tools.java

flowGUI简单的java图形设计

package com.wiziflow.gui;

import javax.swing.*;
import java.awt.*;

/**
 * 工具类。用于辅助计算
 */
public class Tools {

  public static Point[] getClosestPoint(JComponent first,JComponent second){
    if( first == null || second == null ) return null;
    Point ps [] = new Point [4];
    ps[0] = new Point(first.getX()+first.getWidth()/2,first.getY());//北
    ps[1] = new Point(first.getX()+first.getWidth()/2,first.getY()+first.getHeight());//南
    ps[2] = new Point(first.getX()+first.getWidth(),first.getY()+first.getHeight()/2);//东
    ps[3] = new Point(first.getX(),first.getY()+first.getHeight()/2);//西

    //获得给定图标的中心点
    Point po [] = new Point[4];
    po[0] = new Point(second.getX()+second.getWidth()/2,second.getY());//北
    po[1] = new Point(second.getX()+second.getWidth()/2,second.getY()+second.getHeight());//南
    po[2] = new Point(second.getX()+second.getWidth(),second.getY()+second.getHeight()/2);//东
    po[3] = new Point(second.getX(),second.getY()+second.getHeight()/2);//西

    return getClosestPoint(ps,po);

  }
  /**
   * 获得距离最近的两个点。两个控件图标四边中点的比较，返回距离最近的点
   * @param first 画线的第一个控件图标（开始图标）
   * @param second 画线的第二个控件图标（结束图标）
   * @return Point数组，含有两个值,Point[0]-->first;Point[1]-->second
   */
//  public static Point[] getClosestPoint(Bean first,Bean second){
//    return getClosestPoint((JComponent)first,(JComponent)second);
//  }

    /**
     * 获得距离最近的两个点。所有的点比较
     * @param p1 第一组点
     * @param p2 第二组点
     * @return 距离最近的两个点
     */
    public static Point[] getClosestPoint(Point[] p1, Point[] p2){
        if( p1 == null || p2 == null ) return null;
        Point ret[] = new Point[2];
        ret[0] = ret[1] = null;

        int mind = Integer.MAX_VALUE , distance;

        for(int i = 0; i < p1.length; i++){
            for(int j = 0; j < p2.length; j++){
                distance = (int)p1[i].distance(p2[j]);
                if( distance < mind ){
                    ret[0] = p1[i];
                    ret[1] = p2[j];
                    mind = distance;
                }
            }
        }
        return ret;
	}

    /**
     * 开始画线时，鼠标的坐标和图标控件坐标(四个边中点)比较
     * @param b 图标控件
     * @param p 鼠标坐标
     * @return 最短的距离
     */
//    public static Point[] getClosestPoint(Bean b, Point p){
//      return getClosestPoint(b,p);
//    }
//
    public static Point[] getClosestPoint(JComponent b, Point p){
      if(b==null) return null;
      Point po [] = new Point[1];
      po[0]=p;

      Point ps [] = new Point [4];
      ps[0] = new Point(b.getX()+b.getWidth()/2,b.getY());//北
      ps[1] = new Point(b.getX()+b.getWidth()/2,b.getY()+b.getHeight());//南
      ps[2] = new Point(b.getX()+b.getWidth(),b.getY()+b.getHeight()/2);//东
      ps[3] = new Point(b.getX(),b.getY()+b.getHeight()/2);//西

      return getClosestPoint(ps,po);
    }

}