Hi.
I need to know the position of mouse click in axes coordinates. I’ve created a modifier for this:
public class CustomPointSelectionModifier : SeriesSelectionModifier
{
public override void OnModifierMouseUp(ModifierMouseArgs e)
{
base.OnModifierMouseUp(e);
var xcalc = ParentSurface.XAxes.First().GetCurrentCoordinateCalculator();
var ycalc = ParentSurface.YAxes.First().GetCurrentCoordinateCalculator();
var poistionPoint = Mouse.GetPosition((IInputElement)ParentSurface);
var point = new Point()
{
X = xcalc.GetDataValue(poistionPoint.X),
Y = ycalc.GetDataValue(poistionPoint.Y),
};
((SciChartMvvmBindingsViewModel)DataContext).OnMouseUp(e, point);
}
}
And it works well if axes width is zero. Otherwise, it provides values shifted by axes width (or height for Y-axis)
In my example, it should add an arrow annotation in a click point. Instead of this, it adds an arrow with shifted coordinates.
What am I doing wrong?
Thanks
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It works!! Thank you very much!!
- Alexander Erkabaev answered 4 years ago
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Hi Alex,
Only thing you’re doing wrong is not finding the related questions on this topic!
They are:
- https://www.scichart.com/questions/question/axis-getdatavalue-returns-unexpected-incorrect-value-when-a-chart-title-or-legend-is-present
- https://www.scichart.com/questions/question/modifiermouseargs-bug-report
There is also documentation on this topic here:
Axis APIs – Convert Pixel to Data Coordinates
Transforming Pixels to the Inner Viewport
Given a SciChartSurface with Axis on the left, a mouse-coordinate relative to the SciChartSurface must be transformed relative to the viewport (the central area) before the CoordinateCalculator API can be used. To do this, use the following code.var sciChartSurface = new SciChartSurface(); sciChartSurface.PreviewMouseDown += (s,e) => { // The mouse-point relative to the SciChartSurface Point xy = e.GetPosition(sciChartSurface); // Translates the mouse point (from root grid coords) to ModifierSurface coords Point x1y1 = sciChartSurface.RootGrid.TranslatePoint(xy, sciChartSurface.ModifierSurface); // you can now use this coordinate to convert to data values double dataValue = sciChartSurface.XAxis.GetCurrentCoordinateCalculator() .GetDataValue(x1y1.X); };
Let me know if this helps,
Best regards,
Andrew
- Andrew Burnett-Thompson answered 4 years ago
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