on create form chart. RecalcWidthHeight;//initialize cahrt bounds. chart.autorepaint:=false;//no auoto everything is zero: IStartPos, IEndPos,IAxisSize. becasuse no painting occurs for a Horizontal axis: Arect:=chart.BoundsRect;//i.e: arect=(0,0,500,500) in axis.AdjustMaxMinRect(Arect): Procedure Re...

I use a simple method: Chart.Autorepaint:=false; .... set chart operations ..... Chart.Autorepaint:=true; Chart.Repaint; I need to set IAxisSize on loading, because I use some functions and properties: axis.CalcPosValue, axis.increment, axis.setminmax. if IAxisSize =0 then CalcPosValue is always zer...

I need to calculate IAxisSize for some calculations for drawing. But, I need to before draw. Also, I dont want to paint chart for twice, since program slows down.

For AdjustMaxMinRect, if we supply a rect calculated by EndPosition&StartPosition properties, then we have a non zero IAxisSize.

I think for copying an axis:
on TChartAxis.Assign, OnDrawLabel event may be assigned too.

I tried to do below code onbeforedrawchart event: Numpixels:=abs(scandle.CalcXPos(scandle.LastValueIndex)-scandle.CalcXPos(scandle.FirstValueIndex))+2; PixelPerbar:=math.Max(1,trunc(Numpixels/NumBars+1)-Scandle.pen.width-2); if pixelperbar>=20 then Begin scandle.CandleWidth:=20; ENd else Scandle.Can...