PHP操作Imagick库

在一张图片上，打印8*10的数字矩阵，实现如下：

	//格子的尺寸
	$grid_font_size = 18;           //字体大小
	$grid_font_color = "#000";      //字体颜色
	$grid_width = 36;               //格子的宽度
	$grid_height = 24;              //格子的高度
	$grid_origin_x = 15;           //左上角的数字的起始横坐标
	$grid_origin_y = 98;            //左上角的数字的起始纵坐标

  #原图
  $image = new Imagick('background.jpg');
  
  #写入密保卡数据
  $tmp_grid_origin_x = $grid_origin_x;
  $tmp_grid_origin_y = $grid_origin_y;
  foreach ($pData as $k => $v){
    foreach ($v as $k_grid_data => $v_grid_data){
      $tmp_grid_origin_x += $grid_width;
      $draw = new ImagickDraw();
      $draw->setFillColor($grid_font_color);
      $draw->setFontSize($grid_font_size);
      $draw->annotation($tmp_grid_origin_x, $tmp_grid_origin_y, $v_grid_data);
      $image->drawImage($draw);
    }
    $tmp_grid_origin_x = $grid_origin_x;
    $tmp_grid_origin_y += $grid_height;
  }
  $image->writeImage($ks_ImageSrcPath. $pSN. '.jpg');

  #释放资源
  $image->destroy();
  $draw->destroy();

 

 

这样做的后果是，在每次循环的时候，都要实例化一个ImagickDraw，并执行drawImage方法，非常占用CPU资源。

可以从以下两点优化：

1. 不必每次都执行new操作，一个就够了；

2. 不必每次都执行drawImage方法，一次就够了。也就是说，annotation方法好像具有“附加”的意味，不用担心后来的覆盖掉之前的；

 

代码如下：

	      $draw = new ImagickDraw();
	      $draw->setFillColor($grid_font_color);
	      $draw->setFontSize($grid_font_size);
	      foreach ($pData as $k => $v){
	        foreach ($v as $k_grid_data => $v_grid_data){
	          $tmp_grid_origin_x += $grid_width;
	          $draw->annotation($tmp_grid_origin_x, $tmp_grid_origin_y, $v_grid_data);
	        }
          $tmp_grid_origin_x = $grid_origin_x;
          $tmp_grid_origin_y += $grid_height;
	      }
	      $image->drawImage($draw);

 

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2009-9-1 更新

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换种思路！

 

把8*10的数字矩阵看做“由80个数字、每10个换一行、每2个有一定间距”的字符串，哈！就可以从“调用80次annotation方法”减少到“调用1次”。

 

只是，我们不得不重新修改背景图的尺寸、“该字符串”在背景图的起始坐标等。

 

示例代码如下：

 

$numX = 0;
$str = '';
$tData = explode(",", $pData);
foreach ($tData as $d) {
  if (($numX++)%10 == 0) {
    $str .= "\n\n";
  }
  $str .= $d . "  "; 
}

$draw->setFillColor($grid_font_color);
$draw->setFontSize($grid_font_size);
$draw->annotation($grid_origin_x, $grid_origin_y, $str);

$image->drawImage($draw);