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point.html 8.7 KB
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  68.   <div class="section" id="point">
    69. 

  69. <h1>Point</h1>
    70. 

  70. <div class="contents local topic" id="contents">
    71. 

  71. <ul class="simple">
    72. 

  72. <li><a class="reference internal" href="#overview" id="id1">Overview</a></li>
    73. 

  73. <li><a class="reference internal" href="#models" id="id2">Models</a></li>
    74. 

  74. </ul>
    75. 

  75. </div>
    76. 

  76. <div class="section" id="overview">
    77. 

  77. <h2><a class="toc-backref" href="#id1">Overview</a></h2>
    78. 

  78. <p>A point defines the location of a pixel inside an image. It can also be used
    79. 

  79. to describe the dimensions of an image. In most general terms, points are
    80. 

  80. N-dimensional and model the following concept:</p>
    81. 

  81. <div class="highlight-cpp"><div class="highlight"><pre><span class="n">concept</span> <span class="n">PointNDConcept</span><span class="o">&lt;</span><span class="k">typename</span> <span class="n">T</span><span class="o">&gt;</span> <span class="o">:</span> <span class="n">Regular</span><span class="o">&lt;</span><span class="n">T</span><span class="o">&gt;</span>
    82. 

  82. <span class="p">{</span>
    83. 

  83.     <span class="c1">// the type of a coordinate along each axis</span>
    84. 

  84.     <span class="k">template</span> <span class="o">&lt;</span><span class="kt">size_t</span> <span class="n">K</span><span class="o">&gt;</span> <span class="k">struct</span> <span class="n">axis</span><span class="p">;</span> <span class="n">where</span> <span class="n">Metafunction</span><span class="o">&lt;</span><span class="n">axis</span><span class="o">&gt;</span><span class="p">;</span>
    85. 

  85. 

  86.     <span class="k">const</span> <span class="kt">size_t</span> <span class="n">num_dimensions</span><span class="p">;</span>
    87. 

  87. 

  88.     <span class="c1">// accessor/modifier of the value of each axis.</span>
    89. 

  89.     <span class="k">template</span> <span class="o">&lt;</span><span class="kt">size_t</span> <span class="n">K</span><span class="o">&gt;</span> <span class="k">const</span> <span class="k">typename</span> <span class="n">axis</span><span class="o">&lt;</span><span class="n">K</span><span class="o">&gt;::</span><span class="n">type</span><span class="o">&amp;</span> <span class="n">T</span><span class="o">::</span><span class="n">axis_value</span><span class="p">()</span> <span class="k">const</span><span class="p">;</span>
    90. 

  90.     <span class="k">template</span> <span class="o">&lt;</span><span class="kt">size_t</span> <span class="n">K</span><span class="o">&gt;</span>       <span class="k">typename</span> <span class="n">axis</span><span class="o">&lt;</span><span class="n">K</span><span class="o">&gt;::</span><span class="n">type</span><span class="o">&amp;</span> <span class="n">T</span><span class="o">::</span><span class="n">axis_value</span><span class="p">();</span>
    91. 

  91. <span class="p">};</span>
    92. 

  92. </pre></div>
    93. 

  93. </div>
    94. 

  94. <p>GIL uses a two-dimensional point, which is a refinement of <code class="docutils literal"><span class="pre">PointNDConcept</span></code>
    95. 

  95. in which both dimensions are of the same type:</p>
    96. 

  96. <div class="highlight-cpp"><div class="highlight"><pre><span class="n">concept</span> <span class="n">Point2DConcept</span><span class="o">&lt;</span><span class="k">typename</span> <span class="n">T</span><span class="o">&gt;</span> <span class="o">:</span> <span class="n">PointNDConcept</span><span class="o">&lt;</span><span class="n">T</span><span class="o">&gt;</span>
    97. 

  97. <span class="p">{</span>
    98. 

  98.     <span class="n">where</span> <span class="n">num_dimensions</span> <span class="o">==</span> <span class="mi">2</span><span class="p">;</span>
    99. 

  99.     <span class="n">where</span> <span class="n">SameType</span><span class="o">&lt;</span><span class="n">axis</span><span class="o">&lt;</span><span class="mi">0</span><span class="o">&gt;::</span><span class="n">type</span><span class="p">,</span> <span class="n">axis</span><span class="o">&lt;</span><span class="mi">1</span><span class="o">&gt;::</span><span class="n">type</span><span class="o">&gt;</span><span class="p">;</span>
    100. 

  100. 

  101.     <span class="k">typename</span> <span class="n">value_type</span> <span class="o">=</span> <span class="n">axis</span><span class="o">&lt;</span><span class="mi">0</span><span class="o">&gt;::</span><span class="n">type</span><span class="p">;</span>
    102. 

  102. 

  103.     <span class="k">const</span> <span class="n">value_type</span><span class="o">&amp;</span> <span class="k">operator</span><span class="p">[](</span><span class="k">const</span> <span class="n">T</span><span class="o">&amp;</span><span class="p">,</span> <span class="kt">size_t</span> <span class="n">i</span><span class="p">);</span>
    104. 

  104.         <span class="n">value_type</span><span class="o">&amp;</span> <span class="k">operator</span><span class="p">[](</span>      <span class="n">T</span><span class="o">&amp;</span><span class="p">,</span> <span class="kt">size_t</span> <span class="n">i</span><span class="p">);</span>
    105. 

  105. 

  106.     <span class="n">value_type</span> <span class="n">x</span><span class="p">,</span><span class="n">y</span><span class="p">;</span>
    107. 

  107. <span class="p">};</span>
    108. 

  108. </pre></div>
    109. 

  109. </div>
    110. 

  110. <div class="admonition seealso">
    111. 

  111. <p class="first admonition-title">See also</p>
    112. 

  112. <ul class="last simple">
    113. 

  113. <li><a class="reference external" href="reference/structboost_1_1gil_1_1_point_n_d_concept.html">PointNDConcept</a></li>
    114. 

  114. <li><a class="reference external" href="reference/structboost_1_1gil_1_1_point2_d_concept.html">Point2DConcept</a></li>
    115. 

  115. </ul>
    116. 

  116. </div>
    117. 

  117. </div>
    118. 

  118. <div class="section" id="models">
    119. 

  119. <h2><a class="toc-backref" href="#id2">Models</a></h2>
    120. 

  120. <p>GIL provides a model of <code class="docutils literal"><span class="pre">Point2DConcept</span></code>, <code class="docutils literal"><span class="pre">point&lt;T&gt;</span></code> where <code class="docutils literal"><span class="pre">T</span></code> is the
    121. 

  121. coordinate type.</p>
    122. 

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  136.       Last updated on 2019-12-10 00:12:10.
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