OOPointMaths.h

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#import "OOFunctionAttributes.h"
#include <tgmath.h>
 
 
// Utilities for working with NSPoints as 2D vectors.
OOINLINE NSPoint PtAdd(NSPoint a, NSPoint b)
{
    return NSMakePoint(a.x + b.x, a.y + b.y);
}
 
OOINLINE NSPoint PtSub(NSPoint a, NSPoint b)
{
    return NSMakePoint(a.x - b.x, a.y - b.y);
}
 
OOINLINE NSPoint PtScale(NSPoint p, CGFloat scale)
{
    return NSMakePoint(p.x * scale, p.y * scale);
}
 
OOINLINE CGFloat PtDot(NSPoint a, NSPoint b)
{
    return a.x * b.x + a.y * b.y;
}
 
OOINLINE CGFloat PtCross(NSPoint a, NSPoint b)
{
    return a.x * b.y - b.x * a.y;
}
 
OOINLINE NSPoint PtRotCW(NSPoint p)
{
    // Rotate 90 degrees clockwise.
    return NSMakePoint(p.y, -p.x);
}
 
OOINLINE NSPoint PtRotACW(NSPoint p)
{
    // Rotate 90 degrees anticlockwise.
    return NSMakePoint(-p.y, p.x);
}
 
OOINLINE NSPoint PtNormal(NSPoint p)
{
    return PtScale(p, 1.0 / sqrt(PtDot(p, p)));
}