computeWorldVertices method

void computeWorldVertices(Slot slot, int start, int count, Float32List worldVertices, int offset, int stride,)

Implementation

void computeWorldVertices(Slot slot, int start, int count,
    Float32List worldVertices, int offset, int stride) {
  count = offset + (count >> 1) * stride;
  final Skeleton skeleton = slot.bone.skeleton;
  final Float32List deformArray = slot.attachmentVertices;
  Float32List? vertices = this.vertices;
  final Int32List? bones = this.bones;
  if (bones == null) {
    if (deformArray.isNotEmpty) vertices = deformArray;
    final Bone bone = slot.bone;
    final double x = bone.worldX;
    final double y = bone.worldY;
    final double a = bone.a, b = bone.b, c = bone.c, d = bone.d;
    for (int v = start, w = offset; w < count; v += 2, w += stride) {
      final double vx = vertices![v], vy = vertices[v + 1];
      worldVertices[w] = vx * a + vy * b + x;
      worldVertices[w + 1] = vx * c + vy * d + y;
    }
    return;
  }
  int v = 0, skip = 0;
  for (int i = 0; i < start; i += 2) {
    final int n = bones[v];
    v += n + 1;
    skip += n;
  }
  final List<Bone> skeletonBones = skeleton.bones;
  if (deformArray.isEmpty) {
    for (int w = offset, b = skip * 3; w < count; w += stride) {
      double wx = 0.0, wy = 0.0;
      int n = bones[v++];
      n += v;
      for (; v < n; v++, b += 3) {
        final Bone bone = skeletonBones[bones[v]];
        final double vx = vertices![b],
            vy = vertices[b + 1],
            weight = vertices[b + 2];
        wx += (vx * bone.a + vy * bone.b + bone.worldX) * weight;
        wy += (vx * bone.c + vy * bone.d + bone.worldY) * weight;
      }
      worldVertices[w] = wx;
      worldVertices[w + 1] = wy;
    }
  } else {
    final Float32List deform = deformArray;
    for (int w = offset, b = skip * 3, f = skip << 1;
        w < count;
        w += stride) {
      double wx = 0.0, wy = 0.0;
      int n = bones[v++];
      n += v;
      for (; v < n; v++, b += 3, f += 2) {
        final Bone bone = skeletonBones[bones[v]];
        final double vx = vertices![b] + deform[f],
            vy = vertices[b + 1] + deform[f + 1],
            weight = vertices[b + 2];
        wx += (vx * bone.a + vy * bone.b + bone.worldX) * weight;
        wy += (vx * bone.c + vy * bone.d + bone.worldY) * weight;
      }
      worldVertices[w] = wx;
      worldVertices[w + 1] = wy;
    }
  }
}