如何使用Java实现画图板-创新互联
这篇文章主要介绍了如何使用Java实现画图板,具有一定借鉴价值,感兴趣的朋友可以参考下,希望大家阅读完这篇文章之后大有收获,下面让小编带着大家一起了解一下。
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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", "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; 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 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); 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); } } } }
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