ImagickDraw::annotation

(PECL imagick 2, PECL imagick 3)

ImagickDraw::annotation — Draws text on the image

说明

public ImagickDraw::annotation(float $x, float $y, string $text): bool

警告

本函数还未编写文档，仅有参数列表。

Draws text on the image.

参数

x: The x coordinate where text is drawn
y: The y coordinate where text is drawn
text: The text to draw on the image

返回值

没有返回值。

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use_contact_form at Jonas-Kress dot de ¶

15 years ago

may help someone...



<?php

    /**

     * Split the given text into rows fitting the given maxWidth

     *

     * @param unknown_type $draw

     * @param unknown_type $text

     * @param unknown_type $maxWidth

     * @return array

     */

    private function getTextRows($draw, $text, $maxWidth)

    {        

        $words = explode(" ", $text);

        

        $lines = array();

        $i=0;

        while ($i < count($words)) 

        {//as long as there are words



            $line = "";

            do

            {//append words to line until the fit in size

                if($line != ""){

                    $line .= " ";

                }

                $line .= $words[$i];

                

                

                $i++;

                if(($i) == count($words)){

                    break;//last word -> break

                }

                

                //messure size of line + next word

                $linePreview = $line." ".$words[$i];

                $metrics = $this->canvas->queryFontMetrics($draw, $linePreview);

                //echo $line."($i)".$metrics["textWidth"].":".$maxWidth."<br>";

                

            }while($metrics["textWidth"] <= $maxWidth);

            

            //echo "<hr>".$line."<br>";

            $lines[] = $line;

        }

        

        //var_export($lines);

        return $lines;

    }

?>

down

Anonymous ¶

15 years ago

Here's how to create a header image and write it to file.  This took me a while to figure out.  I hope this helps.

<?php

/* Text to write */
$text = "Hello World!";

/* Create Imagick objects */
$image = new Imagick();
$draw = new ImagickDraw();
$color = new ImagickPixel('#000000');
$background = new ImagickPixel('none'); // Transparent

/* Font properties */
$draw->setFont('Arial');
$draw->setFontSize(50);
$draw->setFillColor($color);
$draw->setStrokeAntialias(true);
$draw->setTextAntialias(true);

/* Get font metrics */
$metrics = $image->queryFontMetrics($draw, $text);

/* Create text */
$draw->annotation(0, $metrics['ascender'], $text);

/* Create image */
$image->newImage($metrics['textWidth'], $metrics['textHeight'], $background);
$image->setImageFormat('png');
$image->drawImage($draw);

/* Save image */
file_put_contents('/path/to/file.png', $image);
?>

down

daniel at justathought dot net ¶

6 months ago

[As mentioned in another comment] To correctly position text in the vertical plane when using `annotation()`, you can use the value of the `"ascender"` element returned by `Imagick::queryFontMetrics()`.

So, to effectively make your text touch [0, 0], for example, you could do something like the following.

<?php
$textDraw = new ImagickDraw();
$textDraw->setFont($fontPathname);
$textDraw->setFontSize($fontSize);
$textDraw->setFillColor(new ImagickPixel($color));

$imagick= new Imagick();
$textMetrics = $imagick->queryFontMetrics($textDraw, 'Hello, World!');

$textDraw->annotation(
    0,
    $textMetrics['ascender'],  // <-- This is the important bit :-)
    'Hello, World!'
);
?>

Hope that helps clarify.  The other comment was a blessing for me.

down

-1

Anonymous ¶

15 years ago

You can use this method to break your text so that it'll fit a certain $maxWidth.



<?php

/**

 * @param string $text

 * @param int $maxWidth

 */

protected function _fitText($text, $maxWidth)

{

    $im = new Imagick();

    $im->newImage($this->_width, $this->_height, "none");



    $lines = explode(PHP_EOL, trim($text));

    $DEBUG_LOOP = 0;



    for ($k = 0; $k < count($lines); ++$k) {

        do {

            $drawText = new ImagickDraw();

            // set your font settings like size, family, .. here

            $metrics  = $im->queryFontMetrics($drawText, $lines[$k]);

            $fits     = $metrics["textWidth"] <= $maxWidth;



            if ($fits) {

                break;

            }



            $pos = mb_strrpos($lines[$k], " ");

            if ($pos === false) {

                throw new RuntimeException("can not make it fit");

            }

            if (!isset($lines[$k + 1])) {

                $lines[$k + 1] = null;

            }

            $lines[$k + 1] = trim(mb_substr($lines[$k], $pos + 1) . " " . $lines[$k + 1]);

            $lines[$k]     = trim(mb_substr($lines[$k], 0, $pos));



            if (++$DEBUG_LOOP >= 200) {

                throw new RuntimeException("infinite loop");

            }

        } while (!$fits);

    }

    $text     = implode(PHP_EOL, $lines);

    $drawText = new ImagickDraw();

    // set your font settings like size, family, .. here again!

    $metrics  = $im->queryFontMetrics($drawText, $text);

    $metrics["text"] = $text;

    assert('$metrics["textWidth"] <= $maxWidth');

    return $metrics;

}

?>

down

-1

web at synaptech dot fr ¶

11 years ago

In some cases the (custom) font can be truncated on the side parts, especially the handwritten ones.
To improve the above note from Anonymous on "how to create a header image", I've changed this part of the code:

<?php
/* Create text */
$draw->annotation( $metrics['boundingBox']['y2'], $metrics['ascender'], $text );

/* Create image */
$image->newImage( $metrics['textWidth'] + $metrics['boundingBox']['y2'], $metrics['textHeight'], $background );
?>