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70 lines
1.6 KiB
Rust
70 lines
1.6 KiB
Rust
use super::Shape;
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use crate::style::Color;
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/// Shape to draw a line from (x1, y1) to (x2, y2) with the given color
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pub struct Line {
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pub x1: f64,
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pub y1: f64,
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pub x2: f64,
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pub y2: f64,
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pub color: Color,
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}
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pub struct LineIterator {
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x: f64,
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y: f64,
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dx: f64,
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dy: f64,
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dir_x: f64,
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dir_y: f64,
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current: f64,
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end: f64,
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}
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impl Iterator for LineIterator {
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type Item = (f64, f64);
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fn next(&mut self) -> Option<Self::Item> {
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if self.current < self.end {
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let pos = (
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self.x + (self.current * self.dx) / self.end * self.dir_x,
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self.y + (self.current * self.dy) / self.end * self.dir_y,
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);
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self.current += 1.0;
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Some(pos)
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} else {
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None
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}
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}
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}
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impl<'a> IntoIterator for &'a Line {
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type Item = (f64, f64);
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type IntoIter = LineIterator;
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fn into_iter(self) -> Self::IntoIter {
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let dx = self.x1.max(self.x2) - self.x1.min(self.x2);
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let dy = self.y1.max(self.y2) - self.y1.min(self.y2);
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let dir_x = if self.x1 <= self.x2 { 1.0 } else { -1.0 };
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let dir_y = if self.y1 <= self.y2 { 1.0 } else { -1.0 };
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let end = dx.max(dy);
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LineIterator {
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x: self.x1,
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y: self.y1,
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dx,
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dy,
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dir_x,
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dir_y,
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current: 0.0,
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end,
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}
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}
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}
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impl<'a> Shape<'a> for Line {
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fn color(&self) -> Color {
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self.color
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}
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fn points(&'a self) -> Box<Iterator<Item = (f64, f64)> + 'a> {
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Box::new(self.into_iter())
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}
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}
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