public function _strokeBackgroundImage()
{
if ($this->background_image == '') {
return;
}
$bkgimg = Graph::LoadBkgImage('', $this->background_image);
// Background width & Heoght
$bw = imagesx($bkgimg);
$bh = imagesy($bkgimg);
// Canvas width and height
$cw = imagesx($this->img);
$ch = imagesy($this->img);
if ($this->doshadow) {
$cw -= $this->shadow_width;
$ch -= $this->shadow_width;
}
if ($this->background_image_x === null || $this->background_image_y === null) {
if ($this->background_image_center) {
// Center original image in the plot area
$x = round($cw / 2 - $bw / 2);
$y = round($ch / 2 - $bh / 2);
} else {
// Just copy the image from left corner, no resizing
$x = 0;
$y = 0;
}
} else {
$x = $this->background_image_x;
$y = $this->background_image_y;
}
imagecopymerge($this->img, $bkgimg, $x, $y, 0, 0, $bw, $bh, $this->background_image_mix);
}
