public static Matrix3d P2M(this Viewport vp)
{
if (vp.PerspectiveOn)
{
return(new Matrix3d());
}
if (vp.Number == 1)
{
return(new Matrix3d());
}
return(vp.Dcs2Wcs() * vp.Dcs2Psdcs().Inverse());
}
/// <summary>
/// Checks if objects shown are inside VP extents
/// </summary>
/// <param name="scaleType"></param>
/// <param name="acVp"></param>
/// <param name="extents"></param>
/// <returns></returns>
private static bool IsInsideVpExtents(StandardScaleType scaleType, Viewport acVp, Extents3d extents)
{
acVp.StandardScale = scaleType;
var vpExt = acVp.GeometricExtents;
var xform = acVp.Dcs2Wcs() * acVp.Psdcs2Dcs();
var vpMin = vpExt.MinPoint.TransformBy(xform);
var vpMax = vpExt.MaxPoint.TransformBy(xform);
var solMin = extents.MinPoint;
var solMax = extents.MaxPoint;
if (vpMin.X < solMin.X && vpMin.Y < solMin.Y)
{
if (vpMax.X > solMax.X && vpMax.Y > solMax.Y)
{
return(true);
}
}
return(false);
}
/// <summary>
/// Gets the transformation matrix from the World Coordinate System (WCS)
/// to the specified model space viewport Display Coordinate System (DCS).
/// </summary>
/// <param name="vp">The instance to which this method applies.</param>
/// <returns>The WCS to DCS transformation matrix.</returns>
public static Matrix3d Wcs2Dcs(this Viewport vp)
{
return(vp.Dcs2Wcs().Inverse());
}