使用 imagettftext(), PHP 右对齐图像中的文本
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Right align text in an image with imagettftext(), PHP
提问by James Simpson
I am setting up dynamic forum signature images for my users and I want to be able to put their username on the image. I am able to do this just fine, but since usernames are different lengths and I want to right align the username, how can I go about doing this when I have to set x & y coordinates.
我正在为我的用户设置动态论坛签名图像，我希望能够将他们的用户名放在图像上。我能够很好地做到这一点，但是由于用户名的长度不同并且我想正确对齐用户名，当我必须设置 x 和 y 坐标时，我该怎么做呢？
$im = imagecreatefromjpeg("/path/to/base/image.jpg");
$text = "Username";
$font = "Font.ttf";
$black = imagecolorallocate($im, 0, 0, 0);
imagettftext($im, 10, 0, 217, 15, $black, $font, $text);
imagejpeg($im, null, 90);
回答by Andy Shea
Use the imagettfbbox function to get the width of the string and then subtract that from the width of the image to get the starting x-coordinate.
使用 imagettfbbox 函数获取字符串的宽度，然后从图像的宽度中减去它以获得起始 x 坐标。
$dimensions = imagettfbbox($fontSize, $angle, $font, $text);
$textWidth = abs($dimensions[4] - $dimensions[0]);
$x = imagesx($im) - $textWidth;
回答by stil
You can use stil/gd-textclass. Disclaimer: I am the author.
您可以使用stil/gd-text类。免责声明：我是作者。
<?php
use GDText\Box;
use GDText\Color;
$im = imagecreatefromjpeg("/path/to/base/image.jpg");
$textbox = new Box($im);
$textbox->setFontSize(12);
$textbox->setFontFace("Font.ttf");
$textbox->setFontColor(new Color(0, 0, 0)); // black
$textbox->setBox(
50, // distance from left edge
50, // distance from top edge
200, // textbox width
100 // textbox height
);
// text will be aligned inside textbox to right horizontally and to top vertically
$textbox->setTextAlign('right', 'top');
$textbox->draw("Username");
You can also draw multilined text. Just use \nin the string passed to draw()method.
Example generated with this class:
您还可以绘制多行文本。只需\n在传递给draw()方法的字符串中使用。使用此类生成的示例：
回答by Pekka
Pre-calculate the size of the user's name using imagettfbbox().
使用imagettfbbox()预先计算用户名的大小。
From the width you get from there, you can then deduct the x position at which your text needs to start.
从你从那里得到的宽度，你可以减去文本需要开始的 x 位置。
回答by sujithayur
This will work...............
这将起作用.......
$s = split("[\n]+", $text);
$top=20;
$left=30;
$font_file="yourfont.ttf";
$fontsize=20;
$__H=$top;
foreach($s as $key=>$val){
$_b = imageTTFBbox($fontsize,0,$font_file,$val);
$_W = abs($_b[2]-$_b[0]);
$_X = ($left+$text_box_width)-$_W;
$_H = abs($_b[5]-$_b[3]);
$_H +=1;
$__H += $_H;
$res=imagettftext($image, $this->_fontsize, 0, $_X, $__H, $color, $font_file, $val);
$__H += 1;
回答by luky
I enhanced sujithayur code, and created function which allows all aligns (left, center, right) & (top, center, middle) and its combinations. It also uses text shadow.
我增强了 sujithayur 代码，并创建了允许所有对齐（左、中、右）和（上、中、中）及其组合的函数。它还使用文本阴影。
// $x is margin from left, in case of left align, and margin from right, in case of right horizontal align
// $alignHorizontal values can be 'left', 'center', 'right'
// $alignVertical values can be 'top', 'center', 'bottom'
function imagettftext_aligned($image, $fontSize, $x, $y, $color, $colorShadow, $fontPath, $text, $alignHorizontal, $alignVertical) {
$s = explode("\n", $text);
$imageWidth = imagesx($image);
$imageHeight = imagesy($image);
$top=$y;
$left=$imageWidth - $x;
$__H=$top; // default - top
$lineHeight = $fontSize + 14;
if ($alignVertical == 'bottom')
$__H = $imageHeight - $y - (count($s) * $lineHeight);
elseif ($alignVertical == 'center')
$__H = $imageHeight/2 - (count($s) * $lineHeight)/2;
foreach($s as $key=>$val){
$_b = imageTTFBbox($fontSize,0,$fontPath,$val);
$_W = abs($_b[2]-$_b[0]);
$_H = abs($_b[5]-$_b[3]);
$_H +=1;
if ($alignHorizontal == 'right')
$_X = $left - $_W;
elseif ($alignHorizontal == 'center')
$_X = $imageWidth/2 - $_W/2;
else // default - left
$_X = $x;
imagettftextblur($image, $fontSize, 0, $_X + 2, $__H + 2, $colorShadow, $fontPath, $val, 4); // 1 can be higher to increase blurriness of the shadow
imagettftextblur($image, $fontSize, 0, $_X, $__H, $color, $fontPath, $val);
$__H += $lineHeight + 1;
}
return ['bottom' => $__H];
}
// https://github.com/andrewgjohnson/imagettftextblur
if (!function_exists('imagettftextblur'))
{
function imagettftextblur(&$image,$size,$angle,$x,$y,$color,$fontfile,$text,$blur_intensity = null)
{
$blur_intensity = !is_null($blur_intensity) && is_numeric($blur_intensity) ? (int)$blur_intensity : 0;
if ($blur_intensity > 0)
{
$text_shadow_image = imagecreatetruecolor(imagesx($image),imagesy($image));
imagefill($text_shadow_image,0,0,imagecolorallocate($text_shadow_image,0x00,0x00,0x00));
imagettftext($text_shadow_image,$size,$angle,$x,$y,imagecolorallocate($text_shadow_image,0xFF,0xFF,0xFF),$fontfile,$text);
for ($blur = 1;$blur <= $blur_intensity;$blur++)
imagefilter($text_shadow_image,IMG_FILTER_GAUSSIAN_BLUR);
for ($x_offset = 0;$x_offset < imagesx($text_shadow_image);$x_offset++)
{
for ($y_offset = 0;$y_offset < imagesy($text_shadow_image);$y_offset++)
{
$visibility = (imagecolorat($text_shadow_image,$x_offset,$y_offset) & 0xFF) / 255;
if ($visibility > 0)
imagesetpixel($image,$x_offset,$y_offset,imagecolorallocatealpha($image,($color >> 16) & 0xFF,($color >> 8) & 0xFF,$color & 0xFF,(1 - $visibility) * 127));
}
}
imagedestroy($text_shadow_image);
}
else
return imagettftext($image,$size,$angle,$x,$y,$color,$fontfile,$text);
}
}
