Dynamic Font Size

[luiddog]

I have a page which turns text into a PNG. It can do it with a number of different fonts. The problem I'm having is the font size needs to change depending of the font and the legnth of text.

I need to find a way for the for the font size to change depending on the font and text length.

I think

$NewSize = imagettfbbox($size, 0, $font, $text) 

is the solution but I don't no how. I need to be able to input in a number of variables for $size and find which $NewSize[2] is closest with out going over 400px (the size of the PNG).

Any Ideas? Or is there a better way?

[proxydude]

cheat,
open up photoshop or something and type the amount of characters to fit your image at say 12pt,

then count the amount of characters

then in your php script do something like

// say your string has a max of 10 characters at 12pt to fit the image

$string = "will this text fit in my image";

if(strlen($string)>10){
$new-font-size = 10 / strlen($string); // result = 0.333333 round it using round() = 0.33
$new-font-size = round($new-font-size) * 12;
// write your text to the image using the new-font-size

}
else {
// do as normal using 12pt
}

ok it isn't perfect but you could always make a temporary image using your text and then reize it to overlay on your background image, not sure how badly distored the text will be

but the above exmaple adding some more checking and math etc, would be the function that your looking for, and i dont think it exists

*** waiting to be corrected 😉

[luiddog]

Nice idea but it won't work for my application. I have users inputting variable lengths of text and using different fonts. I need a way that it will always be the largest it can be with still fitting.

[luiddog]

Ended up doing this. Any ideas on how to make this better?

$s = imagettfbbox(50,0,$font,$text);
if ($s[2] < 399) {
$fontfind .= '50|';
}
$s1 = imagettfbbox(45,0,$font,$text);
if ($s1[2] < 399) {
$fontfind .= '45|';
}
$s2 = imagettfbbox(40,0,$font,$text);
if ($s2[2] < 399) {
$fontfind .= '40|';
}
$s3 = imagettfbbox(35,0,$font,$text);
if ($s3[2] < 399) {
$fontfind .= '35|';
}
$s4 = imagettfbbox(30,0,$font,$text);
if ($s4[2] < 399) {
$fontfind .= '30|';
}
$s5 = imagettfbbox(25,0,$font,$text);
if ($s5[2] < 399) {
$fontfind .= '25|';
}
$s6 = imagettfbbox(20,0,$font,$text);
if ($s6[2] < 399) {
$fontfind .= '20|';
}
$s7 = imagettfbbox(15,0,$font,$text);
if ($s7[2] < 399) {
$fontfind .= '15|';
}
$s8 = imagettfbbox(10,0,$font,$text);
if ($s8[2] < 399) {
$fontfind .= '10|';
}
$s9 = imagettfbbox(5,0,$font,$text);
if ($s9[2] < 399) {
$fontfind .= '5|';
}
$fontfound = explode("|",$fontfind);
$fontsz = $fontfound[0];

[Weedpacket]

Well, the rule of thumb is if you find yourself writing the same code over and over again you're doing something wrong.

You could put the sizes in an array, and then use a loop to go through them. Oh, and start small and work up to larger sizes. If you find a size that's too large, then obviously larger sizes will be too large as well.

$sizes = array(15, 20, 25, ...);
$fontfind="";
foreach($sizes as $size)
{
    $bbox = imagettfbbox($size, 0, $font, $text);
    if($bbox[2]>399) break;
    $fontfind = $size.'|'.$fontfind;
}
echo $fontfind;