public function getHotSpots()
{
$crawler = new Crawler($this);
$outlines = new CrawlerOutlineCollection();
$size = $this->image->size();
for ($x = 0; $x < $size[0]; $x++) {
for ($y = 0; $y < $size[1]; $y++) {
$pixel = $this->pixel($x, $y);
// Skip white pixels
if ($pixel->color()->compare(ImageColor::white(), 5)) {
continue;
}
// Skip crawled areas
if ($outlines->contains($pixel)) {
continue;
}
// Start crawling
$outline = $crawler->crawl($x, $y);
$outlines->push($outline);
}
}
$hotspots = new ImageCollection();
foreach ($outlines as $outline) {
$hotspots->push($this->image->sliceByOutline($outline));
}
return array($hotspots, $outlines);
}
public static function black()
{
if (self::$black === null) {
self::$black = self::fromInt(0x0);
}
return self::$black;
}
/**
* Draws a polygon
*/
protected function _polygon(array $points, $color, $filled = false)
{
if ($filled) {
imagefilledpolygon($this->gd, $points, count($points) / 2, ImageColor::parse($color));
} else {
imagepolygon($this->gd, $points, count($points) / 2, ImageColor::parse($color));
}
}
public function colorat($x, $y)
{
return ImageColor::fromInt(imagecolorat($this->img, $x, $y));
}
/**
* Looks at ahead pixel and return if it's white/outside or black
*
* @param integer $pos the position of the ahead pixel (1,2,3)
*
* @return boolean
*
*/
private function look($pos = 1)
{
$x = $this->x + $this->dir('x' . $pos);
$y = $this->y + $this->dir('y' . $pos);
$pixel = $this->matrix->pixel($x, $y);
// Position is outside the matrix
if ($pixel === null) {
return false;
}
return !$pixel->color()->compare(ImageColor::white(), 5);
// Use 5% white tolerance
}