php绘图文字分行函数
时间: 2023-08-15 09:04:51 浏览: 53
以下是一个简单的 PHP 函数,用于在图像上绘制分行文本:
```php
function draw_text($image, $font, $size, $x, $y, $text, $max_width) {
$words = explode(' ', $text);
$lines = array('');
$line_widths = array(0);
foreach ($words as $word) {
$line_width = $line_widths[count($line_widths)-1] + imagettfbbox($size, 0, $font, $word)[2] - imagettfbbox($size, 0, $font, $word)[0];
if ($line_width > $max_width) {
array_push($lines, $word);
array_push($line_widths, imagettfbbox($size, 0, $font, $word)[2] - imagettfbbox($size, 0, $font, $word)[0]);
} else {
$lines[count($lines)-1] .= ' '.$word;
$line_widths[count($line_widths)-1] = $line_width;
}
}
foreach ($lines as $line) {
imagettftext($image, $size, 0, $x, $y, 0, $font, $line);
$y += $size * 1.5;
}
}
```
该函数使用 imagettfbbox() 函数来计算每个单词的宽度,并将文本拆分成多个行,以适应指定的最大宽度。然后,使用 imagettftext() 函数将每个行绘制到指定的图像上。
使用示例:
```php
$im = imagecreate(500, 500);
$black = imagecolorallocate($im, 0, 0, 0);
$font = 'arial.ttf';
$size = 20;
$x = 50;
$y = 50;
$text = 'This is a long text that needs to be split into multiple lines';
$max_width = 200;
draw_text($im, $font, $size, $x, $y, $text, $max_width);
header('Content-Type: image/png');
imagepng($im);
imagedestroy($im);
```