Interface definition for a callback to be invoked when a pie or donut series label is about to be drawn.
Notification that a pie or donut slice label is about to be drawn.
Notification that a pie or donut slice label is about to be drawn. This method is responsible for drawing the label and label background on to the canvas.
|canvas||The canvas on which to draw the label.|
|slice||The pie or donut slice.|
|labelBackgroundRect||The Rect which will be used to draw the label background.|
|series||The series which the pie slice belongs to.|