iOS & macOS Charting Documentation - SciChart iOS & macOS Charts SDK v4.x

ISCIPieDonutDrawingManagerBase

@protocol ISCIPieDonutDrawingManagerBase

Defines the interface with helper methods for rendering of pie and donut renderable series.


                        
                        
                        -onBeginDrawingOnCGContext:currentPieRenderPassData:

Begins drawing with this drawing manager instance

Declaration

Objective-C

- (void)onBeginDrawingOnCGContext:(nonnull CGContextRef)context
         currentPieRenderPassData:
             (nonnull id<ISCIPieDonutRenderPassData>)currentPieRenderPassData;

Swift

func onBeginDrawing(on context: CGContext, currentPieRenderPassData: any ISCIPieDonutRenderPassData)

Parameters

`context`	The `CGContext` to draw on.
`currentPieRenderPassData`	The current render pass data.


                        
                        
                        -drawLabelsWithSegments:center:outerRadius:selectedSegmentOffset:

Draws specified pie segments.

Declaration

Objective-C

- (void)drawLabelsWithSegments:
            (nonnull NSArray<SCIPieSegmentRenderPassData *> *)segments
                        center:(CGPoint)center
                   outerRadius:(float)outerRadius
         selectedSegmentOffset:(float)selectedSegmentOffset;

Swift

func drawLabels(withSegments segments: [SCIPieSegmentRenderPassData], center: CGPoint, outerRadius: Float, selectedSegmentOffset: Float)

Parameters

`segments`	The pie segments to draw.
`center`	The coordinate of center of chart.
`outerRadius`	The outer radius to use during drawing which tells how far from center to draw labels.
`selectedSegmentOffset`	The offset to apply for selected segments.

-onEndDrawing
Ends drawing with this drawing manager instance.
Declaration
Objective-C

- (void)onEndDrawing;
Swift

func onEndDrawing()