ConstrainedPoint.c

NSPoint ConstrainPointInsideRect(CGPoint freePoint, NSRect boundaryRect)
{
    //NSPoint constrainedViewPoint = DFConstrainPointToRect(viewPoint, boundaryRect);
    // Make sure the handle cannot be dragged outside of the plot range
    
    if (NSPointInRect(freePoint, boundaryRect)) {
        return freePoint;
    }
    
    NSPoint cp = freePoint;
    NSRect br = boundaryRect;
    if (freePoint.x <= NSMinX(br) && freePoint.y <= NSMinY(br) ) {
        cp.x = br.origin.x; cp.y = br.origin.y; }
    else if (freePoint.x <= NSMinX(br) && freePoint.y >= NSMaxY(br)) {
        cp.x = NSMinX(br); cp.y = NSMaxY(br); }
    else if (freePoint.x >= NSMaxX(br) && freePoint.y <= NSMinY(br)) {
        cp.x = NSMaxX(br); cp.y = NSMinY(br); }
    else if (freePoint.x >= NSMaxX(br) && freePoint.y >= NSMaxY(br)) {
        cp.x = NSMaxX(br); cp.y = NSMaxY(br); }
    else if (freePoint.x <= NSMinX(br))
        cp.x = NSMinX(br);
    else if (freePoint.x > NSMaxX(br))
        cp.x = NSMaxX(br);
    else if (freePoint.y <= NSMinY(br))
        cp.y = NSMinY(br);
    else  // y > NSMaxY
        cp.y = NSMaxY(br);
    return cp;
}