【转帖】create bmpjpg file reference
 

create bmp/jpg file reference
create bmp/jpg file reference
we use dwgdirect to convert from visio in dxf/dwg.
for each bitmap the following data are available:
file path/name, rectangle where to put .
i try to use example code from odwriteex; now i am able to place the bitmap.
but how to get the right scaling data? the example code uses a known bitmap size; in our environment its unknown. accessing imagesize() and resolutionmmperpixel() returns no valid values( always 1.0,1.0).
whats the recommended way to get a (file based) picture into the given area?
actually in dwg(dxf) file not the world image size is stored but uv vectors for single pixel. so if you want to specify world space occupied by image its pixel size is required.
the "standard" way is to implement rasterservices to make them able read and exract resolution from image file. (in different client applications different raster libraries can be used to load jpeg, tiff etc.)
in such case dd will take care about loading the file via raster services and performing necessary actions.
method used in odwriteex sample where image dimensions are specified explicitly is an illustation how to avoid image file loading if in your application you already know the size of image.
sergey slezkin