protected function _getStop(Image_3D_Color $color, $offset = 0, $alpha = null)
{
$values = $color->getValues();
$values[0] = (int) round($values[0] * 255);
$values[1] = (int) round($values[1] * 255);
$values[2] = (int) round($values[2] * 255);
if ($alpha === null) {
$values[3] = 1 - $values[3];
} else {
$values[3] = 1 - $alpha;
}
return sprintf("\t\t\t<stop id=\"stop%d\" offset=\"%.1f\" style=\"stop-color: rgb(%d, %d, %d); stop-opacity: %.4f;\" />\n", $this->_id++, $offset, $values[0], $values[1], $values[2], $values[3]);
}
protected function _getColor(Image_3D_Color $color)
{
$values = $color->getValues();
$values[0] = (int) round($values[0] * 255);
$values[1] = (int) round($values[1] * 255);
$values[2] = (int) round($values[2] * 255);
$values[3] = (int) round($values[3] * 127);
$color = '';
if ($values[3] > 0) {
$color = 'rgba(' . implode(',', $values) . ')';
} else {
unset($values[3]);
$color = 'rgb(' . implode(',', $values) . ')';
}
return $color;
}
protected function _getColor(Image_3D_Color $color, $alpha = 1.0)
{
$values = $color->getValues();
$values[0] = (int) round($values[0] * 255);
$values[1] = (int) round($values[1] * 255);
$values[2] = (int) round($values[2] * 255);
$values[3] = (int) round((1 - (1 - $values[3]) * $alpha) * 127);
if ($values[3] > 0) {
// Tranzparente Farbe allokieren
$color = imageColorExactAlpha($this->_image, $values[0], $values[1], $values[2], $values[3]);
if ($color === -1) {
// Wenn nicht Farbe neu alloziieren
$color = imageColorAllocateAlpha($this->_image, $values[0], $values[1], $values[2], $values[3]);
}
} else {
// Deckende Farbe allozieren
$color = imageColorExact($this->_image, $values[0], $values[1], $values[2]);
if ($color === -1) {
// Wenn nicht Farbe neu alloziieren
$color = imageColorAllocate($this->_image, $values[0], $values[1], $values[2]);
}
}
return $color;
}
protected function _getColor(Image_3D_Color $color, $alpha = 1.0)
{
$values = $color->getValues();
return array($values[0], $values[1], $values[2], (1 - $values[3]) * $alpha);
}
/**
* Render the image
*
* Render the image into the metioned file
*
* @param string $file Filename
*
* @return void
*/
public function render($file)
{
// Render image...
$canvas = $this->_raytrace();
// Write canvas to file
$this->_image = imagecreatetruecolor($this->_size[0] * 2, $this->_size[1] * 2);
$bg = $this->_getColor($this->_background);
imagefill($this->_image, 1, 1, $bg);
$x = 0;
foreach ($canvas as $row) {
$y = 0;
foreach ($row as $pixel) {
if (count($pixel)) {
$color = new Image_3D_Color();
$color->merge($pixel);
imagesetpixel($this->_image, $x, $y, $this->_getColor($color));
}
++$y;
}
++$x;
}
imagepng($this->_image, $file);
}
protected function _getColor(Image_3D_Color $color)
{
$values = $color->getValues();
return sprintf('#%02x%02x%02x@%f', (int) ($values[0] * 255), (int) ($values[1] * 255), (int) ($values[2] * 255), 1 - $values[3]);
}
/**
* Create an appropriate array representation from a Image_3D_Color object
*
* @param Image_3D_Color $color Color to transform to rgba syntax
* @param float $alpha optional Override the alpha value set in the Image_3D_Color object
*
* @return array Array of color values reflecting the different color
* components of the input object
*/
protected function _getRgba(Image_3D_Color $color, $alpha = null)
{
$values = $color->getValues();
$values[0] = (int) round($values[0] * 255);
$values[1] = (int) round($values[1] * 255);
$values[2] = (int) round($values[2] * 255);
if ($alpha !== null) {
$values[3] = 1.0 - $alpha;
} else {
$values[3] = 1.0 - $values[3];
}
return array('r' => $values[0], 'g' => $values[1], 'b' => $values[2], 'a' => $values[3]);
}
