intersect.java

这是自定义工作流的图形定义部分

//package vlab;   判断此点是否在规定地范围内
import java.awt.*;
/**
 * Title:        work-flow
 * Description:
 * Copyright:    Copyright (c) 2002
 * Company:      CSU
 * @author       smallbeetle
 * @version 1.0
 */

public class Intersect {
  //dot and line
  public static boolean isIntersect(Point dot, Point header, Point tail ){
    return isIntersect(new Rectangle(dot.x, dot.y, 1, 1), getRect(header, tail));
  }

  public static Rectangle getRect(Point p1, Point p2){
    int x = p1.x <= p2.x ? p1.x : p2.x;
    int y = p1.y <= p2.y ? p1.y : p2.y;
    int w = Math.abs(p1.x - p2.x);
    int h = Math.abs(p1.y - p2.y);
    return new Rectangle(x, y, w, h);
  }


  //dot and rectangle
  public static boolean isIntersect(Point dot, Rectangle rect){
    return rect.contains(dot) ;
  //    return ((dot.x >= rect.x ) && (dot.x <= rect.x +rect.width) &&(dot.y >= rect.y ) && (dot.y <= rect.y +rect.height));
  }

 //line and line
 public static boolean isIntersect(Point h1, Point t1, Point h2, Point t2){
   return isIntersect(getRect(h1,t1), getRect(h2, t2));
 }

 //line and rectangle
  public static boolean isIntersect(Point h, Point t, Rectangle r){
    return isIntersect(getRect(h, t), r);
  }

  //rectangle and rectangle
  public static boolean isIntersect(Rectangle r1, Rectangle r2){
    if ( r2.y > r1.y+r1.height || r2.y + r2.height < r1.y
         || r2.x + r2.width < r1.x || r2.x  > r1.x + r1.width){
      return false;
    }
    return true;
  }
}