PHP GD imagefill - 填充到源的左侧

Question

I am extending an image canvas with PHP gd:

    $newimage = imagecreatetruecolor($imageWidth + 840, $imageHeight);
    $color = imagecolorallocate($newimage, 0, 0, 0);
    imagefill($newimage, 0, 0, $color);
    imagecopy($newimage, $image, 0, 0, 0, 0, $imageWidth, $imageHeight);

    //get extension of the cropped image
    $ext = end(explode('.' , $imageName));

    //timestamp it
    $timestamp = time();

    //rename the new image
    $fileName = rand() . $timestamp . '.' . $ext;

    //unlink old image
    unlink($src);

    //update the DB with new imagename
    $update = array('update' => $this->image->update($imageID, $fileName));

    //Set the path for the image
    $path = 'data/gallery/' . $galleryID . '/images/album/' . $fileName;

    //create the cropped image
    imagejpeg($newimage,$path,$jpeg_quality);

This works as expected, the canvas is extended to the right 840 pixels. What I would like to be able to do is extend the canvas to the left 840 pixels. Not sure how to make this happen.

Thanks for the help.

Answer 1

Actually pretty simple once I deciphered all the parameters.

imagecopy ( resource dest_image, resource source_image, int dest_x, int dest_y, int source_x, int source_y, int source_width, int source_height)

• The destination image you're copying to

• The source image you're copying from

• The X co-ordinate you want to copy to

• The Y co-ordinate you want to copy to

• The X co-ordinate you want to copy from

• The y co-ordinate you want to copy from

• The width in pixels of the source image you want to copy

• The height in pixels of the source image you want to copy