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<h1>Source code for selection</h1><div class="highlight"><pre>
<span></span><span class="ch">#!/usr/bin/python2.7</span>
<span class="c1"># -*- coding: utf-8 -*-</span>
<span class="sd">"""</span>
<span class="sd">**Project Name:** MakeHuman</span>
<span class="sd">**Product Home Page:** http://www.makehuman.org/</span>
<span class="sd">**Code Home Page:** https://bitbucket.org/MakeHuman/makehuman/</span>
<span class="sd">**Authors:** Glynn Clements</span>
<span class="sd">**Copyright(c):** MakeHuman Team 2001-2017</span>
<span class="sd">**Licensing:** AGPL3</span>
<span class="sd"> This file is part of MakeHuman (www.makehuman.org).</span>
<span class="sd"> This program is free software: you can redistribute it and/or modify</span>
<span class="sd"> it under the terms of the GNU Affero General Public License as</span>
<span class="sd"> published by the Free Software Foundation, either version 3 of the</span>
<span class="sd"> License, or (at your option) any later version.</span>
<span class="sd"> This program is distributed in the hope that it will be useful,</span>
<span class="sd"> but WITHOUT ANY WARRANTY; without even the implied warranty of</span>
<span class="sd"> MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the</span>
<span class="sd"> GNU Affero General Public License for more details.</span>
<span class="sd"> You should have received a copy of the GNU Affero General Public License</span>
<span class="sd"> along with this program. If not, see <http://www.gnu.org/licenses/>.</span>
<span class="sd">Abstract</span>
<span class="sd">--------</span>
<span class="sd">TODO</span>
<span class="sd">"""</span>
<div class="viewcode-block" id="SelectionColorMap"><a class="viewcode-back" href="../module_selection.html#selection.SelectionColorMap">[docs]</a><span class="k">class</span> <span class="nc">SelectionColorMap</span><span class="p">:</span>
<span class="sd">"""</span>
<span class="sd"> The objects support the use of a technique called *Selection Using Unique</span>
<span class="sd"> Color IDs*, that internally uses color-coding of components within the</span>
<span class="sd"> scene to support the selection of objects by the user using the mouse.</span>
<span class="sd"> This technique generates a sequence of colors (color IDs), assigning a</span>
<span class="sd"> unique color to each uniquely selectable object or component in the scene.</span>
<span class="sd"> These colors are not displayed, but are used by MakeHuman to generates an</span>
<span class="sd"> unseen image of the various selectable elements. This image uses the same</span>
<span class="sd"> camera settings currently being used for the actual, on-screen image.</span>
<span class="sd"> When the mouse is clicked, the position of the mouse is used with the</span>
<span class="sd"> unseen image to retrieve a color. MakeHuman uses this color as an ID to</span>
<span class="sd"> identify which object or component the user clicked with the mouse.</span>
<span class="sd"> This technique uses glReadPixels() to read the single pixel at the</span>
<span class="sd"> current mouse location, using the unseen, color-coded image.</span>
<span class="sd"> For further information on this technique, see:</span>
<span class="sd"> - http://www.opengl.org/resources/faq/technical/selection.htm and</span>
<span class="sd"> - http://wiki.gamedev.net/index.php/OpenGL_Selection_Using_Unique_Color_IDs</span>
<span class="sd"> **Note.** Because the 3D engine uses glDrawElements in a highly opimized</span>
<span class="sd"> way and each vertex can have only one color ID, there there is a known</span>
<span class="sd"> problem with selecting individual faces with very small FaceGroups using</span>
<span class="sd"> this technique. However, this is not a major problem for MakeHuman, which</span>
<span class="sd"> doesn't use such low polygon groupings.</span>
<span class="sd"> </span>
<span class="sd"> - **self.colorIDToFaceGroup**: *Dictionary of colors IDs* A dictionary of the color IDs used for</span>
<span class="sd"> selection (see MakeHuman Selectors, above).</span>
<span class="sd"> - **self.colorID**: *float list* A progressive color ID.</span>
<span class="sd"> </span>
<span class="sd"> The attributes *self.colorID* and *self.colorIDToFaceGroup*</span>
<span class="sd"> support a technique called *Selection Using Unique Color IDs* to make each</span>
<span class="sd"> FaceGroup independently clickable.</span>
<span class="sd"> The attribute *self.colorID* stores a progressive color that is incremented for each successive</span>
<span class="sd"> FaceGroup added to the scene.</span>
<span class="sd"> The *self.colorIDToFaceGroup* attribute contains a list that serves as a directory to map</span>
<span class="sd"> each color back to the corresponding FaceGroup by using its color ID.</span>
<span class="sd"> """</span>
<span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">colorIDToFaceGroup</span> <span class="o">=</span> <span class="p">{}</span>
<span class="bp">self</span><span class="o">.</span><span class="n">colorID</span> <span class="o">=</span> <span class="mi">0</span>
<div class="viewcode-block" id="SelectionColorMap.assignSelectionID"><a class="viewcode-back" href="../module_selection.html#selection.SelectionColorMap.assignSelectionID">[docs]</a> <span class="k">def</span> <span class="nf">assignSelectionID</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">obj</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> This method generates a new, unique color ID for each FaceGroup,</span>
<span class="sd"> within a particular Object3D object, that forms a part of this scene3D</span>
<span class="sd"> object. This color ID can subsequently be used in a non-displayed</span>
<span class="sd"> image map to determine the FaceGroup that a mouse click was made in.</span>
<span class="sd"> This method loops through the FaceGroups, assigning the next color</span>
<span class="sd"> in the sequence to each subsequent FaceGroup. The color value is</span>
<span class="sd"> written into a 'dictionary' to serve as a color ID that can be</span>
<span class="sd"> translated back into the corresponding FaceGroup name when a mouse</span>
<span class="sd"> click is detected.</span>
<span class="sd"> This is part of a technique called *Selection Using Unique Color IDs*</span>
<span class="sd"> to make each FaceGroup independently clickable.</span>
<span class="sd"> :param obj: The object3D object for which color dictionary entries need to be generated.</span>
<span class="sd"> :type obj: module3d.Object 3D</span>
<span class="sd"> """</span>
<span class="k">for</span> <span class="n">g</span> <span class="ow">in</span> <span class="n">obj</span><span class="o">.</span><span class="n">faceGroups</span><span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">colorID</span> <span class="o">+=</span> <span class="mi">1</span>
<span class="c1"># 555 to 24-bit rgb</span>
<span class="n">idR</span> <span class="o">=</span> <span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">colorID</span> <span class="o">%</span> <span class="mi">32</span><span class="p">)</span> <span class="o">*</span> <span class="mi">8</span>
<span class="n">idG</span> <span class="o">=</span> <span class="p">((</span><span class="bp">self</span><span class="o">.</span><span class="n">colorID</span> <span class="o">>></span> <span class="mi">5</span><span class="p">)</span> <span class="o">%</span> <span class="mi">32</span><span class="p">)</span> <span class="o">*</span> <span class="mi">8</span>
<span class="n">idB</span> <span class="o">=</span> <span class="p">((</span><span class="bp">self</span><span class="o">.</span><span class="n">colorID</span> <span class="o">>></span> <span class="mi">10</span><span class="p">)</span> <span class="o">%</span> <span class="mi">32</span><span class="p">)</span> <span class="o">*</span> <span class="mi">8</span>
<span class="n">g</span><span class="o">.</span><span class="n">colorID</span> <span class="o">=</span> <span class="p">(</span><span class="n">idR</span><span class="p">,</span> <span class="n">idG</span><span class="p">,</span> <span class="n">idB</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">colorIDToFaceGroup</span><span class="p">[</span><span class="bp">self</span><span class="o">.</span><span class="n">colorID</span><span class="p">]</span> <span class="o">=</span> <span class="n">g</span></div>
<span class="c1"># import log</span>
<span class="c1"># log.debug("SELECTION DEBUG INFO: facegroup %s of obj %s has the colorID = %s,%s,%s or %s", g.name,obj.name,idR,idG,idB, self.colorID)</span>
<div class="viewcode-block" id="SelectionColorMap.getSelectedFaceGroup"><a class="viewcode-back" href="../module_selection.html#selection.SelectionColorMap.getSelectedFaceGroup">[docs]</a> <span class="k">def</span> <span class="nf">getSelectedFaceGroup</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">picked</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> This method uses a non-displayed image containing color-coded faces</span>
<span class="sd"> to return the index of the FaceGroup selected by the user with the mouse.</span>
<span class="sd"> This is part of a technique called *Selection Using Unique Color IDs* to make each</span>
<span class="sd"> FaceGroup independently clickable.</span>
<span class="sd"> :return: The selected face group.</span>
<span class="sd"> :rtype: :py:class:`module3d.FaceGroup`</span>
<span class="sd"> """</span>
<span class="n">IDkey</span> <span class="o">=</span> <span class="n">picked</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span> <span class="o">/</span> <span class="mi">8</span> <span class="o">|</span> <span class="n">picked</span><span class="p">[</span><span class="mi">1</span><span class="p">]</span> <span class="o">/</span> <span class="mi">8</span> <span class="o"><<</span> <span class="mi">5</span> <span class="o">|</span> <span class="n">picked</span><span class="p">[</span><span class="mi">2</span><span class="p">]</span> <span class="o">/</span> <span class="mi">8</span> <span class="o"><<</span> <span class="mi">10</span> <span class="c1"># 555</span>
<span class="c1"># print "DEBUG COLOR PICKED: %s,%s,%s %s"%(picked[0], picked[1], picked[2], IDkey)</span>
<span class="k">try</span><span class="p">:</span>
<span class="n">groupSelected</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">colorIDToFaceGroup</span><span class="p">[</span><span class="n">IDkey</span><span class="p">]</span>
<span class="k">except</span><span class="p">:</span>
<span class="c1"># print groupSelected.name</span>
<span class="c1">#this print should only come on while debugging color picking</span>
<span class="c1">#print 'Color %s (%s) not found' % (IDkey, picked)</span>
<span class="n">groupSelected</span> <span class="o">=</span> <span class="kc">None</span>
<span class="k">return</span> <span class="n">groupSelected</span></div>
<div class="viewcode-block" id="SelectionColorMap.getSelectedFaceGroupAndObject"><a class="viewcode-back" href="../module_selection.html#selection.SelectionColorMap.getSelectedFaceGroupAndObject">[docs]</a> <span class="k">def</span> <span class="nf">getSelectedFaceGroupAndObject</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">picked</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> This method determines whether a FaceGroup or a non-selectable zone has been</span>
<span class="sd"> clicked with the mouse. It returns a tuple, showing the FaceGroup and the parent</span>
<span class="sd"> Object3D object, or None.</span>
<span class="sd"> If no object is picked, this method will simply print \"no clickable zone.\"</span>
<span class="sd"> :return: The selected face group and object.</span>
<span class="sd"> :rtype: (:py:class:`module3d.FaceGroup`, :py:class:`module3d.Object3d`)</span>
<span class="sd"> """</span>
<span class="n">facegroupPicked</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">getSelectedFaceGroup</span><span class="p">(</span><span class="n">picked</span><span class="p">)</span>
<span class="k">if</span> <span class="n">facegroupPicked</span><span class="p">:</span>
<span class="n">objPicked</span> <span class="o">=</span> <span class="n">facegroupPicked</span><span class="o">.</span><span class="n">parent</span>
<span class="k">return</span> <span class="p">(</span><span class="n">facegroupPicked</span><span class="p">,</span> <span class="n">objPicked</span><span class="p">)</span>
<span class="k">else</span><span class="p">:</span>
<span class="c1">#this print should only be made while debugging picking</span>
<span class="c1">#print 'not a clickable zone'</span>
<span class="k">return</span> <span class="kc">None</span></div></div>
<span class="n">selectionColorMap</span> <span class="o">=</span> <span class="n">SelectionColorMap</span><span class="p">()</span>
</pre></div>
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