public override ICanvasImage GetRender(ICanvasResourceCreator resourceCreator, IList <Layerage> children)
{
Transformer transformer = base.Transform.Transformer;
CanvasGeometry geometry = transformer.ToRectangle(resourceCreator);
CanvasCommandList command = new CanvasCommandList(resourceCreator);
using (CanvasDrawingSession drawingSession = command.CreateDrawingSession())
{
if (this.Transform.IsCrop)
{
CanvasGeometry geometryCrop = this.Transform.CropTransformer.ToRectangle(resourceCreator);
CanvasGeometryRelation relation = geometry.CompareWith(geometryCrop);
switch (relation)
{
case CanvasGeometryRelation.Disjoint:
return(null);
case CanvasGeometryRelation.Contained:
this._patternRender(resourceCreator, drawingSession, geometry);
break;
case CanvasGeometryRelation.Contains:
this._patternRender(resourceCreator, drawingSession, geometryCrop);
break;
case CanvasGeometryRelation.Overlap:
Matrix3x2 zero = Matrix3x2.CreateTranslation(0.0f, 0.0f);
CanvasGeometry combine = geometry.CombineWith(geometryCrop, zero, CanvasGeometryCombine.Intersect);
this._patternRender(resourceCreator, drawingSession, combine);
break;
default:
return(null);
}
}
else
{
this._patternRender(resourceCreator, drawingSession, geometry);
}
}
return(command);
}
List <Rect> SplitGeometryIntoRectangles(CanvasGeometry geometry, float rectangleHeight, CanvasControl sender)
{
List <Rect> result = new List <Rect>();
var geometryBounds = geometry.ComputeBounds();
double left = geometryBounds.X;
double top = geometryBounds.Y;
double y = top;
while (y < geometryBounds.Bottom)
{
var lineRegion = new Rect(left, y, geometryBounds.Width, rectangleHeight);
var lineRegionGeometry = CanvasGeometry.CreateRectangle(sender, lineRegion);
var compareResult = geometry.CompareWith(lineRegionGeometry);
if (compareResult == CanvasGeometryRelation.Contains)
{
// The whole line fits.
result.Add(lineRegion);
}
else if (compareResult == CanvasGeometryRelation.Disjoint)
{
// The line doesn't fit, so skip it.
}
else if (compareResult == CanvasGeometryRelation.Overlap)
{
var intersection = geometry.CombineWith(lineRegionGeometry, Matrix3x2.Identity, CanvasGeometryCombine.Intersect);
PathReader pathReader = new PathReader(lineRegion);
intersection.Simplify(CanvasGeometrySimplification.Lines).SendPathTo(pathReader);
var rectangles = pathReader.GetRectangles();
rectangles.Sort(new RectangleComparer(CurrentTextDirection == TextDirection.RightToLeft));
result.AddRange(rectangles);
}
y += rectangleHeight;
}
return(result);
}
public static bool HasOverlaps(IEnumerable <Data.Path> paths, IEnumerable <Data.Path> otherPaths = null)
{
if (otherPaths != null)
{
using CanvasGeometry geom1 = MakeGeometry(paths),
geom2 = MakeGeometry(otherPaths);
return(geom1.CompareWith(geom2) != CanvasGeometryRelation.Disjoint);
}
else
{
var pathsList = paths.ToList();
for (int ix = 0; ix < pathsList.Count; ++ix)
{
var path = new[] { pathsList[ix] };
using var geom = MakeGeometry(path);
// Check for self-intersections
using (var evenOddGeom = MakeGeometry(path, CanvasFilledRegionDetermination.Alternate))
{
var selfIntersectingGeom = geom.CombineWith(
evenOddGeom, Matrix3x2.Identity, CanvasGeometryCombine.Exclude, float.Epsilon);
if (Math.Abs(selfIntersectingGeom.ComputeArea()) > float.Epsilon)
{
return(true);
}
}
// Check for overlaps with remaining paths
if (ix < pathsList.Count - 1)
{
using var other = MakeGeometry(pathsList.GetRange(ix + 1, pathsList.Count - (ix + 1)));
if (geom.CompareWith(other, Matrix3x2.Identity, float.Epsilon) != CanvasGeometryRelation.Disjoint)
{
return(true);
}
}
}
return(false);
}
}