public static XElement ToXElement(this DxfEllipse ellipse)
{
XElement baseShape;
if (IsCloseTo(ellipse.StartParameter, 0.0) && IsCloseTo(ellipse.EndParameter, Math.PI * 2.0))
{
baseShape = new XElement(DxfToSvgConverter.Xmlns + "ellipse",
new XAttribute("cx", ellipse.Center.X.ToDisplayString()),
new XAttribute("cy", ellipse.Center.Y.ToDisplayString()),
new XAttribute("rx", ellipse.MajorAxis.Length.ToDisplayString()),
new XAttribute("ry", ellipse.MinorAxis().Length.ToDisplayString()));
}
else
{
var path = ellipse.GetSvgPath();
baseShape = new XElement(DxfToSvgConverter.Xmlns + "path",
new XAttribute("d", path.ToString()));
}
baseShape.Add(new XAttribute("fill-opacity", 0));
return(baseShape
.AddStroke(ellipse.Color)
.AddStrokeWidth(1.0)
.AddVectorEffect());
}
public void RenderEllipseTest()
{
var ellipse = new DxfEllipse(new DxfPoint(1.0, 2.0, 3.0), new DxfVector(1.0, 0.0, 0.0), 0.5)
{
StartParameter = 0.0,
EndParameter = Math.PI / 2.0 // 90 degrees
};
var path = ellipse.GetSvgPath();
Assert.Equal(2, path.Segments.Count);
var move = (SvgMoveToPath)path.Segments[0];
AssertClose(2.0, move.LocationX);
AssertClose(2.0, move.LocationY);
var arcSegment = (SvgArcToPath)path.Segments[1];
AssertClose(1.0, arcSegment.EndPointX);
AssertClose(2.5, arcSegment.EndPointY);
Assert.Equal(1.0, arcSegment.RadiusX);
Assert.Equal(0.5, arcSegment.RadiusY);
Assert.Equal(0.0, arcSegment.XAxisRotation);
Assert.False(arcSegment.IsLargeArc);
Assert.True(arcSegment.IsCounterClockwiseSweep);
var expected = new XElement("path",
new XAttribute("d", path.ToString()),
new XAttribute("fill-opacity", "0"),
new XAttribute("stroke-width", "1.0px"),
new XAttribute("vector-effect", "non-scaling-stroke"));
var actual = ellipse.ToXElement();
AssertXElement(expected, actual);
}
public void EllipsePathOf180DegreesTest()
{
var ellipse = new DxfEllipse(new DxfPoint(0.0, 0.0, 0.0), new DxfVector(1.0, 0.0, 0.0), 0.5)
{
StartParameter = 0.0,
EndParameter = Math.PI
};
var path = ellipse.GetSvgPath();
Assert.Equal(3, path.Segments.Count);
var move = (SvgMoveToPath)path.Segments[0];
AssertClose(1.0, move.LocationX);
AssertClose(0.0, move.LocationY);
// 180 degree ellipses are difficult to render; split it into two 90s
var first = (SvgArcToPath)path.Segments[1];
AssertClose(0.0, first.EndPointX);
AssertClose(0.5, first.EndPointY);
Assert.Equal(1.0, first.RadiusX);
Assert.Equal(0.5, first.RadiusY);
Assert.Equal(0.0, first.XAxisRotation);
Assert.False(first.IsLargeArc);
Assert.True(first.IsCounterClockwiseSweep);
var second = (SvgArcToPath)path.Segments[2];
AssertClose(-1.0, second.EndPointX);
AssertClose(0.0, second.EndPointY);
Assert.Equal(1.0, second.RadiusX);
Assert.Equal(0.5, second.RadiusY);
Assert.Equal(0.0, second.XAxisRotation);
Assert.False(second.IsLargeArc);
Assert.True(second.IsCounterClockwiseSweep);
}