// Combine all of the given geometries into a single geometry.
static CanvasGeometry CombineGeometries(
TranslationContext context,
CanvasGeometry[] geometries,
MergePaths.MergeMode mergeMode)
{
switch (geometries.Length)
{
case 0:
return(null);
case 1:
return(geometries[0]);
}
// If MergeMode.Merge and they're all paths with the same FilledRegionDetermination,
// combine into a single path.
if (mergeMode == MergePaths.MergeMode.Merge &&
geometries.All(g => g.Type == CanvasGeometry.GeometryType.Path) &&
geometries.Select(g => ((CanvasGeometry.Path)g).FilledRegionDetermination).Distinct().Count() == 1)
{
return(Paths.MergePaths(geometries.Cast <CanvasGeometry.Path>().ToArray()));
}
else
{
if (geometries.Length > 50)
{
// There will be stack overflows if the CanvasGeometry.Combine is too large.
// Usually not a problem, but handle degenerate cases.
context.Issues.MergingALargeNumberOfShapesIsNotSupported();
geometries = geometries.Take(50).ToArray();
}
var combineMode = ConvertTo.GeometryCombine(mergeMode);
#if PreCombineGeometries
return(CanvasGeometryCombiner.CombineGeometries(geometries, combineMode));
#else
var accumulator = geometries[0];
for (var i = 1; i < geometries.Length; i++)
{
accumulator = accumulator.CombineWith(geometries[i], Sn.Matrix3x2.Identity, combineMode);
}
return(accumulator);
#endif
}
}
public static CanvasGeometryCombine GeometryCombine(MergePaths.MergeMode mergeMode)
{
switch (mergeMode)
{
case MergePaths.MergeMode.Add: return(CanvasGeometryCombine.Union);
case MergePaths.MergeMode.Subtract: return(CanvasGeometryCombine.Exclude);
case MergePaths.MergeMode.Intersect: return(CanvasGeometryCombine.Intersect);
// TODO - find out what merge should be - maybe should be a Union.
case MergePaths.MergeMode.Merge:
case MergePaths.MergeMode.ExcludeIntersections: return(CanvasGeometryCombine.Xor);
default:
throw new InvalidOperationException();
}
}
static CanvasGeometry MergeShapeLayerContent(ShapeContext context, Stack <ShapeLayerContent> stack, MergePaths.MergeMode mergeMode)
{
var pathFillType = context.Fill is null ? ShapeFill.PathFillType.EvenOdd : context.Fill.FillType;
var geometries = CreateCanvasGeometries(context, stack, pathFillType).ToArray();
switch (geometries.Length)
{
case 0:
return(null);
case 1:
return(geometries[0]);
default:
return(CombineGeometries(context, geometries, mergeMode));
}
}
// Merge the stack into a single shape. Merging is done recursively - the top geometry on the
// stack is merged with the merge of the remainder of the stack.
static CompositionShape TranslateMergePathsContent(ShapeContext context, Stack <ShapeLayerContent> stack, MergePaths.MergeMode mergeMode)
{
var mergedGeometry = MergeShapeLayerContent(context, stack, mergeMode);
if (mergedGeometry != null)
{
var result = context.ObjectFactory.CreateSpriteShape();
result.Geometry = context.ObjectFactory.CreatePathGeometry(new CompositionPath(mergedGeometry));
TranslateAndApplyShapeContext(
context,
result,
reverseDirection: false,
trimOffsetDegrees: 0);
return(result);
}
else
{
return(null);
}
}
static CanvasGeometry?MergeShapeLayerContent(ShapeContext context, Stack <ShapeLayerContent> stack, MergePaths.MergeMode mergeMode)
{
var pathFillType = context.Fill is null ? ShapeFill.PathFillType.EvenOdd : context.Fill.FillType;
var geometries = CreateCanvasGeometries(context, stack, pathFillType).ToArray();
return(geometries.Length switch
{
0 => null,
1 => geometries[0],
_ => CombineGeometries(context, geometries, mergeMode),
});
