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第8章 3D基本形状/BezierEx/.classpath

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+<?xml version="1.0" encoding="UTF-8"?>
+<classpath>
+	<classpathentry kind="src" path="src"/>
+	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.6"/>
+	<classpathentry kind="output" path="bin"/>
+</classpath>

第8章 3D基本形状/BezierEx/.project

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+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>BezierExC</name>
+	<comment></comment>
+	<projects>
+	</projects>
+	<buildSpec>
+		<buildCommand>
+			<name>org.eclipse.jdt.core.javabuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+	</buildSpec>
+	<natures>
+		<nature>org.eclipse.jdt.core.javanature</nature>
+	</natures>
+</projectDescription>

第8章 3D基本形状/BezierEx/.settings/org.eclipse.jdt.core.prefs

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+#Fri Jun 24 15:22:54 CST 2011
+eclipse.preferences.version=1
+org.eclipse.jdt.core.compiler.codegen.inlineJsrBytecode=enabled
+org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.6
+org.eclipse.jdt.core.compiler.codegen.unusedLocal=preserve
+org.eclipse.jdt.core.compiler.compliance=1.6
+org.eclipse.jdt.core.compiler.debug.lineNumber=generate
+org.eclipse.jdt.core.compiler.debug.localVariable=generate
+org.eclipse.jdt.core.compiler.debug.sourceFile=generate
+org.eclipse.jdt.core.compiler.problem.assertIdentifier=error
+org.eclipse.jdt.core.compiler.problem.enumIdentifier=error
+org.eclipse.jdt.core.compiler.source=1.6

第8章 3D基本形状/BezierEx/src/com/bn/bezier/BNPosition.java

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+package com.bn.bezier;
+
+//贝塞尔曲线上点的类
+
+public class BNPosition 
+{
+   int x;
+   int y;
+   
+   public BNPosition(float x,float y)	
+   {
+	   this.x=(int) x;
+	   this.y=(int) y;
+   }
+}

第8章 3D基本形状/BezierEx/src/com/bn/bezier/BezierExMain.java

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+package com.bn.bezier;
+import java.awt.event.ActionEvent;
+import java.awt.event.ActionListener;
+import javax.swing.JButton;
+import javax.swing.JCheckBox;
+import javax.swing.JFrame;
+import javax.swing.JLabel;
+import javax.swing.JScrollPane;
+import javax.swing.JSpinner;
+import javax.swing.JTextArea;
+import javax.swing.SpinnerNumberModel;
+import javax.swing.event.ChangeEvent;
+import javax.swing.event.ChangeListener;
+
+@SuppressWarnings("serial")
+public class BezierExMain extends JFrame
+{
+   public static void main(String args[])
+   {
+	   new BezierExMain();
+   }
+   
+   MyPanel mp;
+   JLabel jlfd=new JLabel("分段");   
+   JSpinner jspfd;
+   JLabel jlbj=new JLabel("步进");   
+   JSpinner jspbj;
+   JButton jbClear=new JButton("清空");
+   JButton jbFlush=new JButton("删除尾");
+   JButton jbLeft=new JButton("<-左移");
+   JButton jbRight=new JButton("右移->");
+   JButton jbUp=new JButton("上移");
+   JButton jbDown=new JButton("下移");
+   JTextArea jta=new  JTextArea();
+   JScrollPane jsp=new JScrollPane(jta);
+   JCheckBox jcb =new JCheckBox("显示控制点");
+   public BezierExMain()
+   {
+	   this.setTitle("Bezier曲线工具");
+	   this.setLayout(null);
+	   
+	   mp=new MyPanel(this);
+	   mp.setBounds(10,10,400,Constant.HEIGHT);
+	   this.add(mp);
+	   
+	   jcb.setBounds(415,10,90,20);
+	   this.add(jcb);
+	   jcb.setSelected(true);
+	   jcb.addChangeListener
+	   (
+		   new ChangeListener()
+		   {
+			@Override
+			public void stateChanged(ChangeEvent arg0) 
+			{
+				Constant.XSKZD=jcb.isSelected();
+				mp.repaint();
+			}			   
+		   }
+	   );
+	   
+	   jlfd.setBounds(420,40,50,20);
+	   this.add(jlfd);	  	   
+	   
+	   Integer value = new Integer(20); 
+	   Integer min = new Integer(0);
+	   Integer max = new Integer(100); 
+	   Integer step = new Integer(1); 
+	   SpinnerNumberModel model = new SpinnerNumberModel(value, min, max, step); 
+	   jspfd=new JSpinner(model);
+	   jspfd.setBounds(450,40,50,20);
+	   this.add(jspfd);
+	   jspfd.addChangeListener
+	   (
+         new ChangeListener()
+         {
+			@Override
+			public void stateChanged(ChangeEvent arg0) 
+			{
+				Constant.FD=(Integer)jspfd.getValue();
+				mp.repaint();
+			}        	 
+         }
+	   );
+	   
+	   jbClear.setBounds(420,70,80,20);
+	   this.add(jbClear);
+	   jbClear.addActionListener
+	   (
+		    new ActionListener()
+		    {
+				@Override
+				public void actionPerformed(ActionEvent arg0) 
+				{
+					BezierUtil.al.clear();
+					mp.repaint();
+				}		    	
+		    }
+	   );
+	   
+	   jbFlush.setBounds(420,100,80,20);
+	   this.add(jbFlush);
+	   jbFlush.addActionListener
+	   (
+		    new ActionListener()
+		    {
+				@Override
+				public void actionPerformed(ActionEvent arg0) 
+				{
+					BezierUtil.al.remove(BezierUtil.al.size()-1);
+					mp.repaint();
+				}		    	
+		    }
+	   );
+	   
+	   jlbj.setBounds(420,130,50,20);
+	   this.add(jlbj);
+	   value = new Integer(1); 
+	   min = new Integer(1);
+	   max = new Integer(20); 
+	   step = new Integer(1);
+	   model = new SpinnerNumberModel(value, min, max, step); 
+	   jspbj=new JSpinner(model);
+	   jspbj.setBounds(450,130,50,20);
+	   this.add(jspbj);
+	   jspbj.addChangeListener
+	   (
+         new ChangeListener()
+         {
+			@Override
+			public void stateChanged(ChangeEvent arg0) 
+			{
+				Constant.ZYBJ=(Integer)jspbj.getValue();
+				mp.repaint();
+			}        	 
+         }
+	   );
+	   
+	   jbLeft.setBounds(420,160,80,20);
+	   this.add(jbLeft);
+	   jbLeft.addActionListener
+	   (
+		    new ActionListener()
+		    {
+				@Override
+				public void actionPerformed(ActionEvent arg0) 
+				{
+					for(BNPosition bnp:BezierUtil.al)
+					{
+						bnp.x-=Constant.ZYBJ;
+					}
+					mp.repaint();
+				}		    	
+		    }
+	   );
+	   
+	   jbRight.setBounds(420,190,80,20);
+	   this.add(jbRight);
+	   jbRight.addActionListener
+	   (
+		    new ActionListener()
+		    {
+				@Override
+				public void actionPerformed(ActionEvent arg0) 
+				{
+					for(BNPosition bnp:BezierUtil.al)
+					{
+						bnp.x+=Constant.ZYBJ;
+					}
+					mp.repaint();
+				}		    	
+		    }
+	   );
+	   
+	   jbUp.setBounds(420,220,80,20);
+	   this.add(jbUp);
+	   jbUp.addActionListener
+	   (
+		    new ActionListener()
+		    {
+				@Override
+				public void actionPerformed(ActionEvent arg0) 
+				{
+					for(BNPosition bnp:BezierUtil.al)
+					{
+						bnp.y+=Constant.ZYBJ;
+					}
+					mp.repaint();
+				}		    	
+		    }
+	   );
+	   
+	   jbDown.setBounds(420,250,80,20);
+	   this.add(jbDown);
+	   jbDown.addActionListener
+	   (
+		    new ActionListener()
+		    {
+				@Override
+				public void actionPerformed(ActionEvent arg0) 
+				{
+					for(BNPosition bnp:BezierUtil.al)
+					{
+						bnp.y-=Constant.ZYBJ;
+					}
+					mp.repaint();
+				}		    	
+		    }
+	   );
+	   
+	   jsp.setBounds(510,10,210,360);
+	   this.add(jsp);
+	   
+	   this.setBounds(10,10,730,400);
+	   this.setVisible(true);
+	   this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+	  
+	   mp.requestFocus();
+   }
+}

第8章 3D基本形状/BezierEx/src/com/bn/bezier/BezierUtil.java

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+package com.bn.bezier;
+
+import java.util.ArrayList;
+
+public class BezierUtil 
+{
+   static ArrayList<BNPosition> al=new ArrayList<BNPosition>();	//贝塞尔曲线基于的点的列表
+   
+   public static ArrayList<BNPosition> getBezierData(float span)//求贝塞尔曲线上点的类
+   {
+	   ArrayList<BNPosition> result=new ArrayList<BNPosition>(); //存放贝塞尔曲线上点的结果列表
+	   
+	   int n=al.size()-1;	
+	   
+	   if(n<1)	//基于的点的数少于1，无贝塞尔曲线
+	   {
+		   return result;
+	   }
+	   
+	   int steps=(int) (1.0f/span);	//总得步进数
+	   long[] jiechengNA=new long[n+1];	//声明一个长度为n+1的阶乘数组
+	   
+	   for(int i=0;i<=n;i++){	//求0到n的阶乘
+		   jiechengNA[i]=jiecheng(i);
+	   }
+	   
+	   for(int i=0;i<=steps;i++)
+	   {
+		   float t=i*span;
+		   if(t>1)		//t的值在0-1之间
+		   {
+			   t=1;
+		   }
+		   float xf=0;
+		   float yf=0;
+		   
+		   float[] tka=new float[n+1];
+		   float[] otka=new float[n+1];
+		   for(int j=0;j<=n;j++)
+		   {
+			   tka[j]=(float) Math.pow(t, j); //计算t的j次幂
+			   otka[j]=(float) Math.pow(1-t, j); //计算1-t的j次幂
+		   }
+		   
+		   for(int k=0;k<=n;k++)
+		   {
+			   float xs=(jiechengNA[n]/(jiechengNA[k]*jiechengNA[n-k]))*tka[k]*otka[n-k];
+			   xf=xf+al.get(k).x*xs;
+			   yf=yf+al.get(k).y*xs;
+		   }
+		   result.add(new BNPosition(xf,yf));
+	   }
+	   
+	   return result;
+   }
+   
+   //求阶乘的方法
+   public  static long jiecheng(int n){
+	   long result=1;	//声明一个long型的变量
+	   if(n==0)			//0的阶乘为1
+	   {
+		   return 1;
+	   }
+	   
+	   for(int i=2;i<=n;i++){	//求大于等于2的数的阶乘
+		   result=result*i;
+	   }
+	   
+	   return result;	//返回结果
+   }
+}

第8章 3D基本形状/BezierEx/src/com/bn/bezier/Constant.java

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+package com.bn.bezier;
+
+public class Constant 
+{
+   public static int HEIGHT=350;
+   public static int FD=20;//分段
+   public static int ZYBJ=1;//左移步进
+   public static boolean XSKZD=true;//是否显示控制点
+}

第8章 3D基本形状/BezierEx/src/com/bn/bezier/MyPanel.java

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+package com.bn.bezier;
+
+import java.awt.Color;
+import java.awt.Graphics;
+import java.awt.event.MouseEvent;
+import java.awt.event.MouseListener;
+import java.awt.event.MouseMotionListener;
+import java.util.ArrayList;
+
+import javax.swing.JPanel;
+
+@SuppressWarnings("serial")
+public class MyPanel extends JPanel implements MouseListener,MouseMotionListener
+{
+	BezierExMain father;
+	
+	public MyPanel(BezierExMain father)
+	{
+		this.father=father;
+		this.addMouseListener(this);
+		this.addMouseMotionListener(this);
+	}
+	
+    public void paint(Graphics g)
+    {
+    	g.setColor(new Color(0,0,0));	//黑色背景
+    	
+    	
+    	g.fillRect(0, 0, 1000, 1000);    	
+    	
+    	father.jta.setText("以下为控制点列表：\n");    	
+    	father.jta.append("  x\t  y\n"); 
+    	for(int i=0;i<BezierUtil.al.size()-1;i++)
+    	{
+    		BNPosition start=BezierUtil.al.get(i);
+    		BNPosition end=BezierUtil.al.get(i+1);    		
+    		if(Constant.XSKZD)
+    		{
+    			g.setColor(new Color(255,0,255));
+    			
+    			
+    			g.drawLine(start.x, Constant.HEIGHT-start.y, end.x, Constant.HEIGHT-end.y);
+    			
+    			g.setColor(new Color(255,255,255));
+        		
+    			
+    			g.drawRect(start.x-3, Constant.HEIGHT-start.y-3, 7, 7);
+    		}    		
+    		father.jta.append(start.x+"\t"+start.y+"\n"); 
+    		
+    	}
+    	if(BezierUtil.al.size()>0)
+    	{
+    		BNPosition yilou=BezierUtil.al.get(BezierUtil.al.size()-1);
+        	father.jta.append(yilou.x+"\t"+yilou.y+"\n");
+        	if(Constant.XSKZD)
+    		{
+	        	g.setColor(new Color(255,255,255));
+	        	
+	    		g.drawRect(yilou.x-3, Constant.HEIGHT-yilou.y-3, 7, 7);
+    		}
+    	}
+    	father.jta.append("=========================\n"); 
+    	father.jta.append("以下为Bezier曲线中点列表(分段"+Constant.FD+")：\n"); 
+    	father.jta.append("  x\t  y\n"); 
+    	g.setColor(new Color(0,255,0));    	
+    	
+    	
+    	ArrayList<BNPosition> list=BezierUtil.getBezierData(1.0f/Constant.FD);
+    	for(int i=0;i<list.size()-1;i++)
+    	{
+    		BNPosition start=list.get(i);
+    		BNPosition end=list.get(i+1);
+    		g.drawLine(start.x, Constant.HEIGHT-start.y, end.x, Constant.HEIGHT-end.y);
+    		father.jta.append(start.x+"\t"+start.y+"\n"); 
+    	}
+    	if(list.size()>0)
+    	{
+    		BNPosition yilou=list.get(list.size()-1);
+        	father.jta.append(yilou.x+"\t"+yilou.y+"\n");
+    	}
+    	father.jta.append("=========================\n"); 
+    	father.jta.append("以下为自动生成的代码：\n");
+    	father.jta.append("//加入数据点\n");
+    	for(BNPosition pos:BezierUtil.al)
+    	{
+    		father.jta.append("BezierUtil.al.add(new BNPosition("+pos.x+", "+pos.y+"));\n");
+    	}
+    	father.jta.setCaretPosition(0);
+    }
+
+    int state=0;//0-初始态  1-抓住
+    int currIndex=-1;
+	@Override
+	public void mouseClicked(MouseEvent arg0) 
+	{
+    	
+	}
+
+	@Override
+	public void mouseEntered(MouseEvent arg0){}
+
+	@Override
+	public void mouseExited(MouseEvent arg0) {}
+
+	@Override
+	public void mousePressed(MouseEvent arg0)
+	{
+		int x=arg0.getX();
+		int y=arg0.getY();
+		//判断有没有按下控制点
+		for(int i=0;i<BezierUtil.al.size();i++)
+		{
+			BNPosition bnp=BezierUtil.al.get(i);
+			if(Math.abs(x-bnp.x)<=3&&Math.abs(y-(Constant.HEIGHT-bnp.y))<=3)
+			{
+				currIndex=i;
+				state=1;
+				break;
+			}
+		}
+	}
+
+	@Override
+	public void mouseReleased(MouseEvent arg0)
+	{
+		if(state==1)
+		{
+			state=0;
+			currIndex=-1;
+		}
+		else
+		{
+			BezierUtil.al.add(new BNPosition(arg0.getX(),Constant.HEIGHT-arg0.getY()));
+	    	this.repaint();
+		}
+	}
+
+	@Override
+	public void mouseDragged(MouseEvent arg0) 
+	{ 
+		if(state==1)
+		{
+			BezierUtil.al.get(currIndex).x=arg0.getX();
+			BezierUtil.al.get(currIndex).y=Constant.HEIGHT-arg0.getY();
+			this.repaint();
+		}
+	}
+
+	@Override
+	public void mouseMoved(MouseEvent arg0) 
+	{ 
+		
+	}
+}