<?php
$r = 150; # radius of first circle
$w = 245; # image width
$h = 365; # image height
$x = $w/2+40; # width offset
$y = $h/2+90; # height offset
$alpha = .03; # transparency of rainbow
$image = new imagick( "needleclimbing.jpg" );
# define some color objects
$none = new imagickpixel( "transparent" );
$purple = new imagickpixel( "purple" );
$red = new imagickpixel( "red" );
$orange = new imagickpixel( "orange" );
$yellow = new imagickpixel( "yellow" );
$green = new imagickpixel( "green" );
$blue = new imagickpixel( "blue" );
$violet = new imagickpixel( "violet" );
## Purple circle
$circle_purple = new ImagickDraw;
$circle_purple->setfillcolor($none);
$circle_purple->setstrokecolor($purple);
$circle_purple->setstrokewidth(6);
$circle_purple->setFillOpacity(.3);
$circle_purple->setStrokeAlpha($alpha);
$circle_purple->circle( $x, $y, $x+$r, $y+$r);
$image->drawimage($circle_purple);
$r = $r+4; # increase radius
$circle_red = $circle_purple->clone(); # clone color object
$circle_red->setstrokecolor($red); # change color
$circle_red->setStrokeAlpha($alpha);
$circle_red->circle( $x, $y, $x+$r, $y+$r);
$image->drawimage($circle_red);
$r = $r+4; # increase radius
$circle_orange = $circle_red->clone(); # clone color object
$circle_orange->setstrokecolor($orange); # change color
$circle_orange->setStrokeAlpha($alpha);
$circle_orange->circle( $x, $y, $x+$r, $y+$r);
$image->drawimage($circle_orange);
$r = $r+4; # increase radius
$circle_yellow = $circle_orange->clone();
$circle_yellow->setstrokecolor($yellow);
$circle_yellow->setStrokeAlpha($alpha);
$circle_yellow->circle( $x, $y, $x+$r, $y+$r);
$image->drawimage($circle_yellow);
$r = $r+4; # increase radius
$alpha = $alpha*1.5; # decrease transparency
$circle_green = $circle_yellow->clone();
$circle_green->setstrokecolor($green);
$circle_green->setStrokeAlpha($alpha);
$circle_green->circle( $x, $y, $x+$r, $y+$r);
$image->drawimage($circle_green);
$r = $r+4; # increase radius
$alpha = $alpha*1.5; # decrease transparency
$circle_blue = $circle_green->clone();
$circle_blue->setstrokecolor($blue);
$circle_blue->setStrokeAlpha($alpha);
$circle_blue->circle( $x, $y, $x+$r, $y+$r);
$image->drawimage($circle_blue);
$r = $r+4; # increase radius
$alpha = $alpha*1.5; # decrease transparency
$circle_violet = $circle_blue->clone();
$circle_violet->setstrokecolor($violet);
$circle_violet->setStrokeAlpha($alpha);
$circle_blue->circle( $x, $y, $x+$r, $y+$r);
$image->drawimage($circle_violet);
header( "Content-Type: image/jpeg" );
echo $image;
?>
