Possible LC bug. DistanceToAxis is not scaling with display scaling

[mat-d]

Hello

I believe I've found a lightning charts rendering bug in WPF.

To demonstrate the issue I've made a smal change to one of your projects to see if I can replicate a bug we have in our application, and was able to replicate the issue in ViewXY custom GDI+ Rendering Chart, in C# WPF .net framework 4.8


My change is to set label placement to manual
The pixel distances specified are not automatically scaling when the UI scale changes

Code: Select all

   private void CreateChart()
        {
            // Create a new chart.
            _chart = new LightningChart
            {
                ChartName = "ViewXY custom GDI+ rendering chart"
            };

            //begin change

            _chart.ViewXY.AxisLayout.YAxisTitleAutoPlacement = false;
            _chart.ViewXY.AxisLayout.XAxisTitleAutoPlacement = false;

            _chart.ViewXY.AxisLayout.AutoAdjustMargins = false;

            _chart.ViewXY.Margins = new System.Windows.Thickness(100, 100, 100, 100);

            _chart.ViewXY.XAxes[0].Title.DistanceToAxis = 50;
            _chart.ViewXY.YAxes[0].Title.DistanceToAxis = 50;

            // end change

this issue is affecting other label positioning settings too (such as the chart label offset)

scaling-position.png (47.26 KiB) Viewed 2999 times

thanks

Mat





EDIT:

full.png (692.03 KiB) Viewed 2996 times

here's the full chart at different scalings, the custom rendering position is erratic too,
but notice if I select the executable in file manager and set the properties :

compatibiilty > change hidpi settings > override hidpi scaling behaviour > system (enhanced) and run at 200% the text position is corrected but the custom rendering is different again.

[ArctionKestutis]

Not sure what you think is incorrect?

There are view things your should aware.

* LightningChart uses 2 types of units, DPI (Dots Per Inch) and PX (screen pixels). Most of the properties (especially if description does not tell otherwise) are using PX units. For example, Title.DistanceToAxis property is in PX. Chart Margins (ViewXY.Margins) are rare exception - it is in DIPs.

* In WinForms LightningChart DPI=PX no matter what Windows-scaling is. For WPF/UWP LightningChart, only 100% will give DPI=PX. For higher scaling PX > DPI units. In application, you can use LightningChart's DpiHelper class to convert between units.

* You did not specify how you did testing of all those 100-200% scaling. You should be aware, that sometimes application does not react to Windows->Settings->Display->Scale change until you sign-out or restart Windows.

Hope this helps.