private void DrawEntity(Graphics graphics, ProjectedCircle circle, CadColor?layerColor, Vector offset)
{
// TODO: handle rotation
var width = circle.RadiusX * 2.0;
var height = circle.RadiusY * 2.0;
var topLeft = (Point)(circle.Center - new Point(circle.RadiusX, circle.RadiusX, 0.0) + offset);
graphics.DrawEllipse(ColorToPen(GetDisplayColor(layerColor, circle.OriginalCircle.Color)), (float)topLeft.X, (float)topLeft.Y, (float)width, (float)height);
}
public static ProjectedCircle Project(Circle circle, Layer layer, Matrix4 transform)
{
// find axis endpoints
var rightVector = Vector.RightVectorFromNormal(circle.Normal);
var upVector = circle.Normal.Cross(rightVector).Normalize();
var pt = transform.Transform(circle.Center + (rightVector * circle.Radius));
var qt = transform.Transform(circle.Center + (upVector * circle.Radius));
var m = transform.Transform(circle.Center);
return(ProjectedCircle.FromConjugateDiameters(circle, layer, m, pt, qt));
}
private static XElement ToXElement(ProjectedCircle circle)
{
var xml = new XElement(SvgPlotter.Xmlns + "ellipse",
new XAttribute("cx", circle.Center.X),
new XAttribute("cy", circle.Center.Y),
new XAttribute("rx", circle.RadiusX),
new XAttribute("ry", circle.RadiusY),
new XAttribute("fill-opacity", 0));
AddRotationTransform(xml, circle.Rotation, circle.Center);
AddStrokeIfNotDefault(xml, circle.OriginalCircle.Color);
return(xml);
}
public static ProjectedArc Project(Arc arc, Layer layer, Matrix4 transform)
{
// find the containing circle
var rightVector = Vector.RightVectorFromNormal(arc.Normal);
var upVector = arc.Normal.Cross(rightVector).Normalize();
var pt = transform.Transform(arc.Center + (rightVector * arc.Radius));
var qt = transform.Transform(arc.Center + (upVector * arc.Radius));
var m = transform.Transform(arc.Center);
var circle = ProjectedCircle.FromConjugateDiameters(null, layer, m, pt, qt);
// find the new start and end angles
var startPoint = transform.Transform(arc.EndPoint1);
var endPoint = transform.Transform(arc.EndPoint2);
var startAngle = (startPoint - circle.Center).ToAngle();
var endAngle = (endPoint - circle.Center).ToAngle();
return(new ProjectedArc(arc, layer, circle.Center, circle.RadiusX, circle.RadiusY, circle.Rotation, startAngle, endAngle, startPoint, endPoint));
}
