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How to use canvas draw on a XamDataChart(series) get precise x axes position as like Ruler object
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Recently, I use canvas to plot on xamdatachart , also attempt get back x and y axes position, but it seem different object in develop frame.  

The information of position not correspond between canvas and xamdatacharth. i provide a figure which mark three red circle in x axes(date point)

and canvas line(dotted blue line). Actually, canvas line get x position can not precisely project in xamdatachart's x axes(date point). If any function 

which like "Ruler" object that auto provide xamdatachart x axes information without use canvas