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Java实现简单的图形绘制程序（多种图形，多种颜色）

今天我用GUI图形绘制组件，做了一个图形绘制工具，实现了连续划线、划线效果。图形方面支持直线、圆、椭圆、正方形、长方形的绘制，颜色选择方面支持红色、橙色、黄色、绿色、白色、蓝色、粉色。

效果预览

文件树

在这里插入图片描述

文件准备

在这里插入图片描述
在这里插入图片描述
在这里插入图片描述
在这里插入图片描述
在这里插入图片描述
这几张图片被存放在了src/image里面。在这里插入图片描述

代码如下

这个图形绘制程序一共有5个java文件构成：
colorButton.java实现了选择颜色按钮的相关功能
lineButton.java实现了选择图形按钮的相关功能
drawingDesk.java实现了画图区域的画图功能
drawingpicture.java实现了将所有功能汇总的并展示的功能
最后还有一个运行文件Testing.java

colorButton.java代码
package test5;

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

public class colorButton extends JPanel implements ActionListener{
	
	JToggleButton btn1 = new JToggleButton("红色");
	JToggleButton btn2 = new JToggleButton("橙色") ;
	JToggleButton btn3 = new JToggleButton("黄色");
	JToggleButton btn4 = new JToggleButton("绿色");
	JToggleButton btn5 = new JToggleButton("白色");
	JToggleButton btn6 = new JToggleButton("蓝色");
	JToggleButton btn7 = new JToggleButton("粉色");
	ButtonGroup bg =new ButtonGroup();
	public colorButton() {
		this.setLayout(new GridLayout(9,1));
		this.setBorder(BorderFactory.createEtchedBorder());
		btn1.setBackground(Color.RED);
		btn2.setBackground(Color.ORANGE);
		btn3.setBackground(Color.YELLOW);
		btn4.setBackground(Color.GREEN);
		btn5.setBackground(Color.WHITE);
		btn6.setBackground(Color.BLUE);
		btn7.setBackground(Color.PINK);
		
		btn1.addActionListener(this);
		btn2.addActionListener(this);
		btn3.addActionListener(this);
		btn4.addActionListener(this);
		btn5.addActionListener(this);
		btn6.addActionListener(this);
		btn7.addActionListener(this);
		this.add(btn1);
		this.add(btn2);
		this.add(btn3);
		this.add(btn4);
		this.add(btn5);
		this.add(btn6);
		this.add(btn7);
		
	}
	public void actionPerformed(ActionEvent e) {
		
		if(e.getSource()==btn1||e.getSource()==btn2||e.getSource()==btn3||e.getSource()==btn4
			||e.getSource()==btn5||e.getSource()==btn6||e.getSource()==btn7) {
			btn1.setSelected(false);
			btn2.setSelected(false);
			btn3.setSelected(false);
			btn4.setSelected(false);
			btn5.setSelected(false);
			btn6.setSelected(false);
			btn7.setSelected(false);
			JToggleButton btn = (JToggleButton)e.getSource();
			btn.setSelected(true);
			}
	
	}
	
}
lineButton.java代码
package test5;

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

public class lineButton extends JPanel implements ActionListener{
	ImageIcon icon1 = new ImageIcon("src/image/直线.png");
	ImageIcon icon2 = new ImageIcon("src/image/圆.png");
	ImageIcon icon3 = new ImageIcon("src/image/tx-正方形.png");
	ImageIcon icon4 = new ImageIcon("src/image/椭圆形.png");
	ImageIcon icon5 = new ImageIcon("src/image/tx-长方形.png");
	
	
	JToggleButton btn1 = new JToggleButton(icon1);
	JToggleButton btn2 = new JToggleButton(icon2);
	JToggleButton btn3 = new JToggleButton(icon3);
	JToggleButton btn4 = new JToggleButton(icon4);
	JToggleButton btn5 = new JToggleButton(icon5);
	
	public lineButton() {
		icon1.setImage(icon1.getImage().getScaledInstance(40, 40,Image.SCALE_DEFAULT ));
		icon2.setImage(icon2.getImage().getScaledInstance(40, 40,Image.SCALE_DEFAULT ));
		icon3.setImage(icon3.getImage().getScaledInstance(40, 40,Image.SCALE_DEFAULT ));
		icon4.setImage(icon4.getImage().getScaledInstance(40, 40,Image.SCALE_DEFAULT ));
		icon5.setImage(icon5.getImage().getScaledInstance(40, 40,Image.SCALE_DEFAULT ));
		this.setLayout(new GridLayout(9,1));
		btn1.addActionListener(this);
		btn2.addActionListener(this);
		btn3.addActionListener(this);
		btn4.addActionListener(this);
		btn5.addActionListener(this);
		this.setBorder(BorderFactory.createEtchedBorder());
		this.add(btn1);
		this.add(btn2);
		this.add(btn3); 
		this.add(btn4);
		this.add(btn5);
		
	}
	public void actionPerformed(ActionEvent e) {
		
		if(e.getSource()==btn1||e.getSource()==btn2||e.getSource()==btn3||e.getSource()==btn4
				||e.getSource()==btn5) {
				btn1.setSelected(false);
				btn2.setSelected(false);
				btn3.setSelected(false);
				btn4.setSelected(false);
				btn5.setSelected(false);
				JToggleButton btn = (JToggleButton)e.getSource();
				btn.setSelected(true);
				}
	}

}
drawingDesk.java代码
package test5;

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;
import java.util.Arrays;
import javax.swing.JLabel;
import javax.swing.JPanel;

public class drawingDesk extends JPanel implements MouseListener, MouseMotionListener{
	private int[] x1 = new int[0]; 
	private int[] y1 = new int[0]; 
	private int[] x2 = new int[0]; 
	private int[] y2 = new int[0]; 
	private Color[] xycolor = new Color[0];
	private int[] xyshape = new int[0];
	
	public lineButton l;
	public colorButton c;
	public JPanel pa= new JPanel();
	public drawingDesk(){
		
		l = new lineButton();
		c = new colorButton();

		this.setLayout(new BorderLayout());
		this.add(l,BorderLayout.WEST);
		this.add(c,BorderLayout.EAST);
		this.add(pa,BorderLayout.CENTER);
		//注册当前组件鼠标监听
		this.addMouseListener(this);
		this.addMouseMotionListener(this);
		
	}

	
	@Override
	public void paint(Graphics g) {//第一次显示的时候，由系统自动调用。
		
		super.paint(g);
		int j=0;
		for(int i=0; i < x1.length; i++,j++){
			
			g.setColor(xycolor[j]);
			choiceShape(g,i,xyshape[j]);
			
		}
	}
	
	
	
	//鼠标点击事件
	@Override
	public void mouseClicked(MouseEvent e) {
		// TODO Auto-generated method stub
	}
	
	//鼠标按压事件
	@Override
	public void mousePressed(MouseEvent e) {
		//对数组进行扩容

		if(l.btn1.isSelected()||l.btn2.isSelected()||l.btn3.isSelected()||l.btn4.isSelected()||l.btn5.isSelected()) {
			x1 = Arrays.copyOf(x1, x1.length + 1);
			y1 = Arrays.copyOf(y1, y1.length + 1);
			x2 = Arrays.copyOf(x2, x2.length + 1);
			y2 = Arrays.copyOf(y2, y2.length + 1);
			xycolor = Arrays.copyOf(xycolor,xycolor.length+1);
			xyshape = Arrays.copyOf(xyshape,xyshape.length+1);
			//获得起始点坐标
			x1[x1.length - 1] = e.getX();
			y1[y1.length - 1] = e.getY();
			xycolor[xycolor.length-1] = getUserColor();

			xyshape[xyshape.length-1] = getUserShape();
		}
	}

	
	//鼠标松开事件
	@Override
	public void mouseReleased(MouseEvent e) {
		// TODO Auto-generated method stub
		//设置结束点坐标
		if(l.btn1.isSelected()||l.btn2.isSelected()||l.btn3.isSelected()||l.btn4.isSelected()||l.btn5.isSelected()) {
			x2[x2.length - 1] = e.getX();
			y2[y2.length - 1] = e.getY();
//			repaint();
		}

	}

	@Override
	public void mouseEntered(MouseEvent e) {
		// TODO Auto-generated method stub
		
	}

	@Override
	public void mouseExited(MouseEvent e) {
		// TODO Auto-generated method stub
		
	}

	//鼠标拖动事件（实现拖动显示线条的效果）
	@Override
	public void mouseDragged(MouseEvent e) {
		// TODO Auto-generated method stub
//		System.out.println(e.getX() + ", " + e.getY());
		if(l.btn1.isSelected()||l.btn2.isSelected()||l.btn3.isSelected()||l.btn4.isSelected()||l.btn5.isSelected()) {
			x2[x2.length - 1] = e.getX();
			y2[y2.length - 1] = e.getY();
			repaint();
		}
		
	}


	@Override
	public void mouseMoved(MouseEvent e) {
		// TODO Auto-generated method stub

	}
	public int getUserShape() {
		if(l.btn1.isSelected()) {	
			return 1;
		}
		else if(l.btn2.isSelected()) {	
			return 2;
		}
		else if(l.btn3.isSelected()) {	
			return 3;
		}
		else if(l.btn4.isSelected()) {	
			return 4;
		}
		else if(l.btn5.isSelected()) {	
			return 5;
		}
		else {
			return 0;
		}

		}

	public Color getUserColor() {

		if(c.btn1.isSelected()) {	
			return Color.RED;
		}
		else if(c.btn2.isSelected()) {	
			return (Color.ORANGE);
		}
		else if(c.btn3.isSelected()) {	
			return (Color.YELLOW);
		}
		else if(c.btn4.isSelected()) {	
			return (Color.GREEN);
		}
		else if(c.btn5.isSelected()) {	
			return (Color.WHITE);
		}
		else if(c.btn6.isSelected()) {	
			return (Color.BLUE);
		}
		else if(c.btn7.isSelected()) {	
			return (Color.PINK);
		}
		else {
			return Color.BLACK;
		}
		
	}
	
    public void choiceShape(Graphics g,int i,int way) {
		if(way==1) {
			g.drawLine(x1[i],y1[i],x2[i],y2[i]);
			
		}else if(way==2) {
			g.drawOval(x1[i],y1[i],(x2[i]-x1[i]),(x2[i]-x1[i]));
			
		}else if(way==3) {
			g.drawRect(x1[i],y1[i],(x2[i]-x1[i]),(x2[i]-x1[i]));
			
		}else if(way==4) {
			g.drawOval(x1[i],y1[i],(x2[i]-x1[i]),(y2[i]-y1[i]));
			
			
		}else if(way==5) {
			g.drawRect(x1[i],y1[i],(x2[i]-x1[i]),(y2[i]-y1[i]));
		}
		else if(way==0) {
			return;
		}
		
	}
	

}
drawingpicture.java代码
package test5;

import javax.swing.*;
import java.awt.*;
public class drawpicture{
	public drawingDesk d;
	JFrame f = new JFrame();
	public drawpicture() {
		d = new drawingDesk();
		f.add(d,BorderLayout.CENTER);
		//设置JFrame的相关属性
		f.setSize(1200,1000);
		f.setTitle("图画工具--draw picture");
		f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		f.setVisible(true);
		f.setLocationRelativeTo(null);
//		this.setResizable(false);
//		this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	}

}
Testing.java代码
package test5;

public class Testing {
	public static void main(String[] args) {
		drawpicture cc=new drawpicture();
	}
}

运行结果

在这里插入图片描述

总结

目前只有图形选择，颜色选择功能，之后还会添加回撤、橡皮擦、线条厚度、线条类型等功能。

悦读

道可道，非常道；名可名，非常名。 无名，天地之始，有名，万物之母。 故常无欲，以观其妙，常有欲，以观其徼。 此两者，同出而异名，同谓之玄，玄之又玄，众妙之门。

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