/// <summary> Measure the text using the default font of indicated graphics context. </summary>
/// <param name="display"> The display pointer, that specifies the connection to the X server. <see cref="IntPtr"/> </param>
/// <param name="gc"> The crapchics context to use for measuring. <see cref="IntPtr"/> </param>
/// <param name="text"> The text to measure. <see cref="X11.TChar[]"/> </param>
/// <returns> The measured size of the indicated text. <see cref="TSize"/> </returns>
public virtual TSize MeasureTextLine(IntPtr display, IntPtr gc, X11.TChar[] text)
{
TSize result = new TSize(5, 5);
if (display == IntPtr.Zero)
{
Console.WriteLine(CLASS_NAME + "::MeasureTextLine () ERROR: Argument null: display");
return(result);
}
if (gc == IntPtr.Zero)
{
Console.WriteLine(CLASS_NAME + "::MeasureTextLine () ERROR: Argument null: gc");
return(result);
}
TInt gcID = X11lib.XGContextFromGC(gc);
if (gcID != 0)
{
TInt direction = 0;
TInt fontAscent = 0;
TInt fontDescent = 0;
X11lib.XCharStruct xCharStruct = new X11lib.XCharStruct();
X11lib.XQueryTextExtents(display, gcID, text, (X11.TInt)text.Length, ref direction, ref fontAscent, ref fontDescent, ref xCharStruct);
result.Width = (int)xCharStruct.width;
result.Height = (int)fontAscent + (int)fontDescent;
}
else
{
Console.WriteLine(CLASS_NAME + "::MeasureTextLine () ERROR: Cannot investigate default font ressource ID of underlaying graphics context.");
}
return(result);
}