feat: 实现颜色选择框

src/mscanvas.rs

@@ -58,20 +58,23 @@ impl MSColor {
     };
 
     pub fn into_color(self) -> Color {
-        Color::from_rgba8(
-            self.r,
-            self.g,
-            self.b,
-            (self.a / 255) as f32,
-        )
+        Color::from_rgba8(self.r, self.g, self.b, (self.a / 255) as f32)
+    }
+
+    /// rgb 十六进制
+    pub fn from_hex(n: i32) -> Self {
+        let r = (n >> 16) as u8;
+        let g = (n >> 8) as u8;
+        let b = n as u8;
+        Self { r, g, b, a: 0xff }
     }
 }
 
 #[derive(Clone, Copy, PartialEq)]
 struct Edge {
-    y_max: i32,      // 边的最大 y（不包含）
-    x: f32,          // 当前扫描线 y 处的 x 值
-    dx_dy: f32,      // 1 / slope = Δx / Δy
+    y_max: i32, // 边的最大 y（不包含）
+    x: f32,     // 当前扫描线 y 处的 x 值
+    dx_dy: f32, // 1 / slope = Δx / Δy
 }
 
 impl Edge {
@@ -677,13 +680,6 @@ impl MSCanvas {
         let min_sq = min_r * min_r;
         let max_sq = max_r * max_r;
 
-        let color = MSColor::new(
-            (255 + self.foreground_color.r) / 2,
-            self.foreground_color.g,
-            self.foreground_color.b,
-            self.foreground_color.a,
-        );
-
         let center_x = center.x as i32;
         let center_y = center.y as i32;
         for y in min_y..=max_y {
@@ -1040,7 +1036,10 @@ impl MSCanvas {
                     let x_start = active_edges[i].x.ceil() as i32;
                     let x_end = active_edges[i + 1].x.floor() as i32;
                     for x in x_start..=x_end {
-                        self.draw_pixel_color_at(Point::new(x as f32, y as f32), self.background_color);
+                        self.draw_pixel_color_at(
+                            Point::new(x as f32, y as f32),
+                            self.background_color,
+                        );
                     }
                 }
             }