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<div class="headertitle"><div class="title">line_segment_intersection.cpp</div></div>
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<div class="contents">
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<a href="../../d8/d6c/line__segment__intersection_8cpp.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a id="l00001" name="l00001"></a><span class="lineno"> 1</span></div>
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<div class="line"><a id="l00006" name="l00006"></a><span class="lineno"> 6</span><span class="preprocessor">#include <algorithm></span></div>
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<div class="line"><a id="l00007" name="l00007"></a><span class="lineno"> 7</span><span class="preprocessor">#include <iostream></span></div>
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<div class="line"><a id="l00008" name="l00008"></a><span class="lineno"> 8</span></div>
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<div class="foldopen" id="foldopen00012" data-start="{" data-end="};">
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<div class="line"><a id="l00012" name="l00012"></a><span class="lineno"><a class="line" href="../../d8/dc8/struct_point.html"> 12</a></span><span class="keyword">struct </span><a class="code hl_function" href="../../d8/dc8/struct_point.html#ae2d6fb1b3fd3a96169d963d62e37130a">Point</a> {</div>
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<div class="line"><a id="l00013" name="l00013"></a><span class="lineno"> 13</span> <span class="keywordtype">int</span> x; </div>
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<div class="line"><a id="l00014" name="l00014"></a><span class="lineno"><a class="line" href="../../d8/dc8/struct_point.html#a2e1b5fb2b2a83571f5c0bc0f66a73cf7"> 14</a></span> <span class="keywordtype">int</span> <a class="code hl_variable" href="../../d8/dc8/struct_point.html#a2e1b5fb2b2a83571f5c0bc0f66a73cf7">y</a>; </div>
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<div class="line"><a id="l00015" name="l00015"></a><span class="lineno"> 15</span>};</div>
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</div>
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<div class="line"><a id="l00016" name="l00016"></a><span class="lineno"> 16</span></div>
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<div class="foldopen" id="foldopen00022" data-start="{" data-end="};">
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<div class="line"><a id="l00022" name="l00022"></a><span class="lineno"><a class="line" href="../../d4/db4/struct_segment_intersection.html"> 22</a></span><span class="keyword">struct </span><a class="code hl_struct" href="../../d4/db4/struct_segment_intersection.html">SegmentIntersection</a> {</div>
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<div class="line"><a id="l00023" name="l00023"></a><span class="lineno"> 23</span> <span class="keyword">inline</span> <span class="keywordtype">bool</span> intersect(<a class="code hl_struct" href="../../d8/dc8/struct_point.html">Point</a> first_point, <a class="code hl_struct" href="../../d8/dc8/struct_point.html">Point</a> second_point,</div>
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<div class="line"><a id="l00024" name="l00024"></a><span class="lineno"> 24</span> <a class="code hl_struct" href="../../d8/dc8/struct_point.html">Point</a> third_point, <a class="code hl_struct" href="../../d8/dc8/struct_point.html">Point</a> forth_point) {</div>
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<div class="line"><a id="l00025" name="l00025"></a><span class="lineno"> 25</span> <span class="keywordtype">int</span> direction1 = <a class="code hl_function" href="../../d4/db4/struct_segment_intersection.html#a3beb2ac1b35d67354f1dbaf9a971e655">direction</a>(third_point, forth_point, first_point);</div>
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<div class="line"><a id="l00026" name="l00026"></a><span class="lineno"> 26</span> <span class="keywordtype">int</span> direction2 = <a class="code hl_function" href="../../d4/db4/struct_segment_intersection.html#a3beb2ac1b35d67354f1dbaf9a971e655">direction</a>(third_point, forth_point, second_point);</div>
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<div class="line"><a id="l00027" name="l00027"></a><span class="lineno"> 27</span> <span class="keywordtype">int</span> direction3 = <a class="code hl_function" href="../../d4/db4/struct_segment_intersection.html#a3beb2ac1b35d67354f1dbaf9a971e655">direction</a>(first_point, second_point, third_point);</div>
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<div class="line"><a id="l00028" name="l00028"></a><span class="lineno"> 28</span> <span class="keywordtype">int</span> direction4 = <a class="code hl_function" href="../../d4/db4/struct_segment_intersection.html#a3beb2ac1b35d67354f1dbaf9a971e655">direction</a>(first_point, second_point, forth_point);</div>
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<div class="line"><a id="l00029" name="l00029"></a><span class="lineno"> 29</span> </div>
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<div class="line"><a id="l00030" name="l00030"></a><span class="lineno"> 30</span> <span class="keywordflow">if</span> ((direction1 < 0 || direction2 > 0) &&</div>
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<div class="line"><a id="l00031" name="l00031"></a><span class="lineno"> 31</span> (direction3 < 0 || direction4 > 0))</div>
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<div class="line"><a id="l00032" name="l00032"></a><span class="lineno"> 32</span> <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
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<div class="line"><a id="l00033" name="l00033"></a><span class="lineno"> 33</span> </div>
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<div class="line"><a id="l00034" name="l00034"></a><span class="lineno"> 34</span> <span class="keywordflow">else</span> <span class="keywordflow">if</span> (direction1 == 0 &&</div>
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<div class="line"><a id="l00035" name="l00035"></a><span class="lineno"> 35</span> <a class="code hl_function" href="../../d4/db4/struct_segment_intersection.html#a008941b2272866c64cdaf959afa939bf">on_segment</a>(third_point, forth_point, first_point))</div>
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<div class="line"><a id="l00036" name="l00036"></a><span class="lineno"> 36</span> <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
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<div class="line"><a id="l00037" name="l00037"></a><span class="lineno"> 37</span> </div>
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<div class="line"><a id="l00038" name="l00038"></a><span class="lineno"> 38</span> <span class="keywordflow">else</span> <span class="keywordflow">if</span> (direction2 == 0 &&</div>
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<div class="line"><a id="l00039" name="l00039"></a><span class="lineno"> 39</span> <a class="code hl_function" href="../../d4/db4/struct_segment_intersection.html#a008941b2272866c64cdaf959afa939bf">on_segment</a>(third_point, forth_point, second_point))</div>
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<div class="line"><a id="l00040" name="l00040"></a><span class="lineno"> 40</span> <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
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<div class="line"><a id="l00041" name="l00041"></a><span class="lineno"> 41</span> </div>
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<div class="line"><a id="l00042" name="l00042"></a><span class="lineno"> 42</span> <span class="keywordflow">else</span> <span class="keywordflow">if</span> (direction3 == 0 &&</div>
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<div class="line"><a id="l00043" name="l00043"></a><span class="lineno"> 43</span> <a class="code hl_function" href="../../d4/db4/struct_segment_intersection.html#a008941b2272866c64cdaf959afa939bf">on_segment</a>(first_point, second_point, third_point))</div>
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<div class="line"><a id="l00044" name="l00044"></a><span class="lineno"> 44</span> <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
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<div class="line"><a id="l00045" name="l00045"></a><span class="lineno"> 45</span> </div>
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<div class="line"><a id="l00046" name="l00046"></a><span class="lineno"> 46</span> <span class="keywordflow">else</span> <span class="keywordflow">if</span> (direction3 == 0 &&</div>
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<div class="line"><a id="l00047" name="l00047"></a><span class="lineno"> 47</span> <a class="code hl_function" href="../../d4/db4/struct_segment_intersection.html#a008941b2272866c64cdaf959afa939bf">on_segment</a>(first_point, second_point, forth_point))</div>
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<div class="line"><a id="l00048" name="l00048"></a><span class="lineno"> 48</span> <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
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<div class="line"><a id="l00049" name="l00049"></a><span class="lineno"> 49</span> </div>
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<div class="line"><a id="l00050" name="l00050"></a><span class="lineno"> 50</span> <span class="keywordflow">else</span></div>
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<div class="line"><a id="l00051" name="l00051"></a><span class="lineno"> 51</span> <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
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<div class="line"><a id="l00052" name="l00052"></a><span class="lineno"> 52</span> }</div>
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<div class="line"><a id="l00053" name="l00053"></a><span class="lineno"> 53</span></div>
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<div class="foldopen" id="foldopen00063" data-start="{" data-end="}">
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<div class="line"><a id="l00063" name="l00063"></a><span class="lineno"><a class="line" href="../../d4/db4/struct_segment_intersection.html#a3beb2ac1b35d67354f1dbaf9a971e655"> 63</a></span> <span class="keyword">inline</span> <span class="keywordtype">int</span> <a class="code hl_function" href="../../d4/db4/struct_segment_intersection.html#a3beb2ac1b35d67354f1dbaf9a971e655">direction</a>(<a class="code hl_struct" href="../../d8/dc8/struct_point.html">Point</a> first_point, <a class="code hl_struct" href="../../d8/dc8/struct_point.html">Point</a> second_point,</div>
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<div class="line"><a id="l00064" name="l00064"></a><span class="lineno"> 64</span> <a class="code hl_struct" href="../../d8/dc8/struct_point.html">Point</a> third_point) {</div>
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<div class="line"><a id="l00065" name="l00065"></a><span class="lineno"> 65</span> <span class="keywordflow">return</span> ((third_point.x - first_point.x) *</div>
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<div class="line"><a id="l00066" name="l00066"></a><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>
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<div class="line"><a id="l00067" name="l00067"></a><span class="lineno"> 67</span> ((second_point.x - first_point.x) *</div>
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<div class="line"><a id="l00068" name="l00068"></a><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>
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<div class="line"><a id="l00069" name="l00069"></a><span class="lineno"> 69</span> }</div>
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</div>
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<div class="line"><a id="l00070" name="l00070"></a><span class="lineno"> 70</span></div>
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<div class="foldopen" id="foldopen00075" data-start="{" data-end="}">
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<div class="line"><a id="l00075" name="l00075"></a><span class="lineno"><a class="line" href="../../d4/db4/struct_segment_intersection.html#a008941b2272866c64cdaf959afa939bf"> 75</a></span> <span class="keyword">inline</span> <span class="keywordtype">bool</span> <a class="code hl_function" href="../../d4/db4/struct_segment_intersection.html#a008941b2272866c64cdaf959afa939bf">on_segment</a>(<a class="code hl_struct" href="../../d8/dc8/struct_point.html">Point</a> first_point, <a class="code hl_struct" href="../../d8/dc8/struct_point.html">Point</a> second_point,</div>
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<div class="line"><a id="l00076" name="l00076"></a><span class="lineno"> 76</span> <a class="code hl_struct" href="../../d8/dc8/struct_point.html">Point</a> third_point) {</div>
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<div class="line"><a id="l00077" name="l00077"></a><span class="lineno"> 77</span> <span class="keywordflow">if</span> (std::min(first_point.x, second_point.x) <= third_point.x &&</div>
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<div class="line"><a id="l00078" name="l00078"></a><span class="lineno"> 78</span> third_point.x <= std::max(first_point.x, second_point.x) &&</div>
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<div class="line"><a id="l00079" name="l00079"></a><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>) <= third_point.<a class="code hl_variable" href="../../d8/dc8/struct_point.html#a2e1b5fb2b2a83571f5c0bc0f66a73cf7">y</a> &&</div>
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<div class="line"><a id="l00080" name="l00080"></a><span class="lineno"> 80</span> third_point.<a class="code hl_variable" href="../../d8/dc8/struct_point.html#a2e1b5fb2b2a83571f5c0bc0f66a73cf7">y</a> <= 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>
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<div class="line"><a id="l00081" name="l00081"></a><span class="lineno"> 81</span> <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
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<div class="line"><a id="l00082" name="l00082"></a><span class="lineno"> 82</span> </div>
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<div class="line"><a id="l00083" name="l00083"></a><span class="lineno"> 83</span> <span class="keywordflow">else</span></div>
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<div class="line"><a id="l00084" name="l00084"></a><span class="lineno"> 84</span> <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
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<div class="line"><a id="l00085" name="l00085"></a><span class="lineno"> 85</span> }</div>
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</div>
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<div class="line"><a id="l00086" name="l00086"></a><span class="lineno"> 86</span>};</div>
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</div>
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<div class="line"><a id="l00087" name="l00087"></a><span class="lineno"> 87</span></div>
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<div class="foldopen" id="foldopen00092" data-start="{" data-end="}">
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<div class="line"><a id="l00092" name="l00092"></a><span class="lineno"><a class="line" href="../../d8/d6c/line__segment__intersection_8cpp.html#ae66f6b31b5ad750f1fe042a706a4e3d4"> 92</a></span><span class="keywordtype">int</span> <a class="code hl_function" href="../../d8/d6c/line__segment__intersection_8cpp.html#ae66f6b31b5ad750f1fe042a706a4e3d4">main</a>() {</div>
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<div class="line"><a id="l00093" name="l00093"></a><span class="lineno"> 93</span> <a class="code hl_struct" href="../../d4/db4/struct_segment_intersection.html">SegmentIntersection</a> segment;</div>
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<div class="line"><a id="l00094" name="l00094"></a><span class="lineno"> 94</span> <a class="code hl_struct" href="../../d8/dc8/struct_point.html">Point</a> first_point, second_point, third_point, forth_point;</div>
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<div class="line"><a id="l00095" name="l00095"></a><span class="lineno"> 95</span> </div>
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<div class="line"><a id="l00096" name="l00096"></a><span class="lineno"> 96</span> std::cin >> first_point.x >> first_point.<a class="code hl_variable" href="../../d8/dc8/struct_point.html#a2e1b5fb2b2a83571f5c0bc0f66a73cf7">y</a>;</div>
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<div class="line"><a id="l00097" name="l00097"></a><span class="lineno"> 97</span> std::cin >> second_point.x >> second_point.<a class="code hl_variable" href="../../d8/dc8/struct_point.html#a2e1b5fb2b2a83571f5c0bc0f66a73cf7">y</a>;</div>
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<div class="line"><a id="l00098" name="l00098"></a><span class="lineno"> 98</span> std::cin >> third_point.x >> third_point.<a class="code hl_variable" href="../../d8/dc8/struct_point.html#a2e1b5fb2b2a83571f5c0bc0f66a73cf7">y</a>;</div>
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<div class="line"><a id="l00099" name="l00099"></a><span class="lineno"> 99</span> std::cin >> forth_point.x >> forth_point.<a class="code hl_variable" href="../../d8/dc8/struct_point.html#a2e1b5fb2b2a83571f5c0bc0f66a73cf7">y</a>;</div>
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<div class="line"><a id="l00100" name="l00100"></a><span class="lineno"> 100</span> </div>
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<div class="line"><a id="l00101" name="l00101"></a><span class="lineno"> 101</span> printf(<span class="stringliteral">"%d"</span>, segment.intersect(first_point, second_point, third_point,</div>
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<div class="line"><a id="l00102" name="l00102"></a><span class="lineno"> 102</span> forth_point));</div>
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<div class="line"><a id="l00103" name="l00103"></a><span class="lineno"> 103</span> std::cout << std::endl;</div>
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<div class="line"><a id="l00104" name="l00104"></a><span class="lineno"> 104</span>}</div>
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</div>
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<div class="ttc" id="aline__segment__intersection_8cpp_html_ae66f6b31b5ad750f1fe042a706a4e3d4"><div class="ttname"><a href="../../d8/d6c/line__segment__intersection_8cpp.html#ae66f6b31b5ad750f1fe042a706a4e3d4">main</a></div><div class="ttdeci">int main()</div><div class="ttdef"><b>Definition</b> <a href="#l00092">line_segment_intersection.cpp:92</a></div></div>
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<div class="ttc" id="astruct_point_html"><div class="ttname"><a href="../../d8/dc8/struct_point.html">Point</a></div><div class="ttdef"><b>Definition</b> <a href="#l00012">line_segment_intersection.cpp:12</a></div></div>
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<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="#l00014">line_segment_intersection.cpp:14</a></div></div>
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<div class="ttc" id="astruct_point_html_ae2d6fb1b3fd3a96169d963d62e37130a"><div class="ttname"><a href="../../d8/dc8/struct_point.html#ae2d6fb1b3fd3a96169d963d62e37130a">Point::Point</a></div><div class="ttdeci">Point(double a=0.f, double b=0.f)</div><div class="ttdef"><b>Definition</b> <a href="../../d0/d01/smallest__circle_8cpp_source.html#l00023">smallest_circle.cpp:23</a></div></div>
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<div class="ttc" id="astruct_segment_intersection_html"><div class="ttname"><a href="../../d4/db4/struct_segment_intersection.html">SegmentIntersection</a></div><div class="ttdef"><b>Definition</b> <a href="#l00022">line_segment_intersection.cpp:22</a></div></div>
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<div class="ttc" id="astruct_segment_intersection_html_a008941b2272866c64cdaf959afa939bf"><div class="ttname"><a href="../../d4/db4/struct_segment_intersection.html#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="#l00075">line_segment_intersection.cpp:75</a></div></div>
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<div class="ttc" id="astruct_segment_intersection_html_a3beb2ac1b35d67354f1dbaf9a971e655"><div class="ttname"><a href="../../d4/db4/struct_segment_intersection.html#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="#l00063">line_segment_intersection.cpp:63</a></div></div>
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