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<h1>pointillism.h File Reference</h1>
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This graph shows which files directly or indirectly include this file:</div>
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<a href="pointillism_8h_source.html">Go to the source code of this file.</a><table border="0" cellpadding="0" cellspacing="0">
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<tr><td colspan="2"><br><h2>Functions</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">QImage * </td><td class="memItemRight" valign="bottom"><a class="el" href="pointillism_8h.html#34b6840048618481c95bfcd7dd5892c3">pointillismEffect</a> (QString filename, <a class="el" href="classManipulationOptions.html">ManipulationOptions</a> *options)</td></tr>
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<hr><h2>Function Documentation</h2>
<a class="anchor" name="34b6840048618481c95bfcd7dd5892c3"></a><!-- doxytag: member="pointillism.h::pointillismEffect" ref="34b6840048618481c95bfcd7dd5892c3" args="(QString filename, ManipulationOptions *options)" -->
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<td class="memname">QImage* pointillismEffect </td>
<td>(</td>
<td class="paramtype">QString </td>
<td class="paramname"> <em>filename</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="classManipulationOptions.html">ManipulationOptions</a> * </td>
<td class="paramname"> <em>options</em></td><td> </td>
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<p>Definition at line <a class="el" href="pointillism_8cpp_source.html#l00109">109</a> of file <a class="el" href="pointillism_8cpp_source.html">pointillism.cpp</a>.</p>
<p>References <a class="el" href="blackWhite_8cpp_source.html#l00060">blackWhiteEffect()</a>, <a class="el" href="pointillism_8cpp_source.html#l00067">computeLocalGrayVal()</a>, <a class="el" href="pointillism_8cpp_source.html#l00098">drawDotAt()</a>, <a class="el" href="redEye__internal_8h_source.html#l00037">editedImage</a>, <a class="el" href="blur_8cpp_source.html#l00079">height</a>, <a class="el" href="pointillism_8cpp_source.html#l00042">pickRandomPixelWithinBlock()</a>, and <a class="el" href="blur_8cpp_source.html#l00079">width</a>.</p>
<p>Referenced by <a class="el" href="editingInterface_8cpp_source.html#l00834">EditingInterface::applyEffect()</a>.</p>
<div class="fragment"><pre class="fragment"><a name="l00110"></a>00110 {
<a name="l00111"></a>00111 <span class="comment">//intialize seed using current time</span>
<a name="l00112"></a>00112 srand( <span class="keywordtype">unsigned</span>(time(NULL)) );
<a name="l00113"></a>00113
<a name="l00114"></a>00114 <span class="comment">//load original image and convert to grayscale</span>
<a name="l00115"></a>00115 QImage* originalImage = <a class="code" href="blackWhite_8cpp.html#81188751080c22115720554f1ce6a30f">blackWhiteEffect</a>( filename, NULL );
<a name="l00116"></a>00116
<a name="l00117"></a>00117 <span class="comment">//construct edited image</span>
<a name="l00118"></a>00118 QImage* <a class="code" href="redEye__internal_8h.html#63116a8b94b4ed0e99ddcb7f6f3bd919">editedImage</a> = <span class="keyword">new</span> QImage( originalImage->width(),
<a name="l00119"></a>00119 originalImage->height(),
<a name="l00120"></a>00120 originalImage->depth() );
<a name="l00121"></a>00121
<a name="l00122"></a>00122 <span class="comment">//fill with white since we'll be drawing black/color dots on top</span>
<a name="l00123"></a>00123 editedImage->fill( qRgb(255,255,255) );
<a name="l00124"></a>00124
<a name="l00125"></a>00125 <span class="comment">//break image into BLOCK_SIZE x BLOCK_SIZE blocks. iterate over</span>
<a name="l00126"></a>00126 <span class="comment">//each block and pick a random pixel within. Local</span>
<a name="l00127"></a>00127 <span class="comment">//average gray value in edited image is > originalImage + thresh</span>
<a name="l00128"></a>00128 <span class="comment">//then draw a dot at pixel. continue doing this for each block</span>
<a name="l00129"></a>00129 <span class="comment">//and repeat until ???</span>
<a name="l00130"></a>00130 <span class="keyword">const</span> <span class="keywordtype">int</span> BLOCK_SIZE = 8;
<a name="l00131"></a>00131
<a name="l00132"></a>00132 <span class="comment">//compute image size in blocks</span>
<a name="l00133"></a>00133 <span class="keywordtype">int</span> blocksWide = editedImage->width() / BLOCK_SIZE;
<a name="l00134"></a>00134 <span class="keywordflow">if</span>(blocksWide*BLOCK_SIZE < editedImage-><a class="code" href="blur_8cpp.html#2474a5474cbff19523a51eb1de01cda4">width</a>())
<a name="l00135"></a>00135 { blocksWide++; }
<a name="l00136"></a>00136
<a name="l00137"></a>00137 <span class="keywordtype">int</span> blocksTall = editedImage->height() / BLOCK_SIZE;
<a name="l00138"></a>00138 <span class="keywordflow">if</span>(blocksTall*BLOCK_SIZE < editedImage-><a class="code" href="blur_8cpp.html#d12fc34ce789bce6c8a05d8a17138534">height</a>())
<a name="l00139"></a>00139 { blocksTall++; }
<a name="l00140"></a>00140
<a name="l00141"></a>00141 <span class="comment">//iterate over image say 100 times, we'll need to fix this outer loop to be smarter?</span>
<a name="l00142"></a>00142 <span class="keywordtype">int</span> bx,by,x,y;
<a name="l00143"></a>00143 <span class="keywordflow">for</span>(<span class="keywordtype">int</span> i=0; i<10; i++)
<a name="l00144"></a>00144 {
<a name="l00145"></a>00145 <span class="comment">//iterate over all blocks</span>
<a name="l00146"></a>00146 <span class="keywordflow">for</span>(bx=0; bx<blocksWide; bx++)
<a name="l00147"></a>00147 {
<a name="l00148"></a>00148 <span class="keywordflow">for</span>(by=0; by<blocksTall; by++)
<a name="l00149"></a>00149 {
<a name="l00150"></a>00150 <span class="comment">//pick random pixel within block</span>
<a name="l00151"></a>00151 <a class="code" href="pointillism_8cpp.html#3bcd2957d75fcb33f41acca28c8bbc63">pickRandomPixelWithinBlock</a>( editedImage->width(),
<a name="l00152"></a>00152 editedImage->height(),
<a name="l00153"></a>00153 bx, by,
<a name="l00154"></a>00154 BLOCK_SIZE,
<a name="l00155"></a>00155 x, y );
<a name="l00156"></a>00156
<a name="l00157"></a>00157 <span class="keywordtype">double</span> curGrayVal = <a class="code" href="pointillism_8cpp.html#3899ac9e3314758c9e2531f614675f37">computeLocalGrayVal</a>( editedImage, x, y );
<a name="l00158"></a>00158 <span class="keywordtype">double</span> goalGrayVal = <a class="code" href="pointillism_8cpp.html#3899ac9e3314758c9e2531f614675f37">computeLocalGrayVal</a>( originalImage, x, y );
<a name="l00159"></a>00159
<a name="l00160"></a>00160 <span class="comment">//too bright -> draw dot</span>
<a name="l00161"></a>00161 <span class="keywordflow">if</span>( curGrayVal > goalGrayVal )
<a name="l00162"></a>00162 { <a class="code" href="pointillism_8cpp.html#81f112ac02150cd015a661348261aa4a">drawDotAt</a>( editedImage, x, y, 5 ); }
<a name="l00163"></a>00163 }
<a name="l00164"></a>00164 }
<a name="l00165"></a>00165 }
<a name="l00166"></a>00166
<a name="l00167"></a>00167 <span class="comment">//free grayscale form of original image</span>
<a name="l00168"></a>00168 <span class="keyword">delete</span> originalImage;
<a name="l00169"></a>00169 originalImage = NULL;
<a name="l00170"></a>00170
<a name="l00171"></a>00171 <span class="comment">//return pointer to edited image</span>
<a name="l00172"></a>00172 <span class="keywordflow">return</span> editedImage;
<a name="l00173"></a>00173 }
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