增加 export 命令

SpineViewerCLI/Extension.cs

@@ -0,0 +1,88 @@
+using SFML.Graphics;
+using SFML.System;
+using Spine;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SpineViewerCLI
+{
+    public static class Extension
+    {
+        /// <summary>
+        /// 获取一个对象副本, 继承所有状态
+        /// </summary>
+        public static SpineObject Copy(this SpineObject self, bool keepTrackTime = false)
+        {
+            var spineObject = new SpineObject(self, true);
+
+            // 拷贝轨道动画, 但是仅拷贝第一个条目
+            foreach (var tr in self.AnimationState.IterTracks().Where(t => t is not null))
+            {
+                var t = spineObject.AnimationState.SetAnimation(tr!.TrackIndex, tr.Animation, tr.Loop);
+                t.TimeScale = tr.TimeScale;
+                t.Alpha = tr.Alpha;
+                if (keepTrackTime)
+                    t.TrackTime = tr.TrackTime;
+            }
+
+            // XXX(#105): 部分 3.4.02 版本模型在设置动画后出现附件残留, 因此强制进行一次 Setup
+            if (spineObject.Version == SpineVersion.V34)
+            {
+                spineObject.Skeleton.SetSlotsToSetupPose();
+            }
+
+            spineObject.Update(0);
+            return spineObject;
+        }
+
+        /// <summary>
+        /// 获取当前状态包围盒
+        /// </summary>
+        public static FloatRect GetCurrentBounds(this SpineObject self)
+        {
+            self.Skeleton.GetBounds(out var x, out var y, out var w, out var h);
+            return new(x, y, Math.Max(w, 1e-6f), Math.Max(h, 1e-6f));
+        }
+
+        /// <summary>
+        /// 计算所有轨道第一个条目的动画时长最大值
+        /// </summary>
+        /// <param name="self"></param>
+        /// <returns></returns>
+        public static float GetAnimationMaxDuration(this SpineObject self)
+        {
+            return self.AnimationState.IterTracks().Select(t => t?.Animation.Duration ?? 0).DefaultIfEmpty(0).Max();
+        }
+
+        /// <summary>
+        /// 合并另一个矩形
+        /// </summary>
+        public static FloatRect Union(this FloatRect self, FloatRect rect)
+        {
+            float left = Math.Min(self.Left, rect.Left);
+            float top = Math.Min(self.Top, rect.Top);
+            float right = Math.Max(self.Left + self.Width, rect.Left + rect.Width);
+            float bottom = Math.Max(self.Top + self.Height, rect.Top + rect.Height);
+            return new(left, top, right - left, bottom - top);
+        }
+
+        /// <summary>
+        /// 按给定的帧率获取所有轨道第一个条目动画全时长包围盒大小, 是一个耗时操作, 如果可能的话最好缓存结果
+        /// </summary>
+        public static FloatRect GetAnimationBounds(this SpineObject self, float fps = 30)
+        {
+            using var copy = self.Copy();
+            var bounds = copy.GetCurrentBounds();
+            var maxDuration = copy.GetAnimationMaxDuration();
+            for (float tick = 0, delta = 1 / fps; tick < maxDuration; tick += delta)
+            {
+                bounds = bounds.Union(copy.GetCurrentBounds());
+                copy.Update(delta);
+            }
+            return bounds;
+        }
+    }
+}