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Matthias Clasen 2023-03-25 15:27:23 -04:00
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docs/reference/gtk/coordinates.md
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@ -3,15 +3,15 @@ Slug: gtk-coordinates
## Coordinate systems in GTK
Every widget in a window has its own coordinate system that it uses to place its
child widgets and to interpret events. Most of the time, this fact can be safely
ignored. The section will explain the details for the few cases when it is important.
All coordinate systems in GTK have the origin at the top left, with the X axis
pointing right, and the Y axis pointing down. This matches the convention used
in X11, Wayland and cairo, but differs from OpenGL and PostScript, where the origin
is in the lower left, and the Y axis is pointin up.
Every widget in a window has its own coordinate system that it uses to place its
child widgets and to interpret events. Most of the time, this fact can be safely
ignored. The section will explain the details for the few cases when it is important.
## The box model
When it comes to rendering, GTK follows the CSS box model as far as practical.