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);
}