Swing图形绘制（长方形、椭圆、同心圆及直方图）

来源：互联网发布：matlab元胞转化为矩阵编辑：程序博客网时间：2024/06/07 12:11

感觉自己的图形分析有待增强啊，还达不到想什么就能画什么的程度。

代码如下：

ackage example;import java.awt.Graphics;//Fig. 5.27: ShapesTest.java, modified by pandenghuang@163.com//Test application that displays class Shapes.import javax.swing.JFrame;import javax.swing.JOptionPane;import javax.swing.JPanel;import java.awt.Graphics; //handle the displaypublic class ShapesTest{public static class Shapes extends JPanel{private int choice; // user's choice of which shape to draw// constructor sets the user's choicepublic Shapes(int userChoice){   choice = userChoice;} // draws a cascade of shapes starting from the top-left cornerpublic void paintComponent(Graphics g){   super.paintComponent(g);   int width = getWidth(); // total width      int height = getHeight(); // total height   int barHorizontalDistance=width/11;   int barVerticalDistance=height/11;      for (int i = 0; i < 10; i++)   {      // pick the shape based on the user's choice      switch (choice)      {         case 1: // draw rectangles            g.drawRect(10 + i * 10, 10 + i * 10,                50 + i * 10, 50 + i * 10);            break;         case 2: // draw ovals            g.drawOval(10 + i * 10, 10 + i * 10,                50 + i * 10, 50 + i * 10);            break;         case 3: // draw concentric circles             g.drawOval(width/2-(i+1)*10, height/2-(i+1)*10,              10+20*i,  10+20*i);             break;         case 4: // draw bar chart             g.drawRect(i * barHorizontalDistance, height - i * barVerticalDistance,                 20, height + i * height/11);             break;      }    } } } public static void main(String[] args){   // obtain user's choice   String input = JOptionPane.showInputDialog(      "输入1画长方形\n" +      "输入2画圆形\n"+  "输入3画同心圆\n"+  "输入4画条形图");      int choice = Integer.parseInt(input); // convert input to int      // create the panel with the user's input   Shapes panel = new Shapes(choice);      JFrame application = new JFrame(); // creates a new JFrame   application.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);   application.add(panel);    application.setSize(300, 300);    application.setVisible(true); }} // end class ShapesTest

运行截屏：

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