PHP操作Imagick库打印数字矩阵_PHP教程

PHP操作Imagick库可以实现不少图片效果，比如在一张图片上，打印8*10的数字矩阵。以上效果的实现方法如下：

PHP操作Imagick库代码

<ol class="dp-c">
<li class="alt"><span><span class="comment"><font color="#008200">//格子的尺寸 </font></span><span> </span></span></li>
<li class="">
<span></span><span class="vars"><font color="#dd0000">$grid_font_size</font></span><span> = 18;           </span><span class="comment"><font color="#008200">//字体大小 </font></span><span> </span>
</li>
<li class="alt">
<span></span><span class="vars"><font color="#dd0000">$grid_font_color</font></span><span> = </span><span class="string"><font color="#0000ff">"#000"</font></span><span>;      </span><span class="comment"><font color="#008200">//字体颜色 </font></span><span> </span>
</li>
<li class="">
<span></span><span class="vars"><font color="#dd0000">$grid_width</font></span><span> = 36;               </span><span class="comment"><font color="#008200">//格子的宽度 </font></span><span> </span>
</li>
<li class="alt">
<span></span><span class="vars"><font color="#dd0000">$grid_height</font></span><span> = 24;              </span><span class="comment"><font color="#008200">//格子的高度 </font></span><span> </span>
</li>
<li class="">
<span></span><span class="vars"><font color="#dd0000">$grid_origin_x</font></span><span> = 15;           </span><span class="comment"><font color="#008200">//左上角的数字的起始横坐标 </font></span><span> </span>
</li>
<li class="alt">
<span></span><span class="vars"><font color="#dd0000">$grid_origin_y</font></span><span> = 98;            </span><span class="comment"><font color="#008200">//左上角的数字的起始纵坐标 </font></span><span> </span>
</li>
<li class=""><span> </span></li>
<li class="alt"><span> #原图  </span></li>
<li class="">
<span> </span><span class="vars"><font color="#dd0000">$image</font></span><span> = </span><span class="keyword"><strong><font color="#006699">new</font></strong></span><span> Imagick(</span><span class="string"><font color="#0000ff">'background.jpg'</font></span><span>);  </span>
</li>
<li class="alt"><span>   </span></li>
<li class=""><span> #写入密保卡数据  </span></li>
<li class="alt">
<span> </span><span class="vars"><font color="#dd0000">$tmp_grid_origin_x</font></span><span> = </span><span class="vars"><font color="#dd0000">$grid_origin_x</font></span><span>;  </span>
</li>
<li class="">
<span> </span><span class="vars"><font color="#dd0000">$tmp_grid_origin_y</font></span><span> = </span><span class="vars"><font color="#dd0000">$grid_origin_y</font></span><span>;  </span>
</li>
<li class="alt">
<span> </span><span class="keyword"><strong><font color="#006699">foreach</font></strong></span><span> (</span><span class="vars"><font color="#dd0000">$pData</font></span><span> </span><span class="keyword"><strong><font color="#006699">as</font></strong></span><span> </span><span class="vars"><font color="#dd0000">$k</font></span><span> => </span><span class="vars"><font color="#dd0000">$v</font></span><span>){  </span>
</li>
<li class="">
<span>   </span><span class="keyword"><strong><font color="#006699">foreach</font></strong></span><span> (</span><span class="vars"><font color="#dd0000">$v</font></span><span> </span><span class="keyword"><strong><font color="#006699">as</font></strong></span><span> </span><span class="vars"><font color="#dd0000">$k_grid_data</font></span><span> => </span><span class="vars"><font color="#dd0000">$v_grid_data</font></span><span>){  </span>
</li>
<li class="alt">
<span>     </span><span class="vars"><font color="#dd0000">$tmp_grid_origin_x</font></span><span> += </span><span class="vars"><font color="#dd0000">$grid_width</font></span><span>;  </span>
</li>
<li class="">
<span>     </span><span class="vars"><font color="#dd0000">$draw</font></span><span> = </span><span class="keyword"><strong><font color="#006699">new</font></strong></span><span> ImagickDraw();  </span>
</li>
<li class="alt">
<span>     </span><span class="vars"><font color="#dd0000">$draw</font></span><span>->setFillColor(</span><span class="vars"><font color="#dd0000">$grid_font_color</font></span><span>);  </span>
</li>
<li class="">
<span>     </span><span class="vars"><font color="#dd0000">$draw</font></span><span>->setFontSize(</span><span class="vars"><font color="#dd0000">$grid_font_size</font></span><span>);  </span>
</li>
<li class="alt">
<span>     </span><span class="vars"><font color="#dd0000">$draw</font></span><span>->annotation(</span><span class="vars"><font color="#dd0000">$tmp_grid_origin_x</font></span><span>, </span><span class="vars"><font color="#dd0000">$tmp_grid_origin_y</font></span><span>, </span><span class="vars"><font color="#dd0000">$v_grid_data</font></span><span>);  </span>
</li>
<li class="">
<span>     </span><span class="vars"><font color="#dd0000">$image</font></span><span>->drawImage(</span><span class="vars"><font color="#dd0000">$draw</font></span><span>);  </span>
</li>
<li class="alt"><span>   }  </span></li>
<li class="">
<span>   </span><span class="vars"><font color="#dd0000">$tmp_grid_origin_x</font></span><span> = </span><span class="vars"><font color="#dd0000">$grid_origin_x</font></span><span>;  </span>
</li>
<li class="alt">
<span>   </span><span class="vars"><font color="#dd0000">$tmp_grid_origin_y</font></span><span> += </span><span class="vars"><font color="#dd0000">$grid_height</font></span><span>;  </span>
</li>
<li class=""><span> }  </span></li>
<li class="alt">
<span> </span><span class="vars"><font color="#dd0000">$image</font></span><span>->writeImage(</span><span class="vars"><font color="#dd0000">$ks_ImageSrcPath</font></span><span>. </span><span class="vars"><font color="#dd0000">$pSN</font></span><span>. </span><span class="string"><font color="#0000ff">'.jpg'</font></span><span>);  </span>
</li>
<li class=""><span> </span></li>
<li class="alt"><span> #释放资源  </span></li>
<li class="">
<span> </span><span class="vars"><font color="#dd0000">$image</font></span><span>->destroy();  </span>
</li>
<li class="alt">
<span> </span><span class="vars"><font color="#dd0000">$draw</font></span><span>->destroy();  </span>
</li>
<li class=""><span> </span></li>
</ol>

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：

<ol class="dp-c">
<li class="alt"><span><span class="vars"><font color="#dd0000">$draw</font></span><span> = </span><span class="keyword"><strong><font color="#006699">new</font></strong></span><span> ImagickDraw();  </span></span></li>
<li class="">
<span></span><span class="vars"><font color="#dd0000">$draw</font></span><span>->setFillColor(</span><span class="vars"><font color="#dd0000">$grid_font_color</font></span><span>);  </span>
</li>
<li class="alt">
<span></span><span class="vars"><font color="#dd0000">$draw</font></span><span>->setFontSize(</span><span class="vars"><font color="#dd0000">$grid_font_size</font></span><span>);  </span>
</li>
<li class="">
<span></span><span class="keyword"><strong><font color="#006699">foreach</font></strong></span><span> (</span><span class="vars"><font color="#dd0000">$pData</font></span><span> </span><span class="keyword"><strong><font color="#006699">as</font></strong></span><span> </span><span class="vars"><font color="#dd0000">$k</font></span><span> => </span><span class="vars"><font color="#dd0000">$v</font></span><span>){  </span>
</li>
<li class="alt">
<span>  </span><span class="keyword"><strong><font color="#006699">foreach</font></strong></span><span> (</span><span class="vars"><font color="#dd0000">$v</font></span><span> </span><span class="keyword"><strong><font color="#006699">as</font></strong></span><span> </span><span class="vars"><font color="#dd0000">$k_grid_data</font></span><span> => </span><span class="vars"><font color="#dd0000">$v_grid_data</font></span><span>){  </span>
</li>
<li class="">
<span>    </span><span class="vars"><font color="#dd0000">$tmp_grid_origin_x</font></span><span> += </span><span class="vars"><font color="#dd0000">$grid_width</font></span><span>;  </span>
</li>
<li class="alt">
<span>    </span><span class="vars"><font color="#dd0000">$draw</font></span><span>->annotation(</span><span class="vars"><font color="#dd0000">$tmp_grid_origin_x</font></span><span>, </span><span class="vars"><font color="#dd0000">$tmp_grid_origin_y</font></span><span>, </span><span class="vars"><font color="#dd0000">$v_grid_data</font></span><span>);  </span>
</li>
<li class=""><span>  }  </span></li>
<li class="alt">
<span>   </span><span class="vars"><font color="#dd0000">$tmp_grid_origin_x</font></span><span> = </span><span class="vars"><font color="#dd0000">$grid_origin_x</font></span><span>;  </span>
</li>
<li class="">
<span>   </span><span class="vars"><font color="#dd0000">$tmp_grid_origin_y</font></span><span> += </span><span class="vars"><font color="#dd0000">$grid_height</font></span><span>;  </span>
</li>
<li class="alt"><span>}  </span></li>
<li class="">
<span></span><span class="vars"><font color="#dd0000">$image</font></span><span>->drawImage(</span><span class="vars"><font color="#dd0000">$draw</font></span><span>);  </span>
</li>
</ol>

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