我们的开发服务器最近升级到了PHPV5.2.13。通过这次升级,我们发现我们的png图像存在字距(字母间距)问题。我们已经尝试了许多字体,但还没有找到解决方案。
我们使用GD库创建图像,并使用字体文件和imagettftext()或imagefttext()函数将文本写入图像。
有没有其他人遇到过这种情况?我是不是误解了什么,还是应该把它作为bug提交给PHP?有没有什么我还没想到的很酷的变通方法呢?
这里有一个新的和旧的tahoma粗体的例子。其他字体(粗体和非粗体)也有同样的问题。有些字母和数字看起来像是偏离了中心或类似的东西。
坏-新PHP
Good - old PHP v5.2.11 (单词略有不同,因为这是我们的开发服务器,另一个是实时服务器)
发布于 2010-04-10 03:43:25
“跟踪”是一个类似的术语,表示文本设置的紧凑程度或松散程度。你可能会更幸运地用谷歌搜索一下,比如this result。
发布于 2016-08-31 17:07:06
由于我们使用的字体,字距调整对我们不起作用,所以我们不得不为特定的字母组合,如AV,AW ...etc,手动添加字距调整。
/**
* This function lets you write a string with your own letter spacing ($t)
* and kern specific letter combinations like AV
*
* @param type $im An image resource, returned by one of the image creation functions
* @param type $size The font size. Depending on your version of GD, this should be specified as the pixel size (GD1) or point size (GD2).
* @param type $angle The angle in degrees, with 0 degrees being left-to-right reading text. Higher values represent a counter-clockwise rotation. For example, a value of 90 would result in bottom-to-top reading text.
* @param type $t Letter Spacing
* @param type $k Kerning Spacing
* @param type $x The coordinates given by x and y will define the basepoint of the first character (roughly the lower-left corner of the character). This is different from the imagestring(), where x and y define the upper-left corner of the first character. For example, "top left" is 0, 0.
* @param type $y The y-ordinate. This sets the position of the fonts baseline, not the very bottom of the character.
* @param type $color The color index. Using the negative of a color index has the effect of turning off antialiasing. See imagecolorallocate().
* @param type $font The path to the TrueType font you wish to use.
* @param type $text Text to write/print to the image
*/
function ImageTTFTextWithSpacing($im, $size, $angle, $t, $k, $x, $y, $color, $font, $text) {
$numchar = strlen($text);
for($i = 0; $i < $numchar; $i++) {
# Assign character
$char[$i] = substr($text, $i, 1);
//Top is wider than bottom of character
$up = ['Y','V','W'];
//Bottom is wider than top of character
$down = ['A'];
//From the second letter on
if( $i > 0 &&
//check whether we have TOP and BOTTOM type character
//next to each other so we need to adjust spacing
((in_array($char[$i], $up) && in_array($char[$i-1], $down)) ||
(in_array($char[$i-1], $up) && in_array($char[$i], $down)) )) {
$w -= $k;
}
# Write character
imagettftext($im, $size, $angle, ($x + $w + ($i * $t)), $y, $color, $font, $char[$i]);
# Get width of character
$width = imagettfbbox($size, $angle, $font, $char[$i]);
$w = $w + $width[2];
}
}
https://stackoverflow.com/questions/2610019
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