public function interpolation(string $method = 'bilinear_fixed') : InternalGD
{
imagesetinterpolation($this->canvas, Converter::toConstant($method, 'IMG_'));
return $this;
}
private function alpha()
{
imagesetinterpolation($this->resource(), IMG_BILINEAR_FIXED);
imagealphablending($this->resource, false);
imagesavealpha($this->resource, true);
}
static function resize($sourcePath, $newWidth = 100, $newHeight = 100)
{
// Create image resource from source path
switch (exif_imagetype($sourcePath)) {
case IMAGETYPE_JPEG:
$sourceImage = imagecreatefromjpeg($sourcePath);
break;
case IMAGETYPE_PNG:
$sourceImage = imagecreatefrompng($sourcePath);
break;
case IMAGETYPE_GIF:
$sourceImage = imagecreatefromgif($sourcePath);
break;
default:
return;
}
// Create the new image (still blank/empty)
$newImage = imagecreatetruecolor($newWidth, $newHeight);
imagesetinterpolation($newImage, IMG_SINC);
// Determine the source image Dimensions
$sourceImageWidth = imagesx($sourceImage);
$sourceImageHeight = imagesy($sourceImage);
$sourceImageAspectRatio = $sourceImageWidth / $sourceImageHeight;
$newImageAspectRatio = $newWidth / $newHeight;
// Determine parameters and copy part of the source image into the new image
if ($newImageAspectRatio >= $sourceImageAspectRatio) {
// width is the limiting factor for the source image
$src_x = 0;
$src_w = $sourceImageWidth;
$src_h = $src_w / $newImageAspectRatio;
$src_y = ($sourceImageHeight - $src_h) / 2;
} else {
// height of source image is limiting factor
$src_y = 0;
$src_h = $sourceImageHeight;
$src_w = $src_h * $newImageAspectRatio;
$src_x = ($sourceImageWidth - $src_w) / 2;
}
imagecopyresampled($newImage, $sourceImage, 0, 0, $src_x, $src_y, $newWidth, $newHeight, $src_w, $src_h);
// Save new image to destination path
switch (exif_imagetype($sourcePath)) {
case IMAGETYPE_JPEG:
imagejpeg($newImage, $sourcePath, 100);
break;
case IMAGETYPE_PNG:
imagepng($newImage, $sourcePath);
break;
case IMAGETYPE_GIF:
imagegif($newImage, $sourcePath);
break;
}
// Remove image resources to reallocate space
imagedestroy($sourceImage);
imagedestroy($newImage);
}
