JAVA 获取两条直线的交点
代码如下：
public class PointIntersect {
public static class Point{
private double x
;
private double y
;
public Point(double x
,double y
){
this.x
=x
;
this.y
=y
;
}
public double
getX() {
return x
;
}
public void setX(double x
) {
this.x
= x
;
}
public double
getY() {
return y
;
}
public void setY(double y
) {
this.y
= y
;
}
@Override
public String
toString() {
return ReflectionToStringBuilder
.toString(this, ToStringStyle
.SHORT_PREFIX_STYLE);
}
}
public static Point
getIntersectPoint(Point p1
, Point p2
, Point p3
, Point p4
){
double
A1=p1
.getY()-p2
.getY();
double
B1=p2
.getX()-p1
.getX();
double
C1=A1*p1
.getX()+B1*p1
.getY();
double
A2=p3
.getY()-p4
.getY();
double
B2=p4
.getX()-p3
.getX();
double
C2=A2*p3
.getX()+B2*p3
.getY();
double det_k
=A1*B2-A2*B1;
if(Math
.abs(det_k
)<0.00001){
return null;
}
double a
=B2/det_k
;
double b
=-1*B1/det_k
;
double c
=-1*A2/det_k
;
double d
=A1/det_k
;
double x
=a
*C1+b
*C2;
double y
=c
*C1+d
*C2;
return new Point(x
,y
);
}
public static void main(String
[] args
) {
Point p1
=new Point(1,1);
Point p2
=new Point(5,5);
Point p3
=new Point(2,1);
Point p4
=new Point(2,5);
Point point
=getIntersectPoint(p1
,p2
,p3
,p4
);
if(point
==null){
System
.out
.print("未相交");
}else{
System
.out
.print("相交于："+point
.toString());
}
}
}
测试结果：
相交于：PointIntersect
.Point
[x
=2.0,y
=2.0]
