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<a href="#pub-methods">Public Member Functions</a> &#124;
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<div class="headertitle"><div class="title">SegmentIntersection Struct Reference</div></div>
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a id="pub-methods" name="pub-methods"></a>
Public Member Functions</h2></td></tr>
<tr class="memitem:aefd077282f45bd16799b53f8aa430ffd" id="r_aefd077282f45bd16799b53f8aa430ffd"><td class="memItemLeft" align="right" valign="top">bool&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="#aefd077282f45bd16799b53f8aa430ffd">intersect</a> (<a class="el" href="../../d8/dc8/struct_point.html">Point</a> first_point, <a class="el" href="../../d8/dc8/struct_point.html">Point</a> second_point, <a class="el" href="../../d8/dc8/struct_point.html">Point</a> third_point, <a class="el" href="../../d8/dc8/struct_point.html">Point</a> forth_point)</td></tr>
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<tr class="memitem:a008941b2272866c64cdaf959afa939bf" id="r_a008941b2272866c64cdaf959afa939bf"><td class="memItemLeft" align="right" valign="top">bool&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="#a008941b2272866c64cdaf959afa939bf">on_segment</a> (<a class="el" href="../../d8/dc8/struct_point.html">Point</a> first_point, <a class="el" href="../../d8/dc8/struct_point.html">Point</a> second_point, <a class="el" href="../../d8/dc8/struct_point.html">Point</a> third_point)</td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><p>intersect returns true if segments of two line intersects and false if they do not. It calls the subroutines direction which computes the orientation. </p>
<p class="definition">Definition at line <a class="el" href="../../d8/d6c/line__segment__intersection_8cpp_source.html#l00022">22</a> of file <a class="el" href="../../d8/d6c/line__segment__intersection_8cpp_source.html">line_segment_intersection.cpp</a>.</p>
</div><h2 class="groupheader">Member Function Documentation</h2>
<a id="a3beb2ac1b35d67354f1dbaf9a971e655" name="a3beb2ac1b35d67354f1dbaf9a971e655"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a3beb2ac1b35d67354f1dbaf9a971e655">&#9670;&#160;</a></span>direction()</h2>
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<td class="memname">int SegmentIntersection::direction </td>
<td>(</td>
<td class="paramtype"><a class="el" href="../../d8/dc8/struct_point.html">Point</a></td> <td class="paramname"><span class="paramname"><em>first_point</em></span>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="../../d8/dc8/struct_point.html">Point</a></td> <td class="paramname"><span class="paramname"><em>second_point</em></span>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="../../d8/dc8/struct_point.html">Point</a></td> <td class="paramname"><span class="paramname"><em>third_point</em></span>&#160;)</td>
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<p>We will find direction of line here respect to @first_point. Here @second_point and @third_point is first and second points of the line respectively. we want a method to determine which way a given angle these three points turns. If returned number is negative, then the angle is counter-clockwise. That means the line is going to right to left. We will fount angle as clockwise if the method returns positive number. </p>
<p class="definition">Definition at line <a class="el" href="../../d8/d6c/line__segment__intersection_8cpp_source.html#l00063">63</a> of file <a class="el" href="../../d8/d6c/line__segment__intersection_8cpp_source.html">line_segment_intersection.cpp</a>.</p>
<div class="fragment"><div class="line"><span class="lineno"> 64</span> {</div>
<div class="line"><span class="lineno"> 65</span> <span class="keywordflow">return</span> ((third_point.x - first_point.x) *</div>
<div class="line"><span class="lineno"> 66</span> (second_point.<a class="code hl_variable" href="../../d8/dc8/struct_point.html#a2e1b5fb2b2a83571f5c0bc0f66a73cf7">y</a> - first_point.<a class="code hl_variable" href="../../d8/dc8/struct_point.html#a2e1b5fb2b2a83571f5c0bc0f66a73cf7">y</a>)) -</div>
<div class="line"><span class="lineno"> 67</span> ((second_point.x - first_point.x) *</div>
<div class="line"><span class="lineno"> 68</span> (third_point.<a class="code hl_variable" href="../../d8/dc8/struct_point.html#a2e1b5fb2b2a83571f5c0bc0f66a73cf7">y</a> - first_point.<a class="code hl_variable" href="../../d8/dc8/struct_point.html#a2e1b5fb2b2a83571f5c0bc0f66a73cf7">y</a>));</div>
<div class="line"><span class="lineno"> 69</span> }</div>
<div class="ttc" id="astruct_point_html_a2e1b5fb2b2a83571f5c0bc0f66a73cf7"><div class="ttname"><a href="../../d8/dc8/struct_point.html#a2e1b5fb2b2a83571f5c0bc0f66a73cf7">Point::y</a></div><div class="ttdeci">int y</div><div class="ttdoc">Point respect to x coordinate.</div><div class="ttdef"><b>Definition</b> <a href="../../d8/d6c/line__segment__intersection_8cpp_source.html#l00014">line_segment_intersection.cpp:14</a></div></div>
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<a id="aefd077282f45bd16799b53f8aa430ffd" name="aefd077282f45bd16799b53f8aa430ffd"></a>
<h2 class="memtitle"><span class="permalink"><a href="#aefd077282f45bd16799b53f8aa430ffd">&#9670;&#160;</a></span>intersect()</h2>
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<td class="memname">bool SegmentIntersection::intersect </td>
<td>(</td>
<td class="paramtype"><a class="el" href="../../d8/dc8/struct_point.html">Point</a></td> <td class="paramname"><span class="paramname"><em>first_point</em></span>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="../../d8/dc8/struct_point.html">Point</a></td> <td class="paramname"><span class="paramname"><em>second_point</em></span>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="../../d8/dc8/struct_point.html">Point</a></td> <td class="paramname"><span class="paramname"><em>third_point</em></span>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="../../d8/dc8/struct_point.html">Point</a></td> <td class="paramname"><span class="paramname"><em>forth_point</em></span>&#160;)</td>
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<p class="definition">Definition at line <a class="el" href="../../d8/d6c/line__segment__intersection_8cpp_source.html#l00023">23</a> of file <a class="el" href="../../d8/d6c/line__segment__intersection_8cpp_source.html">line_segment_intersection.cpp</a>.</p>
<div class="fragment"><div class="line"><span class="lineno"> 24</span> {</div>
<div class="line"><span class="lineno"> 25</span> <span class="keywordtype">int</span> direction1 = <a class="code hl_function" href="#a3beb2ac1b35d67354f1dbaf9a971e655">direction</a>(third_point, forth_point, first_point);</div>
<div class="line"><span class="lineno"> 26</span> <span class="keywordtype">int</span> direction2 = <a class="code hl_function" href="#a3beb2ac1b35d67354f1dbaf9a971e655">direction</a>(third_point, forth_point, second_point);</div>
<div class="line"><span class="lineno"> 27</span> <span class="keywordtype">int</span> direction3 = <a class="code hl_function" href="#a3beb2ac1b35d67354f1dbaf9a971e655">direction</a>(first_point, second_point, third_point);</div>
<div class="line"><span class="lineno"> 28</span> <span class="keywordtype">int</span> direction4 = <a class="code hl_function" href="#a3beb2ac1b35d67354f1dbaf9a971e655">direction</a>(first_point, second_point, forth_point);</div>
<div class="line"><span class="lineno"> 29</span> </div>
<div class="line"><span class="lineno"> 30</span> <span class="keywordflow">if</span> ((direction1 &lt; 0 || direction2 &gt; 0) &amp;&amp;</div>
<div class="line"><span class="lineno"> 31</span> (direction3 &lt; 0 || direction4 &gt; 0))</div>
<div class="line"><span class="lineno"> 32</span> <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
<div class="line"><span class="lineno"> 33</span> </div>
<div class="line"><span class="lineno"> 34</span> <span class="keywordflow">else</span> <span class="keywordflow">if</span> (direction1 == 0 &amp;&amp;</div>
<div class="line"><span class="lineno"> 35</span> <a class="code hl_function" href="#a008941b2272866c64cdaf959afa939bf">on_segment</a>(third_point, forth_point, first_point))</div>
<div class="line"><span class="lineno"> 36</span> <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
<div class="line"><span class="lineno"> 37</span> </div>
<div class="line"><span class="lineno"> 38</span> <span class="keywordflow">else</span> <span class="keywordflow">if</span> (direction2 == 0 &amp;&amp;</div>
<div class="line"><span class="lineno"> 39</span> <a class="code hl_function" href="#a008941b2272866c64cdaf959afa939bf">on_segment</a>(third_point, forth_point, second_point))</div>
<div class="line"><span class="lineno"> 40</span> <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
<div class="line"><span class="lineno"> 41</span> </div>
<div class="line"><span class="lineno"> 42</span> <span class="keywordflow">else</span> <span class="keywordflow">if</span> (direction3 == 0 &amp;&amp;</div>
<div class="line"><span class="lineno"> 43</span> <a class="code hl_function" href="#a008941b2272866c64cdaf959afa939bf">on_segment</a>(first_point, second_point, third_point))</div>
<div class="line"><span class="lineno"> 44</span> <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
<div class="line"><span class="lineno"> 45</span> </div>
<div class="line"><span class="lineno"> 46</span> <span class="keywordflow">else</span> <span class="keywordflow">if</span> (direction3 == 0 &amp;&amp;</div>
<div class="line"><span class="lineno"> 47</span> <a class="code hl_function" href="#a008941b2272866c64cdaf959afa939bf">on_segment</a>(first_point, second_point, forth_point))</div>
<div class="line"><span class="lineno"> 48</span> <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
<div class="line"><span class="lineno"> 49</span> </div>
<div class="line"><span class="lineno"> 50</span> <span class="keywordflow">else</span></div>
<div class="line"><span class="lineno"> 51</span> <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
<div class="line"><span class="lineno"> 52</span> }</div>
<div class="ttc" id="astruct_segment_intersection_html_a008941b2272866c64cdaf959afa939bf"><div class="ttname"><a href="#a008941b2272866c64cdaf959afa939bf">SegmentIntersection::on_segment</a></div><div class="ttdeci">bool on_segment(Point first_point, Point second_point, Point third_point)</div><div class="ttdef"><b>Definition</b> <a href="../../d8/d6c/line__segment__intersection_8cpp_source.html#l00075">line_segment_intersection.cpp:75</a></div></div>
<div class="ttc" id="astruct_segment_intersection_html_a3beb2ac1b35d67354f1dbaf9a971e655"><div class="ttname"><a href="#a3beb2ac1b35d67354f1dbaf9a971e655">SegmentIntersection::direction</a></div><div class="ttdeci">int direction(Point first_point, Point second_point, Point third_point)</div><div class="ttdef"><b>Definition</b> <a href="../../d8/d6c/line__segment__intersection_8cpp_source.html#l00063">line_segment_intersection.cpp:63</a></div></div>
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<h2 class="memtitle"><span class="permalink"><a href="#a008941b2272866c64cdaf959afa939bf">&#9670;&#160;</a></span>on_segment()</h2>
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<td class="memname">bool SegmentIntersection::on_segment </td>
<td>(</td>
<td class="paramtype"><a class="el" href="../../d8/dc8/struct_point.html">Point</a></td> <td class="paramname"><span class="paramname"><em>first_point</em></span>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="../../d8/dc8/struct_point.html">Point</a></td> <td class="paramname"><span class="paramname"><em>second_point</em></span>, </td>
</tr>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="../../d8/dc8/struct_point.html">Point</a></td> <td class="paramname"><span class="paramname"><em>third_point</em></span>&#160;)</td>
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<p>This method determines whether a point known to be colinear with a segment lies on that segment. </p>
<p class="definition">Definition at line <a class="el" href="../../d8/d6c/line__segment__intersection_8cpp_source.html#l00075">75</a> of file <a class="el" href="../../d8/d6c/line__segment__intersection_8cpp_source.html">line_segment_intersection.cpp</a>.</p>
<div class="fragment"><div class="line"><span class="lineno"> 76</span> {</div>
<div class="line"><span class="lineno"> 77</span> <span class="keywordflow">if</span> (std::min(first_point.x, second_point.x) &lt;= third_point.x &amp;&amp;</div>
<div class="line"><span class="lineno"> 78</span> third_point.x &lt;= std::max(first_point.x, second_point.x) &amp;&amp;</div>
<div class="line"><span class="lineno"> 79</span> std::min(first_point.<a class="code hl_variable" href="../../d8/dc8/struct_point.html#a2e1b5fb2b2a83571f5c0bc0f66a73cf7">y</a>, second_point.<a class="code hl_variable" href="../../d8/dc8/struct_point.html#a2e1b5fb2b2a83571f5c0bc0f66a73cf7">y</a>) &lt;= third_point.<a class="code hl_variable" href="../../d8/dc8/struct_point.html#a2e1b5fb2b2a83571f5c0bc0f66a73cf7">y</a> &amp;&amp;</div>
<div class="line"><span class="lineno"> 80</span> third_point.<a class="code hl_variable" href="../../d8/dc8/struct_point.html#a2e1b5fb2b2a83571f5c0bc0f66a73cf7">y</a> &lt;= std::max(first_point.<a class="code hl_variable" href="../../d8/dc8/struct_point.html#a2e1b5fb2b2a83571f5c0bc0f66a73cf7">y</a>, second_point.<a class="code hl_variable" href="../../d8/dc8/struct_point.html#a2e1b5fb2b2a83571f5c0bc0f66a73cf7">y</a>))</div>
<div class="line"><span class="lineno"> 81</span> <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
<div class="line"><span class="lineno"> 82</span> </div>
<div class="line"><span class="lineno"> 83</span> <span class="keywordflow">else</span></div>
<div class="line"><span class="lineno"> 84</span> <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
<div class="line"><span class="lineno"> 85</span> }</div>
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<hr/>The documentation for this struct was generated from the following file:<ul>
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