ComponentOne for WPF: Text seems to render in the incorrect position?

Question

I’m running into problems when rendering text on my document. Specifically, the text renders too low. I tried filling a rectangle behind the text to see what happens, and I discovered that they appear to render slightly offset:

Here’s the code I used to render the box and text:

_doc.FillRectangle(Colors.LightGray, 36, 72, 37.344, 9);
_doc.DrawString("Lorem", new Font("Arial", 12), Colors.Black, 
   new Rect(36, 72, 37.344, 9));

I know that the height of the rectangle (9) doesn’t appear to match the height of the font (12), which I thought might have been the problem at first. However, I then did a MeasureString on the font itself and discovered that its height was actually 9 rather than 12 (I used the immediate window for this, which is why it's a pic and not a text block):

Any ideas as to what could be causing it and how to avoid it?

Thanks!

-Ari

Answer 1

Well, after further research and experimentation there's definitely a bug in the ComponentOne library. Specifically, the overload I happened to have used here returned the wrong hight. If you specific an available width explicitly, you get the correct height. Specifically, this code generates the correct data:

var resultHeight = _doc.MeasureString(text, pdfFont, double.MaxValue).Height;
var resultWidth = _doc.MeasureString(text, pdfFont).Width;

return new Tuple<double,double>(resultHeight, resultWidth);

Note the addition of the third parameter for the height only -- double.MaxValue. The width is correctly calculated in both cases, but the height is only correctly calculated if you provide that double parameter. I chose double.MaxValue in this case simply because I don't know how wide the string is going to turn out to be so I don't want to risk being given a multi-line height.