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<a href="RulerTicks_8hxx.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="preprocessor">#ifndef RulerTicks_hxx</span></div>
<div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="preprocessor"></span><span class="preprocessor">#define RulerTicks_hxx</span></div>
<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="preprocessor">#include <cmath></span></div>
<div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="preprocessor">#include "<a class="code" href="Assert_8hxx.html" title="Bug hunting and detection facilities for developers.">Assert.hxx</a>"</span></div>
<div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="keyword">namespace </span>CLAM</div>
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> {</div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> </div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment">/*</span></div>
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="comment"> Implements the logic to place graphically several markers</span></div>
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment"> in a ruler so that the markers are placed with a given</span></div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment"> minimal separation and corresponds to round numbers</span></div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="comment"> on the mapped domain interval.</span></div>
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="comment"> So, given a domain value range, a pixel size and a minimal pixel gap,</span></div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="comment"> it gives you the domain offset for the first tick and the intertick gap</span></div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="comment"> also in domain units.</span></div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="comment"> Chosen round numbers are series so that the last non zero</span></div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="comment"> decimal steps in 1, 2 or 5 jumps and include 0. For instance:</span></div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="comment"> - 3.1, 3.2, 3.3...</span></div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="comment"> - 22, 24, 26...</span></div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="comment"> - 0.35, 0.40, 0.45...</span></div>
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="comment">*/</span></div>
<div class="line"><a name="l00023"></a><span class="lineno"><a class="code" href="classCLAM_1_1RulerTicks.html"> 23</a></span> <span class="keyword">class </span><a class="code" href="classCLAM_1_1RulerTicks.html">RulerTicks</a></div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span> {</div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span>  <span class="keyword">mutable</span> <span class="keywordtype">bool</span> _needsUpdate;</div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span> </div>
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span>  <span class="keywordtype">double</span> _min;</div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span>  <span class="keywordtype">double</span> _max;</div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span>  <span class="keywordtype">double</span> _minGap;</div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span>  <span class="keywordtype">double</span> _width;</div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span> </div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span>  <span class="keyword">mutable</span> <span class="keywordtype">double</span> _markOffset;</div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span>  <span class="keyword">mutable</span> <span class="keywordtype">double</span> _markGap;</div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span>  <span class="keyword">public</span>:</div>
<div class="line"><a name="l00035"></a><span class="lineno"><a class="code" href="classCLAM_1_1RulerTicks.html#a0f67c08fcde9682b7f7eb3f3ef3d936e"> 35</a></span>  <a class="code" href="classCLAM_1_1RulerTicks.html#a0f67c08fcde9682b7f7eb3f3ef3d936e">RulerTicks</a>()</div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span>  : _needsUpdate(true)</div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span>  , _min(0)</div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  , _max(1)</div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  , _minGap(5)</div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  , _width(100)</div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  , _markOffset(666)</div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  , _markGap(69)</div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  {</div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  }</div>
<div class="line"><a name="l00046"></a><span class="lineno"><a class="code" href="classCLAM_1_1RulerTicks.html#ada8dc66571f7d6a78aa37016af08f88e"> 46</a></span>  <span class="keywordtype">void</span> <a class="code" href="classCLAM_1_1RulerTicks.html#ada8dc66571f7d6a78aa37016af08f88e" title="Sets the domain value range.">setRange</a>(<span class="keywordtype">double</span> min, <span class="keywordtype">double</span> max)</div>
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  {</div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  <a class="code" href="Assert_8hxx.html#a0013fa617be6fec21a9ad7180e7d8cff" title="An assertion is a check on an expression that must be true given that all the contracts are fullfille...">CLAM_ASSERT</a>(min<max, <span class="stringliteral">"RulerTicks: Empty or inverse order range"</span>);</div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  _min = min;</div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  _max = max;</div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  _needsUpdate = <span class="keyword">true</span>;</div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  }</div>
<div class="line"><a name="l00054"></a><span class="lineno"><a class="code" href="classCLAM_1_1RulerTicks.html#a4448f609cb1278ebfe50b5b82f56311a"> 54</a></span>  <span class="keywordtype">void</span> <a class="code" href="classCLAM_1_1RulerTicks.html#a4448f609cb1278ebfe50b5b82f56311a" title="Sets the width in pixels to be mapped the range into.">setWidth</a>(<span class="keywordtype">double</span> width)</div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  {</div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  <a class="code" href="Assert_8hxx.html#a0013fa617be6fec21a9ad7180e7d8cff" title="An assertion is a check on an expression that must be true given that all the contracts are fullfille...">CLAM_ASSERT</a>(width>0, <span class="stringliteral">"RulerTicks: Pixel width should be greater than zero"</span>);</div>
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  _width = width;</div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  _needsUpdate = <span class="keyword">true</span>;</div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  }</div>
<div class="line"><a name="l00061"></a><span class="lineno"><a class="code" href="classCLAM_1_1RulerTicks.html#ab9df4610b4057a949a1165c694972cff"> 61</a></span>  <span class="keywordtype">void</span> <a class="code" href="classCLAM_1_1RulerTicks.html#ab9df4610b4057a949a1165c694972cff" title="Sets the minimum phisical space in pixels between between marks.">setMinGap</a>(<span class="keywordtype">double</span> minGap)</div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  {</div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  _minGap = minGap;</div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  _needsUpdate = <span class="keyword">true</span>;</div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  }</div>
<div class="line"><a name="l00066"></a><span class="lineno"><a class="code" href="classCLAM_1_1RulerTicks.html#a4e41876065bb0f2c52dc030fd42d6b89"> 66</a></span>  <span class="keywordtype">double</span> <a class="code" href="classCLAM_1_1RulerTicks.html#a4e41876065bb0f2c52dc030fd42d6b89">markOffset</a>()<span class="keyword"> const</span></div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span> <span class="keyword"> </span>{</div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  <span class="keywordflow">if</span> (_needsUpdate) <a class="code" href="classCLAM_1_1RulerTicks.html#a22442d970fba61f6dd61ac4f4be6d247">update</a>();</div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  <span class="keywordflow">return</span> _markOffset;</div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  }</div>
<div class="line"><a name="l00071"></a><span class="lineno"><a class="code" href="classCLAM_1_1RulerTicks.html#aa15a2f8c361b418223333d2501cbc2a9"> 71</a></span>  <span class="keywordtype">double</span> <a class="code" href="classCLAM_1_1RulerTicks.html#aa15a2f8c361b418223333d2501cbc2a9">markGap</a>()<span class="keyword"> const</span></div>
<div class="line"><a name="l00072"></a><span class="lineno"> 72</span> <span class="keyword"> </span>{</div>
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  <span class="keywordflow">if</span> (_needsUpdate) <a class="code" href="classCLAM_1_1RulerTicks.html#a22442d970fba61f6dd61ac4f4be6d247">update</a>();</div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  <span class="keywordflow">return</span> _markGap;</div>
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  }</div>
<div class="line"><a name="l00076"></a><span class="lineno"><a class="code" href="classCLAM_1_1RulerTicks.html#a22442d970fba61f6dd61ac4f4be6d247"> 76</a></span>  <span class="keywordtype">void</span> <a class="code" href="classCLAM_1_1RulerTicks.html#a22442d970fba61f6dd61ac4f4be6d247">update</a>()<span class="keyword"> const</span></div>
<div class="line"><a name="l00077"></a><span class="lineno"> 77</span> <span class="keyword"> </span>{</div>
<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  <span class="keywordtype">double</span> mappedMinGap = std::fabs(_minGap*(_max-_min)/_width);</div>
<div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  _markGap=1;</div>
<div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  <span class="keywordflow">if</span> (mappedMinGap>=1)</div>
<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  {</div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  <span class="keywordflow">while</span> (<span class="keyword">true</span>)</div>
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  {</div>
<div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  <span class="keywordflow">if</span> (_markGap>=mappedMinGap) <span class="keywordflow">break</span>;</div>
<div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  <span class="keywordflow">if</span> (_markGap*2>=mappedMinGap) {_markGap*=2; <span class="keywordflow">break</span>;}</div>
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  <span class="keywordflow">if</span> (_markGap*5>=mappedMinGap) {_markGap*=5; <span class="keywordflow">break</span>;}</div>
<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  _markGap*=10;</div>
<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  }</div>
<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  }</div>
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  <span class="keywordflow">else</span></div>
<div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  {</div>
<div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  <span class="keywordflow">while</span> (<span class="keyword">true</span>)</div>
<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  {</div>
<div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  <span class="keywordflow">if</span> (_markGap<1e-8) {_markGap=1e-8; <span class="keywordflow">break</span>;}</div>
<div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  <span class="keywordflow">if</span> (_markGap<mappedMinGap) {<span class="keywordflow">break</span>;}</div>
<div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  <span class="keywordflow">if</span> (_markGap/2<mappedMinGap) {_markGap/=2; <span class="keywordflow">break</span>;}</div>
<div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  <span class="keywordflow">if</span> (_markGap/5<mappedMinGap) {_markGap/=5; <span class="keywordflow">break</span>;}</div>
<div class="line"><a name="l00098"></a><span class="lineno"> 98</span>  _markGap/=10;</div>
<div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  }</div>
<div class="line"><a name="l00100"></a><span class="lineno"> 100</span>  }</div>
<div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  <span class="keywordtype">double</span> ceil = std::ceil(_min/_markGap);</div>
<div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  _markOffset = (std::fabs(ceil)<1e-5)? 0. : ceil*_markGap;</div>
<div class="line"><a name="l00103"></a><span class="lineno"> 103</span> </div>
<div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  _needsUpdate = <span class="keyword">false</span>;</div>
<div class="line"><a name="l00105"></a><span class="lineno"> 105</span>  }</div>
<div class="line"><a name="l00107"></a><span class="lineno"><a class="code" href="classCLAM_1_1RulerTicks.html#a7edc937c473d189291694b3cffda04aa"> 107</a></span>  <span class="keywordtype">double</span> <a class="code" href="classCLAM_1_1RulerTicks.html#a7edc937c473d189291694b3cffda04aa" title="Returns the domain value corresponding to tick i.">tickValue</a>(<span class="keywordtype">unsigned</span> i)<span class="keyword"> const</span></div>
<div class="line"><a name="l00108"></a><span class="lineno"> 108</span> <span class="keyword"> </span>{</div>
<div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  <span class="keywordflow">if</span> (_needsUpdate) <a class="code" href="classCLAM_1_1RulerTicks.html#a22442d970fba61f6dd61ac4f4be6d247">update</a>();</div>
<div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  <span class="keywordflow">return</span> _markOffset+_markGap*i;</div>
<div class="line"><a name="l00111"></a><span class="lineno"> 111</span>  }</div>
<div class="line"><a name="l00113"></a><span class="lineno"><a class="code" href="classCLAM_1_1RulerTicks.html#a4bee6e3121f945c1b052e42a8a0654b7"> 113</a></span>  <span class="keywordtype">double</span> <a class="code" href="classCLAM_1_1RulerTicks.html#a4bee6e3121f945c1b052e42a8a0654b7" title="Returns the pixel position of tick i.">pixelTickPos</a>(<span class="keywordtype">unsigned</span> i)<span class="keyword"> const</span></div>
<div class="line"><a name="l00114"></a><span class="lineno"> 114</span> <span class="keyword"> </span>{</div>
<div class="line"><a name="l00115"></a><span class="lineno"> 115</span>  <span class="keywordflow">return</span> <a class="code" href="classCLAM_1_1RulerTicks.html#a8d7fe57509e41327a737ad01a2f5a868">toPixel</a>(<a class="code" href="classCLAM_1_1RulerTicks.html#a7edc937c473d189291694b3cffda04aa" title="Returns the domain value corresponding to tick i.">tickValue</a>(i));</div>
<div class="line"><a name="l00116"></a><span class="lineno"> 116</span>  }</div>
<div class="line"><a name="l00117"></a><span class="lineno"> 117</span>  <span class="comment">// Returns the pixel position of a given domain value</span></div>
<div class="line"><a name="l00118"></a><span class="lineno"><a class="code" href="classCLAM_1_1RulerTicks.html#a8d7fe57509e41327a737ad01a2f5a868"> 118</a></span>  <span class="keywordtype">double</span> <a class="code" href="classCLAM_1_1RulerTicks.html#a8d7fe57509e41327a737ad01a2f5a868">toPixel</a>(<span class="keywordtype">double</span> value)<span class="keyword"> const</span></div>
<div class="line"><a name="l00119"></a><span class="lineno"> 119</span> <span class="keyword"> </span>{</div>
<div class="line"><a name="l00120"></a><span class="lineno"> 120</span>  <span class="keywordflow">return</span> (value-_min)*_width/(_max-_min);</div>
<div class="line"><a name="l00121"></a><span class="lineno"> 121</span>  }</div>
<div class="line"><a name="l00122"></a><span class="lineno"> 122</span>  <span class="comment">// Returns the number of ticks that will appear</span></div>
<div class="line"><a name="l00123"></a><span class="lineno"><a class="code" href="classCLAM_1_1RulerTicks.html#af7c72ab3df6777ae9dbf4703a7bd4096"> 123</a></span>  <span class="keywordtype">unsigned</span> <a class="code" href="classCLAM_1_1RulerTicks.html#af7c72ab3df6777ae9dbf4703a7bd4096">nTicks</a>()<span class="keyword"> const</span></div>
<div class="line"><a name="l00124"></a><span class="lineno"> 124</span> <span class="keyword"> </span>{</div>
<div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  <span class="keywordflow">if</span> (_needsUpdate) <a class="code" href="classCLAM_1_1RulerTicks.html#a22442d970fba61f6dd61ac4f4be6d247">update</a>();</div>
<div class="line"><a name="l00126"></a><span class="lineno"> 126</span>  <span class="keywordflow">return</span> std::ceil((_max-_markOffset)/_markGap);</div>
<div class="line"><a name="l00127"></a><span class="lineno"> 127</span>  }</div>
<div class="line"><a name="l00128"></a><span class="lineno"> 128</span> };</div>
<div class="line"><a name="l00129"></a><span class="lineno"> 129</span> </div>
<div class="line"><a name="l00130"></a><span class="lineno"> 130</span> } <span class="comment">// namespace CLAM</span></div>
<div class="line"><a name="l00131"></a><span class="lineno"> 131</span> </div>
<div class="line"><a name="l00132"></a><span class="lineno"> 132</span> <span class="preprocessor">#endif//RulerTicks_hxx</span></div>
<div class="line"><a name="l00133"></a><span class="lineno"> 133</span> <span class="preprocessor"></span></div>
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