Concave shapes are filled incorrectly #30
Description
When the turtle draws a concave shape with Turtle::begin_fill and Turtle::end_fill the fill color bleeds out of the bounds of the shape.
Build information:
rustc -V: rustc 1.23.0-nightly (827cb0d61 2017-11-26)
turtle: b3d0ef0
Host: KDE neon 5.11 (Ubuntu 16.04 LTS)
Screenshot:
Reproduction:
extern crate turtle;
use turtle::Turtle;
fn star(turtle: &mut Turtle, radius: f64, color: &str) {
let side = radius * ((5.0 / 8.0) - (5.0f64.sqrt() / 8.0)).sqrt() * (5.0f64.sqrt() - 1.0);
turtle.pen_up();
turtle.forward(radius);
turtle.right(162.0);
turtle.set_pen_color("black");
turtle.set_fill_color(color);
turtle.pen_down();
turtle.begin_fill();
for _ in 0..5 {
turtle.forward(side);
turtle.left(72.0);
turtle.forward(side);
turtle.right(144.0);
}
turtle.end_fill();
turtle.pen_up();
turtle.left(162.0);
turtle.backward(radius);
}
fn main() {
let mut turtle = Turtle::new();
star(&mut turtle, 200.0, "yellow");
}