Masking
Explore how to use masking in Pycairo to create transparency effects by applying radial gradients and image surfaces as masks. Understand the steps to combine patterns and surfaces for sophisticated graphic outputs.
We'll cover the following...
We'll cover the following...
What is masking?
Masking paints a pattern through a mask, which can be another pattern or surface, such as an image surface.
Masking allows us to use any pattern as a transparency mask on any other pattern.
As we discussed previously, a pattern can be a solid color, gradient, image, or surface with vector content.
There are three stages to this.
First, we create the mask:
radial=cairo.RadialGradient(200, 200, 100, 200, 200, 200)
radial.add_color_stop_rgba(0, 0, 0, 0, 1)
radial.add_color_stop_rgba(1, 0, 0, 0, 0)
The pattern radial is a radial gradient. The center is (200, 200), the inner circle has a radius of 100, and the outer ...