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(PECL imagick 2.0.0)
ImagickDraw::circle — Draws a circle
Diese Funktion ist bis jetzt nicht dokumentiert. Es steht nur die Liste der Argumente zur Verfügung.
Draws a circle on the image.
origin x coordinate
origin y coordinate
perimeter x coordinate
perimeter y coordinate
Es wird kein Wert zurückgegeben.
<?php
// OR we could just draw a simple circle for the benefit of the newbies.
// I'm not great at OOP programming and I hope my comments are accurate.
// commets or criticism are welcome.
$image = new Imagick(); // Create a new instance an $image class
$width = 600; // Some necessary dimensions
$height = 400;
// $image class now inherits some attributes. i.e. Dimensions, bkgcolor...
$image->newImage( $width, $height, new ImagickPixel( 'lightgray' ) );
$draw = new ImagickDraw(); //Create a new drawing class (?)
$draw->setFillColor('wheat'); // Set up some colors to use for fill and outline
$draw->setStrokeColor( new ImagickPixel( 'green' ) );
$draw->circle( $width/2, $height/2, $width/2, $width/2 ); // Draw the circle already
$image->drawImage( $draw ); // Apply the stuff from the draw class to the image canvas
$image->setImageFormat('jpg'); // Give the image a format
header('Content-type: image/jpeg'); // Prepare the web browser to display an image
echo $image; // Publish it to the world!
//$image->writeImage('someimage.jpg"); // ...Or just write it to a file...
?>
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
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