feat: 实现喷枪功能

src/mscanvas.rs

@@ -1,4 +1,5 @@
 use iced::Point;
+use rand::prelude::*;
 
 #[derive(Debug, Clone, Copy, PartialEq)]
 pub struct MSColor {
@@ -540,7 +541,6 @@ impl MSCanvas {
     }
 
     pub fn stroke_rect1(&mut self, p1: Point, p2: Point) {
-        self.draw_cross_color(p1, MSColor::new(255, 0, 0, 255));
         let mut x = p1.x;
         let mut y = p1.y;
         let mut width = (p2.x - p1.x);
@@ -582,4 +582,21 @@ impl MSCanvas {
             self.pixels[index + 3] = 255; // A
         }
     }
+
+    /// 实现喷枪效果的函数
+    pub fn spray_paint(&mut self, center: Point, radius: i32, density: u32) {
+        let mut rng = rand::rng();
+
+        for _ in 0..density {
+            // 在给定半径内随机产生偏移量
+            let offset_x = rng.random_range(-radius..=radius);
+            let offset_y = rng.random_range(-radius..=radius);
+
+            // 确保我们只在圆形区域内绘制，而非整个正方形区域
+            if (offset_x * offset_x + offset_y * offset_y) <= (radius * radius) {
+                let point = Point::new(center.x + offset_x as f32, center.y + offset_y as f32);
+                self.draw_pixel_at(point);
+            }
+        }
+    }
 }