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#import "MGLCompassCell.h"
@implementation MGLCompassCell
- (instancetype)init {
if (self = [super init]) {
self.sliderType = NSCircularSlider;
// A tick mark for each cardinal direction.
self.numberOfTickMarks = 4;
// This slider goes backwards!
self.minValue = -360;
self.maxValue = 0;
}
return self;
}
- (void)drawKnob:(NSRect)knobRect {
// Draw a red triangle pointing whichever way the slider is facing.
NSBezierPath *trianglePath = [NSBezierPath bezierPath];
[trianglePath moveToPoint:NSMakePoint(NSMinX(knobRect), NSMaxY(knobRect))];
[trianglePath lineToPoint:NSMakePoint(NSMaxX(knobRect), NSMaxY(knobRect))];
[trianglePath lineToPoint:NSMakePoint(NSMidX(knobRect), NSMinY(knobRect))];
[trianglePath closePath];
NSAffineTransform *transform = [NSAffineTransform transform];
[transform translateXBy:NSMidX(knobRect) yBy:NSMidY(knobRect)];
[transform scaleBy:0.8];
[transform rotateByDegrees:self.doubleValue];
[transform translateXBy:-NSMidX(knobRect) yBy:-NSMidY(knobRect)];
[trianglePath transformUsingAffineTransform:transform];
[[NSColor redColor] setFill];
[trianglePath fill];
}
@end
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