/*
* Calculates transform matrix from layout coordinate system to view coordinate system.
*/
private static Matrix2d LayoutTransform(RectangleF bounds, LinearLayoutDirection layoutDirection, LinearLayoutDirection flowDirection)
{
switch (layoutDirection)
{
case LinearLayoutDirection.LeftRight:
switch (flowDirection)
{
case LinearLayoutDirection.TopBottom:
return(new Matrix2d());
case LinearLayoutDirection.BottomTop:
return(Matrix2d.Translation(0, bounds.Height) * Matrix2d.Stretch(1, -1));
}
break;
case LinearLayoutDirection.RightLeft:
switch (flowDirection)
{
case LinearLayoutDirection.TopBottom:
return(Matrix2d.Translation(bounds.Width, 0) * Matrix2d.Stretch(-1, 1));
case LinearLayoutDirection.BottomTop:
return(Matrix2d.Translation(bounds.Width, bounds.Height) * Matrix2d.Stretch(-1, -1));
}
break;
case LinearLayoutDirection.TopBottom:
switch (flowDirection)
{
case LinearLayoutDirection.LeftRight:
return(Matrix2d.Rotation(90) * Matrix2d.Stretch(1, -1));
case LinearLayoutDirection.RightLeft:
return(Matrix2d.Translation(bounds.Width, 0) * Matrix2d.Rotation(90));
}
break;
case LinearLayoutDirection.BottomTop:
switch (flowDirection)
{
case LinearLayoutDirection.LeftRight:
return(Matrix2d.Translation(0, bounds.Height) * Matrix2d.Rotation(-90));
case LinearLayoutDirection.RightLeft:
return(Matrix2d.Translation(bounds.Width, bounds.Height) * Matrix2d.Stretch(-1, 1) * Matrix2d.Rotation(-90));
}
break;
}
var message = $"Layout direction {layoutDirection} is not compatible with flow direction {flowDirection}";
throw new ArgumentException(message);
}
