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|Home ChartPack BoxPlot Events OnDataRendered|
|See also: OnBeforeRenderData, OnBeforeBoxDraw, OnScalesRendered, SetCanvasFontSizeScaled|
The events OnBeforeRenderData, OnDataRendered and OnScalesRendered provide hooks for adding user defined graphics to an boxplot. Internally, a boxplot 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 diagram.
The event OnDataRendered occurs after the boxplot diagram has been drawn and before the crosshairs are inserted and the chart is copied to the screen. The variable parameter Canvas provides access to the canvas of the data area. Please note that the state of the canvas (e.g. the color of its pen, or the fill mode of the brush) depends on the graphics elements drawn before. The parameters Top and Left contain the offset of the data area relative to the entire chart area.