计算机图形学—弹跳的球体

天涯流星雨 2013-09-05 08:26:51

发出来给大家分享一下......小白学习了java 2个月随便做的课程设计



package 计算机图形学;



/**

 * 球体类

 */

public class Ball {

	//球体上面的点

	int[][][] f=new int[11][21][2];

	

	//得到球体上面的点

	public int[][][] getF() {

		return f;

	}

	//得到球体上的点的二维坐标

	public Ball(double k) {

		int r=50;

		double emp = 3.14 / 10;

		for (int i = 0; i <=10; i++)

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

				//求出球体坐标系的x,y,z的值

				double x = Math

						.round(r * Math.sin(emp * i) * Math.cos(emp * j));

				double y = Math

						.round(r * Math.sin(emp * i) * Math.sin(emp * j));

				double z = Math.round(r * Math.cos(emp * i));

				

				//三维坐标转化成二维坐标

				y=Math.round( Math.sqrt(1)/2*y-z);

				

				//旋转球体（k为弧度）

				f[i][j][0] = (int) (x*Math.cos(k)-y*Math.sin(k));

				f[i][j][1] = (int) (x*Math.sin(k)+y*Math.cos(k));

			}

	}

}

package 计算机图形学;



import java.awt.Color;

import java.awt.Font;

import java.awt.Graphics;

import java.awt.Image;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.awt.event.KeyAdapter;

import java.awt.event.KeyEvent;

import java.util.ArrayList;

import java.util.Random;



import javax.swing.JFrame;

import javax.swing.Timer;



/**

 *球体的显示窗口 

 */

public class BallFrame extends JFrame{

	// π的弧度=PI

	private final double PI=Math.toRadians(180);

	// 下落的高度

	int h;

	//球体的水平，垂直方向移动的距离

	int x,y;

	//定时器让球体定时移动

	Timer time;

	//球体旋转的角度

	int style=0;

	

	public BallFrame() {

		init();

		setVisible(true);

	}



	private void init() {

		this.setSize(800, 600);

		this.setResizable(false);

		this.setLocationRelativeTo(null);

		this.setLayout(null);

		this.setDefaultCloseOperation(EXIT_ON_CLOSE);

		this.setTitle("弹跳的球体");

		

		initListener();

		restart();

	}

	

	/**

	 * 键盘事件响应

	 */

	private void initListener() {

		this.addKeyListener(new KeyAdapter(){

			

			public void keyPressed(KeyEvent arg) {

				if ( arg.getKeyCode()==KeyEvent.VK_ESCAPE){

					time.stop();

					time=null;

					restart();

				}else{

					if (time==null){

						initTime();

						time.start();

					}

				}

				if ( arg.getKeyCode()==KeyEvent.VK_UP ){

					if (time!=null){

						int t=time.getDelay()-10;

						if (t>0){

							time.setDelay(t);

						}

					}

				}else if ( arg.getKeyCode()==KeyEvent.VK_DOWN ){

					if (time!=null){

						int t=time.getDelay()+10;

						time.setDelay(t);

					}

				}

			}

		});

	}

	

	/**

	 * 创建定时器，并进行监听

	 */

	private void initTime(){

		

		time=new Timer(200, new ActionListener() {

			public void actionPerformed(ActionEvent e) {

				x+=1;

				y=(int)( h* Math.abs( Math.sin(2*PI/300*x)) );

				repaint();

				if (-1<y && y<1){

					if (h>0) { 

						h=h-100;

					}else h=0;

				}

				if (x>700) {

					BallFrame.this.time.stop();

				}

				BallFrame.this.requestFocus();

			}

		});

	}

	/**

	 *画球 

	 */

	private void drawBall(Graphics g){

		g.setColor(Color.GREEN);



		double k=Math.toRadians( 5*(style) );

		int[][][] f=new Ball(k).getF();

		style=(++style)%36;

		

		int x0=this.x,y0=500-this.y;



		for (int i=0;i<=10;i++)

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

				if (i<10){

					g.drawLine(f[i][j][0]+x0,f[i][j][1]+y0 , f[i+1][j][0]+x0, f[i+1][j][1]+y0);

				}

				

				if (j<20){

					g.drawLine(f[i][j][0]+x0,f[i][j][1]+y0, f[i][j+1][0]+x0, f[i][j+1][1]+y0);

				}

			}

	}

	/**

	 * 双缓冲画图

	 */

	public void paint(Graphics g) {

		Image img=createImage(800, 600);

		Graphics i=img.getGraphics();

		

		i.setColor(Color.PINK);

		i.fillRect(0, 0, 800, 500);

		i.setColor(Color.YELLOW);

		i.fillRect(0, 500, 800, 100);

		i.setColor(Color.BLACK);

		

		i.setFont(new Font("宋体", Font.BOLD, 18));

		if (time==null){

			i.drawString("按任意键开始", 100, 70);

		}else {

			i.drawString("按ESC键结束", 100, 70);

		}

		

		i.drawString("按↑加快移动速度", 500, 50);

		i.drawString("按↓减慢移动速度。", 500, 80);

		

		drawBall(i);

		g.drawImage(img, 0,0,null);

	}

	

	public void update(Graphics g) {

		paint(g);

	}

	/**

	 * 重新开始

	 */

	public void restart(){

		h=400;

		x=100;

		y=(int)( h* Math.abs( Math.sin(2*PI/300*x)) );

		

		repaint();

		

	}

	public static void main(String[] args) {

		new BallFrame();

	}

	

}