科赫再来。。闲言碎语

   这几天一直很忙，申请创新项目，撰写数学建模报告，上亚历山大的各种课。。。。

但程序一直在写，但是成果不大，而且有几个技术难关还没有攻破，但那些都不是事，

今天早上有点时间去图书馆，去了好好的再写了一下双向链表，及双向链表的优化，

还有好好地改进了科赫曲线和雪花的实现，拒绝自己以前的暴力实现，

成功的使用了递归，而且加入了组件来调整颜色和线条的粗细。。。具体代码解释如下：

import java.awt.BasicStroke;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.Graphics2D;
import java.awt.Toolkit;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;import javax.swing.ButtonGroup;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
import javax.swing.JSlider;
import javax.swing.border.SoftBevelBorder;
/*** 绘制科赫曲线以及科赫雪花* @author LONG 2013-03-24**/
public class Snow extends JFrame {private static final long serialVersionUID = 1L;private static final double PI = Math.PI;//定义全局变量PIprivate Dimension di = null;		//定义全局变量private Graphics2D gr = null;		//定义为这样便于后面更改线条粗细private JPanel jp_draw = null;		//定义绘画的面板private double angle = 0.0;		//记录传入直线的角度private int count = 0;			//创建计数器变量，用来记录鼠标点击的次数，即递归次数private JSlider js_red = null;		//定义用来改变颜色和粗细的拉杆private JSlider js_blue = null;private JSlider js_green = null;private double apha = PI/3;				private JRadioButton jr_kehe = null;private JRadioButton jr_snow = null;private ButtonGroup bg = null;		//定义按钮组private JSlider js_stroke = null;/*** 程序入口* @param args*/public static void main(String[] args){Snow sh = new Snow();sh.showFrame();}public void showFrame(){this.setTitle("科赫曲线");Toolkit tl = Toolkit.getDefaultToolkit();	//得到系统工具di = tl.getScreenSize();						//得到屏幕尺寸this.setSize(di.width,di.height);this.setDefaultCloseOperation(3);jp_draw = new JPanel();jp_draw.setPreferredSize(new Dimension(di.width*3/4,di.height));//设置画布的大小this.add(jp_draw,BorderLayout.WEST);	//设置画布位置this.setResizable(false);jp_draw.setBackground(Color.WHITE);JLabel jl_red = new JLabel("红色");	//如下三个是用于调整参数的js_red = new JSlider();JLabel jl_blue = new JLabel("蓝色");js_blue = new JSlider();JLabel jl_green = new JLabel("绿色");js_green = new JSlider();JLabel jl_stroke = new JLabel("粗细");js_stroke = new JSlider();js_stroke.setValue(2);			//将初始粗细设为2js_stroke.setMaximum(12);js_red.setMaximum(255);			//设置三个拉杆的最大值js_blue.setMaximum(255);js_green.setMaximum(255);JButton jb_ok = new JButton("开始");//定义按钮用来改变递归的深度和初始化递归的深度JButton jb_reset = new JButton("重置");jb_ok.setPreferredSize(new Dimension(180,40));jb_reset.setPreferredSize(new Dimension(180,40));JPanel jp_b = new JPanel();		//定义存放组件的面板this.add(jp_b,BorderLayout.CENTER);jp_b.setBorder(new SoftBevelBorder(0));jp_b.add(js_red);jp_b.add(jl_red);jp_b.add(js_blue);jp_b.add(jl_blue);jp_b.add(js_green);jp_b.add(jl_green);jp_b.add(js_stroke);jp_b.add(jl_stroke);jr_kehe = new JRadioButton("科赫曲线",true);jr_kehe.setActionCommand("kehe");jr_snow = new JRadioButton("科赫雪花",false);jr_snow.setActionCommand("snow");bg = new ButtonGroup();bg.add(jr_kehe);bg.add(jr_snow);JPanel jp = new JPanel();	//定义存放按钮及选项按钮jp.setPreferredSize(new Dimension(200,250));jp_b.add(jp);FlowLayout fl = new FlowLayout();jp.setLayout(fl);fl.setVgap(40);jp.add(jr_kehe);jp.add(jr_snow);jp.add(jb_ok);JPanel jp_reset = new JPanel();jp_b.add(jp_reset);jp_reset.add(jb_reset);this.setVisible(true);gr = (Graphics2D) jp_draw.getGraphics();jb_ok.addMouseListener(new MouseAdapter(){	//给增加递归深度的按钮添加监听器public void mousePressed(MouseEvent e){repaint();count++;}public void mouseReleased(MouseEvent e){init();}});jb_reset.addMouseListener(new MouseAdapter(){	//给重置按钮添加监听器public void mousePressed(MouseEvent e){repaint();count = 0;		//将递归深度设为0}public void mouseReleased(MouseEvent e){init();			//执行初始化，并画图}});js_red.addMouseMotionListener(new MouseAdapter(){//如下三个均是给拉杆添加监听器，使得颜色随着拉杆改变public void mouseDragged(MouseEvent e){init();}});js_blue.addMouseMotionListener(new MouseAdapter(){public void mouseDragged(MouseEvent e){init();}});js_green.addMouseMotionListener(new MouseAdapter(){public void mouseDragged(MouseEvent e){init();}});js_stroke.addMouseMotionListener(new MouseAdapter(){//给粗细添加监听器public void mouseDragged(MouseEvent e){init();}});}/*** 执行初始化的函数，得到拉杆上的值来设置参数大小*/public void init(){int red = js_red.getValue();int blue = js_blue.getValue();int green = js_green.getValue();int stroke = js_stroke.getValue();gr.setStroke(new BasicStroke((float)stroke));gr.setColor(new Color(red,green,blue));draw();	//调用画的函数}public void draw(){double x1 = jp_draw.getWidth()/4;double y1 = jp_draw.getHeight()/4;double x2 = jp_draw.getWidth()*3/4;double y2 = jp_draw.getHeight()/4;double x3 = (x1 + x2)/2;	//用于计算科赫雪花中会用到的第三个点的x坐标double y3 = y1 + (x2 - x1)*Math.sqrt(3)/2;//用于计算科赫雪花会用到的第三个点的y坐标String command = bg.getSelection().getActionCommand();if(command.equals("kehe")){	 //如果选择科赫曲线则执行，否则执行画出科赫雪花的过程drawKehe(x1,y1,x2,y2,count);}else{		drawKehe(x1,y1,x2,y2,count);drawKehe(x2,y2,x3,y3,count);drawKehe(x3,y3,x1,y1,count);}}/*** 测试只做一次递归* @param x1	传入的起始点* @param y1* @param x2	传入的终点* @param y2* @param deepth	用做递归的深度*/public void drawKehe(double x1,double y1,double x2,double y2,int deepth){if(deepth > 0){//得到三分点的坐标double length = Math.sqrt(Math.pow(y2 - y1, 2) + Math.pow(x2 - x1, 2));double sx_1 = x1 + (x2 - x1)/3;	//第一个三分点的x坐标double sy_1 = y1 + (y2 - y1)/3;	//第一个三分点的y坐标double sx_2 = x2 - (x2 - x1)/3;	//第二个三分点的x坐标double sy_2 = y2 - (y2 - y1)/3;	//第二个三分点的y坐标if(sx_2 - sx_1 == 0 ){angle = PI/2;}else{angle = Math.atan((sy_2 - sy_1)/(sx_2 - sx_1));	//得到此时准备画的边的角度}if(angle >= 0 && (sx_2 - sx_1) < 0 || angle <= 0 && (sx_2 - sx_1) < 0){//因为反正切的值范围在-PI/2到PI/2之间，所以根据位置旋转angle += PI;}double sx_3 = sx_1 + Math.cos(angle - apha) * length/3;	//算出第三个点的坐标double sy_3 = sy_1 + Math.sin(angle - apha) * length/3;drawKehe(x1,y1,sx_1,sy_1,deepth - 1);		//以下四个用于递归drawKehe(sx_1,sy_1,sx_3,sy_3,deepth - 1);drawKehe(sx_3,sy_3,sx_2,sy_2,deepth - 1);drawKehe(sx_2,sy_2,x2,y2,deepth - 1);}else{gr.drawLine((int)x1, (int)y1, (int)x2, (int)y2);	//执行划线功能}	}
}

 代码就是上面那么多，但是呢，就是我也感觉太长了，

我看起来烦，但是如果对于诸君有用呢，那是我最大的欢乐了。。。嘻嘻

啥话不说，上几张图瞧瞧结果哈！

如上所示是各种图片。预览有点问题，大家可以在附件看一下。。。。嘻嘻