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| author | Andrey Andreev <narf@devilix.net> | 2018-03-22 15:48:55 +0100 |
|---|---|---|
| committer | Andrey Andreev <narf@devilix.net> | 2018-03-22 15:48:55 +0100 |
| commit | 71e647782764184e3aab4faffe6d99176758979f (patch) | |
| tree | 74dbdd50a61cd5674915c144aca9ebbc00b235b8 /user_guide/libraries/image_lib.html | |
| parent | b12fbad77bd69ca0c7624a9094c29b7691ea6107 (diff) | |
[ci skip] 3.1.8 release
Diffstat (limited to 'user_guide/libraries/image_lib.html')
| -rw-r--r-- | user_guide/libraries/image_lib.html | 1255 |
1 files changed, 1255 insertions, 0 deletions
diff --git a/user_guide/libraries/image_lib.html b/user_guide/libraries/image_lib.html new file mode 100644 index 000000000..542fae956 --- /dev/null +++ b/user_guide/libraries/image_lib.html @@ -0,0 +1,1255 @@ + + +<!DOCTYPE html> +<!--[if IE 8]><html class="no-js lt-ie9" lang="en" > <![endif]--> +<!--[if gt IE 8]><!--> <html class="no-js" lang="en" > <!--<![endif]--> +<head> + <meta charset="utf-8"> + <meta name="viewport" content="width=device-width, initial-scale=1.0"> + + <title>Image Manipulation Class — CodeIgniter 3.1.8 documentation</title> + + + + + <link rel="shortcut icon" href="../_static/ci-icon.ico"/> + + + + <link href='https://fonts.googleapis.com/css?family=Lato:400,700,400italic,700italic|Roboto+Slab:400,700|Inconsolata:400,700&subset=latin,cyrillic' rel='stylesheet' type='text/css'> + + + + + + + + + + <link rel="stylesheet" href="../_static/css/citheme.css" type="text/css" /> + + + + <link rel="index" title="Index" + href="../genindex.html"/> + <link rel="search" 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+<li class="toctree-l2"><a class="reference internal" href="../helpers/xml_helper.html">XML Helper</a></li> +</ul> +</li> +</ul> + + + + </div> + + </nav> + + <section data-toggle="wy-nav-shift" class="wy-nav-content-wrap"> + + + <nav class="wy-nav-top" role="navigation" aria-label="top navigation"> + <i data-toggle="wy-nav-top" class="fa fa-bars"></i> + <a href="../index.html">CodeIgniter</a> + </nav> + + + + <div class="wy-nav-content"> + <div class="rst-content"> + <div role="navigation" aria-label="breadcrumbs navigation"> + <ul class="wy-breadcrumbs"> + <li><a href="../index.html">Docs</a> »</li> + + <li><a href="index.html">Libraries</a> »</li> + + <li>Image Manipulation Class</li> + <li class="wy-breadcrumbs-aside"> + + </li> + <div style="float:right;margin-left:5px;" id="closeMe"> + <img title="Classic Layout" alt="classic layout" src="data:image/gif;base64,R0lGODlhFAAUAJEAAAAAADMzM////wAAACH5BAUUAAIALAAAAAAUABQAAAImlI+py+0PU5gRBRDM3DxbWoXis42X13USOLauUIqnlsaH/eY6UwAAOw==" /> + </div> + </ul> + <hr/> +</div> + <div role="main" class="document"> + + <div class="section" id="image-manipulation-class"> +<h1>Image Manipulation Class<a class="headerlink" href="#image-manipulation-class" title="Permalink to this headline">¶</a></h1> +<p>CodeIgniter’s Image Manipulation class lets you perform the following +actions:</p> +<ul class="simple"> +<li>Image Resizing</li> +<li>Thumbnail Creation</li> +<li>Image Cropping</li> +<li>Image Rotating</li> +<li>Image Watermarking</li> +</ul> +<p>All three major image libraries are supported: GD/GD2, NetPBM, and +ImageMagick</p> +<div class="admonition note"> +<p class="first admonition-title">Note</p> +<p class="last">Watermarking is only available using the GD/GD2 library. In +addition, even though other libraries are supported, GD is required in +order for the script to calculate the image properties. The image +processing, however, will be performed with the library you specify.</p> +</div> +<div class="contents local topic" id="contents"> +<ul class="simple"> +<li><a class="reference internal" href="#initializing-the-class" id="id1">Initializing the Class</a><ul> +<li><a class="reference internal" href="#processing-an-image" id="id2">Processing an Image</a></li> +<li><a class="reference internal" href="#processing-methods" id="id3">Processing Methods</a></li> +<li><a class="reference internal" href="#preferences" id="id4">Preferences</a></li> +<li><a class="reference internal" href="#setting-preferences-in-a-config-file" id="id5">Setting preferences in a config file</a></li> +</ul> +</li> +<li><a class="reference internal" href="#image-watermarking" id="id6">Image Watermarking</a><ul> +<li><a class="reference internal" href="#two-types-of-watermarking" id="id7">Two Types of Watermarking</a></li> +<li><a class="reference internal" href="#watermarking-an-image" id="id8">Watermarking an Image</a></li> +<li><a class="reference internal" href="#watermarking-preferences" id="id9">Watermarking Preferences</a><ul> +<li><a class="reference internal" href="#text-preferences" id="id10">Text Preferences</a></li> +<li><a class="reference internal" href="#overlay-preferences" id="id11">Overlay Preferences</a></li> +</ul> +</li> +</ul> +</li> +<li><a class="reference internal" href="#class-reference" id="id12">Class Reference</a></li> +</ul> +</div> +<div class="custom-index container"></div><div class="section" id="initializing-the-class"> +<h2><a class="toc-backref" href="#id1">Initializing the Class</a><a class="headerlink" href="#initializing-the-class" title="Permalink to this headline">¶</a></h2> +<p>Like most other classes in CodeIgniter, the image class is initialized +in your controller using the $this->load->library function:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">load</span><span class="o">-></span><span class="na">library</span><span class="p">(</span><span class="s1">'image_lib'</span><span class="p">);</span> +</pre></div> +</div> +<p>Once the library is loaded it will be ready for use. The image library +object you will use to call all functions is: <code class="docutils literal"><span class="pre">$this->image_lib</span></code></p> +<div class="section" id="processing-an-image"> +<h3><a class="toc-backref" href="#id2">Processing an Image</a><a class="headerlink" href="#processing-an-image" title="Permalink to this headline">¶</a></h3> +<p>Regardless of the type of processing you would like to perform +(resizing, cropping, rotation, or watermarking), the general process is +identical. You will set some preferences corresponding to the action you +intend to perform, then call one of four available processing functions. +For example, to create an image thumbnail you’ll do this:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$config</span><span class="p">[</span><span class="s1">'image_library'</span><span class="p">]</span> <span class="o">=</span> <span class="s1">'gd2'</span><span class="p">;</span> +<span class="nv">$config</span><span class="p">[</span><span class="s1">'source_image'</span><span class="p">]</span> <span class="o">=</span> <span class="s1">'/path/to/image/mypic.jpg'</span><span class="p">;</span> +<span class="nv">$config</span><span class="p">[</span><span class="s1">'create_thumb'</span><span class="p">]</span> <span class="o">=</span> <span class="k">TRUE</span><span class="p">;</span> +<span class="nv">$config</span><span class="p">[</span><span class="s1">'maintain_ratio'</span><span class="p">]</span> <span class="o">=</span> <span class="k">TRUE</span><span class="p">;</span> +<span class="nv">$config</span><span class="p">[</span><span class="s1">'width'</span><span class="p">]</span> <span class="o">=</span> <span class="mi">75</span><span class="p">;</span> +<span class="nv">$config</span><span class="p">[</span><span class="s1">'height'</span><span class="p">]</span> <span class="o">=</span> <span class="mi">50</span><span class="p">;</span> + +<span class="nv">$this</span><span class="o">-></span><span class="na">load</span><span class="o">-></span><span class="na">library</span><span class="p">(</span><span class="s1">'image_lib'</span><span class="p">,</span> <span class="nv">$config</span><span class="p">);</span> + +<span class="nv">$this</span><span class="o">-></span><span class="na">image_lib</span><span class="o">-></span><span class="na">resize</span><span class="p">();</span> +</pre></div> +</div> +<p>The above code tells the image_resize function to look for an image +called <em>mypic.jpg</em> located in the source_image folder, then create a +thumbnail that is 75 X 50 pixels using the GD2 image_library. Since the +maintain_ratio option is enabled, the thumb will be as close to the +target width and height as possible while preserving the original aspect +ratio. The thumbnail will be called <em>mypic_thumb.jpg</em> and located at +the same level as <em>source_image</em>.</p> +<div class="admonition note"> +<p class="first admonition-title">Note</p> +<p class="last">In order for the image class to be allowed to do any +processing, the folder containing the image files must have write +permissions.</p> +</div> +<div class="admonition note"> +<p class="first admonition-title">Note</p> +<p class="last">Image processing can require a considerable amount of server +memory for some operations. If you are experiencing out of memory errors +while processing images you may need to limit their maximum size, and/or +adjust PHP memory limits.</p> +</div> +</div> +<div class="section" id="processing-methods"> +<h3><a class="toc-backref" href="#id3">Processing Methods</a><a class="headerlink" href="#processing-methods" title="Permalink to this headline">¶</a></h3> +<p>There are four available processing methods:</p> +<ul class="simple"> +<li>$this->image_lib->resize()</li> +<li>$this->image_lib->crop()</li> +<li>$this->image_lib->rotate()</li> +<li>$this->image_lib->watermark()</li> +</ul> +<p>These methods return boolean TRUE upon success and FALSE for failure. +If they fail you can retrieve the error message using this function:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="k">echo</span> <span class="nv">$this</span><span class="o">-></span><span class="na">image_lib</span><span class="o">-></span><span class="na">display_errors</span><span class="p">();</span> +</pre></div> +</div> +<p>A good practice is to use the processing function conditionally, showing an +error upon failure, like this:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="k">if</span> <span class="p">(</span> <span class="o">!</span> <span class="nv">$this</span><span class="o">-></span><span class="na">image_lib</span><span class="o">-></span><span class="na">resize</span><span class="p">())</span> +<span class="p">{</span> + <span class="k">echo</span> <span class="nv">$this</span><span class="o">-></span><span class="na">image_lib</span><span class="o">-></span><span class="na">display_errors</span><span class="p">();</span> +<span class="p">}</span> +</pre></div> +</div> +<div class="admonition note"> +<p class="first admonition-title">Note</p> +<p>You can optionally specify the HTML formatting to be applied to +the errors, by submitting the opening/closing tags in the function, +like this:</p> +<div class="last highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">image_lib</span><span class="o">-></span><span class="na">display_errors</span><span class="p">(</span><span class="s1">'<p>'</span><span class="p">,</span> <span class="s1">'</p>'</span><span class="p">);</span> +</pre></div> +</div> +</div> +</div> +<div class="section" id="preferences"> +<span id="processing-preferences"></span><h3><a class="toc-backref" href="#id4">Preferences</a><a class="headerlink" href="#preferences" title="Permalink to this headline">¶</a></h3> +<p>The preferences described below allow you to tailor the image processing +to suit your needs.</p> +<p>Note that not all preferences are available for every function. For +example, the x/y axis preferences are only available for image cropping. +Likewise, the width and height preferences have no effect on cropping. +The “availability” column indicates which functions support a given +preference.</p> +<p>Availability Legend:</p> +<ul class="simple"> +<li>R - Image Resizing</li> +<li>C - Image Cropping</li> +<li>X - Image Rotation</li> +<li>W - Image Watermarking</li> +</ul> +<table border="1" class="docutils"> +<colgroup> +<col width="14%" /> +<col width="14%" /> +<col width="19%" /> +<col width="45%" /> +<col width="8%" /> +</colgroup> +<thead valign="bottom"> +<tr class="row-odd"><th class="head">Preference</th> +<th class="head">Default Value</th> +<th class="head">Options</th> +<th class="head">Description</th> +<th class="head">Availability</th> +</tr> +</thead> +<tbody valign="top"> +<tr class="row-even"><td><strong>image_library</strong></td> +<td>GD2</td> +<td>GD, GD2, ImageMagick, NetPBM</td> +<td>Sets the image library to be used.</td> +<td>R, C, X, W</td> +</tr> +<tr class="row-odd"><td><strong>library_path</strong></td> +<td>None</td> +<td>None</td> +<td>Sets the server path to your ImageMagick or NetPBM library. If you use +either of those libraries you must supply the path.</td> +<td>R, C, X +R, C, S, W</td> +</tr> +<tr class="row-even"><td><strong>source_image</strong></td> +<td>None</td> +<td>None</td> +<td>Sets the source image name/path. The path must be a relative or absolute +server path, not a URL.</td> +<td> </td> +</tr> +<tr class="row-odd"><td><strong>dynamic_output</strong></td> +<td>FALSE</td> +<td>TRUE/FALSE (boolean)</td> +<td>Determines whether the new image file should be written to disk or +generated dynamically. Note: If you choose the dynamic setting, only one +image can be shown at a time, and it can’t be positioned on the page. It +simply outputs the raw image dynamically to your browser, along with +image headers.</td> +<td>R, C, X, W</td> +</tr> +<tr class="row-even"><td><strong>file_permissions</strong></td> +<td>0644</td> +<td>(integer)</td> +<td>File system permissions to apply on the resulting image file, +writing it to the disk. WARNING: Use octal integer notation!</td> +<td>R, C, X, W</td> +</tr> +<tr class="row-odd"><td><strong>quality</strong></td> +<td>90%</td> +<td>1 - 100%</td> +<td>Sets the quality of the image. The higher the quality the larger the +file size.</td> +<td>R, C, X, W</td> +</tr> +<tr class="row-even"><td><strong>new_image</strong></td> +<td>None</td> +<td>None</td> +<td>Sets the destination image name/path. You’ll use this preference when +creating an image copy. The path must be a relative or absolute server +path, not a URL.</td> +<td>R, C, X, W</td> +</tr> +<tr class="row-odd"><td><strong>width</strong></td> +<td>None</td> +<td>None</td> +<td>Sets the width you would like the image set to.</td> +<td>R, C</td> +</tr> +<tr class="row-even"><td><strong>height</strong></td> +<td>None</td> +<td>None</td> +<td>Sets the height you would like the image set to.</td> +<td>R, C</td> +</tr> +<tr class="row-odd"><td><strong>create_thumb</strong></td> +<td>FALSE</td> +<td>TRUE/FALSE (boolean)</td> +<td>Tells the image processing function to create a thumb.</td> +<td>R</td> +</tr> +<tr class="row-even"><td><strong>thumb_marker</strong></td> +<td>_thumb</td> +<td>None</td> +<td>Specifies the thumbnail indicator. It will be inserted just before the +file extension, so mypic.jpg would become mypic_thumb.jpg</td> +<td>R</td> +</tr> +<tr class="row-odd"><td><strong>maintain_ratio</strong></td> +<td>TRUE</td> +<td>TRUE/FALSE (boolean)</td> +<td>Specifies whether to maintain the original aspect ratio when resizing or +use hard values.</td> +<td>R, C</td> +</tr> +<tr class="row-even"><td><strong>master_dim</strong></td> +<td>auto</td> +<td>auto, width, height</td> +<td>Specifies what to use as the master axis when resizing or creating +thumbs. For example, let’s say you want to resize an image to 100 X 75 +pixels. If the source image size does not allow perfect resizing to +those dimensions, this setting determines which axis should be used as +the hard value. “auto” sets the axis automatically based on whether the +image is taller than wider, or vice versa.</td> +<td>R</td> +</tr> +<tr class="row-odd"><td><strong>rotation_angle</strong></td> +<td>None</td> +<td>90, 180, 270, vrt, hor</td> +<td>Specifies the angle of rotation when rotating images. Note that PHP +rotates counter-clockwise, so a 90 degree rotation to the right must be +specified as 270.</td> +<td>X</td> +</tr> +<tr class="row-even"><td><strong>x_axis</strong></td> +<td>None</td> +<td>None</td> +<td>Sets the X coordinate in pixels for image cropping. For example, a +setting of 30 will crop an image 30 pixels from the left.</td> +<td>C</td> +</tr> +<tr class="row-odd"><td><strong>y_axis</strong></td> +<td>None</td> +<td>None</td> +<td>Sets the Y coordinate in pixels for image cropping. For example, a +setting of 30 will crop an image 30 pixels from the top.</td> +<td>C</td> +</tr> +</tbody> +</table> +</div> +<div class="section" id="setting-preferences-in-a-config-file"> +<h3><a class="toc-backref" href="#id5">Setting preferences in a config file</a><a class="headerlink" href="#setting-preferences-in-a-config-file" title="Permalink to this headline">¶</a></h3> +<p>If you prefer not to set preferences using the above method, you can +instead put them into a config file. Simply create a new file called +image_lib.php, add the $config array in that file. Then save the file +in <em>config/image_lib.php</em> and it will be used automatically. You will +NOT need to use the <code class="docutils literal"><span class="pre">$this->image_lib->initialize()</span></code> method if you save +your preferences in a config file.</p> +</div> +</div> +<div class="section" id="image-watermarking"> +<h2><a class="toc-backref" href="#id6">Image Watermarking</a><a class="headerlink" href="#image-watermarking" title="Permalink to this headline">¶</a></h2> +<p>The Watermarking feature requires the GD/GD2 library.</p> +<div class="section" id="two-types-of-watermarking"> +<h3><a class="toc-backref" href="#id7">Two Types of Watermarking</a><a class="headerlink" href="#two-types-of-watermarking" title="Permalink to this headline">¶</a></h3> +<p>There are two types of watermarking that you can use:</p> +<ul class="simple"> +<li><strong>Text</strong>: The watermark message will be generated using text, either +with a True Type font that you specify, or using the native text +output that the GD library supports. If you use the True Type version +your GD installation must be compiled with True Type support (most +are, but not all).</li> +<li><strong>Overlay</strong>: The watermark message will be generated by overlaying an +image (usually a transparent PNG or GIF) containing your watermark +over the source image.</li> +</ul> +</div> +<div class="section" id="watermarking-an-image"> +<span id="watermarking"></span><h3><a class="toc-backref" href="#id8">Watermarking an Image</a><a class="headerlink" href="#watermarking-an-image" title="Permalink to this headline">¶</a></h3> +<p>Just as with the other methods (resizing, cropping, and rotating) the +general process for watermarking involves setting the preferences +corresponding to the action you intend to perform, then calling the +watermark function. Here is an example:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$config</span><span class="p">[</span><span class="s1">'source_image'</span><span class="p">]</span> <span class="o">=</span> <span class="s1">'/path/to/image/mypic.jpg'</span><span class="p">;</span> +<span class="nv">$config</span><span class="p">[</span><span class="s1">'wm_text'</span><span class="p">]</span> <span class="o">=</span> <span class="s1">'Copyright 2006 - John Doe'</span><span class="p">;</span> +<span class="nv">$config</span><span class="p">[</span><span class="s1">'wm_type'</span><span class="p">]</span> <span class="o">=</span> <span class="s1">'text'</span><span class="p">;</span> +<span class="nv">$config</span><span class="p">[</span><span class="s1">'wm_font_path'</span><span class="p">]</span> <span class="o">=</span> <span class="s1">'./system/fonts/texb.ttf'</span><span class="p">;</span> +<span class="nv">$config</span><span class="p">[</span><span class="s1">'wm_font_size'</span><span class="p">]</span> <span class="o">=</span> <span class="s1">'16'</span><span class="p">;</span> +<span class="nv">$config</span><span class="p">[</span><span class="s1">'wm_font_color'</span><span class="p">]</span> <span class="o">=</span> <span class="s1">'ffffff'</span><span class="p">;</span> +<span class="nv">$config</span><span class="p">[</span><span class="s1">'wm_vrt_alignment'</span><span class="p">]</span> <span class="o">=</span> <span class="s1">'bottom'</span><span class="p">;</span> +<span class="nv">$config</span><span class="p">[</span><span class="s1">'wm_hor_alignment'</span><span class="p">]</span> <span class="o">=</span> <span class="s1">'center'</span><span class="p">;</span> +<span class="nv">$config</span><span class="p">[</span><span class="s1">'wm_padding'</span><span class="p">]</span> <span class="o">=</span> <span class="s1">'20'</span><span class="p">;</span> + +<span class="nv">$this</span><span class="o">-></span><span class="na">image_lib</span><span class="o">-></span><span class="na">initialize</span><span class="p">(</span><span class="nv">$config</span><span class="p">);</span> + +<span class="nv">$this</span><span class="o">-></span><span class="na">image_lib</span><span class="o">-></span><span class="na">watermark</span><span class="p">();</span> +</pre></div> +</div> +<p>The above example will use a 16 pixel True Type font to create the text +“Copyright 2006 - John Doe”. The watermark will be positioned at the +bottom/center of the image, 20 pixels from the bottom of the image.</p> +<div class="admonition note"> +<p class="first admonition-title">Note</p> +<p class="last">In order for the image class to be allowed to do any +processing, the image file must have “write” file permissions +For example, 777.</p> +</div> +</div> +<div class="section" id="watermarking-preferences"> +<h3><a class="toc-backref" href="#id9">Watermarking Preferences</a><a class="headerlink" href="#watermarking-preferences" title="Permalink to this headline">¶</a></h3> +<p>This table shows the preferences that are available for both types of +watermarking (text or overlay)</p> +<table border="1" class="docutils"> +<colgroup> +<col width="17%" /> +<col width="14%" /> +<col width="17%" /> +<col width="53%" /> +</colgroup> +<thead valign="bottom"> +<tr class="row-odd"><th class="head">Preference</th> +<th class="head">Default Value</th> +<th class="head">Options</th> +<th class="head">Description</th> +</tr> +</thead> +<tbody valign="top"> +<tr class="row-even"><td><strong>wm_type</strong></td> +<td>text</td> +<td>text, overlay</td> +<td>Sets the type of watermarking that should be used.</td> +</tr> +<tr class="row-odd"><td><strong>source_image</strong></td> +<td>None</td> +<td>None</td> +<td>Sets the source image name/path. The path must be a relative or absolute +server path, not a URL.</td> +</tr> +<tr class="row-even"><td><strong>dynamic_output</strong></td> +<td>FALSE</td> +<td>TRUE/FALSE (boolean)</td> +<td>Determines whether the new image file should be written to disk or +generated dynamically. Note: If you choose the dynamic setting, only one +image can be shown at a time, and it can’t be positioned on the page. It +simply outputs the raw image dynamically to your browser, along with +image headers.</td> +</tr> +<tr class="row-odd"><td><strong>quality</strong></td> +<td>90%</td> +<td>1 - 100%</td> +<td>Sets the quality of the image. The higher the quality the larger the +file size.</td> +</tr> +<tr class="row-even"><td><strong>wm_padding</strong></td> +<td>None</td> +<td>A number</td> +<td>The amount of padding, set in pixels, that will be applied to the +watermark to set it away from the edge of your images.</td> +</tr> +<tr class="row-odd"><td><strong>wm_vrt_alignment</strong></td> +<td>bottom</td> +<td>top, middle, bottom</td> +<td>Sets the vertical alignment for the watermark image.</td> +</tr> +<tr class="row-even"><td><strong>wm_hor_alignment</strong></td> +<td>center</td> +<td>left, center, right</td> +<td>Sets the horizontal alignment for the watermark image.</td> +</tr> +<tr class="row-odd"><td><strong>wm_hor_offset</strong></td> +<td>None</td> +<td>None</td> +<td>You may specify a horizontal offset (in pixels) to apply to the +watermark position. The offset normally moves the watermark to the +right, except if you have your alignment set to “right” then your offset +value will move the watermark toward the left of the image.</td> +</tr> +<tr class="row-even"><td><strong>wm_vrt_offset</strong></td> +<td>None</td> +<td>None</td> +<td>You may specify a vertical offset (in pixels) to apply to the watermark +position. The offset normally moves the watermark down, except if you +have your alignment set to “bottom” then your offset value will move the +watermark toward the top of the image.</td> +</tr> +</tbody> +</table> +<div class="section" id="text-preferences"> +<h4><a class="toc-backref" href="#id10">Text Preferences</a><a class="headerlink" href="#text-preferences" title="Permalink to this headline">¶</a></h4> +<p>This table shows the preferences that are available for the text type of +watermarking.</p> +<table border="1" class="docutils"> +<colgroup> +<col width="17%" /> +<col width="14%" /> +<col width="14%" /> +<col width="55%" /> +</colgroup> +<thead valign="bottom"> +<tr class="row-odd"><th class="head">Preference</th> +<th class="head">Default Value</th> +<th class="head">Options</th> +<th class="head">Description</th> +</tr> +</thead> +<tbody valign="top"> +<tr class="row-even"><td><strong>wm_text</strong></td> +<td>None</td> +<td>None</td> +<td>The text you would like shown as the watermark. Typically this will be a +copyright notice.</td> +</tr> +<tr class="row-odd"><td><strong>wm_font_path</strong></td> +<td>None</td> +<td>None</td> +<td>The server path to the True Type Font you would like to use. If you do +not use this option, the native GD font will be used.</td> +</tr> +<tr class="row-even"><td><strong>wm_font_size</strong></td> +<td>16</td> +<td>None</td> +<td>The size of the text. Note: If you are not using the True Type option +above, the number is set using a range of 1 - 5. Otherwise, you can use +any valid pixel size for the font you’re using.</td> +</tr> +<tr class="row-odd"><td><strong>wm_font_color</strong></td> +<td>ffffff</td> +<td>None</td> +<td>The font color, specified in hex. Both the full 6-length (ie, 993300) and +the short three character abbreviated version (ie, fff) are supported.</td> +</tr> +<tr class="row-even"><td><strong>wm_shadow_color</strong></td> +<td>None</td> +<td>None</td> +<td>The color of the drop shadow, specified in hex. If you leave this blank +a drop shadow will not be used. Both the full 6-length (ie, 993300) and +the short three character abbreviated version (ie, fff) are supported.</td> +</tr> +<tr class="row-odd"><td><strong>wm_shadow_distance</strong></td> +<td>3</td> +<td>None</td> +<td>The distance (in pixels) from the font that the drop shadow should +appear.</td> +</tr> +</tbody> +</table> +</div> +<div class="section" id="overlay-preferences"> +<h4><a class="toc-backref" href="#id11">Overlay Preferences</a><a class="headerlink" href="#overlay-preferences" title="Permalink to this headline">¶</a></h4> +<p>This table shows the preferences that are available for the overlay type +of watermarking.</p> +<table border="1" class="docutils"> +<colgroup> +<col width="17%" /> +<col width="14%" /> +<col width="14%" /> +<col width="55%" /> +</colgroup> +<thead valign="bottom"> +<tr class="row-odd"><th class="head">Preference</th> +<th class="head">Default Value</th> +<th class="head">Options</th> +<th class="head">Description</th> +</tr> +</thead> +<tbody valign="top"> +<tr class="row-even"><td><strong>wm_overlay_path</strong></td> +<td>None</td> +<td>None</td> +<td>The server path to the image you wish to use as your watermark. Required +only if you are using the overlay method.</td> +</tr> +<tr class="row-odd"><td><strong>wm_opacity</strong></td> +<td>50</td> +<td>1 - 100</td> +<td>Image opacity. You may specify the opacity (i.e. transparency) of your +watermark image. This allows the watermark to be faint and not +completely obscure the details from the original image behind it. A 50% +opacity is typical.</td> +</tr> +<tr class="row-even"><td><strong>wm_x_transp</strong></td> +<td>4</td> +<td>A number</td> +<td>If your watermark image is a PNG or GIF image, you may specify a color +on the image to be “transparent”. This setting (along with the next) +will allow you to specify that color. This works by specifying the “X” +and “Y” coordinate pixel (measured from the upper left) within the image +that corresponds to a pixel representative of the color you want to be +transparent.</td> +</tr> +<tr class="row-odd"><td><strong>wm_y_transp</strong></td> +<td>4</td> +<td>A number</td> +<td>Along with the previous setting, this allows you to specify the +coordinate to a pixel representative of the color you want to be +transparent.</td> +</tr> +</tbody> +</table> +</div> +</div> +</div> +<div class="section" id="class-reference"> +<h2><a class="toc-backref" href="#id12">Class Reference</a><a class="headerlink" href="#class-reference" title="Permalink to this headline">¶</a></h2> +<dl class="class"> +<dt id="CI_Image_lib"> +<em class="property">class </em><code class="descname">CI_Image_lib</code><a class="headerlink" href="#CI_Image_lib" title="Permalink to this definition">¶</a></dt> +<dd><dl class="method"> +<dt id="CI_Image_lib::initialize"> +<code class="descname">initialize</code><span class="sig-paren">(</span><span class="optional">[</span><em>$props = array()</em><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_Image_lib::initialize" title="Permalink to this definition">¶</a></dt> +<dd><table class="docutils field-list" frame="void" rules="none"> +<col class="field-name" /> +<col class="field-body" /> +<tbody valign="top"> +<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple"> +<li><strong>$props</strong> (<em>array</em>) – Image processing preferences</li> +</ul> +</td> +</tr> +<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">TRUE on success, FALSE in case of invalid settings</p> +</td> +</tr> +<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">bool</p> +</td> +</tr> +</tbody> +</table> +<p>Initializes the class for processing an image.</p> +</dd></dl> + +<dl class="method"> +<dt id="CI_Image_lib::resize"> +<code class="descname">resize</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_Image_lib::resize" title="Permalink to this definition">¶</a></dt> +<dd><table class="docutils field-list" frame="void" rules="none"> +<col class="field-name" /> +<col class="field-body" /> +<tbody valign="top"> +<tr class="field-odd field"><th class="field-name">Returns:</th><td class="field-body">TRUE on success, FALSE on failure</td> +</tr> +<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">bool</td> +</tr> +</tbody> +</table> +<p>The image resizing method lets you resize the original image, create a +copy (with or without resizing), or create a thumbnail image.</p> +<p>For practical purposes there is no difference between creating a copy +and creating a thumbnail except a thumb will have the thumbnail marker +as part of the name (i.e. mypic_thumb.jpg).</p> +<p>All preferences listed in the <a class="reference internal" href="#processing-preferences"><span class="std std-ref">Preferences</span></a> table are available for this +method except these three: <em>rotation_angle</em>, <em>x_axis</em> and <em>y_axis</em>.</p> +<p><strong>Creating a Thumbnail</strong></p> +<p>The resizing method will create a thumbnail file (and preserve the +original) if you set this preference to TRUE:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$config</span><span class="p">[</span><span class="s1">'create_thumb'</span><span class="p">]</span> <span class="o">=</span> <span class="k">TRUE</span><span class="p">;</span> +</pre></div> +</div> +<p>This single preference determines whether a thumbnail is created or not.</p> +<p><strong>Creating a Copy</strong></p> +<p>The resizing method will create a copy of the image file (and preserve +the original) if you set a path and/or a new filename using this +preference:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$config</span><span class="p">[</span><span class="s1">'new_image'</span><span class="p">]</span> <span class="o">=</span> <span class="s1">'/path/to/new_image.jpg'</span><span class="p">;</span> +</pre></div> +</div> +<p>Notes regarding this preference:</p> +<ul class="simple"> +<li>If only the new image name is specified it will be placed in the same +folder as the original</li> +<li>If only the path is specified, the new image will be placed in the +destination with the same name as the original.</li> +<li>If both the path and image name are specified it will placed in its +own destination and given the new name.</li> +</ul> +<p><strong>Resizing the Original Image</strong></p> +<p>If neither of the two preferences listed above (create_thumb, and +new_image) are used, the resizing method will instead target the +original image for processing.</p> +</dd></dl> + +<dl class="method"> +<dt id="CI_Image_lib::crop"> +<code class="descname">crop</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_Image_lib::crop" title="Permalink to this definition">¶</a></dt> +<dd><table class="docutils field-list" frame="void" rules="none"> +<col class="field-name" /> +<col class="field-body" /> +<tbody valign="top"> +<tr class="field-odd field"><th class="field-name">Returns:</th><td class="field-body">TRUE on success, FALSE on failure</td> +</tr> +<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">bool</td> +</tr> +</tbody> +</table> +<p>The cropping method works nearly identically to the resizing function +except it requires that you set preferences for the X and Y axis (in +pixels) specifying where to crop, like this:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$config</span><span class="p">[</span><span class="s1">'x_axis'</span><span class="p">]</span> <span class="o">=</span> <span class="mi">100</span><span class="p">;</span> +<span class="nv">$config</span><span class="p">[</span><span class="s1">'y_axis'</span><span class="p">]</span> <span class="o">=</span> <span class="mi">40</span><span class="p">;</span> +</pre></div> +</div> +<p>All preferences listed in the <a class="reference internal" href="#processing-preferences"><span class="std std-ref">Preferences</span></a> table are available for this +method except these: <em>rotation_angle</em>, <em>create_thumb</em> and <em>new_image</em>.</p> +<p>Here’s an example showing how you might crop an image:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$config</span><span class="p">[</span><span class="s1">'image_library'</span><span class="p">]</span> <span class="o">=</span> <span class="s1">'imagemagick'</span><span class="p">;</span> +<span class="nv">$config</span><span class="p">[</span><span class="s1">'library_path'</span><span class="p">]</span> <span class="o">=</span> <span class="s1">'/usr/X11R6/bin/'</span><span class="p">;</span> +<span class="nv">$config</span><span class="p">[</span><span class="s1">'source_image'</span><span class="p">]</span> <span class="o">=</span> <span class="s1">'/path/to/image/mypic.jpg'</span><span class="p">;</span> +<span class="nv">$config</span><span class="p">[</span><span class="s1">'x_axis'</span><span class="p">]</span> <span class="o">=</span> <span class="mi">100</span><span class="p">;</span> +<span class="nv">$config</span><span class="p">[</span><span class="s1">'y_axis'</span><span class="p">]</span> <span class="o">=</span> <span class="mi">60</span><span class="p">;</span> + +<span class="nv">$this</span><span class="o">-></span><span class="na">image_lib</span><span class="o">-></span><span class="na">initialize</span><span class="p">(</span><span class="nv">$config</span><span class="p">);</span> + +<span class="k">if</span> <span class="p">(</span> <span class="o">!</span> <span class="nv">$this</span><span class="o">-></span><span class="na">image_lib</span><span class="o">-></span><span class="na">crop</span><span class="p">())</span> +<span class="p">{</span> + <span class="k">echo</span> <span class="nv">$this</span><span class="o">-></span><span class="na">image_lib</span><span class="o">-></span><span class="na">display_errors</span><span class="p">();</span> +<span class="p">}</span> +</pre></div> +</div> +<div class="admonition note"> +<p class="first admonition-title">Note</p> +<p class="last">Without a visual interface it is difficult to crop images, so this +method is not very useful unless you intend to build such an +interface. That’s exactly what we did using for the photo gallery module +in ExpressionEngine, the CMS we develop. We added a JavaScript UI that +lets the cropping area be selected.</p> +</div> +</dd></dl> + +<dl class="method"> +<dt id="CI_Image_lib::rotate"> +<code class="descname">rotate</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_Image_lib::rotate" title="Permalink to this definition">¶</a></dt> +<dd><table class="docutils field-list" frame="void" rules="none"> +<col class="field-name" /> +<col class="field-body" /> +<tbody valign="top"> +<tr class="field-odd field"><th class="field-name">Returns:</th><td class="field-body">TRUE on success, FALSE on failure</td> +</tr> +<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">bool</td> +</tr> +</tbody> +</table> +<p>The image rotation method requires that the angle of rotation be set +via its preference:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$config</span><span class="p">[</span><span class="s1">'rotation_angle'</span><span class="p">]</span> <span class="o">=</span> <span class="s1">'90'</span><span class="p">;</span> +</pre></div> +</div> +<p>There are 5 rotation options:</p> +<ol class="arabic simple"> +<li>90 - rotates counter-clockwise by 90 degrees.</li> +<li>180 - rotates counter-clockwise by 180 degrees.</li> +<li>270 - rotates counter-clockwise by 270 degrees.</li> +<li>hor - flips the image horizontally.</li> +<li>vrt - flips the image vertically.</li> +</ol> +<p>Here’s an example showing how you might rotate an image:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$config</span><span class="p">[</span><span class="s1">'image_library'</span><span class="p">]</span> <span class="o">=</span> <span class="s1">'netpbm'</span><span class="p">;</span> +<span class="nv">$config</span><span class="p">[</span><span class="s1">'library_path'</span><span class="p">]</span> <span class="o">=</span> <span class="s1">'/usr/bin/'</span><span class="p">;</span> +<span class="nv">$config</span><span class="p">[</span><span class="s1">'source_image'</span><span class="p">]</span> <span class="o">=</span> <span class="s1">'/path/to/image/mypic.jpg'</span><span class="p">;</span> +<span class="nv">$config</span><span class="p">[</span><span class="s1">'rotation_angle'</span><span class="p">]</span> <span class="o">=</span> <span class="s1">'hor'</span><span class="p">;</span> + +<span class="nv">$this</span><span class="o">-></span><span class="na">image_lib</span><span class="o">-></span><span class="na">initialize</span><span class="p">(</span><span class="nv">$config</span><span class="p">);</span> + +<span class="k">if</span> <span class="p">(</span> <span class="o">!</span> <span class="nv">$this</span><span class="o">-></span><span class="na">image_lib</span><span class="o">-></span><span class="na">rotate</span><span class="p">())</span> +<span class="p">{</span> + <span class="k">echo</span> <span class="nv">$this</span><span class="o">-></span><span class="na">image_lib</span><span class="o">-></span><span class="na">display_errors</span><span class="p">();</span> +<span class="p">}</span> +</pre></div> +</div> +</dd></dl> + +<dl class="method"> +<dt id="CI_Image_lib::watermark"> +<code class="descname">watermark</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_Image_lib::watermark" title="Permalink to this definition">¶</a></dt> +<dd><table class="docutils field-list" frame="void" rules="none"> +<col class="field-name" /> +<col class="field-body" /> +<tbody valign="top"> +<tr class="field-odd field"><th class="field-name">Returns:</th><td class="field-body">TRUE on success, FALSE on failure</td> +</tr> +<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">bool</td> +</tr> +</tbody> +</table> +<p>Creates a watermark over an image, please refer to the <a class="reference internal" href="#watermarking"><span class="std std-ref">Watermarking an Image</span></a> +section for more info.</p> +</dd></dl> + +<dl class="method"> +<dt id="CI_Image_lib::clear"> +<code class="descname">clear</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_Image_lib::clear" title="Permalink to this definition">¶</a></dt> +<dd><table class="docutils field-list" frame="void" rules="none"> +<col class="field-name" /> +<col class="field-body" /> +<tbody valign="top"> +<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body">void</td> +</tr> +</tbody> +</table> +<p>The clear method resets all of the values used when processing an +image. You will want to call this if you are processing images in a +loop.</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">image_lib</span><span class="o">-></span><span class="na">clear</span><span class="p">();</span> +</pre></div> +</div> +</dd></dl> + +<dl class="method"> +<dt id="CI_Image_lib::display_errors"> +<code class="descname">display_errors</code><span class="sig-paren">(</span><span class="optional">[</span><em>$open = '<p></em><span class="optional">[</span>, <em>$close = '</p>'</em><span class="optional">]</span><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_Image_lib::display_errors" title="Permalink to this definition">¶</a></dt> +<dd><table class="docutils field-list" frame="void" rules="none"> +<col class="field-name" /> +<col class="field-body" /> +<tbody valign="top"> +<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple"> +<li><strong>$open</strong> (<em>string</em>) – Error message opening tag</li> +<li><strong>$close</strong> (<em>string</em>) – Error message closing tag</li> +</ul> +</td> +</tr> +<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">Error messages</p> +</td> +</tr> +<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">string</p> +</td> +</tr> +</tbody> +</table> +<p>Returns all detected errors formatted as a string.</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="k">echo</span> <span class="nv">$this</span><span class="o">-></span><span class="na">image_lib</span><span class="o">-></span><span class="na">display_errors</span><span class="p">();</span> +</pre></div> +</div> +</dd></dl> + +</dd></dl> + +</div> +</div> + + + </div> + <footer> + + <div class="rst-footer-buttons" role="navigation" aria-label="footer navigation"> + + <a href="input.html" class="btn btn-neutral float-right" title="Input Class">Next <span class="fa fa-arrow-circle-right"></span></a> + + + <a href="ftp.html" class="btn btn-neutral" title="FTP Class"><span class="fa fa-arrow-circle-left"></span> Previous</a> + + </div> + + + <hr/> + + <div role="contentinfo"> + <p> + © Copyright 2014 - 2018, British Columbia Institute of Technology. + Last updated on Mar 22, 2018. + </p> + </div> + + Built with <a href="http://sphinx-doc.org/">Sphinx</a> using a <a href="https://github.com/snide/sphinx_rtd_theme">theme</a> provided by <a href="https://readthedocs.org">Read the Docs</a>. + +</footer> + </div> + </div> + + </section> + + </div> + + + + + + <script type="text/javascript"> + var DOCUMENTATION_OPTIONS = { + URL_ROOT:'../', + VERSION:'3.1.8', + COLLAPSE_INDEX:false, + FILE_SUFFIX:'.html', + HAS_SOURCE: false + }; + </script> + <script type="text/javascript" src="../_static/jquery.js"></script> + <script type="text/javascript" src="../_static/underscore.js"></script> + <script type="text/javascript" src="../_static/doctools.js"></script> + + + + + + <script type="text/javascript" src="../_static/js/theme.js"></script> + + + + + <script type="text/javascript"> + jQuery(function () { + SphinxRtdTheme.StickyNav.enable(); + }); + </script> + + +</body> +</html>
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