/*

     File: ASCView.m 

 Abstract: A subclass of SCNView that handles mouse events to rotate a specific node only. 

  Version: 1.0 

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 */

#import "ASCView.h"

@implementation ASCView {

    NSPoint       _clickLocation;

    CATransform3D _initialTransform;

}

#define ROTATION_FACTOR 0.003

- (void)mouseDown:(NSEvent *)theEvent {

    _clickLocation = [theEvent locationInWindow];

    _clickLocation = [self convertPointFromBase:_clickLocation];

    _initialTransform = [_selectionDelegate selectedObjectForView:self].transform;

}

- (void)mouseDragged:(NSEvent *)theEvent {

    NSPoint point = [theEvent locationInWindow];

    point = [self convertPointFromBase:point];

    // Compute deltas

    CGFloat dx =  point.x - _clickLocation.x;

    CGFloat dy =  point.y - _clickLocation.y;

    // Convert to transforms, combine

    CATransform3D rotY = CATransform3DMakeRotation(dx * ROTATION_FACTOR, 0, 1, 0);

    CATransform3D rotX = CATransform3DMakeRotation(dy * ROTATION_FACTOR, -1, 0, 0);

    CATransform3D rotation = CATransform3DConcat(rotY, rotX);

    // Apply

    [_selectionDelegate selectedObjectForView:self].transform = CATransform3DConcat(_initialTransform, rotation);

}

@end