Created
August 7, 2013 06:14
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Example of drawing a pie chart slice from Haiku Deck using Core Graphics
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| - (UIBezierPath*)slicePathForDataPoint:(DataPoint*)dataPoint forCompleted:(float)completed forTotal:(float)total { | |
| if(!total) { | |
| return nil; | |
| } | |
| float percentOfTotal = (completed+fabsf([dataPoint.number floatValue]))/total; | |
| float percentCompleted = completed/total; | |
| percentOfTotal *= self.animationScaleFactor; | |
| percentCompleted *= self.animationScaleFactor; | |
| UIBezierPath *slicePath = [UIBezierPath bezierPathWithArcCenter:self.centerPoint | |
| radius:self.radius | |
| startAngle:self.startingAngle+DEGREES_TO_RADIANS(percentCompleted*360) | |
| endAngle:self.startingAngle+DEGREES_TO_RADIANS(percentOfTotal*360) | |
| clockwise:YES]; | |
| UIBezierPath *path = [UIBezierPath bezierPath]; | |
| [path moveToPoint:self.centerPoint]; | |
| [path appendPath:slicePath]; | |
| [path addLineToPoint:self.centerPoint]; | |
| return path; | |
| } | |
| - (void)drawSliceWithDataPoint:(DataPoint*)dataPoint forCompleted:(float)completed forTotal:(float)total { | |
| if(!total) | |
| return; | |
| int colorIdx = [dataPoint.position intValue]%self.colors.count; | |
| UIColor *color; | |
| if(colorIdx<self.colors.count) { | |
| if(self.highlightedIdx > -1 && self.highlightedIdx != colorIdx) { | |
| color = [UIColor grayColor]; | |
| } else { | |
| color = [self.colors objectAtIndex:colorIdx]; | |
| } | |
| } | |
| [color setFill]; | |
| UIBezierPath *path = [self slicePathForDataPoint:dataPoint forCompleted:completed forTotal:total]; | |
| [path fillWithBlendMode: kCGBlendModeNormal alpha:1.0f]; | |
| } |
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