[MS4W-Users] Use of fonttype bitmap and autofollow in C# mapscript 5.6.1

[Tiemens, Gerben]

Hello all,

I'm running into problems with my mapscript C#.  I had truetype fonts, but due to some restrictions I can't use them on the system anymore, so I switched to type Bitmap.
This will work, but only if I switch off  autofollow.


Case:  I have lines with labels. I had these labels with truetype and with autofollow --> MS_TRUE:
Working part:

Mapscript:



layerclass.label.color.setRGB(0, 0, 0);
layerclass.label.font = "Arial";
layerclass.label.size = 10;
//layerclass.label.size = (double)MS_BITMAP_FONT_SIZES.MS_SMALL;
layerclass.label.force = mapscript.MS_TRUE;
layerclass.label.type = MS_FONT_TYPE.MS_TRUETYPE;
//layerclass.label.type = MS_FONT_TYPE.MS_BITMAP;
layerclass.label.position = (int)MS_POSITIONS_ENUM.MS_UC;
layerclass.label.autoangle = mapscript.MS_TRUE;
layerclass.label.autofollow = mapscript.MS_TRUE;



This works..   resulting in mapfile and image:
LABEL
        ANGLE FOLLOW
        ANTIALIAS TRUE
        FONT "Arial"
        MAXSIZE 256
        MINSIZE 4
        SIZE 10
        TYPE TRUETYPE
        BUFFER 0
        COLOR 0 0 0
        FORCE TRUE
        MINDISTANCE -1
        MINFEATURESIZE -1
        OFFSET 0 0
        PARTIALS TRUE
        POSITION UC
  END


NOT WORKING PART:
However, if I change this to using the BITMAP fonttype, It gives me an error:

Mapscript:


layerclass.label.color.setRGB(0, 0, 0);
//layerclass.label.font = "Arial";
//layerclass.label.size = 10;
layerclass.label.size = (double)MS_BITMAP_FONT_SIZES.MS_SMALL;
layerclass.label.force = mapscript.MS_TRUE;
//layerclass.label.type = MS_FONT_TYPE.MS_TRUETYPE;
layerclass.label.type = MS_FONT_TYPE.MS_BITMAP;
layerclass.label.position = (int)MS_POSITIONS_ENUM.MS_UC;
layerclass.label.autoangle = mapscript.MS_TRUE;
layerclass.label.autofollow = mapscript.MS_TRUE;

Resulting mapfile:

LABEL
        SIZE SMALL
        TYPE BITMAP
        BUFFER 0
        COLOR 0 0 0
        FORCE TRUE
        MINDISTANCE -1
        MINFEATURESIZE -1
        OFFSET 0 0
        PARTIALS TRUE
        POSITION UC
      END

Resulting Error:

Attempted to read or write protected memory. This is often an indication that ot
her memory is corrupt.
(something with P/Invoke)



Is this a bug, or is it just nog possible to get autofollow labels with bitmap type labels? Or is it Csharp errors with bitmap font?


Greetings

Gerben Tiemens



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