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<a href="SegmentPointComparator_8h.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span>&#160;<span class="comment">/**********************************************************************</span></div><div class="line"><a name="l00002"></a><span class="lineno"> 2</span>&#160;<span class="comment"> *</span></div><div class="line"><a name="l00003"></a><span class="lineno"> 3</span>&#160;<span class="comment"> * GEOS - Geometry Engine Open Source</span></div><div class="line"><a name="l00004"></a><span class="lineno"> 4</span>&#160;<span class="comment"> * http://geos.osgeo.org</span></div><div class="line"><a name="l00005"></a><span class="lineno"> 5</span>&#160;<span class="comment"> *</span></div><div class="line"><a name="l00006"></a><span class="lineno"> 6</span>&#160;<span class="comment"> * Copyright (C) 2006 Refractions Research Inc.</span></div><div class="line"><a name="l00007"></a><span class="lineno"> 7</span>&#160;<span class="comment"> *</span></div><div class="line"><a name="l00008"></a><span class="lineno"> 8</span>&#160;<span class="comment"> * This is free software; you can redistribute and/or modify it under</span></div><div class="line"><a name="l00009"></a><span class="lineno"> 9</span>&#160;<span class="comment"> * the terms of the GNU Lesser General Public Licence as published</span></div><div class="line"><a name="l00010"></a><span class="lineno"> 10</span>&#160;<span class="comment"> * by the Free Software Foundation.</span></div><div class="line"><a name="l00011"></a><span class="lineno"> 11</span>&#160;<span class="comment"> * See the COPYING file for more information.</span></div><div class="line"><a name="l00012"></a><span class="lineno"> 12</span>&#160;<span class="comment"> *</span></div><div class="line"><a name="l00013"></a><span class="lineno"> 13</span>&#160;<span class="comment"> **********************************************************************</span></div><div class="line"><a name="l00014"></a><span class="lineno"> 14</span>&#160;<span class="comment"> *</span></div><div class="line"><a name="l00015"></a><span class="lineno"> 15</span>&#160;<span class="comment"> * Last port: noding/SegmentPointComparator.java r320 (JTS-1.12)</span></div><div class="line"><a name="l00016"></a><span class="lineno"> 16</span>&#160;<span class="comment"> *</span></div><div class="line"><a name="l00017"></a><span class="lineno"> 17</span>&#160;<span class="comment"> **********************************************************************/</span></div><div class="line"><a name="l00018"></a><span class="lineno"> 18</span>&#160;</div><div class="line"><a name="l00019"></a><span class="lineno"> 19</span>&#160;<span class="preprocessor">#ifndef GEOS_NODING_SEGMENTPOINTCOMPARATOR_H</span></div><div class="line"><a name="l00020"></a><span class="lineno"> 20</span>&#160;<span class="preprocessor">#define GEOS_NODING_SEGMENTPOINTCOMPARATOR_H</span></div><div class="line"><a name="l00021"></a><span class="lineno"> 21</span>&#160;</div><div class="line"><a name="l00022"></a><span class="lineno"> 22</span>&#160;<span class="preprocessor">#include &lt;<a class="code" href="export_8h.html">geos/export.h</a>&gt;</span></div><div class="line"><a name="l00023"></a><span class="lineno"> 23</span>&#160;<span class="preprocessor">#include &lt;<a class="code" href="Coordinate_8h.html">geos/geom/Coordinate.h</a>&gt;</span></div><div class="line"><a name="l00024"></a><span class="lineno"> 24</span>&#160;<span class="preprocessor">#include &lt;cassert&gt;</span></div><div class="line"><a name="l00025"></a><span class="lineno"> 25</span>&#160;</div><div class="line"><a name="l00026"></a><span class="lineno"> 26</span>&#160;<span class="keyword">namespace </span><a class="code" href="namespacegeos.html">geos</a> {</div><div class="line"><a name="l00027"></a><span class="lineno"> 27</span>&#160;<span class="keyword">namespace </span>noding { <span class="comment">// geos.noding</span></div><div class="line"><a name="l00028"></a><span class="lineno"> 28</span>&#160;</div><div class="line"><a name="l00040"></a><span class="lineno"><a class="line" href="classgeos_1_1noding_1_1SegmentPointComparator.html"> 40</a></span>&#160;<span class="keyword">class </span><a class="code" href="export_8h.html#ae36df939090171f6e9a28a8cb6254fea">GEOS_DLL</a> <a class="code" href="classgeos_1_1noding_1_1SegmentPointComparator.html">SegmentPointComparator</a> {</div><div class="line"><a name="l00041"></a><span class="lineno"> 41</span>&#160;</div><div class="line"><a name="l00042"></a><span class="lineno"> 42</span>&#160;<span class="keyword">public</span>:</div><div class="line"><a name="l00043"></a><span class="lineno"> 43</span>&#160;</div><div class="line"><a name="l00052"></a><span class="lineno"> 52</span>&#160; <span class="keyword">static</span> <span class="keywordtype">int</span></div><div class="line"><a name="l00053"></a><span class="lineno"><a class="line" href="classgeos_1_1noding_1_1SegmentPointComparator.html#ad46e6c91ff33c9b14be08072a094ac4a"> 53</a></span>&#160; <a class="code" href="classgeos_1_1noding_1_1SegmentPointComparator.html#ad46e6c91ff33c9b14be08072a094ac4a">compare</a>(<span class="keywordtype">int</span> octant, <span class="keyword">const</span> <a class="code" href="classgeos_1_1geom_1_1Coordinate.html">geom::Coordinate</a>&amp; p0,</div><div class="line"><a name="l00054"></a><span class="lineno"> 54</span>&#160; <span class="keyword">const</span> <a class="code" href="classgeos_1_1geom_1_1Coordinate.html">geom::Coordinate</a>&amp; p1)</div><div class="line"><a name="l00055"></a><span class="lineno"> 55</span>&#160; {</div><div class="line"><a name="l00056"></a><span class="lineno"> 56</span>&#160; <span class="comment">// nodes can only be equal if their coordinates are equal</span></div><div class="line"><a name="l00057"></a><span class="lineno"> 57</span>&#160; <span class="keywordflow">if</span>(p0.<a class="code" href="classgeos_1_1geom_1_1Coordinate.html#a2c21bb7a17fd64f70d6ee55990cb87b9">equals2D</a>(p1)) {</div><div class="line"><a name="l00058"></a><span class="lineno"> 58</span>&#160; <span class="keywordflow">return</span> 0;</div><div class="line"><a name="l00059"></a><span class="lineno"> 59</span>&#160; }</div><div class="line"><a name="l00060"></a><span class="lineno"> 60</span>&#160;</div><div class="line"><a name="l00061"></a><span class="lineno"> 61</span>&#160; <span class="keywordtype">int</span> xSign = relativeSign(p0.<a class="code" href="classgeos_1_1geom_1_1Coordinate.html#ad809a77e5715e490a7e5f95c8611737e">x</a>, p1.<a class="code" href="classgeos_1_1geom_1_1Coordinate.html#ad809a77e5715e490a7e5f95c8611737e">x</a>);</div><div class="line"><a name="l00062"></a><span class="lineno"> 62</span>&#160; <span class="keywordtype">int</span> ySign = relativeSign(p0.<a class="code" href="classgeos_1_1geom_1_1Coordinate.html#acdeb58356624ebe25cbbf5b6021c3d9d">y</a>, p1.<a class="code" href="classgeos_1_1geom_1_1Coordinate.html#acdeb58356624ebe25cbbf5b6021c3d9d">y</a>);</div><div class="line"><a name="l00063"></a><span class="lineno"> 63</span>&#160;</div><div class="line"><a name="l00064"></a><span class="lineno"> 64</span>&#160; <span class="keywordflow">switch</span>(octant) {</div><div class="line"><a name="l00065"></a><span class="lineno"> 65</span>&#160; <span class="keywordflow">case</span> 0:</div><div class="line"><a name="l00066"></a><span class="lineno"> 66</span>&#160; <span class="keywordflow">return</span> compareValue(xSign, ySign);</div><div class="line"><a name="l00067"></a><span class="lineno"> 67</span>&#160; <span class="keywordflow">case</span> 1:</div><div class="line"><a name="l00068"></a><span class="lineno"> 68</span>&#160; <span class="keywordflow">return</span> compareValue(ySign, xSign);</div><div class="line"><a name="l00069"></a><span class="lineno"> 69</span>&#160; <span class="keywordflow">case</span> 2:</div><div class="line"><a name="l00070"></a><span class="lineno"> 70</span>&#160; <span class="keywordflow">return</span> compareValue(ySign, -xSign);</div><div class="line"><a name="l00071"></a><span class="lineno"> 71</span>&#160; <span class="keywordflow">case</span> 3:</div><div class="line"><a name="l00072"></a><span class="lineno"> 72</span>&#160; <span class="keywordflow">return</span> compareValue(-xSign, ySign);</div><div class="line"><a name="l00073"></a><span class="lineno"> 73</span>&#160; <span class="keywordflow">case</span> 4:</div><div class="line"><a name="l00074"></a><span class="lineno"> 74</span>&#160; <span class="keywordflow">return</span> compareValue(-xSign, -ySign);</div><div class="line"><a name="l00075"></a><span class="lineno"> 75</span>&#160; <span class="keywordflow">case</span> 5:</div><div class="line"><a name="l00076"></a><span class="lineno"> 76</span>&#160; <span class="keywordflow">return</span> compareValue(-ySign, -xSign);</div><div class="line"><a name="l00077"></a><span class="lineno"> 77</span>&#160; <span class="keywordflow">case</span> 6:</div><div class="line"><a name="l00078"></a><span class="lineno"> 78</span>&#160; <span class="keywordflow">return</span> compareValue(-ySign, xSign);</div><div class="line"><a name="l00079"></a><span class="lineno"> 79</span>&#160; <span class="keywordflow">case</span> 7:</div><div class="line"><a name="l00080"></a><span class="lineno"> 80</span>&#160; <span class="keywordflow">return</span> compareValue(xSign, -ySign);</div><div class="line"><a name="l00081"></a><span class="lineno"> 81</span>&#160; }</div><div class="line"><a name="l00082"></a><span class="lineno"> 82</span>&#160; assert(0); <span class="comment">// invalid octant value</span></div><div class="line"><a name="l00083"></a><span class="lineno"> 83</span>&#160; <span class="keywordflow">return</span> 0;</div><div class="line"><a name="l00084"></a><span class="lineno"> 84</span>&#160;</div><div class="line"><a name="l00085"></a><span class="lineno"> 85</span>&#160; }</div><div class="line"><a name="l00086"></a><span class="lineno"> 86</span>&#160;</div><div class="line"><a name="l00087"></a><span class="lineno"> 87</span>&#160; <span class="keyword">static</span> <span class="keywordtype">int</span></div><div class="line"><a name="l00088"></a><span class="lineno"><a class="line" href="classgeos_1_1noding_1_1SegmentPointComparator.html#a0dacaf6187868de20cab6b03da25a968"> 88</a></span>&#160; <a class="code" href="classgeos_1_1noding_1_1SegmentPointComparator.html#a0dacaf6187868de20cab6b03da25a968">relativeSign</a>(<span class="keywordtype">double</span> x0, <span class="keywordtype">double</span> x1)</div><div class="line"><a name="l00089"></a><span class="lineno"> 89</span>&#160; {</div><div class="line"><a name="l00090"></a><span class="lineno"> 90</span>&#160; <span class="keywordflow">if</span>(x0 &lt; x1) {</div><div class="line"><a name="l00091"></a><span class="lineno"> 91</span>&#160; <span class="keywordflow">return</span> -1;</div><div class="line"><a name="l00092"></a><span class="lineno"> 92</span>&#160; }</div><div class="line"><a name="l00093"></a><span class="lineno"> 93</span>&#160; <span class="keywordflow">if</span>(x0 &gt; x1) {</div><div class="line"><a name="l00094"></a><span class="lineno"> 94</span>&#160; <span class="keywordflow">return</span> 1;</div><div class="line"><a name="l00095"></a><span class="lineno"> 95</span>&#160; }</div><div class="line"><a name="l00096"></a><span class="lineno"> 96</span>&#160; <span class="keywordflow">return</span> 0;</div><div class="line"><a name="l00097"></a><span class="lineno"> 97</span>&#160; }</div><div class="line"><a name="l00098"></a><span class="lineno"> 98</span>&#160;</div><div class="line"><a name="l00099"></a><span class="lineno"> 99</span>&#160; <span class="keyword">static</span> <span class="keywordtype">int</span></div><div class="line"><a name="l00100"></a><span class="lineno"><a class="line" href="classgeos_1_1noding_1_1SegmentPointComparator.html#afad72511ac465cacf690bd6398629f3c"> 100</a></span>&#160; <a class="code" href="classgeos_1_1noding_1_1SegmentPointComparator.html#afad72511ac465cacf690bd6398629f3c">compareValue</a>(<span class="keywordtype">int</span> compareSign0, <span class="keywordtype">int</span> compareSign1)</div><div class="line"><a name="l00101"></a><span class="lineno"> 101</span>&#160; {</div><div class="line"><a name="l00102"></a><span class="lineno"> 102</span>&#160; <span class="keywordflow">if</span>(compareSign0 &lt; 0) {</div><div class="line"><a name="l00103"></a><span class="lineno"> 103</span>&#160; <span class="keywordflow">return</span> -1;</div><div class="line"><a name="l00104"></a><span class="lineno"> 104</span>&#160; }</div><div class="line"><a name="l00105"></a><span class="lineno"> 105</span>&#160; <span class="keywordflow">if</span>(compareSign0 &gt; 0) {</div><div class="line"><a name="l00106"></a><span class="lineno"> 106</span>&#160; <span class="keywordflow">return</span> 1;</div><div class="line"><a name="l00107"></a><span class="lineno"> 107</span>&#160; }</div><div class="line"><a name="l00108"></a><span class="lineno"> 108</span>&#160; <span class="keywordflow">if</span>(compareSign1 &lt; 0) {</div><div class="line"><a name="l00109"></a><span class="lineno"> 109</span>&#160; <span class="keywordflow">return</span> -1;</div><div class="line"><a name="l00110"></a><span class="lineno"> 110</span>&#160; }</div><div class="line"><a name="l00111"></a><span class="lineno"> 111</span>&#160; <span class="keywordflow">if</span>(compareSign1 &gt; 0) {</div><div class="line"><a name="l00112"></a><span class="lineno"> 112</span>&#160; <span class="keywordflow">return</span> 1;</div><div class="line"><a name="l00113"></a><span class="lineno"> 113</span>&#160; }</div><div class="line"><a name="l00114"></a><span class="lineno"> 114</span>&#160; <span class="keywordflow">return</span> 0;</div><div class="line"><a name="l00115"></a><span class="lineno"> 115</span>&#160; }</div><div class="line"><a name="l00116"></a><span class="lineno"> 116</span>&#160;</div><div class="line"><a name="l00117"></a><span class="lineno"> 117</span>&#160;};</div><div class="line"><a name="l00118"></a><span class="lineno"> 118</span>&#160;</div><div class="line"><a name="l00119"></a><span class="lineno"> 119</span>&#160;} <span class="comment">// namespace geos.noding</span></div><div class="line"><a name="l00120"></a><span class="lineno"> 120</span>&#160;} <span class="comment">// namespace geos</span></div><div class="line"><a name="l00121"></a><span class="lineno"> 121</span>&#160;</div><div class="line"><a name="l00122"></a><span class="lineno"> 122</span>&#160;<span class="preprocessor">#endif // GEOS_NODING_SEGMENTPOINTCOMPARATOR_H</span></div><div class="ttc" id="export_8h_html_ae36df939090171f6e9a28a8cb6254fea"><div class="ttname"><a href="export_8h.html#ae36df939090171f6e9a28a8cb6254fea">GEOS_DLL</a></div><div class="ttdeci">#define GEOS_DLL</div><div class="ttdef"><b>Definition:</b> <a href="export_8h_source.html#l00028">export.h:28</a></div></div>
<div class="ttc" id="classgeos_1_1geom_1_1Coordinate_html_acdeb58356624ebe25cbbf5b6021c3d9d"><div class="ttname"><a href="classgeos_1_1geom_1_1Coordinate.html#acdeb58356624ebe25cbbf5b6021c3d9d">geos::geom::Coordinate::y</a></div><div class="ttdeci">double y</div><div class="ttdoc">y-coordinate </div><div class="ttdef"><b>Definition:</b> <a href="Coordinate_8h_source.html#l00083">Coordinate.h:83</a></div></div>
<div class="ttc" id="classgeos_1_1noding_1_1SegmentPointComparator_html_ad46e6c91ff33c9b14be08072a094ac4a"><div class="ttname"><a href="classgeos_1_1noding_1_1SegmentPointComparator.html#ad46e6c91ff33c9b14be08072a094ac4a">geos::noding::SegmentPointComparator::compare</a></div><div class="ttdeci">static int compare(int octant, const geom::Coordinate &amp;p0, const geom::Coordinate &amp;p1)</div><div class="ttdoc">Compares two Coordinates for their relative position along a segment lying in the specified Octant...</div><div class="ttdef"><b>Definition:</b> <a href="SegmentPointComparator_8h_source.html#l00053">SegmentPointComparator.h:53</a></div></div>
<div class="ttc" id="classgeos_1_1geom_1_1Coordinate_html"><div class="ttname"><a href="classgeos_1_1geom_1_1Coordinate.html">geos::geom::Coordinate</a></div><div class="ttdoc">Coordinate is the lightweight class used to store coordinates. </div><div class="ttdef"><b>Definition:</b> <a href="Coordinate_8h_source.html#l00060">Coordinate.h:60</a></div></div>
<div class="ttc" id="export_8h_html"><div class="ttname"><a href="export_8h.html">export.h</a></div></div>
<div class="ttc" id="namespacegeos_html"><div class="ttname"><a href="namespacegeos.html">geos</a></div><div class="ttdoc">Basic namespace for all GEOS functionalities. </div><div class="ttdef"><b>Definition:</b> <a href="IndexedNestedRingTester_8h_source.html#l00026">IndexedNestedRingTester.h:26</a></div></div>
<div class="ttc" id="classgeos_1_1noding_1_1SegmentPointComparator_html_a0dacaf6187868de20cab6b03da25a968"><div class="ttname"><a href="classgeos_1_1noding_1_1SegmentPointComparator.html#a0dacaf6187868de20cab6b03da25a968">geos::noding::SegmentPointComparator::relativeSign</a></div><div class="ttdeci">static int relativeSign(double x0, double x1)</div><div class="ttdef"><b>Definition:</b> <a href="SegmentPointComparator_8h_source.html#l00088">SegmentPointComparator.h:88</a></div></div>
<div class="ttc" id="Coordinate_8h_html"><div class="ttname"><a href="Coordinate_8h.html">Coordinate.h</a></div></div>
<div class="ttc" id="classgeos_1_1geom_1_1Coordinate_html_ad809a77e5715e490a7e5f95c8611737e"><div class="ttname"><a href="classgeos_1_1geom_1_1Coordinate.html#ad809a77e5715e490a7e5f95c8611737e">geos::geom::Coordinate::x</a></div><div class="ttdeci">double x</div><div class="ttdoc">x-coordinate </div><div class="ttdef"><b>Definition:</b> <a href="Coordinate_8h_source.html#l00080">Coordinate.h:80</a></div></div>
<div class="ttc" id="classgeos_1_1geom_1_1Coordinate_html_a2c21bb7a17fd64f70d6ee55990cb87b9"><div class="ttname"><a href="classgeos_1_1geom_1_1Coordinate.html#a2c21bb7a17fd64f70d6ee55990cb87b9">geos::geom::Coordinate::equals2D</a></div><div class="ttdeci">bool equals2D(const Coordinate &amp;other) const </div></div>
<div class="ttc" id="classgeos_1_1noding_1_1SegmentPointComparator_html"><div class="ttname"><a href="classgeos_1_1noding_1_1SegmentPointComparator.html">geos::noding::SegmentPointComparator</a></div><div class="ttdoc">Implements a robust method of comparing the relative position of two points along the same segment...</div><div class="ttdef"><b>Definition:</b> <a href="SegmentPointComparator_8h_source.html#l00040">SegmentPointComparator.h:40</a></div></div>
<div class="ttc" id="classgeos_1_1noding_1_1SegmentPointComparator_html_afad72511ac465cacf690bd6398629f3c"><div class="ttname"><a href="classgeos_1_1noding_1_1SegmentPointComparator.html#afad72511ac465cacf690bd6398629f3c">geos::noding::SegmentPointComparator::compareValue</a></div><div class="ttdeci">static int compareValue(int compareSign0, int compareSign1)</div><div class="ttdef"><b>Definition:</b> <a href="SegmentPointComparator_8h_source.html#l00100">SegmentPointComparator.h:100</a></div></div>
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