|
|
|
|
Bookmark this on Delicious
Share on Facebook
 Slashdot It!
Digg  imagefontwidth
Get font width
(PHP 4, PHP 5)
Related Examples ( Source code ) » imagefontwidth Examples ( Source code ) » Set font Code Examples / Notes » imagefontwidthdev
This library function is very useful for variable-sized images that only contain text, like this function that I use to output error messages that accumulate and cause a fatal error in my thumbnailer: <?php function errimg($error) { // $error is an array of error messages, each taking up one line // initialization $font_size = 2; $text_width = imagefontwidth($font_size); $text_height = imagefontheight($font_size); $width = 0; // the height of the image will be the number of items in $error $height = count($error); // this gets the length of the longest string, in characters to determine // the width of the output image for($x = 0; $x < count($error); $x++) { if(strlen($error[$x]) > $width) { $width = strlen($error[$x]); } } // next we turn the height and width into pixel values $width = $width * $text_width; $height = $height * $text_height; // create image with dimensions to fit text, plus two extra rows and // two extra columns for border $im = imagecreatetruecolor($width + ( 2 * $text_width ), $height + ( 2 * $text_height ) ); if($im) { // image creation success $text_color = imagecolorallocate($im, 233, 14, 91); // this loop outputs the error message to the image for($x = 0; $x < count($error); $x++) { // imagestring(image, font, x, y, msg, color); imagestring($im, $font_size, $text_width, $text_height + $x * $text_height, $error[$x], $text_color); } // now, render your image using your favorite image* function // (imagejpeg, for instance) out($im, array(), $error); } else { // image creation failed, so just dump the array along with extra error $error[] = "Is GD Installed?"; die(var_dump($error)); } } ?> The function expects an array of error messages to be passed in, and then outputs an image containing the contents of the array. This is especially useful if your code is contained in an html page that will display rexes if the images do not render correctly. This function displays the array in image form with index 0 at the top, and the highest index at the bottom. You have to write out() yourself though, see imagejpeg, imagepng, etc for good ideas on how to write a decent output function. puremango dot co dot uk
a function that is faster than ImageFontWidth for certain uses: <? function ImageFontWidthByFilename($filename) { $handle = @fopen($font_locations[$i],"r"); $c_wid = @fread($handle,11); @fclose($handle); return(ord($c_wid{8})+ord($c_wid{9})+ord($c_wid{10})+ord($c_wid{11})); } echo "./font.gdf is ".ImageFontWidthByFilename("./font.gdf")." pixels wide"; ?> reading the widths of 5 different fonts, 500 times, ImageFontWidth took an average of ~0.004 seconds per 5 reads, my function takes ~0.0003 per 5. The reason is that ImageFontWidth requires a call to ImageLoadFont, but if for some reason you won't need to load the font, just find out the width, this is the function for you :-) more such wonders at http://puremango.co.uk |
Change Language
gd_info getimagesize image_type_to_extension image_type_to_mime_type image2wbmp imagealphablending imageantialias imagearc imagechar imagecharup imagecolorallocate imagecolorallocatealpha imagecolorat imagecolorclosest imagecolorclosestalpha imagecolorclosesthwb imagecolordeallocate imagecolorexact imagecolorexactalpha imagecolormatch imagecolorresolve imagecolorresolvealpha imagecolorset imagecolorsforindex imagecolorstotal imagecolortransparent imageconvolution imagecopy imagecopymerge imagecopymergegray imagecopyresampled imagecopyresized imagecreate imagecreatefromgd2 imagecreatefromgd2part imagecreatefromgd imagecreatefromgif imagecreatefromjpeg imagecreatefrompng imagecreatefromstring imagecreatefromwbmp imagecreatefromxbm imagecreatefromxpm imagecreatetruecolor imagedashedline imagedestroy imageellipse imagefill imagefilledarc imagefilledellipse imagefilledpolygon imagefilledrectangle imagefilltoborder imagefilter imagefontheight imagefontwidth imageftbbox imagefttext imagegammacorrect imagegd2 imagegd imagegif imagegrabscreen imagegrabwindow imageinterlace imageistruecolor imagejpeg imagelayereffect imageline imageloadfont imagepalettecopy imagepng imagepolygon imagepsbbox imagepsencodefont imagepsextendfont imagepsfreefont imagepsloadfont imagepsslantfont imagepstext imagerectangle imagerotate imagesavealpha imagesetbrush imagesetpixel imagesetstyle imagesetthickness imagesettile imagestring imagestringup imagesx imagesy imagetruecolortopalette imagettfbbox imagettftext imagetypes imagewbmp imagexbm iptcembed iptcparse jpeg2wbmp png2wbmp |
