myline.java~63~

Java画版程序。......................要求变态。

package myshape;

/**
 * Title:
 * Description:
 * Copyright:    Copyright (c) 2002
 * Company:
 * @author
 * @version 1.0
 */

import java.awt.*;
import myframe.*;

public class MyLine extends  MyShapeAdapter{
 private MyPoint startPoint,endPoint;
 //private int radius;
 public MyLine(){
 }
 public MyLine(MyPoint start,MyPoint end){
 startPoint=start;
 endPoint=end;
 }
 private Color color=super.defaultColor;
 private Color defaultColor=super.defaultColor;
 public  void setColor(Color c){
   color=c;
 }
 public Color getColor(){
   return color;
 }
 public void setDefaultColor(Color c){
   defaultColor=c;
 }
 public Color getDefaultColor(){
   return defaultColor;
 }
 public void paint(Graphics g){
  int x1,y1,x2,y2;
  double[] x=new double[4];
  double y[]=new double[4];
  int width=DrawCavans.width;
  int height=DrawCavans.height;

 //startPoint.paint(g);
 //endPoint.paint(g);
    x1=endPoint.getX();
    y1=endPoint.getY();
    if(endPoint.getX()==startPoint.getX()){
     y[0]=0;x[1]=x[0]=endPoint.getX();y[1]=height;x[2]=x[3]=-1;
    }
    else if(endPoint.getY()==startPoint.getY()){
     x[0]=0;y[1]=y[0]=endPoint.getY();x[1]=width;x[2]=x[3]=-1;
    }
    else{
       double tan=(y1-startPoint.getY())*1.0/(x1-startPoint.getX());
       x[0]=x1-y1/tan;
       y[0]=0;
       x[1]=width;
       y[1]=y1+tan*(x[1]-x1);
       y[2]=height;
       x[2]=x1+(y[2]-y1)*1.0/tan;
       x[3]=0;
       y[3]=y1-tan*x1;
   }
   int a[]=new int[4];
   int j=0;
  for(int i=0;i<4;i++){
  // System.out.println("x=   "+x[i]+"  y= "+y[i]);
    if(x[i]>=0 && x[i]<width+1 && y[i]>=0 && y[i]<height+1){
      a[j++]=i;
    }
  }

   g.setColor(color);
   g.drawLine((int)x[a[0]],(int)y[a[0]],(int)x[a[1]],(int)y[a[1]]);
 }

  public MyShape getShape(){//深度的克隆
   MyLine line1=(MyLine)this.clone();
   line1.startPoint=(MyPoint)startPoint.clone();
   line1.endPoint=(MyPoint)endPoint.clone();
   //MyLine l=(MyLine)this.clone();
   //l.startPoint.moveObject(startPoint.getX()+4,centerPoint.getY()+4);
   //l.endPoint.moveObject(endPoint.getX()+4,endPoint.getY()+4);
   return line1;
 }

 public void moveObject(int x,int y){
   if(movedPoint!=null){
      if(!moveLine){
       //movedPoint.moveObject(x,y);
      }
      else{
        int tempx=x-movedPoint.getX();
        int tempy=y-movedPoint.getY();

        movedPoint=new MyPoint(x,y);
        startPoint.moveObject(tempx+startPoint.getX(),tempy+startPoint.getY());
        endPoint.moveObject(tempx+endPoint.getX(),tempy+endPoint.getY());
      }
   }

 }
 public void moveObject(MyShape s,int x,int y){
   MyPoint p1=(MyPoint)s;
   int tempx=startPoint.getX()-endPoint.getX();
   int tempy=startPoint.getY()-endPoint.getY();
   if(tempx==0){
    p1.moveObject(startPoint.getX(),y);
   }
   else if(tempy==0){
    p1.moveObject(x,startPoint.getY());
   }
   else{
    double k1=tempy*1.0/tempx;
    double k2=-1/k1;
    double temp1=startPoint.getY()-k1*startPoint.getX();
    double temp2=y-k2*x;
    p1.moveObject((int)((temp1-temp2)/(k2-k1)),(int)((k2*temp1-k1*temp2)/(k2-k1)));
   }
 }

 private MyPoint movedPoint;
 private boolean moveLine=true;
 public boolean getChanged(){return !moveLine;}

 public boolean nearTo(int x,int y){
 //centerPoint.attachToOthers=false;
  movedPoint=null;
  if(startPoint.nearTo(x,y)){
   //  centerPoint.attachToOthers=true;
    // movedPoint=startPoint;
     moveLine=false;
     return false;
  }
  if(endPoint.nearTo(x,y)){
     //movedPoint=endPoint;
     moveLine=false;
     return false;
  }
  //centerPoint.attachToOthers=true;
  int tempx=(startPoint.getX()-x)*(endPoint.getY()-y);
  int tempy=(startPoint.getY()-y)*(endPoint.getX()-x);
  tempx=(int)Math.sqrt(Math.abs(tempx-tempy));
 // System.out.print("OK  "+tempx);
  if(tempx<20){
     movedPoint=new MyPoint(x,y);
     moveLine=true;
     return true;
  }
  return false;
 }
 public String toString(){
   String s="直线 ";
   return s;
  }
 public MyPoint getPoint(){
   return movedPoint;
 }
}