PyCairo - How we can get fill extents?

PyCairo - How we can get fill extents?

In PyCairo, you can retrieve the fill extents of a path using the fill_extents() method. This method returns a tuple (x1, y1, x2, y2), which represents the bounding box that encloses the filled areas of the current path. Note that the returned extents might be larger than the actual area covered by the path.

Here's a simple example:

import cairo # Create an image surface WIDTH, HEIGHT = 300, 300 surface = cairo.ImageSurface(cairo.FORMAT_ARGB32, WIDTH, HEIGHT) ctx = cairo.Context(surface) # Initial draw: Fill with white ctx.set_source_rgb(1, 1, 1) ctx.paint() # Create a simple path ctx.arc(150, 150, 100, 0, 3.14159) # Half-circle # Get fill extents x1, y1, x2, y2 = ctx.fill_extents() # Fill the path ctx.set_source_rgb(0, 0, 1) # Blue color ctx.fill() # Draw a rectangle based on the extents, to visually see the bounds ctx.set_source_rgba(1, 0, 0, 0.5) # Semi-transparent red color ctx.rectangle(x1, y1, x2 - x1, y2 - y1) ctx.stroke() # Save the image to a file surface.write_to_png("output.png")

In this example:

  1. We create a half-circle path.
  2. We retrieve the fill extents of this path using the fill_extents() method.
  3. We fill the half-circle with blue.
  4. We then draw a semi-transparent red rectangle based on the retrieved extents.

When you look at output.png, you'll see the blue half-circle and the rectangle that represents the bounding box (fill extents) of this half-circle.

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