revert line impl

src/main.rs

@@ -112,39 +112,27 @@ fn _bench(fb: &mut TGAImage) {
     }
 }
 
-fn line(a: Point2i, b: Point2i, color: TGAColor, fb: &mut TGAImage) {
-    let verts = line_verts(a, b);
-    for v in verts.into_iter() {
-        fb.set(v.x as u32, v.y as u32, color);
-    }
-}
-
-fn line_verts(mut a: Point2i, mut b: Point2i) -> Vec<Point2i> {
+fn line(mut a: Point2i, mut b: Point2i, color: TGAColor, fb: &mut TGAImage) {
     let is_steep = (a.x - b.x).abs() < (a.y - b.y).abs();
     if is_steep {
         std::mem::swap(&mut a.x, &mut a.y);
         std::mem::swap(&mut b.x, &mut b.y);
     }
     if a.x > b.x {
-        std::mem::swap(&mut a.x, &mut b.x);
-        std::mem::swap(&mut a.y, &mut b.y);
+        std::mem::swap(&mut a, &mut b);
     }
 
-    let mut verts: Vec<Point2i> = Vec::new();
-
     let step = (b.y - a.y) as f32 / (b.x - a.x) as f32;
     let mut y = a.y as f32;
     for x in (a.x)..b.x {
-        let p = if is_steep {
-            Point2i::new(y.round_ties_even() as i32, x)
+        let (px, py) = if is_steep {
+            (y.round_ties_even() as i32, x)
         } else {
-            Point2i::new(x, y.round_ties_even() as i32)
+            (x, y.round_ties_even() as i32)
         };
-        verts.push(p);
+        fb.set(px as u32, py as u32, color);
         y += step;
     }
-
-    verts
 }
 
 fn triangle_lines(a: Point2i, b: Point2i, c: Point2i, color: TGAColor, fb: &mut TGAImage) {