重构

Spine/Exporters/Extension.cs

@@ -0,0 +1,59 @@
+using SFML.Graphics;
+using SFML.System;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Spine.Exporters
+{
+    public static class Extension
+    {
+        /// <summary>
+        /// 获取适合指定画布参数下能够覆盖包围盒的画布视区包围盒
+        /// </summary>
+        public static FloatRect GetCanvasBounds(this FloatRect self, Vector2u resolution) => GetCanvasBounds(self, resolution, 0, 0);
+
+        /// <summary>
+        /// 获取适合指定画布参数下能够覆盖包围盒的画布视区包围盒
+        /// </summary>
+        public static FloatRect GetCanvasBounds(this FloatRect self, Vector2u resolution, uint margin) => GetCanvasBounds(self, resolution, margin, 0);
+
+        /// <summary>
+        /// 获取适合指定画布参数下能够覆盖包围盒的画布视区包围盒
+        /// </summary>
+        public static FloatRect GetCanvasBounds(this FloatRect self, Vector2u resolution, uint margin, uint padding)
+        {
+            float sizeW = self.Width;
+            float sizeH = self.Height;
+            float innerW = resolution.X - padding * 2;
+            float innerH = resolution.Y - padding * 2;
+            var scale = Math.Max(Math.Abs(sizeW / innerW), Math.Abs(sizeH / innerH)); // 取两方向上较大的缩放比, 以此让画布可以覆盖内容
+            var scaleW = scale * Math.Sign(sizeW);
+            var scaleH = scale * Math.Sign(sizeH);
+
+            innerW *= scaleW;
+            innerH *= scaleH;
+
+            var x = self.Left - (innerW - sizeW) / 2 - (margin + padding) * scaleW;
+            var y = self.Top - (innerH - sizeH) / 2 - (margin + padding) * scaleH;
+            var w = (resolution.X + margin * 2) * scaleW;
+            var h = (resolution.Y + margin * 2) * scaleH;
+            return new(x, y, w, h);
+        }
+
+        /// <summary>
+        /// 获取视区的包围盒
+        /// </summary>
+        public static FloatRect GetBounds(this View self)
+        {
+            return new(
+                self.Center.X - self.Size.X / 2,
+                self.Center.Y - self.Size.Y / 2,
+                self.Size.X,
+                self.Size.Y
+            );
+        }
+    }
+}