Element: graphic_window.pre_vector_layer
Element: graphic_window.pre_vector_layerlayer
The layer containing any manual graphics renedered during the window's window.redraw callback. This layer, like all layers, is a member of the window.layers[] array, and it precedes all vector layers in the layer order. This restriction is maintained automatically.
This layer is created automatically on execution of the window.redraw callback when an attempt is made to draw graphics manually (e.g. via the draw or rasdraw commands). If no manual graphics are rendered, this layer is not created.
If no window.redraw is defined for the window, or no manual graphics are rendered during execution of it, the value of this element is null.
There is also a window.post_vector_layer for graphics rendered after the last vector layer has been painted.
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