permanent cursor offset if canvas scale is enabled

[Rene Poeschl]

I played around with the canvas scale and found that the cursor has a permanent offset to the mouse pointer if i activate it. See https://youtu.be/B7x7nkRNdjg

Application: kicad
Version: 5.1.2-f72e74a~84~ubuntu16.04.1, release build
Libraries:
    wxWidgets 3.0.2
    libcurl/7.47.0 OpenSSL/1.0.2g zlib/1.2.8 libidn/1.32 librtmp/2.3
Platform: Linux 4.15.0-48-generic x86_64, 64 bit, Little endian, wxGTK
Build Info:
    wxWidgets: 3.0.2 (wchar_t,wx containers,compatible with 2.8) GTK+ 2.24
    Boost: 1.58.0
    OpenCASCADE Community Edition: 6.8.0
    Curl: 7.47.0
    Compiler: GCC 5.4.0 with C++ ABI 1009

Build settings:
    USE_WX_GRAPHICS_CONTEXT=OFF
    USE_WX_OVERLAY=OFF
    KICAD_SCRIPTING=ON
    KICAD_SCRIPTING_MODULES=ON
    KICAD_SCRIPTING_PYTHON3=OFF
    KICAD_SCRIPTING_WXPYTHON=ON
    KICAD_SCRIPTING_WXPYTHON_PHOENIX=OFF
    KICAD_SCRIPTING_ACTION_MENU=ON
    BUILD_GITHUB_PLUGIN=ON
    KICAD_USE_OCE=ON
    KICAD_USE_OCC=OFF
    KICAD_SPICE=ON

[Michael Kavanagh (michaelkavanagh)]

Is this a bug? The tooltip of the scaling spin control states:

"Set the scale for the canvas.

On high-DPI displays on some platforms, KiCad cannot determine the
scaling factor. In this case you may need to set this to a value to
match your system's DPI scaling. 2.0 is a common value.

If this does not match the system DPI scaling, the canvas will
not match the window size and cursor position."

The last paragraph tells me this is expected.

[Wayne Stambaugh (stambaughw)]

Anyone else out there with a high dpi display please confirm this?

[Seth Hillbrand (sethh)]

Michael is right. Testing different scales in KiCad requires also changing the system DPI scale in the window manager.