学以致用——Java源码——使用Graphics2D类draw方法绘制立方体（Drawing Cubes）

程序功能：

使用Graphics2D类draw方法绘制立方体

运行示例：

源码：

1. 实体类

import java.awt.Graphics2D;
import java.awt.Polygon;
import java.awt.geom.GeneralPath;
import java.security.SecureRandom;import javax.swing.JPanel;
import java.awt.Color;
import java.awt.Graphics;/*** 13.16 (Drawing Cubes) Write an application that draws a cube. Use class* GeneralPath and method draw of class Graphics2D.* * @author Pandenghuang@163.com* @Date Jan 22, 2019, 1:44:03 PM**/
public class CubeJPanel extends JPanel
{final SecureRandom rn = new SecureRandom();public void paint(Graphics g){Graphics2D g2d = (Graphics2D) g;    super.paintComponents(g);int width = getWidth(); // total width   int height = getHeight(); // total heightint rRed;int rGreen;int rBlue;int length = width/3; //边长随窗体尺寸增大而增大int aX = width/2 - length/2;int aY = height/2 - length/2;//定义一个正方体int cubeCordinates[][] =  new int[2][7]; //保存正方体的7个点（另一点作图时用不到）cubeCordinates[0][0] = aX;   //A点X坐标cubeCordinates[0][1] = aX + length;    //B点X坐标cubeCordinates[0][2] = aX + length;    //C点X坐标cubeCordinates[0][3] = aX;  //D点X坐标cubeCordinates[0][4] = (int) (aX + 1.5*length);    //E点X坐标cubeCordinates[0][5] = (int) (aX + 0.5*length);    //F点X坐标cubeCordinates[0][6] = (int) (aX + 1.5*length);    //G点X坐标cubeCordinates[1][0] = aY;  //A点Y坐标cubeCordinates[1][1] = aY;  //B点Y坐标cubeCordinates[1][2] = aY + length;    //C点Y坐标cubeCordinates[1][3] = aY + length;    //D点Y坐标cubeCordinates[1][4] = (int) (aY - 0.3 * length);   //E点X坐标cubeCordinates[1][5] = (int) (aY - 0.3 * length);   //F点X坐标cubeCordinates[1][6] = (int) (aY + 0.7 * length);  //G点X坐标int cubeSquareCordinates[][][] =  new int[3][2][4]; //保存正方体的7个点构成的三个面，用于绘制该正方体//正面由ABCD四个点构成for (int i=0; i<2; i++)for (int j=0; j<4; j++) {cubeSquareCordinates[0][i][i] = cubeCordinates[i][j];   //A点X坐标}cubeSquareCordinates[0][0][0] = cubeCordinates[0][0];  //A点X坐标cubeSquareCordinates[0][0][1] = cubeCordinates[0][1];   //B点X坐标cubeSquareCordinates[0][0][2] = cubeCordinates[0][2];   //C点X坐标cubeSquareCordinates[0][0][3] = cubeCordinates[0][3];   //D点X坐标cubeSquareCordinates[0][1][0] = cubeCordinates[1][0];   //A点Y坐标cubeSquareCordinates[0][1][1] = cubeCordinates[1][1];   //B点Y坐标cubeSquareCordinates[0][1][2] = cubeCordinates[1][2];   //C点Y坐标cubeSquareCordinates[0][1][3] = cubeCordinates[1][3];   //D点Y坐标//右侧面由BCGE四个点构成cubeSquareCordinates[1][0][0] = cubeCordinates[0][1];    //B点X坐标cubeSquareCordinates[1][0][1] = cubeCordinates[0][2];   //C点X坐标cubeSquareCordinates[1][0][2] = cubeCordinates[0][6];   //G点X坐标cubeSquareCordinates[1][0][3] = cubeCordinates[0][4];   //E点X坐标cubeSquareCordinates[1][1][0] = cubeCordinates[1][1];   //B点Y坐标cubeSquareCordinates[1][1][1] = cubeCordinates[1][2];   //C点Y坐标cubeSquareCordinates[1][1][2] = cubeCordinates[1][6];   //G点Y坐标cubeSquareCordinates[1][1][3] = cubeCordinates[1][4];   //E点Y坐标//上面由ABEF四个点构成cubeSquareCordinates[2][0][0] = cubeCordinates[0][0];     //A点X坐标cubeSquareCordinates[2][0][1] = cubeCordinates[0][1];   //B点X坐标cubeSquareCordinates[2][0][2] = cubeCordinates[0][4];   //E点X坐标cubeSquareCordinates[2][0][3] = cubeCordinates[0][5];   //F点X坐标cubeSquareCordinates[2][1][0] = cubeCordinates[1][0];   //A点Y坐标cubeSquareCordinates[2][1][1] = cubeCordinates[1][1];   //B点Y坐标cubeSquareCordinates[2][1][2] = cubeCordinates[1][4];   //E点Y坐标cubeSquareCordinates[2][1][3] = cubeCordinates[1][5];   //F点Y坐标//绘制该正方体for (int i = 2; i >= 0;i--){//Color represented in RGB moderRed = rn.nextInt(256);rGreen = rn.nextInt(256);rBlue = rn.nextInt(256);Color color=new Color(rRed, rGreen, rBlue);g2d.setColor(color);g2d.fill(new GeneralPath(new Polygon(cubeSquareCordinates[i][0],cubeSquareCordinates[i][1],4)));}    }}

2. 测试类

import java.awt.BorderLayout;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionAdapter;
import javax.swing.JFrame;
import javax.swing.JTextArea;public class DrawCube {static JTextArea statusBar = new JTextArea();public static void main(String[] args){// create a panel that contains our drawingCubeJPanel panel = new CubeJPanel();MouseHandler handler = new MouseHandler(); panel.addMouseMotionListener(handler);// create a new frame to hold the panelJFrame application = new JFrame();application.setTitle("绘制正方体");// set the frame to exit when it is closedapplication.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);application.add(panel,BorderLayout.CENTER); // add the panel to the frameapplication.add(statusBar,BorderLayout.SOUTH); // add the statusBar to the frameapplication.setSize(460, 360); // set the size of the frameapplication.setVisible(true); // make the frame visible    } static class MouseHandler extends  MouseMotionAdapter {// handle event when mouse enters area@Overridepublic void mouseMoved(MouseEvent event){  statusBar.setText(String.format("光标当前坐标：[%d, %d]", event.getX(), event.getY()));;}}}

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学以致用——Java源码——使用Graphics2D类draw方法绘制立方体（Drawing Cubes）

程序功能：

运行示例：

源码：

学以致用——Java源码——使用Graphics2D类draw方法绘制立方体（Drawing Cubes）相关推荐

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