This control draws a pie chart with multiple slices at even angles, each slice can have different radius. Useful when displaying coverage data.

Sample code

Create and add a new chart:

CSCoverageChart coverage = [[CSCoverageChart alloc] initWithFrame:CGRectMake(0,0, 600, 600)];

coverage.center = self.view.center;
coverage.delegate = self;

[self.view addSubview:coverage];

Declare delegate implementation:

@interface ViewController : UIViewController<CSCoverageChartDelegate>

Implement delegate methods:

- (int)numberOfSlicesForChart:(CSCoverageChart*)chart;
- (CSCoverageSlice*)coverageChart:(CSCoverageChart*)chart sliceForIndex:(int)index;
- (CSCoverageArea*)coverageAreaForChart:(CSCoverageChart*)chart;
- (float)maximumRadiusForChart:(CSCoverageChart*)chart;

Slice and chart area objects

Each slice is an CSCoverageSlice object:

CSCoverageSlice* slice = [[CSCoverageSlice alloc] init];
slice.fillColor = [[UIColor blueColor] colorWithAlphaComponent:0.3];
slice.strokeColor = [UIColor darkGrayColor];
slice.value = 0.35;

The value property is a float value ranging from 0 to 1, defining the actual radius of the slice as a fraction of the maximum radius.

Chart area settings are defined using a CSCoverageArea object.

CSCoverageArea* area = [[CSCoverageArea alloc] init];
area.scaleLinesCount = 4;
area.lineColor = [UIColor grayColor];
area.lineWidth = 1;
area.selectedLineWidth = 4;

Acknowledgements

© 2013, CommonSense srl. Released under the MIT License.