CircleView.m
/* |
File: CircleView.m |
Abstract: The CircleView class of the TextLayoutDemo project. |
Version: 1.1 |
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*/ |
#import "CircleView.h" |
@implementation CircleView |
@synthesize layoutManager; |
- (void)drawRect:(NSRect)rect { |
NSUInteger glyphIndex; |
NSRange glyphRange = NSMakeRange(0, 0); |
NSRect bounds = [self bounds], lineRect = [layoutManager lineFragmentRectForGlyphAtIndex:0 effectiveRange:&glyphRange]; |
NSGraphicsContext *context = [NSGraphicsContext currentContext]; |
[[NSColor whiteColor] set]; |
NSRectFill(bounds); |
for (glyphIndex = glyphRange.location; glyphIndex < NSMaxRange(glyphRange); glyphIndex++) { |
NSPoint location = [layoutManager locationForGlyphAtIndex:glyphIndex]; |
NSAffineTransform *transform = [NSAffineTransform transform]; |
CGFloat radius = fmin(bounds.size.width, bounds.size.height) / 2.0, distance = radius - location.y, angle = startingAngle + location.x / distance; |
[transform translateXBy:radius + distance * sin(angle) yBy:bounds.size.height - radius + distance * cos(angle)]; |
[transform rotateByRadians:-angle]; |
[context saveGraphicsState]; |
[transform concat]; |
[layoutManager drawGlyphsForGlyphRange:NSMakeRange(glyphIndex, 1) atPoint:NSMakePoint(-(lineRect.origin.x + location.x), -(lineRect.origin.y + location.y))]; |
[context restoreGraphicsState]; |
} |
} |
- (BOOL)isOpaque { |
return YES; |
} |
- (void)incrementStartingAngle:(NSTimer *)timer { |
startingAngle += 0.05; |
[self setNeedsDisplay:YES]; |
} |
@end |
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