/**
* Transform the Coordinate
*
* Use a transformationmatrix to transform (move) the point
*
* @param Image_3D_Matrix $matrix Transformationmatrix
* @param string $id Transformationid
*
* @return void
*/
public function transform(Image_3D_Matrix $matrix, $id = null)
{
// Point already transformed?
if ($id !== null && $this->_lastTransformation === $id) {
return false;
}
$this->_lastTransformation = $id;
$point = clone $this;
$this->_x = $point->getX() * $matrix->getValue(0, 0) + $point->getY() * $matrix->getValue(1, 0) + $point->getZ() * $matrix->getValue(2, 0) + $matrix->getValue(3, 0);
$this->_y = $point->getX() * $matrix->getValue(0, 1) + $point->getY() * $matrix->getValue(1, 1) + $point->getZ() * $matrix->getValue(2, 1) + $matrix->getValue(3, 1);
$this->_z = $point->getX() * $matrix->getValue(0, 2) + $point->getY() * $matrix->getValue(1, 2) + $point->getZ() * $matrix->getValue(2, 2) + $matrix->getValue(3, 2);
$this->_screenCoordinates = null;
}
public function multiply(Image_3D_Matrix $matrix)
{
$new = clone $this;
for ($i = 0; $i < 4; $i++) {
for ($j = 0; $j < 4; $j++) {
$sum = 0;
for ($k = 0; $k < 4; $k++) {
$sum += $new->getValue($i, $k) * $matrix->getValue($k, $j);
}
$this->setValue($i, $j, $sum);
}
}
return $this;
}
