cairoPathExtents: cairoPathExtents
Description
Computes a bounding box in user-space coordinates covering the
points on the current path. If the current path is empty, returns
an empty rectangle ((0,0), (0,0)). Stroke parameters, fill rule,
surface dimensions and clipping are not taken into account.Usage
cairoPathExtents(cr)
Value
A list containing the following elements:
x1- [numeric] left of the resulting extents
y1- [numeric] top of the resulting extents
x2- [numeric] right of the resulting extents
y2- [numeric] bottom of the resulting extents
Details
Contrast with cairoFillExtents and cairoStrokeExtents which
return the extents of only the area that would be "inked" by
the corresponding drawing operations.
The result of cairoPathExtents is defined as equivalent to the
limit of cairoStrokeExtents with CAIRO_LINE_CAP_ROUND as the
line width approaches 0.0, (but never reaching the empty-rectangle
returned by cairoStrokeExtents for a line width of 0.0).
Specifically, this means that zero-area sub-paths such as
cairoMoveTo;cairoLineTo segments, (even degenerate cases
where the coordinates to both calls are identical), will be
considered as contributing to the extents. However, a lone
cairoMoveTo will not contribute to the results of
cairoPathExtents.
Since 1.6