Java实现的简单画图板示例

Java实现的简单画图板示例

本文实例讲述了java实现的简单画图板。分享给大家供大家参考，具体如下：

这个画图板是我好久之前做的，之后浙大的同学需要做课设然后就花了一点时间将它改了一下，变得简单些能够方便扩充功能，同时学习java基础

先截图一下吧，就可以知道有哪些功能了~

三个分区，上面选择图形，下面选择颜色，立体圆就是一个分形，也先放着不需要的同学可以注释了它

代码很简单，就是JPanel进行分区，得到画笔，同时使用画图的函数就可以做到了

贴代码应该很快就会了~

主类

package awtDemo;

import java.awt.BorderLayout;

import java.awt.Color;

import java.awt.Dimension;

import java.awt.FlowLayout;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JPanel;

@SuppressWarnings("serial")

public class DrawMain extends JPanel {

public static void main(String[] args) {

// TODO Auto-generated method stub

DrawMain Draw = new DrawMain();

Draw.InitUI();

}

public void InitUI() {

JFrame jf = new JFrame();

jf.setSize(1000, 780);

jf.setTitle("简单画板");

jf.setDefaultCloseOperation(3);

jf.setLocationRelativeTo(null);

jf.setLayout(new BorderLayout());

// 实例化事件监听类

DrawListener dl = new DrawListener(this);

// 实现中间面板

this.setBackground(Color.WHITE);

jf.add(this, BorderLayout.CENTER);

// 实现性状面板

JPanel ShapePanel = new JPanel();

ShapePanel.setBackground(Color.black);

ShapePanel.setLayout(new FlowLayout(FlowLayout.CENTER));

ShapePanel.setBackground(Color.gray);

;

String[] Shape = { "直线", "曲线", "圆", "喷枪", KsdrG"橡皮擦", "矩形", "椭圆", "圆角矩形",

"弧线", "多边形", "图形", "三角形", "立体圆", };

for (int i = 0; i < Shape.length; i++) {

JButton button = new JButton(Shape[i]);

button.setBackground(Color.WHITE);

button.addActionListener(dl); // 添加事件监听机制

ShapePanel.add(button);

}

jf.add(ShapePanel, BorderLayout.NORTH);

// 实现颜色面板

JPanel ColorPanel = new JPanel();

ColorPanel.setBackground(Color.black);

ColorPanel.setLayout(new FlowLayout(FlowLayout.CENTER));

ColorPanel.setBackground(Color.gray);

;

Color[] color = { Color.BLACK, Color.blue, Color.white, Color.gray,

Color.red, Color.CYAN, Color.green, Color.darkGray, Color.pink };

for (int i = 0; i < color.length; i++) {

JButton button = new JButton();

button.addActionListener(dl); // 添加事件监听机制

button.setPreferredSize(new Dimension(30, 30));

button.setBackground(color[i]);

ColorPanel.add(button);

}

jf.add(ColorPanel, BorderLayout.SOUTH);

jf.setVisible(true);

this.addMouseListener(dl);

this.addMouseMotionListener(dl);

}

}

监听辅助类

package awtDemo;

import java.awt.BasicStroke;

import java.awt.Color;

import java.awt.Graphics2D;

import java.awt.RenderingHints;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.awt.event.MouseAdapter;

import java.awt.event.MouseEvent;

import java.util.Random;

import javax.swing.JButton;

public class DrawListener extends MouseAdapter implements ActionListener {

private int x1, y1, x2, y2;

private int newx1, newy1, newx2, newy2;

private Graphics2D g;

private DrawMain df;

private boolean flag = false;

String shape = "直线";

Color color;

private int[] arrx = new int[4];

private int[] arry = new int[4];

private int temp = 0;

DrawListener(DrawMain d) {

df = d;

}

// 获取形状和颜色

public void actionPerformed(ActionEvent e) {

if (e.getActionCommand().equals("")) {

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

color = button.getBackground();

System.out.println("color = " + color);

} else {

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

shape = button.getActionCommand();

System.out.println("String = " + shape);

}

}

// 实现画笔

public void mousePressed(MouseEvent e) {

g = (Graphics2D) df.getGraphics();

g.setColor(color);

x1 = e.getX();

y1 = e.getY();

}

public void mouseReleased(MouseEvent e) {

x2 = e.getX();

y2 = e.getY();

if (shape.equals("直线")) {

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

} else if (shape.equals("弧线")) {

g.drawArc(x1, y1, Math.abs(x2 - x1), Math.abs(y2 - y1), 0, 180);

} else if (shape.equals("多边形") && !flag) {

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

newx1 = x1;

newy1 = y1;

newx2 = x2;

newy2 = y2;

flag = true;

} else if (shape.equals("圆")) {

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

} else if (shape.equals("矩形")) {

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

} else if (shape.equals("圆角矩形")) {

g.drawRoundRect(x1, y1, Math.abs(x2 - x1), Math.abs(y2 - y1), 2, 10);

} else if (shape.equals("椭圆")) {

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

}

}

public void mouseClicked(MouseEvent e) {

if (shape.equals("多边形") && flag) {

x2 = e.getX();

y2 = e.getY();

if (e.getClickCount() == 2) {

g.drawLine(newx1, newy1, newx2, newy2);

flag = false;

}

g.drawLine(newx2, newy2, x2, y2);

newx2 = x2;

newy2 = y2;

} else if (shape.equals("图形")) {

arrx[temp] = e.getX();

arry[temp] = e.getY();

temp++;

if (temp == 4) {

int x = arrx[3];

int y = arry[3];

for (int i = 0; i <= 10000; i++) {

Random ran = new Random();

int k = ran.nextInt(3);

x = (x + arrx[k]) / 2;

y = (y + arry[k]) / 2;

g.drawLine(x, y, x, y);

}

temp = 0;

}

} else if (shape.equals("立体圆")) {

// double a=-2,b=-2,c=-1.2,d=2;

double a = 1.40, b = 1.56, c = 1.40, d = -6.56;

KsdrG double x = 0, xo = 0;

double y = 0, yo = 0;

Color[] Col = { Color.BLUE, Color.cyan, Color.green, Color.magenta,

Color.red, Color.yellow };

for (int i = 0; i <= 90000; i++) {

Random r = new Random(); // 增加颜色

int R = r.nextInt(Col.length);

g.setColor(Col[R]);

// x=Math.sin(a*yo)-Math.cos(b*xo);

// y=Math.sin(c*xo)-Math.cos(d*yo);

x = d * Math.sin(a * xo) - Math.sin(b * yo);

y = c * Math.cos(a * xo) + Math.cos(b * yo);

int temp_x = (int) (x * 50);

int temp_y = (int) (y * 50);

g.drawLine(temp_x + 500, temp_y + 300, temp_x + 500,

temp_y + 300);

xo = x;

yo = y;

}

} else if (shape.equals("三角形")) {

double a = -2, b = -2, c = -1.2, d = 2;

double x = 0, xo = 0;

double y = 0, yo = 0;

Color[] Col = { Color.BLUE, Color.cyan, Color.green, Color.magenta,

Color.red, Color.yellow };

for (int i = 0; i <= 90000; i++) {

Random r = new RandoKsdrGm(); // 增加颜色

int R = r.nextInt(Col.length);

g.setColor(Col[R]);

x = Math.sin(a * yo) - Math.cos(b * xo);

y = Math.sin(c * xo) - Math.cos(d * yo);

int temp_x = (int) (x * 50);

int temp_y = (int) (y * 50);

g.drawLine(temp_x + 500, temp_y + 300, temp_x + 500,

temp_y + 300);

xo = x;

yo = y;

}

}

}

public void mouseDragged(MouseEvent e) {

x2 = e.getX();

y2 = e.getY();

if (shape.equals("曲线")) {

// g.setStroke(new BasicStroke(10));

// g.setRenderingHint(RenderingHints.KEY_ANTIALIASING,

// RenderingHints.VALUE_ANTIALIAS_ON);

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

x1 = x2;

y1 = y2;

} else if (shape.equals("橡皮擦")) {

g.setStroke(new BasicStroke(80));

g.setRenderingHint(RenderingHints.KEY_ANTIALIASING,

RenderingHints.VALUE_ANTIALIAS_ON);

g.setColor(Color.WHITE);

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

x1 = x2;

y1 = y2;

} else if (shape.equals("喷枪")) {

// g.setStroke(new BasicStroke(2)); //不用加粗

// g.setRenderingHint(RenderingHints.KEY_ANTIALIASING,

// RenderingHints.VALUE_ANTIALIAS_ON);

for (int k = 0; k < 20; k++) {

Random i = new Random();

int a = i.nextInt(8);

int b = i.nextInt(10);

g.drawLine(x2 + a, y2 + b, x2 + a, y2 + b);

}

}

}

}

代码量也还是挺小的，因为是简单画板嘛~~

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