可分别在面板中绘制Hermite曲线，Bezier曲线和B样条曲线Java.zip

package de_Casteljau; import javax.swing.*; import java.awt.*; import java.awt.event.*; import java.awt.geom.*; import java.util.*; public class BezierFrame extends JFrame{ /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub BezierFrame bf=new BezierFrame(); bf.setSize(500, 500); bf.setResizable(false); bf.setVisible(true); } BezierPanel bp=null; BtnPanel btnp=null; public BezierFrame() { this.setLayout(new BorderLayout()); bp=new BezierPanel(); add(bp,BorderLayout.CENTER); btnp=new BtnPanel(); add(btnp,BorderLayout.SOUTH); } } class BtnPanel extends JPanel { public JButton btn_bezier=null; public JButton btn_bspline=null; //public JButton btn_erase=null; public JLabel status=null; //public BezierPanel bp=null; JButton btn_hermite=new JButton("Hermite"); public BtnPanel() { btn_bezier=new JButton("Bezier"); btn_bspline=new JButton("B-Spline"); status=new JLabel("Bezier"); //btn_erase=new JButton("Erase"); //bp=new BezierPanel(); this.setLayout(new FlowLayout()); add(btn_bezier); add(btn_bspline); add(btn_hermite); add(status); /*btn_erase.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent event) { //bp.eraseCurve(); } });*/ btn_bezier.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent event) { //System.out.println("1"); BezierPanel.select=1; status.setText("Bezier"); } }); btn_bspline.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent event) { //System.out.println("2"); BezierPanel.select=2; status.setText("Bspline"); } }); btn_hermite.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent event) { BezierPanel.select=3; status.setText("Hermite"); } }); } } class BezierPanel extends JPanel { int[] x; int[] y; int i,j; int flag=0; int k; boolean erase=false; public static int select=1; int flagb=0; int ib,jb; int translate=0; int pressPoint=-1; Vector vx=new Vector(); Vector vy=new Vector(); int n,size,h,z; int kb=3; int[] t; int[] xh; int[] yh; int jh=0; int kh=0; public BezierPanel() { x=new int[4]; y=new int[4]; xh=new int[4]; yh=new int[4]; this.setBackground(Color.WHITE); this.setForeground(Color.BLACK); this.addMouseListener(new MouseAdapter() { public void mouseClicked(MouseEvent e) { Graphics g=getGraphics(); if((e.getModifiersEx()&InputEvent.BUTTON3_DOWN_MASK)!=0) { System.out.println("r"); //g.clearRect(0, 0, 500, 500); //j=0; //for(i=0;i<4;i++) //{ //x[i]=0; //y[i]=0; //} } else { if(BezierPanel.select==1) { if(j<4&(erase==false)) { x[j]=e.getX(); y[j]=e.getY(); g.drawString(x[j]+","+y[j], x[j], y[j]); if(j>=1) { g.drawLine(x[j-1], y[j-1], x[j], y[j]); } j++; } if(j==4&(erase==false)) { drawBezier(g,x,y); /*j=0; for(i=0;i<4;i++) { x[i]=0; y[i]=0; }*/ /////// } } else { if(BezierPanel.select==3) { if(jh<4&(erase==false)) { xh[jh]=e.getX(); yh[jh]=e.getY(); if (jh%2==0) { g.drawString(xh[jh]+","+yh[jh], xh[jh], yh[jh]); } else if (jh%2==1) { g.drawLine(xh[jh-1], yh[jh-1], xh[jh], yh[jh]); } } jh++; if(jh==4&(erase==false)) { DrawHermite(xh[0],yh[0],xh[2],yh[2],(xh[1]-xh[0]),(yh[1]-yh[0]),(xh[3]-xh[2]),(yh[3]-yh[2]),g); jh=0; } } } } } }); this.addMouseListener(new MouseAdapter() { public void mousePressed(MouseEvent e) { if((e.getModifiersEx()&InputEvent.BUTTON3_DOWN_MASK)!=0) { //System.out.println("r"); erase=true; Graphics g=getGraphics(); g.clearRect(0, 0, 500, 500); j=0; k=0; flag=0; for(i=0;i<4;i++) { x[i]=0; y[i]=0; } vx.removeAllElements(); vy.removeAllElements(); flagb=0; pressPoint=-1; } else { erase=false; if(BezierPanel.select==1) { panel_mousePressed(e); } if(BezierPanel.select==2) { panel_mousePressedB(e); } if(BezierPanel.select==3) { panel_mousePressedH(e); } } } }); this.addMouseMotionListener(new MouseMotionAdapter() { public void mouseDragged(MouseEvent e) { if((e.getModifiersEx()&InputEvent.BUTTON3_DOWN_MASK)!=0) { } else { if(BezierPanel.select==1) { panel_mouseDragged(e); } if(BezierPanel.select==2) { panel_mouseDraggedB(e); } if(BezierPanel.select==3) { panel_mouseDraggedH(e); } } } }); } public void panel_mousePressed(MouseEvent e) { Graphics g=getGraphics(); int[] ax=new int[4]; int[] ay=new int[4]; int x0=e.getX(); int y0=e.getY(); Polygon a; for(i=0;i<4;i++) { ax[0]=x[i]-10; ax[1]=x[i]+10; ax[2]=x[i]+10; ax[3]=x[i]-10; ay[0]=y[i]-10; ay[1]=y[i]-10; ay[2]=y[i]+10; ay[3]=y[i]+10; a=new Polygon(ax,ay,4); if(a.contains(x0, y0)) { k=i; flag=1; } } } public void panel_mousePressedB(MouseEvent e) { Graphics g=getGraphics(); flagb=0; int[] ax=new int[4]; int[] ay=new int[4]; int x0=e.getX(); int y0=e.getY(); Polygon a; for(ib=0;ib<vx.size();ib++) { ax[0]=((Integer)vx.get(ib)).intValue()-10; ax[1]=((Integer)vx.get(ib)).intValue()+10; ax[2]=((Integer)vx.get(ib)).intValue()+10; ax[3]=((Integer)vx.get(ib)).intValue()-10; ay[0]=((Integer)vy.get(ib)).intValue()-10; ay[1]=((Integer)vy.get(ib)).intValue()-10; ay[2]=((Integer)vy.get(ib)).intValue()+10; ay[3]=((Integer)vy.get(ib)).intValue()+10; a=new Polygon(ax,ay,4); if(a.contains(x0,y0)) { flagb=1; pressPoint=ib; } } if(flagb==0) { Integer IntX0=new Integer(x0); Integer IntY0=new Integer(y0); vx.addElement(IntX0); vy.addElement(IntY0); size=vx.size(); g.setColor(Color.BLUE); g.fillOval(IntX0.intValue()-3, IntY0.intValue()-3, 6, 6); if(size>1) { g.drawLine( ((Integer)vx.get(size-2)).intValue(), ((Integer)vy.get(size-2)).intValue(), ((Integer)vx.get(size-1)).intValue(), ((Integer)vy.get(size-1)).intValue() ); } } size=vx.size(); if(size>3) { repaint(); } } public void panel_mousePressedH(MouseEvent e) { Graphics g=getGraphics(); int[] ax=new int[4]; int[] ay=new int[4]; int x0=e.getX(); int y0=e.getY(); Polygon a; for(i=0;i<4;i++) { ax[0]=xh[i]-10; ax[1]=xh[i]+10; ax[2]=xh[i]+10; ax[3]=xh[i]-10; ay[0]=yh[i]-10; ay[1]=yh[i]-10; ay[2]=yh[i]+10; ay[3]=yh[i]+10; a=new Polygon(ax,ay,4); if(a.contains(x0, y0)) { kh=i; } } } public void panel_mouseDragged(MouseEvent e) { Graphics g=getGraphics(); if(flag==1) { int x1=e.getX(); int y1=e.getY(); x[k]=x1; y[k]=y1; repaint(); g.clearRect(0, 0, 500, 500); g.drawLine(x[0], y[0], x[1], y[1]); g.drawLine(x[1], y[1], x[2], y[2]); g.drawLine(x[2], y[2], x[3], y[3]); g.drawString(x[0]+","+y[0], x[0], y[0]); g.drawString(x[1]+","+y[1], x[1], y[1]); g.drawString(x[2]+","+y[2], x[2], y[2]); g.drawString(x[3]+",