
		
		//画笔对象
		//将画笔对象传入监听器
		Graphics j = hf.getGraphics();
		bn.f1=j;
		
		
				
	}
}

监听器代码

import java.awt.Color;
import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.util.Random;

public  class  MyDrawListen implements MouseListener ,java.awt.event.ActionListener{
	
	Graphics f1=null;
	int x1,y1,x2,y2;
	public int abs(int a) {
		if(a>=0){
			return a;
		}
		else
		return -a;
	}
	public int min(int a,int b) {
		if(a>=b)
			return b;
		else
		return a;
	}
	//绘制等腰三角形
	public void drawTra1(int x1,int y1,int x2,int y2) {
		int a;
		a=x1-(x2-x1);
		f1.drawLine(x1,y1,x2,y2);
		f1.drawLine(x1,y1,a, y2);
		f1.drawLine(a, y2, x2, y2);
	}
	public void mousePressed(MouseEvent e) {
		x1=e.getX();y1=e.getY();
	}
	
	public void mouseReleased(MouseEvent e) {
		x2=e.getX();y2=e.getY();
	
		
		if(shapstr.equals("直线")) {
			f1.drawLine(x1, y1, x2, y2);
		}
		else if(shapstr.equals("圆"))
		{
			if(x2-x1>0&&y2-y1>0)
			f1.drawOval(x1, y1, x2, y2);
			else if(x2-x1<0&&y2-y1<0){
			}
		}
		else if(shapstr.equals("矩形")){
			f1.drawRect(min(x1,x2), min(y1,y2), abs(x2-x1), abs(y2-y1));
		}
		else if(shapstr.equals("3D图形")){
			for(int i=0;i<200;i++) {
				Color color = new Color(i,0,0);
				f1.setColor(color);
				f1.drawOval(x1, y1, i+=10, i+=10);
			}
			
		}
		else if(shapstr.equals("三角")) {
			drawTra1(x1, y1, x2, y2);
		}
		String bitstr,shapstr;//shapstr用来存放读取的按钮上读取的汉字
	public void actionPerformed(ActionEvent e) {
		bitstr=e.getActionCommand();
		if(bitstr.equals("")) {
			//将窗体中的按钮传入监听器
		javax.swing.JButton btn =(javax.swing.JButton)	e.getSource();
		    //获取按钮背景色
			Color color = btn.getBackground();
			f1.setColor(color);
		}else {
		 shapstr=bitstr;
		}
	}

颜色按钮-排序可视化

创建颜色数组 
Color[]   colors ={Color.black , Color.red };
生成按钮
加上监听器 
加载到窗体上
	
通过按钮上是否有字符串 来区分是图形类型按钮 还是 颜色按钮

处理颜色按钮
1、先获取按钮对象  get事件源对象 
2、获取按钮的背景色
3、将这个颜色设置给画笔


可视化排序 

根据初始化的数组 
开始排序，每排一个就将数组绘制一次 图形
绘制之前最好清空，填充一个矩形  fill ；

窗体代码

import java.awt.Color;
import java.awt.FlowLayout;
import java.awt.Graphics;

import javax.swing.JButton;
import javax.swing.JFrame;

public class DrawWindow {
	
	public static void main(String[] args) {
	//创建窗体对象
	DrawWindow dw=	new DrawWindow();
	dw.outUI();
	}
	// 图形按钮 
	String[] btnstrs = {"直线","矩形","圆","3D图形","三角","冒泡排序","选择排序"};
	//颜色按钮
	Color[] color = {Color.black,Color.red,Color.blue,Color.PINK};
	
	
	public void outUI(){
		//创建按钮监听对象
		MyDrawListen bn=new MyDrawListen();
		JFrame hf=new JFrame();
		//设置标题
		hf.setTitle("图形绘制");
		//设置窗体大小
		hf.setSize(1200,900);
		FlowLayout fl = new FlowLayout();
		hf.setLayout(fl);
		for(int i=0;i<btnstrs.length;i++) {
			//加载图形按钮在窗体上
			JButton btn = new  JButton();
			btn.setText(btnstrs[i]);
			hf.add(btn);
			btn.addActionListener(bn);//加上监听
		}
		for(int i=0;i<color.length;i++) {
			JButton btn2 = new JButton();
			//设置按钮 颜色
			btn2.setBackground(color[i]);
			java.awt.Dimension dim = new java.awt.Dimension(30,30);
			btn2.setPreferredSize(dim);
			
			hf.add(btn2);
			btn2.addActionListener(bn);
			
		}
		
		
		
		hf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		hf.setVisible(true);
		
		hf.addMouseListener(bn);
		
		
		bn.addMouseListener(bn);
		
		//画笔对象
		//将画笔对象传入监听器
		Graphics j = hf.getGraphics();
		bn.f1=j;
	}
}

监听器代码

import java.awt.Color;
import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.util.Random;

public  class  MyDrawListen implements MouseListener ,java.awt.event.ActionListener{
	
	Graphics f1=null;
	int x1,y1,x2,y2;
	public int abs(int a) {
		if(a>=0){
			return a;
		}
		else
		return -a;
	}
	public int min(int a,int b) {
		if(a>=b)
			return b;
		else
		return a;
	}
	//绘制等腰三角形
	public void drawTra1(int x1,int y1,int x2,int y2) {
		int a;
		a=x1-(x2-x1);
		f1.drawLine(x1,y1,x2,y2);
		f1.drawLine(x1,y1,a, y2);
		f1.drawLine(a, y2, x2, y2);
	}
	//排序可视化
	public void sort1() {
		int a[] = new int[300];
		Random ran = new Random();
		//用随机数初始化数组
		for (int i = 0; i < a.length; i++) {
			a[i]=ran.nextInt(1000);
		}
		int temp;
		for(int i=0;i<a.length;i++) {
			Color color = Color.blue;
			f1.setColor(color);
			f1.fillRect(0+i*3,100,2,a[i]);
		}
		for(int i=0;i<a.length;i++) {
			for(int j=i+1;j<a.length;j++) {
				if(a[i]>a[j]) {
					temp=a[i];
					a[i]=a[j];
					a[j]=temp;
				}
			
			}
			//延时。使排序可视化
			try {
				Thread.sleep(80);
			} catch (InterruptedException e) {
				e.printStackTrace();
			}
			f1.setColor(Color.black);
			f1.fillRect(0,100,1200,1100);
			for (int k = 0; k < a.length; k++) {
				f1.setColor(Color.green);
				f1.fillRect(0+k*3,100,2,a[k]);
			}
			
		}
	}
	//选择排序
	public void sort2() {
		int b[] = new int[300];
		Random ran2 = new Random();
		for (int i = 0; i < b.length; i++) {
			b[i]=ran2.nextInt(1000);
		}
		int temp;
		for(int i=0;i<b.length;i++) {
			Color color = Color.blue;
			f1.setColor(color);
			f1.fillRect(0+i*3,100,2,b[i]);
		}
		for(int i=0;i<b.length;i++) {
			int min=i;
			for(int j=i+1;j<b.length;j++) {
				if(b[j]<b[min]) {
					min=j;
				}
			}
			if(min!=i) {
				temp=b[i];
				b[i]=b[min];
				b[min]=temp;
			}
			try {
				Thread.sleep(80);
			} catch (InterruptedException e) {
				e.printStackTrace();
			}
//			Color color = Color.yellow;
			f1.setColor(Color.black);
			f1.fillRect(0,100,1200,1100);
			for (int k = 0; k < b.length; k++) {
				f1.setColor(Color.green);
				f1.fillRect(0+k*3,100,2,b[k]);
			}
		}
	}
	
	public void mousePressed(MouseEvent e) {
		x1=e.getX();y1=e.getY();
	}
	
	public void mouseReleased(MouseEvent e) {
		x2=e.getX();y2=e.getY();
	
		
		if(shapstr.equals("直线")) {
			f1.drawLine(x1, y1, x2, y2);
		}
		else if(shapstr.equals("圆"))
		{
			if(x2-x1>0&&y2-y1>0)
			f1.drawOval(x1, y1, x2, y2);
			else if(x2-x1<0&&y2-y1<0){
			}
		}
		else if(shapstr.equals("矩形")){
			f1.drawRect(min(x1,x2), min(y1,y2), abs(x2-x1), abs(y2-y1));
		}
		else if(shapstr.equals("3D图形")){
			for(int i=0;i<200;i++) {
				Color color = new Color(i,0,0);
				f1.setColor(color);
				f1.drawOval(x1, y1, i+=10, i+=10);
			}
			
		}
		else if(shapstr.equals("三角")) {
			drawTra1(x1, y1, x2, y2);
		}
		else if(shapstr.equals("冒泡排序")) {
			sort1();
		}
		else if(shapstr.equals("选择排序")){
			sort2();
		}
		
		
	}
	
	
	String bitstr,shapstr;//shapstr用来存放读取的按钮上读取的汉字
	public void actionPerformed(ActionEvent e) {
		bitstr=e.getActionCommand();
		if(bitstr.equals("")) {
			//将窗体中的按钮传入监听器
		javax.swing.JButton btn =(javax.swing.JButton)	e.getSource();
		    //获取按钮背景色
			Color color = btn.getBackground();
			f1.setColor(color);
		}else {
		 shapstr=bitstr;
		}
	}