private static XElement BuildLightComponent(IFilterLight filterLight, CoordinatesConverter coordinatesConverter)
{
if (filterLight is Spotlight spotlight)
{
SvgCoordinate3d startPosition = spotlight.LightSource.Pipe(coordinatesConverter.ToSvgCoord);
SvgCoordinate3d endPosition = spotlight.LightDestination.Pipe(coordinatesConverter.ToSvgCoord);
return
(XElementBuilder.WithName("feSpotLight")
.Add(
new XAttribute("x", startPosition.X),
new XAttribute("y", startPosition.Y),
new XAttribute("z", startPosition.Z),
new XAttribute("pointsAtX", endPosition.X),
new XAttribute("pointsAtY", endPosition.Y),
new XAttribute("pointsAtZ", endPosition.Z),
new XAttribute("specularExponent", spotlight.SpecularExponent),
new XAttribute("limitingConeAngle", spotlight.ConeAngle.Degrees)
)
.Build());
}
if (filterLight is DistantLight distantLight)
{
return(XElementBuilder.WithName("feDistantLight")
.Add(
new XAttribute("azimuth", distantLight.Azimuth.Degrees),
new XAttribute("elevation", distantLight.Elevation.Degrees))
.Build());
}
if (filterLight is PointLight pointLight)
{
var coordinate = coordinatesConverter.ToSvgCoord(pointLight.Coordinate);
return(XElementBuilder.WithName("fePointLight").Add(
new XAttribute("x", coordinate.X),
new XAttribute("y", coordinate.Y),
new XAttribute("z", coordinate.Z))
.Build());
}
throw new Exception($"unable to generate a light source from type '{filterLight}'");
}