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<a href="bresenham_8hpp.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><span class="comment">/* BSD 3-Clause License</span></div>
<div class="line"><a id="l00002" name="l00002"></a><span class="lineno"> 2</span><span class="comment"> *</span></div>
<div class="line"><a id="l00003" name="l00003"></a><span class="lineno"> 3</span><span class="comment"> * Copyright © 2008-2022, Jice and the libtcod contributors.</span></div>
<div class="line"><a id="l00004" name="l00004"></a><span class="lineno"> 4</span><span class="comment"> * All rights reserved.</span></div>
<div class="line"><a id="l00005" name="l00005"></a><span class="lineno"> 5</span><span class="comment"> *</span></div>
<div class="line"><a id="l00006" name="l00006"></a><span class="lineno"> 6</span><span class="comment"> * Redistribution and use in source and binary forms, with or without</span></div>
<div class="line"><a id="l00007" name="l00007"></a><span class="lineno"> 7</span><span class="comment"> * modification, are permitted provided that the following conditions are met:</span></div>
<div class="line"><a id="l00008" name="l00008"></a><span class="lineno"> 8</span><span class="comment"> *</span></div>
<div class="line"><a id="l00009" name="l00009"></a><span class="lineno"> 9</span><span class="comment"> * 1. Redistributions of source code must retain the above copyright notice,</span></div>
<div class="line"><a id="l00010" name="l00010"></a><span class="lineno"> 10</span><span class="comment"> * this list of conditions and the following disclaimer.</span></div>
<div class="line"><a id="l00011" name="l00011"></a><span class="lineno"> 11</span><span class="comment"> *</span></div>
<div class="line"><a id="l00012" name="l00012"></a><span class="lineno"> 12</span><span class="comment"> * 2. Redistributions in binary form must reproduce the above copyright notice,</span></div>
<div class="line"><a id="l00013" name="l00013"></a><span class="lineno"> 13</span><span class="comment"> * this list of conditions and the following disclaimer in the documentation</span></div>
<div class="line"><a id="l00014" name="l00014"></a><span class="lineno"> 14</span><span class="comment"> * and/or other materials provided with the distribution.</span></div>
<div class="line"><a id="l00015" name="l00015"></a><span class="lineno"> 15</span><span class="comment"> *</span></div>
<div class="line"><a id="l00016" name="l00016"></a><span class="lineno"> 16</span><span class="comment"> * 3. Neither the name of the copyright holder nor the names of its</span></div>
<div class="line"><a id="l00017" name="l00017"></a><span class="lineno"> 17</span><span class="comment"> * contributors may be used to endorse or promote products derived from</span></div>
<div class="line"><a id="l00018" name="l00018"></a><span class="lineno"> 18</span><span class="comment"> * this software without specific prior written permission.</span></div>
<div class="line"><a id="l00019" name="l00019"></a><span class="lineno"> 19</span><span class="comment"> *</span></div>
<div class="line"><a id="l00020" name="l00020"></a><span class="lineno"> 20</span><span class="comment"> * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"</span></div>
<div class="line"><a id="l00021" name="l00021"></a><span class="lineno"> 21</span><span class="comment"> * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE</span></div>
<div class="line"><a id="l00022" name="l00022"></a><span class="lineno"> 22</span><span class="comment"> * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE</span></div>
<div class="line"><a id="l00023" name="l00023"></a><span class="lineno"> 23</span><span class="comment"> * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE</span></div>
<div class="line"><a id="l00024" name="l00024"></a><span class="lineno"> 24</span><span class="comment"> * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR</span></div>
<div class="line"><a id="l00025" name="l00025"></a><span class="lineno"> 25</span><span class="comment"> * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF</span></div>
<div class="line"><a id="l00026" name="l00026"></a><span class="lineno"> 26</span><span class="comment"> * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS</span></div>
<div class="line"><a id="l00027" name="l00027"></a><span class="lineno"> 27</span><span class="comment"> * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN</span></div>
<div class="line"><a id="l00028" name="l00028"></a><span class="lineno"> 28</span><span class="comment"> * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)</span></div>
<div class="line"><a id="l00029" name="l00029"></a><span class="lineno"> 29</span><span class="comment"> * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE</span></div>
<div class="line"><a id="l00030" name="l00030"></a><span class="lineno"> 30</span><span class="comment"> * POSSIBILITY OF SUCH DAMAGE.</span></div>
<div class="line"><a id="l00031" name="l00031"></a><span class="lineno"> 31</span><span class="comment"> */</span></div>
<div class="line"><a id="l00034" name="l00034"></a><span class="lineno"> 34</span><span class="preprocessor">#ifndef _TCOD_BRESENHAM_HPP</span></div>
<div class="line"><a id="l00035" name="l00035"></a><span class="lineno"> 35</span><span class="preprocessor">#define _TCOD_BRESENHAM_HPP</span></div>
<div class="line"><a id="l00036" name="l00036"></a><span class="lineno"> 36</span> </div>
<div class="line"><a id="l00037" name="l00037"></a><span class="lineno"> 37</span><span class="preprocessor">#include <array></span></div>
<div class="line"><a id="l00038" name="l00038"></a><span class="lineno"> 38</span><span class="preprocessor">#include <functional></span></div>
<div class="line"><a id="l00039" name="l00039"></a><span class="lineno"> 39</span><span class="preprocessor">#include <iterator></span></div>
<div class="line"><a id="l00040" name="l00040"></a><span class="lineno"> 40</span><span class="preprocessor">#include <vector></span></div>
<div class="line"><a id="l00041" name="l00041"></a><span class="lineno"> 41</span> </div>
<div class="line"><a id="l00042" name="l00042"></a><span class="lineno"> 42</span><span class="preprocessor">#include "<a class="code" href="bresenham_8h.html">bresenham.h</a>"</span></div>
<div class="line"><a id="l00043" name="l00043"></a><span class="lineno"> 43</span> </div>
<div class="line"><a id="l00046" name="l00046"></a><span class="lineno"> 46</span> </div>
<div class="line"><a id="l00047" name="l00047"></a><span class="lineno"><a class="line" href="class_t_c_o_d_line_listener.html"> 47</a></span><span class="keyword">class </span>TCODLIB_API <a class="code hl_class" href="class_t_c_o_d_line_listener.html">TCODLineListener</a> {</div>
<div class="line"><a id="l00048" name="l00048"></a><span class="lineno"> 48</span> <span class="keyword">public</span>:</div>
<div class="line"><a id="l00049" name="l00049"></a><span class="lineno"> 49</span> <span class="keyword">virtual</span> <span class="keywordtype">bool</span> putPoint(<span class="keywordtype">int</span> x, <span class="keywordtype">int</span> y) = 0;</div>
<div class="line"><a id="l00050" name="l00050"></a><span class="lineno"> 50</span> <span class="keyword">virtual</span> <a class="code hl_class" href="class_t_c_o_d_line_listener.html">~TCODLineListener</a>() {}</div>
<div class="line"><a id="l00051" name="l00051"></a><span class="lineno"> 51</span>};</div>
<div class="line"><a id="l00052" name="l00052"></a><span class="lineno"> 52</span><span class="comment">// clang-format off</span></div>
<div class="line"><a id="l00053" name="l00053"></a><span class="lineno"><a class="line" href="class_t_c_o_d_line.html"> 53</a></span><span class="keyword">class </span>TCODLIB_API <a class="code hl_class" href="class_t_c_o_d_line.html">TCODLine</a> {</div>
<div class="line"><a id="l00054" name="l00054"></a><span class="lineno"> 54</span>public :</div>
<div class="line"><a id="l00070" name="l00070"></a><span class="lineno"><a class="line" href="class_t_c_o_d_line.html#a27fd42b7f0f0a41b6fad79edfa44a463"> 70</a></span> <span class="keyword">static</span> <span class="keywordtype">void</span> <a class="code hl_function" href="class_t_c_o_d_line.html#a27fd42b7f0f0a41b6fad79edfa44a463">init</a>(<span class="keywordtype">int</span> xFrom, <span class="keywordtype">int</span> yFrom, <span class="keywordtype">int</span> xTo, <span class="keywordtype">int</span> yTo);</div>
<div class="line"><a id="l00071" name="l00071"></a><span class="lineno"> 71</span> </div>
<div class="line"><a id="l00111" name="l00111"></a><span class="lineno"><a class="line" href="class_t_c_o_d_line.html#aec6bd9331b10b77db7757094fdc7ba8d"> 111</a></span> <span class="keyword">static</span> <span class="keywordtype">bool</span> <a class="code hl_function" href="class_t_c_o_d_line.html#aec6bd9331b10b77db7757094fdc7ba8d">step</a>(<span class="keywordtype">int</span> *xCur, <span class="keywordtype">int</span> *yCur);</div>
<div class="line"><a id="l00112" name="l00112"></a><span class="lineno"> 112</span> </div>
<div class="line"><a id="l00152" name="l00152"></a><span class="lineno"><a class="line" href="class_t_c_o_d_line.html#a98b11968c57473e888f5f0aa16bca702"> 152</a></span> <span class="keyword">static</span> <span class="keywordtype">bool</span> <a class="code hl_function" href="class_t_c_o_d_line.html#a98b11968c57473e888f5f0aa16bca702">line</a>(<span class="keywordtype">int</span> xFrom, <span class="keywordtype">int</span> yFrom, <span class="keywordtype">int</span> xTo, <span class="keywordtype">int</span> yTo, <a class="code hl_class" href="class_t_c_o_d_line_listener.html">TCODLineListener</a> *listener);</div>
<div class="line"><a id="l00153" name="l00153"></a><span class="lineno"> 153</span>};</div>
<div class="line"><a id="l00154" name="l00154"></a><span class="lineno"> 154</span><span class="comment">// clang-format on</span></div>
<div class="line"><a id="l00156" name="l00156"></a><span class="lineno"><a class="line" href="namespacetcod.html"> 156</a></span><span class="comment"></span><span class="keyword">namespace </span><a class="code hl_namespace" href="namespacetcod.html">tcod</a> {</div>
<div class="line"><a id="l00159" name="l00159"></a><span class="lineno"> 159</span> </div>
<div class="line"><a id="l00166" name="l00166"></a><span class="lineno"><a class="line" href="classtcod_1_1_bresenham_line.html"> 166</a></span><span class="keyword">class </span><a class="code hl_class" href="classtcod_1_1_bresenham_line.html">BresenhamLine</a> {</div>
<div class="line"><a id="l00167" name="l00167"></a><span class="lineno"> 167</span> <span class="keyword">public</span>:</div>
<div class="line"><a id="l00168" name="l00168"></a><span class="lineno"> 168</span> <span class="keyword">using </span>Point2 = std::array<int, 2>;</div>
<div class="line"><a id="l00169" name="l00169"></a><span class="lineno"> 169</span> <span class="keyword">using </span>iterator_category = std::random_access_iterator_tag;</div>
<div class="line"><a id="l00170" name="l00170"></a><span class="lineno"> 170</span> <span class="keyword">using </span>value_type = Point2;</div>
<div class="line"><a id="l00171" name="l00171"></a><span class="lineno"> 171</span> <span class="keyword">using </span>difference_type = int;</div>
<div class="line"><a id="l00172" name="l00172"></a><span class="lineno"> 172</span> <span class="keyword">using </span>pointer = void;</div>
<div class="line"><a id="l00173" name="l00173"></a><span class="lineno"> 173</span> <span class="keyword">using </span>reference = value_type;</div>
<div class="line"><a id="l00179" name="l00179"></a><span class="lineno"><a class="line" href="classtcod_1_1_bresenham_line.html#a742f725a785e2095de59303875f5dcdf"> 179</a></span> <span class="keyword">explicit</span> <a class="code hl_function" href="classtcod_1_1_bresenham_line.html#a742f725a785e2095de59303875f5dcdf">BresenhamLine</a>(Point2 <a class="code hl_function" href="classtcod_1_1_bresenham_line.html#a257a11ba30e285a64bb3398cb32ddf67">begin</a>, Point2 <a class="code hl_function" href="classtcod_1_1_bresenham_line.html#ad48a340a868638b5559aa0ed03f1f63a">end</a>) noexcept</div>
<div class="line"><a id="l00180" name="l00180"></a><span class="lineno"> 180</span> : origin_{<a class="code hl_function" href="classtcod_1_1_bresenham_line.html#a257a11ba30e285a64bb3398cb32ddf67">begin</a>},</div>
<div class="line"><a id="l00181" name="l00181"></a><span class="lineno"> 181</span> dest_{<a class="code hl_function" href="classtcod_1_1_bresenham_line.html#ad48a340a868638b5559aa0ed03f1f63a">end</a>},</div>
<div class="line"><a id="l00182" name="l00182"></a><span class="lineno"> 182</span> index_{0},</div>
<div class="line"><a id="l00183" name="l00183"></a><span class="lineno"> 183</span> index_end_{get_delta_x() + 1},</div>
<div class="line"><a id="l00184" name="l00184"></a><span class="lineno"> 184</span> cursor_{0, 0},</div>
<div class="line"><a id="l00185" name="l00185"></a><span class="lineno"> 185</span> y_error_{-get_delta_x() / 2} {}</div>
<div class="line"><a id="l00189" name="l00189"></a><span class="lineno"><a class="line" href="classtcod_1_1_bresenham_line.html#abdca7e8847dc4a21e9cfdd1c525a9fd5"> 189</a></span> <span class="keyword">explicit</span> <a class="code hl_function" href="classtcod_1_1_bresenham_line.html#abdca7e8847dc4a21e9cfdd1c525a9fd5">BresenhamLine</a>(Point2 <a class="code hl_function" href="classtcod_1_1_bresenham_line.html#a257a11ba30e285a64bb3398cb32ddf67">begin</a>, Point2 <a class="code hl_function" href="classtcod_1_1_bresenham_line.html#ad48a340a868638b5559aa0ed03f1f63a">end</a>, <span class="keywordtype">int</span> error) noexcept</div>
<div class="line"><a id="l00190" name="l00190"></a><span class="lineno"> 190</span> : origin_{<a class="code hl_function" href="classtcod_1_1_bresenham_line.html#a257a11ba30e285a64bb3398cb32ddf67">begin</a>},</div>
<div class="line"><a id="l00191" name="l00191"></a><span class="lineno"> 191</span> dest_{<a class="code hl_function" href="classtcod_1_1_bresenham_line.html#ad48a340a868638b5559aa0ed03f1f63a">end</a>},</div>
<div class="line"><a id="l00192" name="l00192"></a><span class="lineno"> 192</span> index_{0},</div>
<div class="line"><a id="l00193" name="l00193"></a><span class="lineno"> 193</span> index_end_{get_delta_x() + 1},</div>
<div class="line"><a id="l00194" name="l00194"></a><span class="lineno"> 194</span> cursor_{0, 0},</div>
<div class="line"><a id="l00195" name="l00195"></a><span class="lineno"> 195</span> y_error_{error > 0 ? error % get_delta_x() - get_delta_x() : error % get_delta_x()} {}</div>
<div class="line"><a id="l00196" name="l00196"></a><span class="lineno"> 196</span> </div>
<div class="line"><a id="l00197" name="l00197"></a><span class="lineno"> 197</span> <span class="keyword">inline</span> <a class="code hl_function" href="classtcod_1_1_bresenham_line.html#a742f725a785e2095de59303875f5dcdf">BresenhamLine</a>& operator++() noexcept {</div>
<div class="line"><a id="l00198" name="l00198"></a><span class="lineno"> 198</span> ++index_;</div>
<div class="line"><a id="l00199" name="l00199"></a><span class="lineno"> 199</span> <span class="keywordflow">return</span> *<span class="keyword">this</span>;</div>
<div class="line"><a id="l00200" name="l00200"></a><span class="lineno"> 200</span> }</div>
<div class="line"><a id="l00201" name="l00201"></a><span class="lineno"> 201</span> <span class="keyword">inline</span> <a class="code hl_function" href="classtcod_1_1_bresenham_line.html#a742f725a785e2095de59303875f5dcdf">BresenhamLine</a> operator++(<span class="keywordtype">int</span>) <span class="keyword">noexcept</span> {</div>
<div class="line"><a id="l00202" name="l00202"></a><span class="lineno"> 202</span> <span class="keyword">auto</span> tmp = *<span class="keyword">this</span>;</div>
<div class="line"><a id="l00203" name="l00203"></a><span class="lineno"> 203</span> ++(*this);</div>
<div class="line"><a id="l00204" name="l00204"></a><span class="lineno"> 204</span> <span class="keywordflow">return</span> tmp;</div>
<div class="line"><a id="l00205" name="l00205"></a><span class="lineno"> 205</span> }</div>
<div class="line"><a id="l00206" name="l00206"></a><span class="lineno"> 206</span> <span class="keyword">inline</span> <a class="code hl_function" href="classtcod_1_1_bresenham_line.html#a742f725a785e2095de59303875f5dcdf">BresenhamLine</a>& operator--() noexcept {</div>
<div class="line"><a id="l00207" name="l00207"></a><span class="lineno"> 207</span> --index_;</div>
<div class="line"><a id="l00208" name="l00208"></a><span class="lineno"> 208</span> <span class="keywordflow">return</span> *<span class="keyword">this</span>;</div>
<div class="line"><a id="l00209" name="l00209"></a><span class="lineno"> 209</span> }</div>
<div class="line"><a id="l00210" name="l00210"></a><span class="lineno"> 210</span> <span class="keyword">inline</span> <a class="code hl_function" href="classtcod_1_1_bresenham_line.html#a742f725a785e2095de59303875f5dcdf">BresenhamLine</a> operator--(<span class="keywordtype">int</span>) <span class="keyword">noexcept</span> {</div>
<div class="line"><a id="l00211" name="l00211"></a><span class="lineno"> 211</span> <span class="keyword">auto</span> tmp = *<span class="keyword">this</span>;</div>
<div class="line"><a id="l00212" name="l00212"></a><span class="lineno"> 212</span> --(*this);</div>
<div class="line"><a id="l00213" name="l00213"></a><span class="lineno"> 213</span> <span class="keywordflow">return</span> tmp;</div>
<div class="line"><a id="l00214" name="l00214"></a><span class="lineno"> 214</span> }</div>
<div class="line"><a id="l00223" name="l00223"></a><span class="lineno"><a class="line" href="classtcod_1_1_bresenham_line.html#a816fa5c15e65b50c4b7c70ce44ce2283"> 223</a></span> <span class="keyword">inline</span> value_type <a class="code hl_function" href="classtcod_1_1_bresenham_line.html#a816fa5c15e65b50c4b7c70ce44ce2283">operator[]</a>(<span class="keywordtype">int</span> index) <span class="keyword">noexcept</span> { <span class="keywordflow">return</span> bresenham_get(index_ + index); }</div>
<div class="line"><a id="l00227" name="l00227"></a><span class="lineno"><a class="line" href="classtcod_1_1_bresenham_line.html#a2352ddd2a564a88f1aceafc8f0d5b72a"> 227</a></span> <span class="keyword">inline</span> value_type <a class="code hl_function" href="classtcod_1_1_bresenham_line.html#a2352ddd2a564a88f1aceafc8f0d5b72a">operator*</a>() noexcept { <span class="keywordflow">return</span> (*<span class="keyword">this</span>)[0]; }</div>
<div class="line"><a id="l00228" name="l00228"></a><span class="lineno"> 228</span> <span class="keyword">inline</span> <span class="keyword">constexpr</span> <span class="keywordtype">bool</span> operator==(<span class="keyword">const</span> <a class="code hl_class" href="classtcod_1_1_bresenham_line.html">BresenhamLine</a>& rhs) <span class="keyword">const</span> <span class="keyword">noexcept</span> { <span class="keywordflow">return</span> index_ == rhs.index_; }</div>
<div class="line"><a id="l00229" name="l00229"></a><span class="lineno"> 229</span> <span class="keyword">inline</span> <span class="keyword">constexpr</span> <span class="keywordtype">bool</span> operator!=(<span class="keyword">const</span> BresenhamLine& rhs) <span class="keyword">const</span> <span class="keyword">noexcept</span> { <span class="keywordflow">return</span> !(*<span class="keyword">this</span> == rhs); }</div>
<div class="line"><a id="l00230" name="l00230"></a><span class="lineno"> 230</span> <span class="keyword">inline</span> <span class="keyword">constexpr</span> difference_type operator-(<span class="keyword">const</span> BresenhamLine& rhs) <span class="keyword">const</span> <span class="keyword">noexcept</span> { <span class="keywordflow">return</span> index_ - rhs.index_; }</div>
<div class="line"><a id="l00231" name="l00231"></a><span class="lineno"> 231</span> </div>
<div class="line"><a id="l00243" name="l00243"></a><span class="lineno"><a class="line" href="classtcod_1_1_bresenham_line.html#ad3cf21a900f82267047db0a2526eb0c4"> 243</a></span> <span class="keyword">inline</span> <a class="code hl_class" href="classtcod_1_1_bresenham_line.html">BresenhamLine</a> <a class="code hl_function" href="classtcod_1_1_bresenham_line.html#ad3cf21a900f82267047db0a2526eb0c4">adjust_range</a>(<span class="keywordtype">int</span> shift_begin, <span class="keywordtype">int</span> shift_end) <span class="keyword">const</span> <span class="keyword">noexcept</span> {</div>
<div class="line"><a id="l00244" name="l00244"></a><span class="lineno"> 244</span> <a class="code hl_class" href="classtcod_1_1_bresenham_line.html">BresenhamLine</a> new_data{*<span class="keyword">this</span>};</div>
<div class="line"><a id="l00245" name="l00245"></a><span class="lineno"> 245</span> new_data.index_ += shift_begin;</div>
<div class="line"><a id="l00246" name="l00246"></a><span class="lineno"> 246</span> new_data.index_end_ += shift_end;</div>
<div class="line"><a id="l00247" name="l00247"></a><span class="lineno"> 247</span> new_data.index_end_ = std::max(new_data.index_, new_data.index_end_);</div>
<div class="line"><a id="l00248" name="l00248"></a><span class="lineno"> 248</span> <span class="keywordflow">return</span> new_data;</div>
<div class="line"><a id="l00249" name="l00249"></a><span class="lineno"> 249</span> }</div>
<div class="line"><a id="l00259" name="l00259"></a><span class="lineno"><a class="line" href="classtcod_1_1_bresenham_line.html#af2cf74dece3fe04d6ab690c3718a527a"> 259</a></span> <span class="keyword">inline</span> <a class="code hl_class" href="classtcod_1_1_bresenham_line.html">BresenhamLine</a> <a class="code hl_function" href="classtcod_1_1_bresenham_line.html#af2cf74dece3fe04d6ab690c3718a527a">without_start</a>() const noexcept { <span class="keywordflow">return</span> <a class="code hl_function" href="classtcod_1_1_bresenham_line.html#ad3cf21a900f82267047db0a2526eb0c4">adjust_range</a>(1, 0); }</div>
<div class="line"><a id="l00269" name="l00269"></a><span class="lineno"><a class="line" href="classtcod_1_1_bresenham_line.html#a4711a26c8b075b893c8bb105aa965357"> 269</a></span> <span class="keyword">inline</span> <a class="code hl_class" href="classtcod_1_1_bresenham_line.html">BresenhamLine</a> <a class="code hl_function" href="classtcod_1_1_bresenham_line.html#a4711a26c8b075b893c8bb105aa965357">without_end</a>() const noexcept { <span class="keywordflow">return</span> <a class="code hl_function" href="classtcod_1_1_bresenham_line.html#ad3cf21a900f82267047db0a2526eb0c4">adjust_range</a>(0, -1); }</div>
<div class="line"><a id="l00279" name="l00279"></a><span class="lineno"><a class="line" href="classtcod_1_1_bresenham_line.html#a0696e7f3e60c224ba4f362434369d138"> 279</a></span> <span class="keyword">inline</span> <a class="code hl_class" href="classtcod_1_1_bresenham_line.html">BresenhamLine</a> <a class="code hl_function" href="classtcod_1_1_bresenham_line.html#a0696e7f3e60c224ba4f362434369d138">without_endpoints</a>() const noexcept { <span class="keywordflow">return</span> <a class="code hl_function" href="classtcod_1_1_bresenham_line.html#ad3cf21a900f82267047db0a2526eb0c4">adjust_range</a>(1, -1); }</div>
<div class="line"><a id="l00283" name="l00283"></a><span class="lineno"><a class="line" href="classtcod_1_1_bresenham_line.html#a257a11ba30e285a64bb3398cb32ddf67"> 283</a></span> <span class="keyword">inline</span> <a class="code hl_class" href="classtcod_1_1_bresenham_line.html">BresenhamLine</a> <a class="code hl_function" href="classtcod_1_1_bresenham_line.html#a257a11ba30e285a64bb3398cb32ddf67">begin</a>() const noexcept { <span class="keywordflow">return</span> {*<span class="keyword">this</span>}; }</div>
<div class="line"><a id="l00287" name="l00287"></a><span class="lineno"><a class="line" href="classtcod_1_1_bresenham_line.html#ad48a340a868638b5559aa0ed03f1f63a"> 287</a></span> <span class="keyword">inline</span> <a class="code hl_class" href="classtcod_1_1_bresenham_line.html">BresenhamLine</a> <a class="code hl_function" href="classtcod_1_1_bresenham_line.html#ad48a340a868638b5559aa0ed03f1f63a">end</a>() const noexcept {</div>
<div class="line"><a id="l00288" name="l00288"></a><span class="lineno"> 288</span> <span class="keywordflow">return</span> <a class="code hl_class" href="classtcod_1_1_bresenham_line.html">BresenhamLine</a>{origin_, dest_, index_end_, index_end_, cursor_, y_error_};</div>
<div class="line"><a id="l00289" name="l00289"></a><span class="lineno"> 289</span> }</div>
<div class="line"><a id="l00290" name="l00290"></a><span class="lineno"> 290</span> </div>
<div class="line"><a id="l00291" name="l00291"></a><span class="lineno"> 291</span> <span class="keyword">private</span>:</div>
<div class="line"><a id="l00295" name="l00295"></a><span class="lineno"> 295</span> <span class="keyword">struct </span><a class="code hl_class" href="classtcod_1_1_matrix.html">Matrix</a> {</div>
<div class="line"><a id="l00299" name="l00299"></a><span class="lineno"> 299</span> <span class="keyword">inline</span> Point2 transform(<span class="keyword">const</span> Point2& cursor) <span class="keyword">const</span> <span class="keyword">noexcept</span> {</div>
<div class="line"><a id="l00300" name="l00300"></a><span class="lineno"> 300</span> <span class="keywordflow">return</span> {ax + cursor.<a class="code hl_function" href="classtcod_1_1_matrix.html#a0c58b3c9547dee46ade87757d5518db3">at</a>(0) * xx + cursor.at(1) * yx, ay + cursor.at(0) * xy + cursor.at(1) * yy};</div>
<div class="line"><a id="l00301" name="l00301"></a><span class="lineno"> 301</span> }</div>
<div class="line"><a id="l00302" name="l00302"></a><span class="lineno"> 302</span> <span class="keywordtype">int</span> ax; <span class="comment">// Affine transformation on X.</span></div>
<div class="line"><a id="l00303" name="l00303"></a><span class="lineno"> 303</span> <span class="keywordtype">int</span> ay; <span class="comment">// Affine transformation on Y.</span></div>
<div class="line"><a id="l00304" name="l00304"></a><span class="lineno"> 304</span> int_fast8_t xx; <span class="comment">// Index to world X.</span></div>
<div class="line"><a id="l00305" name="l00305"></a><span class="lineno"> 305</span> int_fast8_t xy; <span class="comment">// Index to world Y.</span></div>
<div class="line"><a id="l00306" name="l00306"></a><span class="lineno"> 306</span> int_fast8_t yx; <span class="comment">// Cursor Y to world X.</span></div>
<div class="line"><a id="l00307" name="l00307"></a><span class="lineno"> 307</span> int_fast8_t yy; <span class="comment">// Cursor Y to world Y.</span></div>
<div class="line"><a id="l00308" name="l00308"></a><span class="lineno"> 308</span> };</div>
<div class="line"><a id="l00312" name="l00312"></a><span class="lineno"> 312</span> <span class="keyword">inline</span> Matrix get_matrix() const noexcept { <span class="keywordflow">return</span> get_matrix(origin_, dest_); }</div>
<div class="line"><a id="l00313" name="l00313"></a><span class="lineno"> 313</span> <span class="keyword">static</span> Matrix get_matrix(<span class="keyword">const</span> Point2& origin, <span class="keyword">const</span> Point2& dest) <span class="keyword">noexcept</span> {</div>
<div class="line"><a id="l00314" name="l00314"></a><span class="lineno"> 314</span> <span class="keyword">const</span> <span class="keywordtype">int</span> delta_x = dest.at(0) - origin.at(0);</div>
<div class="line"><a id="l00315" name="l00315"></a><span class="lineno"> 315</span> <span class="keyword">const</span> <span class="keywordtype">int</span> delta_y = dest.at(1) - origin.at(1);</div>
<div class="line"><a id="l00316" name="l00316"></a><span class="lineno"> 316</span> Matrix matrix{</div>
<div class="line"><a id="l00317" name="l00317"></a><span class="lineno"> 317</span> origin.at(0),</div>
<div class="line"><a id="l00318" name="l00318"></a><span class="lineno"> 318</span> origin.at(1),</div>
<div class="line"><a id="l00319" name="l00319"></a><span class="lineno"> 319</span> 1,</div>
<div class="line"><a id="l00320" name="l00320"></a><span class="lineno"> 320</span> 0,</div>
<div class="line"><a id="l00321" name="l00321"></a><span class="lineno"> 321</span> 0,</div>
<div class="line"><a id="l00322" name="l00322"></a><span class="lineno"> 322</span> 1,</div>
<div class="line"><a id="l00323" name="l00323"></a><span class="lineno"> 323</span> };</div>
<div class="line"><a id="l00324" name="l00324"></a><span class="lineno"> 324</span> <span class="keywordflow">if</span> (delta_x < 0) matrix.xx = -1;</div>
<div class="line"><a id="l00325" name="l00325"></a><span class="lineno"> 325</span> <span class="keywordflow">if</span> (delta_y < 0) matrix.yy = -1;</div>
<div class="line"><a id="l00326" name="l00326"></a><span class="lineno"> 326</span> <span class="keywordflow">if</span> (std::abs(delta_y) > std::abs(delta_x)) {</div>
<div class="line"><a id="l00327" name="l00327"></a><span class="lineno"> 327</span> std::swap(matrix.xx, matrix.yx);</div>
<div class="line"><a id="l00328" name="l00328"></a><span class="lineno"> 328</span> std::swap(matrix.xy, matrix.yy);</div>
<div class="line"><a id="l00329" name="l00329"></a><span class="lineno"> 329</span> }</div>
<div class="line"><a id="l00330" name="l00330"></a><span class="lineno"> 330</span> <span class="keywordflow">return</span> matrix;</div>
<div class="line"><a id="l00331" name="l00331"></a><span class="lineno"> 331</span> }</div>
<div class="line"><a id="l00332" name="l00332"></a><span class="lineno"> 332</span> <span class="keyword">explicit</span> <a class="code hl_function" href="classtcod_1_1_bresenham_line.html#a742f725a785e2095de59303875f5dcdf">BresenhamLine</a>(Point2 <a class="code hl_function" href="classtcod_1_1_bresenham_line.html#a257a11ba30e285a64bb3398cb32ddf67">begin</a>, Point2 <a class="code hl_function" href="classtcod_1_1_bresenham_line.html#ad48a340a868638b5559aa0ed03f1f63a">end</a>, <span class="keywordtype">int</span> index_begin, <span class="keywordtype">int</span> index_end, Point2 cursor, <span class="keywordtype">int</span> error) noexcept</div>
<div class="line"><a id="l00333" name="l00333"></a><span class="lineno"> 333</span> : origin_{<a class="code hl_function" href="classtcod_1_1_bresenham_line.html#a257a11ba30e285a64bb3398cb32ddf67">begin</a>}, dest_{<a class="code hl_function" href="classtcod_1_1_bresenham_line.html#ad48a340a868638b5559aa0ed03f1f63a">end</a>}, index_{index_begin}, index_end_{index_end}, cursor_{cursor}, y_error_{error} {}</div>
<div class="line"><a id="l00339" name="l00339"></a><span class="lineno"> 339</span> <span class="keyword">inline</span> Point2 get_normalized_delta() const noexcept { <span class="keywordflow">return</span> get_normalized_delta(origin_, dest_); }</div>
<div class="line"><a id="l00340" name="l00340"></a><span class="lineno"> 340</span> <span class="keyword">static</span> Point2 get_normalized_delta(<span class="keyword">const</span> Point2& origin, <span class="keyword">const</span> Point2& dest) <span class="keyword">noexcept</span> {</div>
<div class="line"><a id="l00341" name="l00341"></a><span class="lineno"> 341</span> <span class="keywordflow">return</span> std::abs(dest.at(0) - origin.at(0)) > std::abs(dest.at(1) - origin.at(1))</div>
<div class="line"><a id="l00342" name="l00342"></a><span class="lineno"> 342</span> ? Point2{std::abs(dest.at(0) - origin.at(0)), std::abs(dest.at(1) - origin.at(1))}</div>
<div class="line"><a id="l00343" name="l00343"></a><span class="lineno"> 343</span> : Point2{std::abs(dest.at(1) - origin.at(1)), std::abs(dest.at(0) - origin.at(0))};</div>
<div class="line"><a id="l00344" name="l00344"></a><span class="lineno"> 344</span> }</div>
<div class="line"><a id="l00350" name="l00350"></a><span class="lineno"> 350</span> <span class="keyword">inline</span> <span class="keywordtype">int</span> get_delta_x() const noexcept { <span class="keywordflow">return</span> get_normalized_delta().at(0); }</div>
<div class="line"><a id="l00354" name="l00354"></a><span class="lineno"> 354</span> <span class="keyword">inline</span> <a class="code hl_function" href="classtcod_1_1_bresenham_line.html#a742f725a785e2095de59303875f5dcdf">BresenhamLine</a>& bresenham_next() {</div>
<div class="line"><a id="l00355" name="l00355"></a><span class="lineno"> 355</span> <span class="keyword">const</span> Point2 delta = get_normalized_delta();</div>
<div class="line"><a id="l00356" name="l00356"></a><span class="lineno"> 356</span> y_error_ += delta.at(1);</div>
<div class="line"><a id="l00357" name="l00357"></a><span class="lineno"> 357</span> <span class="keywordflow">if</span> (y_error_ > 0) {</div>
<div class="line"><a id="l00358" name="l00358"></a><span class="lineno"> 358</span> ++cursor_.at(1);</div>
<div class="line"><a id="l00359" name="l00359"></a><span class="lineno"> 359</span> y_error_ -= delta.at(0);</div>
<div class="line"><a id="l00360" name="l00360"></a><span class="lineno"> 360</span> };</div>
<div class="line"><a id="l00361" name="l00361"></a><span class="lineno"> 361</span> ++cursor_.at(0);</div>
<div class="line"><a id="l00362" name="l00362"></a><span class="lineno"> 362</span> <span class="keywordflow">return</span> *<span class="keyword">this</span>;</div>
<div class="line"><a id="l00363" name="l00363"></a><span class="lineno"> 363</span> }</div>
<div class="line"><a id="l00367" name="l00367"></a><span class="lineno"> 367</span> <span class="keyword">inline</span> <a class="code hl_function" href="classtcod_1_1_bresenham_line.html#a742f725a785e2095de59303875f5dcdf">BresenhamLine</a>& bresenham_prev() {</div>
<div class="line"><a id="l00368" name="l00368"></a><span class="lineno"> 368</span> <span class="keyword">const</span> Point2 delta = get_normalized_delta();</div>
<div class="line"><a id="l00369" name="l00369"></a><span class="lineno"> 369</span> y_error_ -= delta.at(1);</div>
<div class="line"><a id="l00370" name="l00370"></a><span class="lineno"> 370</span> <span class="keywordflow">if</span> (y_error_ <= -delta.at(0)) {</div>
<div class="line"><a id="l00371" name="l00371"></a><span class="lineno"> 371</span> --cursor_.at(1);</div>
<div class="line"><a id="l00372" name="l00372"></a><span class="lineno"> 372</span> y_error_ += delta.at(0);</div>
<div class="line"><a id="l00373" name="l00373"></a><span class="lineno"> 373</span> };</div>
<div class="line"><a id="l00374" name="l00374"></a><span class="lineno"> 374</span> --cursor_.at(0);</div>
<div class="line"><a id="l00375" name="l00375"></a><span class="lineno"> 375</span> <span class="keywordflow">return</span> *<span class="keyword">this</span>;</div>
<div class="line"><a id="l00376" name="l00376"></a><span class="lineno"> 376</span> }</div>
<div class="line"><a id="l00380" name="l00380"></a><span class="lineno"> 380</span> <span class="keyword">inline</span> Point2 bresenham_get(<span class="keywordtype">int</span> index) {</div>
<div class="line"><a id="l00381" name="l00381"></a><span class="lineno"> 381</span> <span class="keywordflow">while</span> (cursor_.at(0) < index) bresenham_next();</div>
<div class="line"><a id="l00382" name="l00382"></a><span class="lineno"> 382</span> <span class="keywordflow">while</span> (cursor_.at(0) > index) bresenham_prev();</div>
<div class="line"><a id="l00383" name="l00383"></a><span class="lineno"> 383</span> <span class="keywordflow">return</span> get_matrix().transform(cursor_);</div>
<div class="line"><a id="l00384" name="l00384"></a><span class="lineno"> 384</span> }</div>
<div class="line"><a id="l00385" name="l00385"></a><span class="lineno"> 385</span> Point2 origin_; <span class="comment">// Starting point.</span></div>
<div class="line"><a id="l00386" name="l00386"></a><span class="lineno"> 386</span> Point2 dest_; <span class="comment">// Ending point.</span></div>
<div class="line"><a id="l00387" name="l00387"></a><span class="lineno"> 387</span> <span class="keywordtype">int</span> index_; <span class="comment">// The starting index returned by `begin`.</span></div>
<div class="line"><a id="l00388" name="l00388"></a><span class="lineno"> 388</span> <span class="keywordtype">int</span> index_end_; <span class="comment">// The past-the-end index returned by `end`.</span></div>
<div class="line"><a id="l00389" name="l00389"></a><span class="lineno"> 389</span> Point2 cursor_; <span class="comment">// Normalized Bresenham low-slope position. First axis acts as the current index.</span></div>
<div class="line"><a id="l00390" name="l00390"></a><span class="lineno"> 390</span> <span class="keywordtype">int</span> y_error_; <span class="comment">// Fractional difference between Y indexes. Is always `-delta[0] < err <= 0`.</span></div>
<div class="line"><a id="l00391" name="l00391"></a><span class="lineno"> 391</span>};</div>
<div class="line"><a id="l00393" name="l00393"></a><span class="lineno"> 393</span>} <span class="comment">// namespace tcod</span></div>
<div class="line"><a id="l00394" name="l00394"></a><span class="lineno"> 394</span><span class="preprocessor">#endif</span></div>
<div class="ttc" id="abresenham_8h_html"><div class="ttname"><a href="bresenham_8h.html">bresenham.h</a></div><div class="ttdoc">Bresenham line module.</div></div>
<div class="ttc" id="aclass_t_c_o_d_line_html"><div class="ttname"><a href="class_t_c_o_d_line.html">TCODLine</a></div><div class="ttdef"><b>Definition:</b> bresenham.hpp:53</div></div>
<div class="ttc" id="aclass_t_c_o_d_line_html_a27fd42b7f0f0a41b6fad79edfa44a463"><div class="ttname"><a href="class_t_c_o_d_line.html#a27fd42b7f0f0a41b6fad79edfa44a463">TCODLine::init</a></div><div class="ttdeci">static void init(int xFrom, int yFrom, int xTo, int yTo)</div><div class="ttdoc">First, you have to initialize the toolkit with your starting and ending coordinates.</div></div>
<div class="ttc" id="aclass_t_c_o_d_line_html_a98b11968c57473e888f5f0aa16bca702"><div class="ttname"><a href="class_t_c_o_d_line.html#a98b11968c57473e888f5f0aa16bca702">TCODLine::line</a></div><div class="ttdeci">static bool line(int xFrom, int yFrom, int xTo, int yTo, TCODLineListener *listener)</div><div class="ttdoc">The function returns false if the line has been interrupted by the callback (it returned false before...</div></div>
<div class="ttc" id="aclass_t_c_o_d_line_html_aec6bd9331b10b77db7757094fdc7ba8d"><div class="ttname"><a href="class_t_c_o_d_line.html#aec6bd9331b10b77db7757094fdc7ba8d">TCODLine::step</a></div><div class="ttdeci">static bool step(int *xCur, int *yCur)</div><div class="ttdoc">You can then step through each cell with this function.</div></div>
<div class="ttc" id="aclass_t_c_o_d_line_listener_html"><div class="ttname"><a href="class_t_c_o_d_line_listener.html">TCODLineListener</a></div><div class="ttdef"><b>Definition:</b> bresenham.hpp:47</div></div>
<div class="ttc" id="aclasstcod_1_1_bresenham_line_html"><div class="ttname"><a href="classtcod_1_1_bresenham_line.html">tcod::BresenhamLine</a></div><div class="ttdoc">Encapsulates a Bresenham line drawing algorithm.</div><div class="ttdef"><b>Definition:</b> bresenham.hpp:166</div></div>
<div class="ttc" id="aclasstcod_1_1_bresenham_line_html_a0696e7f3e60c224ba4f362434369d138"><div class="ttname"><a href="classtcod_1_1_bresenham_line.html#a0696e7f3e60c224ba4f362434369d138">tcod::BresenhamLine::without_endpoints</a></div><div class="ttdeci">BresenhamLine without_endpoints() const noexcept</div><div class="ttdef"><b>Definition:</b> bresenham.hpp:279</div></div>
<div class="ttc" id="aclasstcod_1_1_bresenham_line_html_a2352ddd2a564a88f1aceafc8f0d5b72a"><div class="ttname"><a href="classtcod_1_1_bresenham_line.html#a2352ddd2a564a88f1aceafc8f0d5b72a">tcod::BresenhamLine::operator*</a></div><div class="ttdeci">value_type operator*() noexcept</div><div class="ttdoc">Return the world position of the Bresenham at the current index.</div><div class="ttdef"><b>Definition:</b> bresenham.hpp:227</div></div>
<div class="ttc" id="aclasstcod_1_1_bresenham_line_html_a257a11ba30e285a64bb3398cb32ddf67"><div class="ttname"><a href="classtcod_1_1_bresenham_line.html#a257a11ba30e285a64bb3398cb32ddf67">tcod::BresenhamLine::begin</a></div><div class="ttdeci">BresenhamLine begin() const noexcept</div><div class="ttdoc">Return the beginning iterator, which is a copy of the current object.</div><div class="ttdef"><b>Definition:</b> bresenham.hpp:283</div></div>
<div class="ttc" id="aclasstcod_1_1_bresenham_line_html_a4711a26c8b075b893c8bb105aa965357"><div class="ttname"><a href="classtcod_1_1_bresenham_line.html#a4711a26c8b075b893c8bb105aa965357">tcod::BresenhamLine::without_end</a></div><div class="ttdeci">BresenhamLine without_end() const noexcept</div><div class="ttdef"><b>Definition:</b> bresenham.hpp:269</div></div>
<div class="ttc" id="aclasstcod_1_1_bresenham_line_html_a742f725a785e2095de59303875f5dcdf"><div class="ttname"><a href="classtcod_1_1_bresenham_line.html#a742f725a785e2095de59303875f5dcdf">tcod::BresenhamLine::BresenhamLine</a></div><div class="ttdeci">BresenhamLine(Point2 begin, Point2 end) noexcept</div><div class="ttdoc">Construct a new Bresenham line from begin to end.</div><div class="ttdef"><b>Definition:</b> bresenham.hpp:179</div></div>
<div class="ttc" id="aclasstcod_1_1_bresenham_line_html_a816fa5c15e65b50c4b7c70ce44ce2283"><div class="ttname"><a href="classtcod_1_1_bresenham_line.html#a816fa5c15e65b50c4b7c70ce44ce2283">tcod::BresenhamLine::operator[]</a></div><div class="ttdeci">value_type operator[](int index) noexcept</div><div class="ttdoc">Return the world position of the Bresenham at the index relative to the current index.</div><div class="ttdef"><b>Definition:</b> bresenham.hpp:223</div></div>
<div class="ttc" id="aclasstcod_1_1_bresenham_line_html_abdca7e8847dc4a21e9cfdd1c525a9fd5"><div class="ttname"><a href="classtcod_1_1_bresenham_line.html#abdca7e8847dc4a21e9cfdd1c525a9fd5">tcod::BresenhamLine::BresenhamLine</a></div><div class="ttdeci">BresenhamLine(Point2 begin, Point2 end, int error) noexcept</div><div class="ttdoc">Construct a new Bresenham line with a manually given error value.</div><div class="ttdef"><b>Definition:</b> bresenham.hpp:189</div></div>
<div class="ttc" id="aclasstcod_1_1_bresenham_line_html_ad3cf21a900f82267047db0a2526eb0c4"><div class="ttname"><a href="classtcod_1_1_bresenham_line.html#ad3cf21a900f82267047db0a2526eb0c4">tcod::BresenhamLine::adjust_range</a></div><div class="ttdeci">BresenhamLine adjust_range(int shift_begin, int shift_end) const noexcept</div><div class="ttdef"><b>Definition:</b> bresenham.hpp:243</div></div>
<div class="ttc" id="aclasstcod_1_1_bresenham_line_html_ad48a340a868638b5559aa0ed03f1f63a"><div class="ttname"><a href="classtcod_1_1_bresenham_line.html#ad48a340a868638b5559aa0ed03f1f63a">tcod::BresenhamLine::end</a></div><div class="ttdeci">BresenhamLine end() const noexcept</div><div class="ttdoc">Return the past-the-end iterator.</div><div class="ttdef"><b>Definition:</b> bresenham.hpp:287</div></div>
<div class="ttc" id="aclasstcod_1_1_bresenham_line_html_af2cf74dece3fe04d6ab690c3718a527a"><div class="ttname"><a href="classtcod_1_1_bresenham_line.html#af2cf74dece3fe04d6ab690c3718a527a">tcod::BresenhamLine::without_start</a></div><div class="ttdeci">BresenhamLine without_start() const noexcept</div><div class="ttdef"><b>Definition:</b> bresenham.hpp:259</div></div>
<div class="ttc" id="aclasstcod_1_1_matrix_html"><div class="ttname"><a href="classtcod_1_1_matrix.html">tcod::Matrix</a></div><div class="ttdoc">A template container for holding a multi-dimensional array of items.</div><div class="ttdef"><b>Definition:</b> matrix.hpp:138</div></div>
<div class="ttc" id="aclasstcod_1_1_matrix_html_a0c58b3c9547dee46ade87757d5518db3"><div class="ttname"><a href="classtcod_1_1_matrix.html#a0c58b3c9547dee46ade87757d5518db3">tcod::Matrix::at</a></div><div class="ttdeci">constexpr reference at(const index_type &index)</div><div class="ttdoc">Get the item at index, checking bounds.</div><div class="ttdef"><b>Definition:</b> matrix.hpp:173</div></div>
<div class="ttc" id="anamespacetcod_html"><div class="ttname"><a href="namespacetcod.html">tcod</a></div><div class="ttdoc">The libtcod namespace.</div><div class="ttdef"><b>Definition:</b> bresenham.hpp:156</div></div>
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