在java中實現圖形學中的直線算法

有同學向我要在java中實現圖形學中的橢圓算法，畫直線的算法的程序，在此就獻醜了，把上大學時用java寫的源代碼給先學者做個參考，下面是實現直線的算法

//author computer np
/*test date
*(0,0)(300,15)/(-300,-300)(300,300)/(0,0)
*(300,300)/(-200,-50)(300,150)*0<K<=1
*
*(0,0)(300,450)/(0,0)(300,800)(50,500)(-50,-500)*K>1
*
*(-50,500)(50,-500)/(-50,500)(100,-500)*K<-1
*
*(-200,50)(200,-100)
*
*/
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;

public class DrawLine
{
public static void main(String[] args)
{
  new MainFrame();
}
}
class MainFrame extends JFrame implements ActionListener
{
JPanel pane=new JPanel();
//JLabel zuobiao;
JTextField T_x0,T_y0,T_x1,T_y1;
JButton Draw,Show;
JLabel L_x0,L_y0,L_x1,L_y1;
int x0,y0,x1,y1;
MainFrame()
{
  super("DrawLine Window");
  Container con=this.getContentPane();
  con.setLayout(null);

  pane.setBounds(20,20,850,550);
  pane.setBackground(new Color(100,156,200));
  con.add(pane);

  L_x0=new JLabel("X0");
  L_x0.setBounds(230,580,30,20);
  con.add(L_x0);

  L_x1=new JLabel("X1");
  L_x1.setBounds(370,580,30,20);
  con.add(L_x1);

  L_y0=new JLabel("Y0");
  L_y0.setBounds(230,630,30,20);
  con.add(L_y0);

  L_y1=new JLabel("Y1");
  L_y1.setBounds(370,630,30,20);
  con.add(L_y1);

  T_x0=new JTextField();
  T_x0.setBounds(270,580,50,20);
  con.add(T_x0);

  T_y0=new JTextField();
  T_y0.setBounds(270,630,50,20);
  con.add(T_y0);

  T_x1=new JTextField();
  T_x1.setBounds(400,580,50,20);
  con.add(T_x1);

  T_y1=new JTextField();
  T_y1.setBounds(400,630,50,20);
  con.add(T_y1);

  Draw=new JButton("畫線");
  Draw.setBounds(550,580,90,30);
  Draw.addActionListener(this);
  con.add(Draw);

  Show=new JButton("顯示座標");
  Show.setBounds(550,620,90,30);
  Show.addActionListener(this);
  con.add(Show);

  this.addWindowListener(new CloseWindow());
  this.setBounds(20,20,900,700);
  this.setVisible(true);
  this.setResizable(false);

}

public void actionPerformed(ActionEvent e)
{
     if(e.getSource()==Draw)
     {
     x0=Integer.parseInt(T_x0.getText().trim());
      y0=Integer.parseInt(T_y0.getText().trim());
      x1=Integer.parseInt(T_x1.getText().trim());
      y1=Integer.parseInt(T_y1.getText().trim());

       float K=(float)(y1-y0)/(x1-x0);

       Line line=new Line(this);
       if(K>=0&&K<=1)
         line.draw0(x0,y0,x1,y1);
       else if(K>1)
         line.draw1(x0,y0,x1,y1);
       else if(K<=0&&K>=-1)
         line.draw2(x0,y0,x1,y1);
      else if(K<-1)
        line.draw3(x0,y0,x1,y1);
     }
     if(e.getSource()==Show)
     {
     Graphics g1=this.pane.getGraphics();
          g1.setColor(Color.PINK);
          g1.drawLine(0,300,920,300);//----x---
          g1.drawLine(410,0,410,720);//----y---
          g1.dispose();
     }

}/*method actionPerformed*/
}
class Line
{
MainFrame jb;
Line(MainFrame jb)
{
  this.jb=jb;
}
//*************0<K<1*********************************
public void draw0(int x0,int y0,int x1,int y1)//0<K<1
{
  int dx,dy,d,UpIncre,DownIncre,x,y;
     if(x0>x1)
      {
      x=x1;x1=x0;x0=x;
      y=y1;y1=y0;y0=y;
     }
      x=x0; y=y0;
    dx=x1-x0; dy=y1-y0;
    d=dx-2*dy;
    UpIncre=2*dx-2*dy;
     DownIncre=-2*dy;
     while(x<=x1)
        {
      try
      {
      Graphics g=jb.pane.getGraphics();
      g.setColor(Color.red);
          g.drawLine(x+410,y+300,x+412,y+302);
          g.dispose();
          Thread.sleep(30);
      }catch(Exception e){}
         x++;
         if(d<0)
      {
       y++;
       d+=UpIncre;
      }
      else
   d+=DownIncre;
     }

}
//*************0<K<1*********************************
//----------K>1------------------------------------
public void draw1(int x0,int y0,int x1,int y1)//K>1
{
  int dx,dy,d,UpIncre,DownIncre,x,y;
     if(x0>x1)
     {
     x=x1;x1=x0;x0=x;
     y=y1;y1=y0;y0=y;
    }
    x=x0; y=y0;
    dx=x1-x0;
    dy=y1-y0;
        d=2*dx-dy;
    UpIncre=2*dx;
    DownIncre=2*dx-2*dy;
    while(x<=x1)
     {
      try
      {
      Graphics g=jb.pane.getGraphics();
      g.setColor(Color.red);
          g.drawLine(x+410,y+300,x+412,y+302);
          g.dispose();
          Thread.sleep(30);
      }catch(Exception e){}
      y++;
      if(d>=0)
      {
      x++;
      d+=DownIncre;
      }
      else
      d+=UpIncre;
     }
}
//----------K>1------------------------------------
//***********-1<k<0*************************************
public void draw2(int x0,int y0,int x1,int y1)// -1<K<0
{
  int dx,dy,d,UpIncre,DownIncre,x,y;
     if(x0>x1)
     {
      x=x1;x1=x0;x0=x;
      y=y1;y1=y0;y0=y;
     }
     x=x0; y=y0;
    dx=x1-x0;
    dy=y1-y0;
    d=-dx-2*dy;
    UpIncre=-2*dy;
    DownIncre=-2*dx-2*dy;
    while(x<=x1)
    {
      try
      {
      Graphics g=jb.pane.getGraphics();
      g.setColor(Color.red);
          g.drawLine(x+410,y+300,x+412,y+302);
          g.dispose();
          Thread.sleep(30);
      }catch(Exception e){}
     x++;
     if(d>=0)
     {
      y--;
      d+=DownIncre;

     }
     else
      d+=UpIncre;
    }
}
//***********-1<k<0*************************************
//------------K>-1--------------------------------------
public void draw3(int x0,int y0,int x1,int y1)// K<-1
{
  int dx,dy,d,UpIncre,DownIncre,x,y;
    if(x0>x1)
    {
     x=x1;x1=x0;x0=x;
     y=y1;y1=y0;y0=y;
    }
    x=x0; y=y0;
    dx=x1-x0;
    dy=y1-y0;
    d=-2*dx-dy;
    UpIncre=-2*dx;
    DownIncre=-2*dx-2*dy;
    while(x<=x1)
    {
     try
      {
      Graphics g=jb.pane.getGraphics();
      g.setColor(Color.red);
          g.drawLine(x+410,y+300,x+412,y+302);
          g.dispose();
          Thread.sleep(30);
      }catch(Exception e){}
     y--;
     if(d<0)
     {
      x++;
      d+=DownIncre;
     }
     else
   d+=UpIncre;
    }
}
//------------K>-1----------------------------------
}
class CloseWindow extends WindowAdapter
{
public void windowClosing(WindowEvent e)
{
  System.exit(0);
}
}

在java中實現圖形學中的直線算法

在java中實現圖形學中的直線算法

在java中實現圖形學中的橢圓算法

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