How to align text based on its box size using PHP Imagick? -


i'm puting texts in image @ specifics positions x , y. trying align text in box on photoshop, when use $draw->settextalignment() got different result. see bellow:

current result:

current alignment

desired result:

desired alignment

the text , properties (font name, size, color, etc) dynamic, size can vary.

can me that?

code:

<?php  $draw = new \imagickdraw(); $draw->setstrokecolor(new \imagickpixel('black')); $draw->setfillcolor(new \imagickpixel('red')); $draw->setstrokewidth(1); $draw->setfontsize(36);  // first box $draw->settextalignment(\imagick::align_left); $draw->annotation(250, 75, "first line\nsecond line");  // second box $draw->settextalignment(\imagick::align_center); $draw->annotation(250, 210, "first line\nsecond line");  // third box $draw->settextalignment(\imagick::align_right); $draw->annotation(250, 330, "first line\nsecond line");  $draw->line(250, 0, 250, 500);  $image = new \imagick(); $image->newimage(500, 500, new \imagickpixel('transparent')); $image->setimageformat("png"); $image->drawimage($draw);  header("content-type: image/png"); echo $image->getimageblob();

p.s. vertical lines used on these examples show alignment differences.

i found solution! see result image , explanation:

see text boxes aligned

we can query $draw object using imagick::queryfontmetrics in order know text width , height - returns other information's not needed purpose, see:

array returned imagick::queryfontmetrics

the x coordinate first argument of imagickdraw::annotation , specifies text should drawn on horizontal axis of image.

with width of text in our hands (textwidth) can can calculate correct x coordinate of text doing following each text alignment:

  • left - use x coordinate - nothing do.
  • center - sum x coordinate + half width of text.
  • right - sum x coordinate + entire width of text.

see code in action:

<?php $image = new \imagick();  $draw = new \imagickdraw(); $draw->setstrokecolor(new \imagickpixel('black')); $draw->setfillcolor(new \imagickpixel('red')); $draw->setstrokewidth(1); $draw->setfontsize(36); $text = "first line\nsecond line";  // first box $draw->settextalignment(\imagick::align_left); $draw->annotation(250, 75, $text);  // second box $draw->settextalignment(\imagick::align_center); $metrics = $image->queryfontmetrics($draw, $text); $draw->annotation(250 + ($metrics['textwidth'] / 2), 210, $text);   // third box $draw->settextalignment(\imagick::align_right); $metrics = $image->queryfontmetrics($draw, $text); $draw->annotation(250 + ($metrics['textwidth']), 330, $text);  $draw->line(250, 0, 250, 500);  $image->newimage(500, 500, new \imagickpixel('transparent')); $image->setimageformat("png"); $image->drawimage($draw);  header("content-type: image/png"); echo $image->getimageblob();

it outputs image texts aligned.

for more info see following references:


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