function applyFilter(Canvas $canvas)
{
$himage = $canvas->getImage();
// If not we need to do some enumeration
$total = imagecolorstotal($himage);
if ($total > 0) {
// This works for indexed images but not for truecolor
for ($i = 0; $i < $total; $i++) {
$index = imagecolorsforindex($himage, $i);
$rgb = rgb($index['red'], $index['green'], $index['blue']);
$hsv = hsv($rgb);
$hsv->hue = $this->hue;
$rgb = rgb($hsv);
$red = $rgb->red;
$green = $rgb->green;
$blue = $rgb->blue;
imagecolorset($himage, $i, $red, $green, $blue);
}
} else {
// For truecolor we need to enum it all
for ($x = 0; $x < imagesx($himage); $x++) {
for ($y = 0; $y < imagesy($himage); $y++) {
$index = imagecolorat($himage, $x, $y);
$rgb = rgb($index['red'], $index['green'], $index['blue'], $index['alpha']);
$hsv = hsv($rgb);
$hsv->hue = $this->hue;
$rgb = rgb($hsv);
$red = $rgb->red;
$green = $rgb->green;
$blue = $rgb->blue;
imagesetpixel($himage, $x, $y, $red << 16 | $green < 8 | $blue);
}
}
}
}
function get_colors($url)
{
// get the image name
$url = trim($url);
// create a working image
$im = imagecreatefromjpeg($url);
$height = imagesy($im);
$width = imagesx($im);
// sample five points in the image, based on rule of thirds and center
$topy = round($height / 3);
$bottomy = round($height / 3 * 2);
$leftx = round($width / 3);
$rightx = round($width / 3 * 2);
$centery = round($height / 2);
$centerx = round($width / 2);
// grab those colors
$rgb[] = imagecolorat($im, $leftx, $topy);
$rgb[] = imagecolorat($im, $rightx, $topy);
$rgb[] = imagecolorat($im, $leftx, $bottomy);
$rgb[] = imagecolorat($im, $rightx, $bottomy);
$rgb[] = imagecolorat($im, $centerx, $centery);
// process points
for ($i = 0; $i <= count($rgb) - 1; $i++) {
$r[$i] = $rgb[$i] >> 16 & 0xff;
$g[$i] = $rgb[$i] >> 8 & 0xff;
$b[$i] = $rgb[$i] & 0xff;
//rgb
list($colors[$i]['r'], $colors[$i]['g'], $colors[$i]['b']) = array($r[$i], $g[$i], $b[$i]);
//hsv
list($colors[$i]['h'], $colors[$i]['s'], $colors[$i]['v']) = hsv($r[$i], $g[$i], $b[$i]);
//hex
$colors[$i]['hex'] = rgbhex($r[$i], $g[$i], $b[$i]);
}
return $colors;
}
/**
* @brief Render the chart in 3D
*
* @return Canvas
*/
private function render3D()
{
$c = new Canvas($this->width, $this->height, rgb($this->getProperty('background', '#FFFFFF')));
$radiusx = 180;
$radiusy = 90;
$cx = $c->getWidth() / 2;
$cy = $c->getHeight() / 2;
$explode = $this->getProperty('explode', 0);
$palette = $this->getProperty('palette');
list($label, $vals) = $this->dataset->getSeries(0);
$labels = $this->dataset->getLabels();
$sum = $vals->getSum();
$ci = 0;
$sa = 0;
for ($n = 0; $n < $vals->getCount(); $n++) {
list($val, $key) = $vals->getValue($n);
$a = 360 / $sum * $val;
// Get angle
$ea = $sa + $a;
$ch = rgb($palette[$ci]);
$cs = hsv($ch);
$cs->value = $cs->value - 30;
if (arr::hasKey($labels, $n)) {
$l = $labels[$n];
} else {
$l = $n;
}
$data[] = array('key' => $key, 'label' => $l, 'c1' => $ch, 'c2' => $cs, 'sa' => $sa, 'ea' => $ea);
$sa = $ea;
$ci++;
}
$offs = array();
foreach ($data as $id => $slice) {
$avg = ($slice['sa'] + $slice['ea']) / 2;
$data[$id]['ox'] = cos(($avg - 90) % 360 * PI / 180) * $explode;
$data[$id]['oy'] = sin(($avg - 90) % 360 * PI / 180) * $explode;
$data[$id]['dx'] = cos(($avg - 180) % 360 * PI / 180);
$data[$id]['dy'] = sin(($avg - 180) % 360 * PI / 180);
}
$f = new BitmapFont(3);
$f->setTextEffect(BitmapFont::EFFECT_OUTLINE, rgb(255, 255, 255));
$p = $c->getPainter();
for ($yp = 20; $yp >= 0; $yp--) {
foreach ($data as $slice) {
$ox = $slice['ox'];
$oy = $slice['oy'];
$p->drawFilledArc($cx + $ox, $cy + $oy + $yp, $radiusx * 2, $radiusy * 2, $slice['sa'], $slice['ea'], $yp == 0 ? $slice['c1'] : $slice['c2']);
}
}
for ($yp = 20; $yp >= 0; $yp--) {
foreach ($data as $slice) {
// TODO: Labels
$m = $f->measure($slice['label']);
$dx = $slice['dx'];
$dy = $slice['dy'];
$c->drawText($f, rgb(0, 0, 0), $cx + $dx * $radiusx / 1.5 - $m['width'] / 2, $cx + $dy * $radiusy / 1.5 - $m['height'] / 2, $slice['label']);
}
}
$this->renderObjects($c);
// Return the canvas
return $c;
}
