Prevents the point argument from going outside the bounds of the rect. This might be useful in cases where the user is dragging an object and the object need to be contained within a given rect.

ConstrainedPoint.c

NSPoint ConstrainPointInsideRect(CGPoint fp, NSRect frame)
{
    NSPoint fp = fp;
    NSPoint pt = NSZeroPoint;
    NSRect f = frame;
    if (fp.x <= NSMinX(br) && fp.y <= NSMinY(br) ) {
        pt.x = br.origin.x; pt.y = br.origin.y; }
    else if (fp.x <= NSMinX(br) && fp.y >= NSMaxY(br)) {
        pt.x = NSMinX(br); pt.y = NSMaxY(br); }
    else if (fp.x >= NSMaxX(br) && fp.y <= NSMinY(br)) {
        pt.x = NSMaxX(br); pt.y = NSMinY(br); }
    else if (fp.x >= NSMaxX(br) && fp.y >= NSMaxY(br)) {
        pt.x = NSMaxX(br); pt.y = NSMaxY(br); }
    else if (fp.x <= NSMinX(br))
        pt.x = NSMinX(br);
    else if (fp.x > NSMaxX(br))
        pt.x = NSMaxX(br);
    else if (fp.y <= NSMinY(br))
        pt.y = NSMinY(br);
    else  // y > NSMaxY
        pt.y = NSMaxY(br);
    return pt;
}