public static Matrix4 GetProjectionMatrix(this ViewPort viewPort, double width, double height, ProjectionStyle projectionStyle)
{
// create transform
Matrix4 transform;
switch (projectionStyle)
{
case ProjectionStyle.OriginTopLeft:
transform = viewPort.GetTransformationMatrixWindowsStyle(width, height);
break;
case ProjectionStyle.OriginBottomLeft:
transform = viewPort.GetTransformationMatrixCartesianStyle(width, height);
break;
case ProjectionStyle.OriginCenter:
transform = viewPort.GetTransformationMatrixDirect3DStyle(width, height);
break;
default:
throw new NotSupportedException();
}
return(transform);
}
public static IEnumerable <ProjectedEntity> ProjectTo2D(Drawing drawing, ViewPort viewPort, double width, double height, ProjectionStyle projectionStyle)
{
// create transform
Matrix4 transform;
switch (projectionStyle)
{
case ProjectionStyle.OriginTopLeft:
transform = viewPort.GetTransformationMatrixWindowsStyle(width, height);
break;
case ProjectionStyle.OriginBottomLeft:
transform = viewPort.GetTransformationMatrixCartesianStyle(width, height);
break;
case ProjectionStyle.OriginCenter:
transform = viewPort.GetTransformationMatrixDirect3DStyle(width, height);
break;
default:
throw new NotSupportedException();
}
// project all entities
var entities = new List <ProjectedEntity>();
foreach (var layer in from l in drawing.GetLayers()
where l.EntityCount > 0
orderby l.Name
select l)
{
foreach (var entity in layer.GetEntities().OrderBy(x => x.Id))
{
var projected = Project(entity, layer, transform);
if (projected != null)
{
entities.Add(projected);
}
}
}
return(entities);
}
public void TransformationMatrixDirect3DTest()
{
var viewPort = new ViewPort(Point.Origin, Vector.ZAxis, Vector.YAxis, 100.0);
var transform = viewPort.GetTransformationMatrixDirect3DStyle(200, 100);
var inverse = transform.Inverse();
// view port
// 0,100 200,100
//
// 0,0 200,0
//
// screen
// -1,1 1,1
//
// -1,-1 1,-1
// center
Assert.Equal(new Point(0, 0, 0), transform.Transform(new Point(100, 50, 0)));
Assert.Equal(new Point(100, 50, 0), inverse.Transform(new Point(0, 0, 0)));
// bottom left
Assert.Equal(new Point(-1, -1, 0), transform.Transform(new Point(0, 0, 0)));
Assert.Equal(new Point(0, 0, 0), inverse.Transform(new Point(-1, -1, 0)));
// bottom right
Assert.Equal(new Point(1, -1, 0), transform.Transform(new Point(200, 0, 0)));
Assert.Equal(new Point(200, 0, 0), inverse.Transform(new Point(1, -1, 0)));
// top left
Assert.Equal(new Point(-1, 1, 0), transform.Transform(new Point(0, 100, 0)));
Assert.Equal(new Point(0, 100, 0), inverse.Transform(new Point(-1, 1, 0)));
// top right
Assert.Equal(new Point(1, 1, 0), transform.Transform(new Point(200, 100, 0)));
Assert.Equal(new Point(200, 100, 0), inverse.Transform(new Point(1, 1, 0)));
}
