Scaling
Explore how scaling transforms in Pycairo affect vector graphics by modifying the user coordinate system. Learn to apply equal and unequal scaling to enlarge, reduce, or distort shapes such as squares and circles. Understand how scaling impacts coordinates, stroke widths, and fills to improve control over graphics rendering.
We'll cover the following...
Introduction to scaling
Scaling enlarges or reduces the user coordinate system. We can use this method to draw shapes of different sizes, without changing the drawing code.
We use the scale method of the Context to perform scaling:
ctx.scale(2, 2)
After scaling by
(2, 2), the point(x, y)in user space maps onto the point(x*2, y*2)in device space. One effect of that is that all the drawn objects become twice as large.
The diagram below shows the scaled user space. As we saw before, device space is unchanged by the transformation.
We draw a red square, located at (150, 200), with ...