note 91688 modified in function.imagickdraw-circle by thiago
| From: | thiago@php.net | Date: | Tue, 23 Jun 2009 13:43:15 +0000 |
| Subject: | note 91688 modified in function.imagickdraw-circle by thiago | ||
| References: | 1 | Groups: | php.notes |
| Request: | Send a blank email to php-notes+get-157267@lists.php.net to get a copy of this message | ||
This example creates a circle, one part green, one part red using kind of masks for transparency,
which you might know from Photoshop. drawImage() is a quick helper for debug output (see code
comments) to help you reproduce the process.
<?php
function drawImage(Imagick $im) {
$im->setCompressionQuality(100);
$im->setImageFormat("jpg");
header("Content-Type: image/" . $im->getImageFormat());
echo $im;
exit;
}
// define red/green layer
$layer1 = new Imagick();
$layer1->newImage(100, 100, "none");
$red = new ImagickDraw();
$red->setFillColor("#FF0000");
$red->rectangle(0, 0, 50, 100);
$green = new ImagickDraw();
$green->setFillColor("#00FF00");
$green->rectangle(50, 0, 100, 100);
$layer1->drawImage($red);
$layer1->drawImage($green);
# debug output: two rectangles
# drawImage($layer1);
// define circle mask
$layer2 = new Imagick();
$layer2->newImage(100, 100, "none");
$circle = new ImagickDraw();
$circle->setFillColor("#FFFFFF");
$circle->circle(50, 50, 48, 98);
$layer2->drawImage($circle);
# debug output: the mask
# drawImage($layer2);
// use mask
$layer1->compositeImage($layer2, Imagick::COMPOSITE_DSTIN, 0, 0);
# debug output: the result of our mask usage
# drawImage($layer1);
// define background
$layer3 = new Imagick();
$layer3->newImage(100, 100, "none");
$layer3->compositeImage($layer1, Imagick::COMPOSITE_DEFAULT, 0, 0);
// define ring as background
$layer4 = new Imagick();
$layer4->newImage(100, 100, "white"); // this is our background
$ring1 = new ImagickDraw();
$ring1->setFillColor("black");
$ring1->circle(50, 50, 50, 99);
$layer4->drawImage($ring1);
# debug output: this is a black circle (not our mask, which is similar, but a little bit smaller)
# drawImage($layer4);
// use black circle as background (this creates our circle border)
$layer4->compositeImage($layer3, Imagick::COMPOSITE_DEFAULT, 0, 0);
# debug output: here we go with our circle border
# drawImage($layer4);
// draw separator between red and green rectangle (now semi circles)
$line = new ImagickDraw();
$line->setStrokeWidth(1);
$line->setStrokeColor("black");
$line->line(50, 1, 50, 99);
// add our separator line
$layer4->drawImage($line);
drawImage($layer4);
?>
To understand how the COMPOSITE_* constants effect the image merging process, see here:
http://www.imagemagick.org/Usage/compose/#duff-porter
--was--
This example creates a circle, one part green, one part red using kind of masks for transparency,
which you might know from Photoshop. drawImage() is a quick helper for debug output (see code
comments) to help you reproduce the process.
--
function drawImage(Imagick $im) {
$im->setCompressionQuality(100);
$im->setImageFormat("jpg");
header("Content-Type: image/" . $im->getImageFormat());
echo $im;
exit;
}
// define red/green layer
$layer1 = new Imagick();
$layer1->newImage(100, 100, "none");
$red = new ImagickDraw();
$red->setFillColor("#FF0000");
$red->rectangle(0, 0, 50, 100);
$green = new ImagickDraw();
$green->setFillColor("#00FF00");
$green->rectangle(50, 0, 100, 100);
$layer1->drawImage($red);
$layer1->drawImage($green);
# debug output: two rectangles
# drawImage($layer1);
// define circle mask
$layer2 = new Imagick();
$layer2->newImage(100, 100, "none");
$circle = new ImagickDraw();
$circle->setFillColor("#FFFFFF");
$circle->circle(50, 50, 48, 98);
$layer2->drawImage($circle);
# debug output: the mask
# drawImage($layer2);
// use mask
$layer1->compositeImage($layer2, Imagick::COMPOSITE_DSTIN, 0, 0);
# debug output: the result of our mask usage
# drawImage($layer1);
// define background
$layer3 = new Imagick();
$layer3->newImage(100, 100, "none");
$layer3->compositeImage($layer1, Imagick::COMPOSITE_DEFAULT, 0, 0);
// define ring as background
$layer4 = new Imagick();
$layer4->newImage(100, 100, "white"); // this is our background
$ring1 = new ImagickDraw();
$ring1->setFillColor("black");
$ring1->circle(50, 50, 50, 99);
$layer4->drawImage($ring1);
# debug output: this is a black circle (not our mask, which is similar, but a little bit smaller)
# drawImage($layer4);
// use black circle as background (this creates our circle border)
$layer4->compositeImage($layer3, Imagick::COMPOSITE_DEFAULT, 0, 0);
# debug output: here we go with our circle border
# drawImage($layer4);
// draw separator between red and green rectangle (now semi circles)
$line = new ImagickDraw();
$line->setStrokeWidth(1);
$line->setStrokeColor("black");
$line->line(50, 1, 50, 99);
// add our separator line
$layer4->drawImage($line);
drawImage($layer4);
--
To understand how the COMPOSITE_* constants effect the image merging process, see here:
http://www.imagemagick.org/Usage/compose/#duff-porter
http://php.net/manual/en/function.imagickdraw-circle.php