PHP操作Imagick库打印数字矩阵_PHP教程

PHP操作Imagick库代码

//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；

PHP操作Imagick库优化后代码如下：

$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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