myline.java

输入两个点的坐标

import java.awt.geom.*;

public class MyLine {
	public Point end1;
	public Point end2;
	public MyLine() {
		//System.out.println("MyLine(){} Constructor!");
		end1 = new Point();
		end2 = new Point();
	}
	public MyLine(Point p1 , Point p2) {
		end1 = new Point(p1);
		end2 = new Point(p2);
	}
	public boolean Check(){
		if (end1.Check())
		{
			if (end2.Check()) return true;
			else return false;
		}
		else return false;
	}
	public double Length () {
		double xLength;double yLength;
		xLength = end2.GetX()-end1.GetX();
		yLength = end2.GetY()-end1.GetY();
		double value = Math.sqrt(xLength * xLength + yLength * yLength);
		return value;
	}
	public double Distance(Point p) {
		double x;double y;
		x = p.GetX();y = p.GetY();
		return Distance(x,y);
	}
	public double Distance(double x,double y){
		Point C;
		C = new Point(x,y);
		MyLine AC;MyLine BC;
		AC = new MyLine(end1,C);BC = new MyLine(end2,C); 
		double a;double b;double c;
		a = BC.Length();b = AC.Length();c = Length();
		double s;
		s = (a + b + c)/2;
		double area;
		area = Math.sqrt(s*(s-a)*(s-b)*(s-c));
		double distance;
		distance = area*2/Length();
		return distance;
	}
	public boolean IsIntersectant (MyLine line2) {
		if (Line2D.linesIntersect(end1.GetX(), end1.GetY(), end2.GetX(), end2.GetY(), line2.end1.GetX(), line2.end1.GetY(), line2.end2.GetX(), line2.end2.GetY())) return true;
		else return false;
	}
}