public void Process(SpriteProcessingContext ctx, Layer layer)
{
var pivotsByFrameId = ComputePivotPointsForLayer(ctx, layer);
if (pivotsByFrameId.Count == 0)
{
return;
}
foreach (var spriteDefinition in ctx.SpriteDefinitions)
{
Vector2 pivotPointPx;
if (!pivotsByFrameId.TryGetValue(spriteDefinition.Frame.FrameId, out pivotPointPx))
{
continue;
}
// normalise to sprite size
var boundingBox = spriteDefinition.MetaData.rect;
pivotPointPx -= boundingBox.min;
var pivotPointRel = Vector2.Scale(pivotPointPx, new Vector2(1.0f / boundingBox.width, 1.0f / boundingBox.height));
spriteDefinition.UpdatePivot(pivotPointRel);
}
}
static Dictionary <int, Vector2> ComputePivotPointsForLayer(SpriteProcessingContext ctx, Layer layer)
{
var pivotsByFrameId = new Dictionary <int, Vector2>();
var file = ctx.ImportContext.AseFile;
foreach (var frame in file)
{
Cel cel;
if (frame.TryGetCel(layer.Index, out cel))
{
Vector2 center;
if (cel.ComputeWeightedCenter(out center))
{
pivotsByFrameId.Add(frame.FrameId, center);
}
}
}
return(pivotsByFrameId);
}
