1.計算兩點之間的距離
公式:a2+b2=c2(勾股定理) 2D:3D:
計算機實現:
float Distance2D(Point2D p1,Point2D p2) { float dx=p1.x-p2.x; float dy=p1.y-p2.y; float distance=sqrt(pow(dx,2)+pow(dy,2)); return distance; }
float Distance3D(Point3D p1,Point3D p2) { float dx=p1.x-p2.x; float dy=p1.y-p2.y; float dz=p1.z-p2.z; float distance=sqrt(pow(dx,2)+pow(dy,2)+pow(dz,2)); return distance; }
2.兩點之間的中點
公式:2D:3D:
Point2D MidPoint2D(Point2D p1,Point2D p2) { float sx=p1.x+p2.x; float sy=p1.y+p2.y; Point2D midPoint; midPoint.x=sx/2; midPoint.y=sy/2; return midPoint; }
3D中點計算 Point3D Distance3D(Point3D p1,Point3D p2) { float sx=p1.x+p2.x; float sy=p1.y+p2.y; float sz=p1.z+p2.z; Point3D midPoint; midPoint.x=sx/2; midPoint.y=sy/2; midPoint.z=sz/2; return midPoint; }