feat: 椭圆支持线宽和一些重构

src/mscanvas.rs

@@ -87,8 +87,8 @@ impl Edge {
             return None;
         }
 
-        let dx = (bottom.x - top.x);
+        let dx = bottom.x - top.x;
-        let dy = (bottom.y - top.y);
+        let dy = bottom.y - top.y;
         let dx_dy = dx / dy;
 
         Some(Edge {
@@ -208,7 +208,7 @@ impl MSCanvas {
 
     pub fn pixel_at(&self, x: i32, y: i32) -> MSColor {
         // 边界检查
-        if x < 0 || x >= self.width || y < 0 || y >= self.height as i32 {
+        if x < 0 || x >= self.width || y < 0 || y >= self.height {
             return MSColor::ZERO;
         }
 
@@ -273,7 +273,7 @@ impl MSCanvas {
         }
 
         let xs = xs.clamp(0, self.width - 1);
-        let xe = xe.clamp(0, self.width as i32);
+        let xe = xe.clamp(0, self.width);
         for x in xs..xe {
             let index = ((y * self.width + x) * 4) as usize;
 
@@ -885,7 +885,7 @@ impl MSCanvas {
         }
 
         let xs = xs.clamp(0, self.width - 1);
-        let xe = xe.clamp(0, self.width as i32);
+        let xe = xe.clamp(0, self.width);
         for x in xs..xe {
             let index = ((y * self.width + x) * 4) as usize;
 
@@ -951,47 +951,63 @@ impl MSCanvas {
         self.bezier(points);
     }
 
+    /// 绘制带线宽的椭圆（描边）
+    /// - center: 椭圆中心
+    /// - rx, ry: 椭圆的水平/垂直半径（指中心线位置）
     pub fn stroke_ellipse(&mut self, center: Point, rx: f32, ry: f32) {
-        let mut x = 0.0;
+        if self.line_width <= 0 || rx <= 0.0 || ry <= 0.0 {
-        let mut y = ry; // 初始时将y设置为半高
+            return;
+        }
 
-        // 计算初始决策参数
+        // 外椭圆半径（膨胀）
-        let mut decision = ry * ry - rx * rx * ry + rx * rx / 4.0;
+        let outer_rx = rx;
+        let outer_ry = ry;
 
-        while ry * ry * x < rx * rx * y {
+        // 内椭圆半径（收缩）——不能为负
-            // 在每个阶段，根据对称性绘制四个方向上的点
+        let inner_rx = (rx - self.line_width as f32).max(0.0);
-            self.stroke_pixel_at(Point::new(center.x + x, center.y + y));
+        let inner_ry = (ry - self.line_width as f32).max(0.0);
-            self.stroke_pixel_at(Point::new(center.x - x, center.y + y));
-            self.stroke_pixel_at(Point::new(center.x + x, center.y - y));
-            self.stroke_pixel_at(Point::new(center.x - x, center.y - y));
 
-            if decision < 0.0 {
+        // 计算包围矩形（基于外椭圆）
-                x += 1.0;
+        let min_x = (center.x - outer_rx).ceil() as i32;
-                decision += 2.0 * ry * ry * x + ry * ry;
+        let max_x = (center.x + outer_rx).floor() as i32;
+        let min_y = (center.y - outer_ry).ceil() as i32;
+        let max_y = (center.y + outer_ry).floor() as i32;
+
+        // 预计算外椭圆参数
+        let outer_rx2 = outer_rx * outer_rx;
+        let outer_ry2 = outer_ry * outer_ry;
+        let outer_threshold = outer_rx2 * outer_ry2;
+
+        // 预计算内椭圆参数（仅当存在内区域时）
+        let (inner_rx2, inner_ry2, inner_threshold) = if inner_rx > 0.0 && inner_ry > 0.0 {
+            let rx2 = inner_rx * inner_rx;
+            let ry2 = inner_ry * inner_ry;
+            (rx2, ry2, rx2 * ry2)
         } else {
-                x += 1.0;
+            (0.0, 0.0, -1.0) // inner_threshold < 0 表示无内区域（实心圆）
-                y -= 1.0;
+        };
-                decision += 2.0 * ry * ry * x - 2.0 * rx * rx * y + ry * ry;
+
+        for y in min_y..=max_y {
+            for x in min_x..=max_x {
+                let dx = x as f32 - center.x;
+                let dy = y as f32 - center.y;
+
+                // 判断是否在外椭圆内
+                let outer_val = dx * dx * outer_ry2 + dy * dy * outer_rx2;
+                if outer_val > outer_threshold {
+                    continue; // 在外椭圆外
+                }
+
+                // 判断是否在内椭圆内（如果是，则跳过）
+                if inner_threshold >= 0.0 {
+                    let inner_val = dx * dx * inner_ry2 + dy * dy * inner_rx2;
+                    if inner_val <= inner_threshold {
+                        continue; // 在内椭圆内 → 不绘制（空心）
                     }
                 }
 
-        decision =
+                // 否则：在外椭圆内，且不在内椭圆内 → 属于描边区域
-            ry * ry * (x + 0.5) * (x + 0.5) + rx * rx * (y - 1.0) * (y - 1.0) - rx * rx * ry * ry;
+                self.stroke_pixel_at1(x, y);
-
-        while y > 0.0 {
-            // 同样地，根据对称性绘制四个方向上的点
-            self.stroke_pixel_at(Point::new(center.x + x, center.y + y));
-            self.stroke_pixel_at(Point::new(center.x - x, center.y + y));
-            self.stroke_pixel_at(Point::new(center.x + x, center.y - y));
-            self.stroke_pixel_at(Point::new(center.x - x, center.y - y));
-
-            if decision > 0.0 {
-                y -= 1.0;
-                decision += rx * rx - 2.0 * rx * rx * y;
-            } else {
-                x += 1.0;
-                y -= 1.0;
-                decision += 2.0 * ry * ry * x - 2.0 * rx * rx * y + rx * rx;
             }
         }
     }
@@ -1027,14 +1043,14 @@ impl MSCanvas {
             return;
         }
 
-        let rx = rx as f32;
+        let rx = rx;
-        let ry = ry as f32;
+        let ry = ry;
 
         // 计算包围矩形（整数边界）
-        let min_x = (center.x as f32 - rx).ceil() as i32;
+        let min_x = (center.x - rx).ceil() as i32;
-        let max_x = (center.x as f32 + rx).floor() as i32;
+        let max_x = (center.x + rx).floor() as i32;
-        let min_y = (center.y as f32 - ry).ceil() as i32;
+        let min_y = (center.y - ry).ceil() as i32;
-        let max_y = (center.y as f32 + ry).floor() as i32;
+        let max_y = (center.y + ry).floor() as i32;
 
         // 预计算常量：rx², ry², rx² * ry²
         let rx2 = rx * rx;
@@ -1043,8 +1059,8 @@ impl MSCanvas {
 
         for y in min_y..=max_y {
             for x in min_x..=max_x {
-                let dx = x as f32 - center.x as f32;
+                let dx = x as f32 - center.x;
-                let dy = y as f32 - center.y as f32;
+                let dy = y as f32 - center.y;
 
                 // 判断是否在椭圆内：dx²/ rx² + dy²/ ry² <= 1
                 // 等价于：dx² * ry² + dy² * rx² <= rx² * ry²
@@ -1197,14 +1213,6 @@ fn normalize_radian(radian: f32) -> f32 {
     r
 }
 
-#[inline]
-/// 辅助函数：计算两点间距离的平方（避免开方）
-fn distance_sq(a: Point, b: Point) -> f32 {
-    let dx = a.x - b.x;
-    let dy = a.y - b.y;
-    dx * dx + dy * dy
-}
-
 #[inline]
 /// 辅助函数：计算两点间距离的平方（避免开方）
 fn distance_sq1(a: (i32, i32), b: (i32, i32)) -> f32 {

src/paint.rs

@@ -766,15 +766,12 @@ impl PaintApp {
     }
 
     pub fn update_with_brush(&mut self, message: Message) {
-        let mut brush_fn: fn(&mut MSCanvas, Point) = MSCanvas::brush_circle;
+        let brush_fn = match self.get_brush_kind() {
-        if let Some(kind) = self.config.brush_kind {
-            brush_fn = match kind {
             BrushKind::Circle => MSCanvas::brush_circle,
             BrushKind::Square => MSCanvas::brush_square,
             BrushKind::Slash => MSCanvas::brush_slash,
             BrushKind::Backslash => MSCanvas::brush_backslash,
-            }
+        };
-        }
         match message {
             Message::MousePressed(pos) => {
                 self.is_drawing = true;
@@ -969,6 +966,24 @@ impl PaintApp {
         }
     }
 
+    fn close_polygon(&mut self) {
+        self.canvas.close_path();
+        match self.get_shape_style() {
+            ShapeStyle::Stroke => {
+                self.canvas.stroke();
+            }
+            ShapeStyle::Fill => {
+                self.canvas.fill();
+            }
+            ShapeStyle::FillAndStroke => {
+                self.canvas.fill_color(self.background_color);
+                self.canvas.fill();
+                self.canvas.fill_color(self.foreground_color);
+                self.canvas.stroke();
+            }
+        }
+    }
+
     pub fn update_with_polygon(&mut self, message: Message) {
         match message {
             Message::MousePressed(pos) => match self.control_state {
@@ -1005,23 +1020,9 @@ impl PaintApp {
                 }
             }
             Message::MouseDoubleClick(_pos) => {
-                self.canvas.close_path();
-                match self.get_shape_style() {
-                    ShapeStyle::Stroke => {
-                        self.canvas.stroke();
-                    }
-                    ShapeStyle::Fill => {
-                        self.canvas.fill();
-                    }
-                    ShapeStyle::FillAndStroke => {
-                        self.canvas.fill_color(self.background_color);
-                        self.canvas.fill();
-                        self.canvas.fill_color(self.foreground_color);
-                        self.canvas.stroke();
-                    }
-                }
                 self.is_drawing = false;
                 self.control_state = ControlState::Zero;
+                self.close_polygon();
                 self.dirty = true;
             }
             _ => {}
@@ -1131,21 +1132,7 @@ impl PaintApp {
         }
         if self.tool_selected == Tool::Polygon && self.control_state != ControlState::Zero {
             // 切换到其他工具，闭合路径
-            self.canvas.close_path();
+            self.close_polygon();
-            match self.get_shape_style() {
-                ShapeStyle::Stroke => {
-                    self.canvas.stroke();
-                }
-                ShapeStyle::Fill => {
-                    self.canvas.fill();
-                }
-                ShapeStyle::FillAndStroke => {
-                    self.canvas.fill_color(self.background_color);
-                    self.canvas.fill();
-                    self.canvas.fill_color(self.foreground_color);
-                    self.canvas.stroke();
-                }
-            }
             self.dirty = true;
         }