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Drawing Surfaces

Code that paints on a drawing surface should be bracketed by calls to functions surface:begin() and and surface:theEnd(). Function surface:begin() return the drawing port descriptor than should be used to call painting functions.

• When using qlua, both the drawing surfaces descriptors and the drawing port descriptors are the descriptors returned by the high level interface of package qtwidget. All the painting functions defined by package qtwidget are therefore available. However, to write portable code, you must restrict yourself to the Cairo-style functions defined for the drawing port descriptors.

• When using the ordinary Lua interpreter, the drawing surface descriptors are tables containing Cairo windows or Cairo surfaces. The drawing port descriptors are Cairo drawing contexts. Therefore all the painting functions defined by package lcairo are available.

Subsections

1. surface:begin()
2. surface:theEnd()
3. surface:refresh()
4. surface.width
5. surface.height
6. surface:close()
7. surface:valid()
8. surface:onResize(f)
9. surface:write_to_png(filename)
10. surface:toTensor()