C-Turtle
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Port of Python's Turtle to C++
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In Python, the `circle` function could do two kinds of jobs. 1. draw a full circle with given radius. e.g. `turtle.circle(100)` 2. draw an arc with given radius and extent....
"Undo" operations force a canvas invalidation due to top-level object removal. This means that the entire screen-- everything every turtle on the screen has drawn up to that point-- must...