+ (CGPoint)getCrossPointWithPoint:(CGPoint)p1 p2:(CGPoint)p2 p3:(CGPoint)p3 p4:(CGPoint)p4 {
float K1,K2,N1,N2;
float x,y;
K1 = [self getLineK:p1Point2:p2ConstN:&N1];
K2 = [self getLineK:p3Point2:p4ConstN:&N2];
if(K1 == K2){//两条直线平行
return CGPointZero;
}
x = (N2 - N1 )/(K1 - K2);
y = K1 * x + N1;
NSLog(@"x:%f ,y:%f",x,y);
return CGPointMake(x, y);
}
+ (float)getLineK:(CGPoint)point1 Point2:(CGPoint)point2 ConstN:(float*)N{
float K = (point1.y- point2.y)/(point1.x- point2.x);
*N = point1.y- K * point1.x;
return K;
}
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