PHP Canvas::image方法代码示例

 /**
  * Render a background image over a rectangular area
  *
  * @param string $url      The background image to load
  * @param float  $x        The left edge of the rectangular area
  * @param float  $y        The top edge of the rectangular area
  * @param float  $width    The width of the rectangular area
  * @param float  $height   The height of the rectangular area
  * @param Style  $style    The associated Style object
  *
  * @throws Exception
  */
 protected function _background_image($url, $x, $y, $width, $height, $style)
 {
     if (!function_exists("imagecreatetruecolor")) {
         throw new Exception("The PHP GD extension is required, but is not installed.");
     }
     $sheet = $style->get_stylesheet();
     // Skip degenerate cases
     if ($width == 0 || $height == 0) {
         return;
     }
     $box_width = $width;
     $box_height = $height;
     //debugpng
     if (DEBUGPNG) {
         print '[_background_image ' . $url . ']';
     }
     list($img, $type, ) = Image_Cache::resolve_url($url, $sheet->get_protocol(), $sheet->get_host(), $sheet->get_base_path(), $this->_dompdf);
     // Bail if the image is no good
     if (Image_Cache::is_broken($img)) {
         return;
     }
     //Try to optimize away reading and composing of same background multiple times
     //Postponing read with imagecreatefrom   ...()
     //final composition parameters and name not known yet
     //Therefore read dimension directly from file, instead of creating gd object first.
     //$img_w = imagesx($src); $img_h = imagesy($src);
     list($img_w, $img_h) = dompdf_getimagesize($img);
     if (!isset($img_w) || $img_w == 0 || !isset($img_h) || $img_h == 0) {
         return;
     }
     $repeat = $style->background_repeat;
     $dpi = $this->_dompdf->get_option("dpi");
     //Increase background resolution and dependent box size according to image resolution to be placed in
     //Then image can be copied in without resize
     $bg_width = round((double) ($width * $dpi) / 72);
     $bg_height = round((double) ($height * $dpi) / 72);
     //Need %bg_x, $bg_y as background pos, where img starts, converted to pixel
     list($bg_x, $bg_y) = $style->background_position;
     if (is_percent($bg_x)) {
         // The point $bg_x % from the left edge of the image is placed
         // $bg_x % from the left edge of the background rectangle
         $p = (double) $bg_x / 100.0;
         $x1 = $p * $img_w;
         $x2 = $p * $bg_width;
         $bg_x = $x2 - $x1;
     } else {
         $bg_x = (double) ($style->length_in_pt($bg_x) * $dpi) / 72;
     }
     $bg_x = round($bg_x + $style->length_in_pt($style->border_left_width) * $dpi / 72);
     if (is_percent($bg_y)) {
         // The point $bg_y % from the left edge of the image is placed
         // $bg_y % from the left edge of the background rectangle
         $p = (double) $bg_y / 100.0;
         $y1 = $p * $img_h;
         $y2 = $p * $bg_height;
         $bg_y = $y2 - $y1;
     } else {
         $bg_y = (double) ($style->length_in_pt($bg_y) * $dpi) / 72;
     }
     $bg_y = round($bg_y + $style->length_in_pt($style->border_top_width) * $dpi / 72);
     //clip background to the image area on partial repeat. Nothing to do if img off area
     //On repeat, normalize start position to the tile at immediate left/top or 0/0 of area
     //On no repeat with positive offset: move size/start to have offset==0
     //Handle x/y Dimensions separately
     if ($repeat !== "repeat" && $repeat !== "repeat-x") {
         //No repeat x
         if ($bg_x < 0) {
             $bg_width = $img_w + $bg_x;
         } else {
             $x += $bg_x * 72 / $dpi;
             $bg_width = $bg_width - $bg_x;
             if ($bg_width > $img_w) {
                 $bg_width = $img_w;
             }
             $bg_x = 0;
         }
         if ($bg_width <= 0) {
             return;
         }
         $width = (double) ($bg_width * 72) / $dpi;
     } else {
         //repeat x
         if ($bg_x < 0) {
             $bg_x = -(-$bg_x % $img_w);
         } else {
             $bg_x = $bg_x % $img_w;
             if ($bg_x > 0) {
                 $bg_x -= $img_w;
//.........这里部分代码省略.........

 /**
  * Render a background image over a rectangular area
  *
  * @param string $img      The background image to load
  * @param float  $x        The left edge of the rectangular area
  * @param float  $y        The top edge of the rectangular area
  * @param float  $width    The width of the rectangular area
  * @param float  $height   The height of the rectangular area
  * @param Style  $style    The associated Style object
  */
 protected function _background_image($url, $x, $y, $width, $height, $style)
 {
     $sheet = $style->get_stylesheet();
     // Skip degenerate cases
     if ($width == 0 || $height == 0) {
         return;
     }
     //debugpng
     if (DEBUGPNG) {
         print '[_background_image ' . $url . ']';
     }
     list($img, $ext) = Image_Cache::resolve_url($url, $sheet->get_protocol(), $sheet->get_host(), $sheet->get_base_path());
     // Bail if the image is no good
     if ($img === DOMPDF_LIB_DIR . "/res/broken_image.png") {
         return;
     }
     //Try to optimize away reading and composing of same background multiple times
     //Postponing read with imagecreatefrom   ...()
     //final composition paramters and name not known yet
     //Therefore read dimension directly from file, instead of creating gd object first.
     //$img_w = imagesx($src); $img_h = imagesy($src);
     list($img_w, $img_h) = getimagesize($img);
     if (!isset($img_w) || $img_w == 0 || !isset($img_h) || $img_h == 0) {
         return;
     }
     $repeat = $style->background_repeat;
     $bg_color = $style->background_color;
     //Increase background resolution and dependent box size according to image resolution to be placed in
     //Then image can be copied in without resize
     $bg_width = round((double) ($width * DOMPDF_DPI) / 72);
     $bg_height = round((double) ($height * DOMPDF_DPI) / 72);
     //Need %bg_x, $bg_y as background pos, where img starts, converted to pixel
     list($bg_x, $bg_y) = $style->background_position;
     if (is_percent($bg_x)) {
         // The point $bg_x % from the left edge of the image is placed
         // $bg_x % from the left edge of the background rectangle
         $p = (double) $bg_x / 100.0;
         $x1 = $p * $img_w;
         $x2 = $p * $bg_width;
         $bg_x = round($x2 - $x1);
     } else {
         $bg_x = round((double) ($style->length_in_pt($bg_x) * DOMPDF_DPI) / 72);
     }
     if (is_percent($bg_y)) {
         // The point $bg_y % from the left edge of the image is placed
         // $bg_y % from the left edge of the background rectangle
         $p = (double) $bg_y / 100.0;
         $y1 = $p * $img_h;
         $y2 = $p * $bg_height;
         $bg_y = round($y2 - $y1);
     } else {
         $bg_y = round((double) ($style->length_in_pt($bg_y) * DOMPDF_DPI) / 72);
     }
     //clip background to the image area on partial repeat. Nothing to do if img off area
     //On repeat, normalize start position to the tile at immediate left/top or 0/0 of area
     //On no repeat with positive offset: move size/start to have offset==0
     //Handle x/y Dimensions separately
     if ($repeat !== "repeat" && $repeat !== "repeat-x") {
         //No repeat x
         if ($bg_x < 0) {
             $bg_width = $img_w + $bg_x;
         } else {
             $x += $bg_x * 72 / DOMPDF_DPI;
             $bg_width = $bg_width - $bg_x;
             if ($bg_width > $img_w) {
                 $bg_width = $img_w;
             }
             $bg_x = 0;
         }
         if ($bg_width <= 0) {
             return;
         }
         $width = (double) ($bg_width * 72) / DOMPDF_DPI;
     } else {
         //repeat x
         if ($bg_x < 0) {
             $bg_x = -(-$bg_x % $img_w);
         } else {
             $bg_x = $bg_x % $img_w;
             if ($bg_x > 0) {
                 $bg_x -= $img_w;
             }
         }
     }
     if ($repeat !== "repeat" && $repeat !== "repeat-y") {
         //no repeat y
         if ($bg_y < 0) {
             $bg_height = $img_h + $bg_y;
         } else {
             $y += $bg_y * 72 / DOMPDF_DPI;
//.........这里部分代码省略.........

 /**
  * Render a background image over a rectangular area
  *
  * @param string $img      The background image to load
  * @param float  $x        The left edge of the rectangular area
  * @param float  $y        The top edge of the rectangular area
  * @param float  $width    The width of the rectangular area
  * @param float  $height   The height of the rectangular area
  * @param Style  $style    The associated Style object
  */
 protected function _background_image($url, $x, $y, $width, $height, $style)
 {
     $sheet = $style->get_stylesheet();
     // Skip degenerate cases
     if ($width == 0 || $height == 0) {
         return;
     }
     list($img, $ext) = Image_Cache::resolve_url($url, $sheet->get_protocol(), $sheet->get_host(), $sheet->get_base_path());
     list($bg_x, $bg_y) = $style->background_position;
     $repeat = $style->background_repeat;
     if (!is_percent($bg_x)) {
         $bg_x = $style->length_in_pt($bg_x);
     }
     if (!is_percent($bg_y)) {
         $bg_y = $style->length_in_pt($bg_y);
     }
     $repeat = $style->background_repeat;
     $position = $style->background_position;
     $bg_color = $style->background_color;
     // Bail if the image is no good
     if ($img == DOMPDF_LIB_DIR . "/res/broken_image.png") {
         return;
     }
     $ext = strtolower($ext);
     list($img_w, $img_h) = getimagesize($img);
     $bg_width = round($width * DOMPDF_DPI / 72);
     $bg_height = round($height * DOMPDF_DPI / 72);
     // Create a new image to fit over the background rectangle
     $bg = imagecreatetruecolor($bg_width, $bg_height);
     if ($bg_color == "transparent") {
         $bg_color = array(1, 1, 1);
     }
     list($r, $g, $b) = $bg_color;
     $r *= 255;
     $g *= 255;
     $b *= 255;
     // Clip values
     $r = $r > 255 ? 255 : $r;
     $g = $g > 255 ? 255 : $g;
     $b = $b > 255 ? 255 : $b;
     $r = $r < 0 ? 0 : $r;
     $g = $g < 0 ? 0 : $g;
     $b = $b < 0 ? 0 : $b;
     $clear = imagecolorallocate($bg, round($r), round($g), round($b));
     imagecolortransparent($bg, $clear);
     imagefill($bg, 1, 1, $clear);
     switch ($ext) {
         case "png":
             $src = imagecreatefrompng($img);
             break;
         case "jpg":
         case "jpeg":
             $src = imagecreatefromjpeg($img);
             break;
         case "gif":
             $src = imagecreatefromgif($img);
             break;
         default:
             return;
             // Unsupported image type
     }
     if (is_percent($bg_x)) {
         // The point $bg_x % from the left edge of the image is placed
         // $bg_x % from the left edge of the background rectangle
         $p = (double) $bg_x / 100.0;
         $x1 = $p * $img_w;
         $x2 = $p * $bg_width;
         $bg_x = $x2 - $x1;
     }
     if (is_percent($bg_y)) {
         // The point $bg_y % from the left edge of the image is placed
         // $bg_y % from the left edge of the background rectangle
         $p = (double) $bg_y / 100.0;
         $y1 = $p * $img_h;
         $y2 = $p * $bg_height;
         $bg_y = $y2 - $y1;
     }
     // Copy regions from the source image to the background
     if ($repeat == "no-repeat" || $repeat == "repeat-x" && $img_w >= $bg_width || $repeat == "repeat-y" && $img_h >= $bg_height || $repeat == "repeat" && $img_w >= $bg_width && $img_h >= $bg_height) {
         // Simply place the image on the background
         $src_x = 0;
         $src_y = 0;
         $dst_x = $bg_x;
         $dst_y = $bg_y;
         if ($bg_x < 0) {
             $dst_x = 0;
             $src_x = -$bg_x;
         }
         if ($bg_y < 0) {
             $dst_y = 0;
//.........这里部分代码省略.........