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Display Scaling

Display scaling (DPI scaling) is a setting that allows the operating system to stretch a window to be larger than its original size. Viewing native resolution images on scaled displays may cause lines and text to appear very small. Increasing ScottPlot’s ScaleFactor to match the screen’s display scaling may result in a more comfortable viewing experience for the user. See the ScottPlot Cookbook for more information.

Scale Factor = 1

Scale Factor = 2

ScottPlot.Plot myPlot = new();

myPlot.ScaleFactor = 2;

myPlot.SavePng("demo.png", 400, 300);

Mouse Position in WPF Applications

WPF applications support display scaling, but the pixel position of the mouse is reported in unscaled units. Users desiring mouse-interactive behavior in WPF applications must multiple mouse position by WpfPlot.DisplayScale to compensate for this before passing coordinates into ScottPlot.

public partial class DisplayScaling : Window
    public DisplayScaling()

        // add a crosshair to the plot
        var cross = WpfPlot1.Plot.Add.Crosshair(0, 0);

        // move the crosshair to track the cursor
        MouseMove += (s, e) => {
            Point p = e.GetPosition(WpfPlot1);
            ScottPlot.Pixel mousePixel = new(p.X * WpfPlot1.DisplayScale, p.Y * WpfPlot1.DisplayScale);
            ScottPlot.Coordinates coordinates = WpfPlot1.Plot.GetCoordinates(mousePixel);
            cross.Position = coordinates;

Refer to the WPF demo application in the ScottPlot GitHub repository for full source code.