ImagickDraw::circle

(PECL imagick 2.0.0)

ImagickDraw::circle — Dessine un cercle

Description

bool ImagickDraw::circle ( float $ox , float $oy , float $px , float $py )

Avertissement

Cette fonction n'est pas documentée et seule la liste des arguments est disponible.

Dessine un cercle.

Liste de paramètres

ox: abscisse de l'origine
oy: ordonnée de l'origine
px: abscisse du périmètre
py: ordonnée du périmètre

Valeurs de retour

Aucune valeur n'est retournée.

add a note User Contributed Notes ImagickDraw::circle

garym at binaryfarm dot com 24-Feb-2010 11:34


<?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...



?>

christian dot reinecke at web dot de 23-Jun-2009 06:31


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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