Re: Calculate string width using some font.

Juan Felipe Alvarez Saldarriaga wrote: > Hey list! :) my name's not list but what the heck: take a look at these function, they should light the way: http://php.net/manual/en/function.imageftbbox.php http://php.net/manual/en/function.imagepsbbox.php http://php.net/manual/en/function.imagettfbbox.php http://php.net/imageloadfont everything is pixels. there is no dpi - your screen & printer has a certain dpi and that determine how big the image displays on either. okay not much help - I had brain freeze half thru. > > I've got a problem trying to calculate a string width using an X font > with some Y font size to use in an svg-to-pdf conversion. > > This is what I try to do: > 1. Create a dummy image. > 2. Set the text there using font X and the font size Y (it seems that > when I create the image it renders it at 72dpi so I need to reduce it at > 300dpi) > > I'm not sure what the imagettftext() function returns, are those values > measured in pixels ? yes. > I read in some page that the proportion to reduce > the image at 300dpi is reduce the size to 24% of its original size. > > http://www.printingforless.com/resolution.html > > That's the code: > > *** > > // Create dummy image. > $rsc_image = imagecreate( 1, 1 ); > > // Set image. > $arr_ftx = imagettftext( $rsc_image, $int_font_size, 0, 0, 0, -1, > "./fonts/{$str_font_file}", $str_variable_value ); > // Destroy dummy image. > imagedestroy( $rsc_image ); > > // Set structure of widths. > // TODO: Magik numbers. > $arr_variable_pixels[$str_variable_index] = ( ( $arr_ftx[2] * 24 ) / 100 ); > > *** > > Thx for any help. >