255 lines
9.2 KiB
C#
255 lines
9.2 KiB
C#
using NLog;
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using SkiaSharp;
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using Spine.Interfaces.Attachments;
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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namespace Spine.Interfaces
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{
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/// <summary>
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/// 命中测试等级枚举值
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/// </summary>
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public enum HitTestLevel { Bounds, Meshes, Pixels }
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public static class SpineExtension
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{
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private static readonly Logger _logger = LogManager.GetCurrentClassLogger();
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/// <summary>
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/// 命中检测精确度等级
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/// </summary>
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public static HitTestLevel HitTestLevel { get; set; } = HitTestLevel.Bounds;
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/// <summary>
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/// 命中测试时输出命中的插槽名称
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/// </summary>
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public static bool LogHitSlots { get; set; }
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/// <summary>
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/// 获取当前状态包围盒
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/// </summary>
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public static void GetBounds(this ISlot self, out float x, out float y, out float w, out float h)
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{
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float[] vertices = new float[8];
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int verticesLength = 0;
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var attachment = self.Attachment;
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switch (attachment)
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{
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case IRegionAttachment:
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case IMeshAttachment:
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verticesLength = attachment.ComputeWorldVertices(self, ref vertices);
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break;
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default:
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break;
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}
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if (verticesLength > 0)
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{
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float minX = int.MaxValue;
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float minY = int.MaxValue;
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float maxX = int.MinValue;
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float maxY = int.MinValue;
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for (int ii = 0; ii + 1 < verticesLength; ii += 2)
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{
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float vx = vertices[ii];
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float vy = vertices[ii + 1];
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minX = Math.Min(minX, vx);
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minY = Math.Min(minY, vy);
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maxX = Math.Max(maxX, vx);
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maxY = Math.Max(maxY, vy);
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}
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x = minX;
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y = minY;
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w = maxX - minX;
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h = maxY - minY;
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}
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else
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{
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x = self.Bone.WorldX;
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y = self.Bone.WorldY;
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w = 0;
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h = 0;
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}
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}
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/// <summary>
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/// 获取当前状态包围盒
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/// </summary>
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public static void GetBounds(this ISkeleton self, out float x, out float y, out float w, out float h)
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{
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float minX = int.MaxValue;
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float minY = int.MaxValue;
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float maxX = int.MinValue;
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float maxY = int.MinValue;
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foreach (var slot in self.IterDrawOrder())
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{
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if (slot.A <= 0 || !slot.Bone.Active || slot.Disabled)
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continue;
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float[] vertices = new float[8];
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int verticesLength = 0;
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var attachment = slot.Attachment;
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switch (attachment)
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{
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case IRegionAttachment:
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case IMeshAttachment:
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verticesLength = attachment.ComputeWorldVertices(slot, ref vertices);
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break;
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default:
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break;
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}
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for (int ii = 0; ii + 1 < verticesLength; ii += 2)
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{
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float vx = vertices[ii];
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float vy = vertices[ii + 1];
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minX = Math.Min(minX, vx);
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minY = Math.Min(minY, vy);
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maxX = Math.Max(maxX, vx);
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maxY = Math.Max(maxY, vy);
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}
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}
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x = minX;
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y = minY;
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w = maxX - minX;
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h = maxY - minY;
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}
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/// <summary>
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/// 命中测试, 当插槽全透明或者处于禁用或者骨骼处于未激活则无法命中
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/// </summary>
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/// <param name="precise">是否精确命中检测, 否则仅使用包围盒进行命中检测</param>
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/// <param name="cache">调用方管理的缓存表</param>
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public static bool HitTest(this ISlot self, float x, float y, Dictionary<SFML.Graphics.Texture, SFML.Graphics.Image> cache = null)
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{
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if (self.A <= 0 || !self.Bone.Active || self.Disabled)
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return false;
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if (HitTestLevel == HitTestLevel.Bounds)
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{
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self.GetBounds(out var bx, out var by, out var bw, out var bh);
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return x >= bx && x <= (bx + bw) && y >= by && y <= (by + bh);
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}
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else
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{
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float[] vertices = new float[8];
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int[] triangles;
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float[] uvs;
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SFML.Graphics.Texture tex;
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switch (self.Attachment)
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{
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case IRegionAttachment regionAttachment:
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_ = regionAttachment.ComputeWorldVertices(self, ref vertices);
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triangles = regionAttachment.Triangles;
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uvs = regionAttachment.UVs;
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tex = regionAttachment.RendererObject;
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break;
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case IMeshAttachment meshAttachment:
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_ = meshAttachment.ComputeWorldVertices(self, ref vertices);
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triangles = meshAttachment.Triangles;
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uvs = meshAttachment.UVs;
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tex = meshAttachment.RendererObject;
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break;
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default:
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return false;
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}
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var trianglesLength = triangles.Length;
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for (int i = 0; i + 2 < trianglesLength; i += 3)
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{
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var idx0 = triangles[i] << 1;
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var idx1 = triangles[i + 1] << 1;
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var idx2 = triangles[i + 2] << 1;
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float x0 = vertices[idx0] - x, y0 = vertices[idx0 + 1] - y;
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float x1 = vertices[idx1] - x, y1 = vertices[idx1 + 1] - y;
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float x2 = vertices[idx2] - x, y2 = vertices[idx2 + 1] - y;
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float c0 = Cross(x0, y0, x1, y1);
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float c1 = Cross(x1, y1, x2, y2);
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float c2 = Cross(x2, y2, x0, y0);
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// 判断是否全部同号 (或为 0, 点在边上)
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if ((c0 >= 0 && c1 >= 0 && c2 >= 0) || (c0 <= 0 && c1 <= 0 && c2 <= 0))
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{
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if (HitTestLevel == HitTestLevel.Meshes)
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return true;
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float u0 = uvs[idx0], v0 = uvs[idx0 + 1];
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float u1 = uvs[idx1], v1 = uvs[idx1 + 1];
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float u2 = uvs[idx2], v2 = uvs[idx2 + 1];
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float inv = 1 / (c0 + c1 + c2);
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float w0 = c1 * inv;
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float w1 = c2 * inv;
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float w2 = c0 * inv;
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float u = u0 * w0 + u1 * w1 + u2 * w2;
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float v = v0 * w0 + v1 * w1 + v2 * w2;
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SFML.Graphics.Image img = null;
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if (cache is not null)
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{
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if (!cache.TryGetValue(tex, out img))
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{
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img = cache[tex] = tex.CopyToImage();
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}
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}
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else
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{
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img = tex.CopyToImage();
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}
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var texSize = img.Size;
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var pixel = img.GetPixel((uint)(u * texSize.X), (uint)(v * texSize.Y));
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bool hit = pixel.A > 0;
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// 无缓存需要立即释放资源
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if (cache is null)
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{
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img.Dispose();
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}
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return hit;
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}
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}
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return false;
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}
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}
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/// <summary>
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/// 逐插槽的命中测试, 命中后会提前返回结果中止计算
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/// </summary>
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public static bool HitTest(this ISkeleton self, float x, float y)
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{
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var cache = new Dictionary<SFML.Graphics.Texture, SFML.Graphics.Image>();
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bool hit = false;
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List<string> slotNames = [];
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foreach (var st in self.IterDrawOrder().Reverse())
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{
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if (st.HitTest(x, y, cache))
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{
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hit = true;
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if (!LogHitSlots)
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break;
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slotNames.Add(st.Name);
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}
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}
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foreach (var img in cache.Values) img.Dispose();
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if (LogHitSlots && slotNames.Count > 0)
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{
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_logger.Debug("Hit ({0}): [{1}]", self.Name, string.Join(", ", slotNames));
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}
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return hit;
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}
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/// <summary>
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/// 向量叉积
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/// </summary>
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private static float Cross(float x0, float y0, float x1, float y1) => x0 * y1 - y0 * x1;
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}
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}
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