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|Home ChartPack BoxPlot Events OnBeforeRenderData|
|See also: OnBeforeBoxDraw, OnDataRendered, OnScalesRendered, SetCanvasFontSizeScaled|
The events OnBeforeRenderData, OnDataRendered and OnScalesRendered provide hooks for adding user defined graphics to a boxplot. Internally, a box plot is constructed in three phases before the result is copied to the screen: in the first phase the scales are drawn, then the boxes are drawn and finally the crosshairs are rendered. The OnScalesRendered event is triggered after the scales are drawn giving access to the non-data areas of TBoxPlot (i.e. the areas where the scales and captions are drawn). The events OnBeforeRenderData and OnDataRendered are triggered before and after drawing the boxplot diagram.
The event OnBeforeRenderData occurs immediately before the boxplot is drawn. The variable parameter Canvas provides access to the canvas of the data area. The parameters Top and Left contain the offset of the data area relative to the entire chart area.