feat: 实现多边形功能

src/mscanvas.rs

@@ -37,6 +37,20 @@ impl MSColor {
     };
 }
 
+pub struct Path2D {
+    points: Vec<Point>,
+}
+
+impl Path2D {
+    pub fn new() -> Self {
+        Self { points: vec![] }
+    }
+
+    pub fn push(&mut self, point: Point) {
+        self.points.push(point);
+    }
+}
+
 pub struct MSCanvas {
     width: i32,
     height: i32,
@@ -50,6 +64,8 @@ pub struct MSCanvas {
     color: MSColor,
 
     line_width: i32,
+
+    path2d: Path2D,
 }
 
 #[allow(unused)]
@@ -62,6 +78,7 @@ impl MSCanvas {
             pixels_bak: Vec::new(),
             color: MSColor::BLACK,
             line_width: 1,
+            path2d: Path2D::new(),
         }
     }
 
@@ -635,6 +652,37 @@ impl MSCanvas {
         let points = vec![begin, p1, p2, end];
         self.bezier(points);
     }
+
+    pub fn begin_path(&mut self) {
+        self.path2d = Path2D::new();
+    }
+
+    pub fn close_path(&mut self) {
+        let points = &self.path2d.points;
+        if points.len() < 3 {
+            return;
+        }
+        self.path2d.push(points[0]);
+    }
+
+    pub fn move_to(&mut self, point: Point) {
+        self.path2d.push(point);
+    }
+
+    pub fn line_to(&mut self, point: Point) {
+        self.path2d.push(point);
+    }
+
+    pub fn stroke(&mut self) {
+        let mut points = self.path2d.points.clone();
+        if points.len() < 2 {
+            return;
+        }
+        // 连线
+        for i in 0..(points.len() - 1) {
+            self.draw_line_with_circle_brush(points[i], points[i + 1]);
+        }
+    }
 }
 
 fn point_muln(point: Point, t: f32) -> Point {