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<h1>Source code for pyqtgraph.graphicsItems.HistogramLUTItem</h1><div class="highlight"><pre>
<span class="sd">"""</span>
<span class="sd">GraphicsWidget displaying an image histogram along with gradient editor. Can be used to adjust the appearance of images.</span>
<span class="sd">"""</span>
<span class="kn">from</span> <span class="nn">..Qt</span> <span class="kn">import</span> <span class="n">QtGui</span><span class="p">,</span> <span class="n">QtCore</span>
<span class="kn">from</span> <span class="nn">..</span> <span class="kn">import</span> <span class="n">functions</span> <span class="k">as</span> <span class="n">fn</span>
<span class="kn">from</span> <span class="nn">.GraphicsWidget</span> <span class="kn">import</span> <span class="n">GraphicsWidget</span>
<span class="kn">from</span> <span class="nn">.ViewBox</span> <span class="kn">import</span> <span class="o">*</span>
<span class="kn">from</span> <span class="nn">.GradientEditorItem</span> <span class="kn">import</span> <span class="o">*</span>
<span class="kn">from</span> <span class="nn">.LinearRegionItem</span> <span class="kn">import</span> <span class="o">*</span>
<span class="kn">from</span> <span class="nn">.PlotDataItem</span> <span class="kn">import</span> <span class="o">*</span>
<span class="kn">from</span> <span class="nn">.AxisItem</span> <span class="kn">import</span> <span class="o">*</span>
<span class="kn">from</span> <span class="nn">.GridItem</span> <span class="kn">import</span> <span class="o">*</span>
<span class="kn">from</span> <span class="nn">..Point</span> <span class="kn">import</span> <span class="n">Point</span>
<span class="kn">from</span> <span class="nn">..</span> <span class="kn">import</span> <span class="n">functions</span> <span class="k">as</span> <span class="n">fn</span>
<span class="kn">import</span> <span class="nn">numpy</span> <span class="kn">as</span> <span class="nn">np</span>
<span class="kn">from</span> <span class="nn">..</span> <span class="kn">import</span> <span class="n">debug</span> <span class="k">as</span> <span class="n">debug</span>
<span class="kn">import</span> <span class="nn">weakref</span>
<span class="n">__all__</span> <span class="o">=</span> <span class="p">[</span><span class="s">'HistogramLUTItem'</span><span class="p">]</span>
<div class="viewcode-block" id="HistogramLUTItem"><a class="viewcode-back" href="../../../graphicsItems/histogramlutitem.html#pyqtgraph.HistogramLUTItem">[docs]</a><span class="k">class</span> <span class="nc">HistogramLUTItem</span><span class="p">(</span><span class="n">GraphicsWidget</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> This is a graphicsWidget which provides controls for adjusting the display of an image.</span>
<span class="sd"> Includes:</span>
<span class="sd"> - Image histogram </span>
<span class="sd"> - Movable region over histogram to select black/white levels</span>
<span class="sd"> - Gradient editor to define color lookup table for single-channel images</span>
<span class="sd"> """</span>
<span class="n">sigLookupTableChanged</span> <span class="o">=</span> <span class="n">QtCore</span><span class="o">.</span><span class="n">Signal</span><span class="p">(</span><span class="nb">object</span><span class="p">)</span>
<span class="n">sigLevelsChanged</span> <span class="o">=</span> <span class="n">QtCore</span><span class="o">.</span><span class="n">Signal</span><span class="p">(</span><span class="nb">object</span><span class="p">)</span>
<span class="n">sigLevelChangeFinished</span> <span class="o">=</span> <span class="n">QtCore</span><span class="o">.</span><span class="n">Signal</span><span class="p">(</span><span class="nb">object</span><span class="p">)</span>
<div class="viewcode-block" id="HistogramLUTItem.__init__"><a class="viewcode-back" href="../../../graphicsItems/histogramlutitem.html#pyqtgraph.HistogramLUTItem.__init__">[docs]</a> <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="n">image</span><span class="o">=</span><span class="bp">None</span><span class="p">,</span> <span class="n">fillHistogram</span><span class="o">=</span><span class="bp">True</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> If *image* (ImageItem) is provided, then the control will be automatically linked to the image and changes to the control will be immediately reflected in the image's appearance.</span>
<span class="sd"> By default, the histogram is rendered with a fill. For performance, set *fillHistogram* = False.</span>
<span class="sd"> """</span>
<span class="n">GraphicsWidget</span><span class="o">.</span><span class="n">__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">lut</span> <span class="o">=</span> <span class="bp">None</span>
<span class="bp">self</span><span class="o">.</span><span class="n">imageItem</span> <span class="o">=</span> <span class="k">lambda</span><span class="p">:</span> <span class="bp">None</span> <span class="c"># fake a dead weakref</span>
<span class="bp">self</span><span class="o">.</span><span class="n">layout</span> <span class="o">=</span> <span class="n">QtGui</span><span class="o">.</span><span class="n">QGraphicsGridLayout</span><span class="p">()</span>
<span class="bp">self</span><span class="o">.</span><span class="n">setLayout</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">layout</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">layout</span><span class="o">.</span><span class="n">setContentsMargins</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span><span class="mi">1</span><span class="p">,</span><span class="mi">1</span><span class="p">,</span><span class="mi">1</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">layout</span><span class="o">.</span><span class="n">setSpacing</span><span class="p">(</span><span class="mi">0</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">vb</span> <span class="o">=</span> <span class="n">ViewBox</span><span class="p">(</span><span class="n">parent</span><span class="o">=</span><span class="bp">self</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">vb</span><span class="o">.</span><span class="n">setMaximumWidth</span><span class="p">(</span><span class="mi">152</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">vb</span><span class="o">.</span><span class="n">setMinimumWidth</span><span class="p">(</span><span class="mi">45</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">vb</span><span class="o">.</span><span class="n">setMouseEnabled</span><span class="p">(</span><span class="n">x</span><span class="o">=</span><span class="bp">False</span><span class="p">,</span> <span class="n">y</span><span class="o">=</span><span class="bp">True</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">gradient</span> <span class="o">=</span> <span class="n">GradientEditorItem</span><span class="p">()</span>
<span class="bp">self</span><span class="o">.</span><span class="n">gradient</span><span class="o">.</span><span class="n">setOrientation</span><span class="p">(</span><span class="s">'right'</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">gradient</span><span class="o">.</span><span class="n">loadPreset</span><span class="p">(</span><span class="s">'grey'</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">region</span> <span class="o">=</span> <span class="n">LinearRegionItem</span><span class="p">([</span><span class="mi">0</span><span class="p">,</span> <span class="mi">1</span><span class="p">],</span> <span class="n">LinearRegionItem</span><span class="o">.</span><span class="n">Horizontal</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">region</span><span class="o">.</span><span class="n">setZValue</span><span class="p">(</span><span class="mi">1000</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">vb</span><span class="o">.</span><span class="n">addItem</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">region</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">axis</span> <span class="o">=</span> <span class="n">AxisItem</span><span class="p">(</span><span class="s">'left'</span><span class="p">,</span> <span class="n">linkView</span><span class="o">=</span><span class="bp">self</span><span class="o">.</span><span class="n">vb</span><span class="p">,</span> <span class="n">maxTickLength</span><span class="o">=-</span><span class="mi">10</span><span class="p">,</span> <span class="n">parent</span><span class="o">=</span><span class="bp">self</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">layout</span><span class="o">.</span><span class="n">addItem</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">axis</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">0</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">layout</span><span class="o">.</span><span class="n">addItem</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">vb</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">1</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">layout</span><span class="o">.</span><span class="n">addItem</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">gradient</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">2</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">range</span> <span class="o">=</span> <span class="bp">None</span>
<span class="bp">self</span><span class="o">.</span><span class="n">gradient</span><span class="o">.</span><span class="n">setFlag</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">gradient</span><span class="o">.</span><span class="n">ItemStacksBehindParent</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">vb</span><span class="o">.</span><span class="n">setFlag</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">gradient</span><span class="o">.</span><span class="n">ItemStacksBehindParent</span><span class="p">)</span>
<span class="c">#self.grid = GridItem()</span>
<span class="c">#self.vb.addItem(self.grid)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">gradient</span><span class="o">.</span><span class="n">sigGradientChanged</span><span class="o">.</span><span class="n">connect</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">gradientChanged</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">region</span><span class="o">.</span><span class="n">sigRegionChanged</span><span class="o">.</span><span class="n">connect</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">regionChanging</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">region</span><span class="o">.</span><span class="n">sigRegionChangeFinished</span><span class="o">.</span><span class="n">connect</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">regionChanged</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">vb</span><span class="o">.</span><span class="n">sigRangeChanged</span><span class="o">.</span><span class="n">connect</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">viewRangeChanged</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">plot</span> <span class="o">=</span> <span class="n">PlotDataItem</span><span class="p">()</span>
<span class="bp">self</span><span class="o">.</span><span class="n">plot</span><span class="o">.</span><span class="n">rotate</span><span class="p">(</span><span class="mi">90</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">fillHistogram</span><span class="p">(</span><span class="n">fillHistogram</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">vb</span><span class="o">.</span><span class="n">addItem</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">plot</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">autoHistogramRange</span><span class="p">()</span>
<span class="k">if</span> <span class="n">image</span> <span class="ow">is</span> <span class="ow">not</span> <span class="bp">None</span><span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">setImageItem</span><span class="p">(</span><span class="n">image</span><span class="p">)</span></div>
<span class="c">#self.setSizePolicy(QtGui.QSizePolicy.Preferred, QtGui.QSizePolicy.Expanding)</span>
<span class="k">def</span> <span class="nf">fillHistogram</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">fill</span><span class="o">=</span><span class="bp">True</span><span class="p">,</span> <span class="n">level</span><span class="o">=</span><span class="mf">0.0</span><span class="p">,</span> <span class="n">color</span><span class="o">=</span><span class="p">(</span><span class="mi">100</span><span class="p">,</span> <span class="mi">100</span><span class="p">,</span> <span class="mi">200</span><span class="p">)):</span>
<span class="k">if</span> <span class="n">fill</span><span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">plot</span><span class="o">.</span><span class="n">setFillLevel</span><span class="p">(</span><span class="n">level</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">plot</span><span class="o">.</span><span class="n">setFillBrush</span><span class="p">(</span><span class="n">color</span><span class="p">)</span>
<span class="k">else</span><span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">plot</span><span class="o">.</span><span class="n">setFillLevel</span><span class="p">(</span><span class="bp">None</span><span class="p">)</span>
<span class="c">#def sizeHint(self, *args):</span>
<span class="c">#return QtCore.QSizeF(115, 200)</span>
<span class="k">def</span> <span class="nf">paint</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">p</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">):</span>
<span class="n">pen</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">region</span><span class="o">.</span><span class="n">lines</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span><span class="o">.</span><span class="n">pen</span>
<span class="n">rgn</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">getLevels</span><span class="p">()</span>
<span class="n">p1</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">vb</span><span class="o">.</span><span class="n">mapFromViewToItem</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">Point</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">vb</span><span class="o">.</span><span class="n">viewRect</span><span class="p">()</span><span class="o">.</span><span class="n">center</span><span class="p">()</span><span class="o">.</span><span class="n">x</span><span class="p">(),</span> <span class="n">rgn</span><span class="p">[</span><span class="mi">0</span><span class="p">]))</span>
<span class="n">p2</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">vb</span><span class="o">.</span><span class="n">mapFromViewToItem</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">Point</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">vb</span><span class="o">.</span><span class="n">viewRect</span><span class="p">()</span><span class="o">.</span><span class="n">center</span><span class="p">()</span><span class="o">.</span><span class="n">x</span><span class="p">(),</span> <span class="n">rgn</span><span class="p">[</span><span class="mi">1</span><span class="p">]))</span>
<span class="n">gradRect</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">gradient</span><span class="o">.</span><span class="n">mapRectToParent</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">gradient</span><span class="o">.</span><span class="n">gradRect</span><span class="o">.</span><span class="n">rect</span><span class="p">())</span>
<span class="k">for</span> <span class="n">pen</span> <span class="ow">in</span> <span class="p">[</span><span class="n">fn</span><span class="o">.</span><span class="n">mkPen</span><span class="p">(</span><span class="s">'k'</span><span class="p">,</span> <span class="n">width</span><span class="o">=</span><span class="mi">3</span><span class="p">),</span> <span class="n">pen</span><span class="p">]:</span>
<span class="n">p</span><span class="o">.</span><span class="n">setPen</span><span class="p">(</span><span class="n">pen</span><span class="p">)</span>
<span class="n">p</span><span class="o">.</span><span class="n">drawLine</span><span class="p">(</span><span class="n">p1</span><span class="p">,</span> <span class="n">gradRect</span><span class="o">.</span><span class="n">bottomLeft</span><span class="p">())</span>
<span class="n">p</span><span class="o">.</span><span class="n">drawLine</span><span class="p">(</span><span class="n">p2</span><span class="p">,</span> <span class="n">gradRect</span><span class="o">.</span><span class="n">topLeft</span><span class="p">())</span>
<span class="n">p</span><span class="o">.</span><span class="n">drawLine</span><span class="p">(</span><span class="n">gradRect</span><span class="o">.</span><span class="n">topLeft</span><span class="p">(),</span> <span class="n">gradRect</span><span class="o">.</span><span class="n">topRight</span><span class="p">())</span>
<span class="n">p</span><span class="o">.</span><span class="n">drawLine</span><span class="p">(</span><span class="n">gradRect</span><span class="o">.</span><span class="n">bottomLeft</span><span class="p">(),</span> <span class="n">gradRect</span><span class="o">.</span><span class="n">bottomRight</span><span class="p">())</span>
<span class="c">#p.drawRect(self.boundingRect())</span>
<div class="viewcode-block" id="HistogramLUTItem.setHistogramRange"><a class="viewcode-back" href="../../../graphicsItems/histogramlutitem.html#pyqtgraph.HistogramLUTItem.setHistogramRange">[docs]</a> <span class="k">def</span> <span class="nf">setHistogramRange</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">mn</span><span class="p">,</span> <span class="n">mx</span><span class="p">,</span> <span class="n">padding</span><span class="o">=</span><span class="mf">0.1</span><span class="p">):</span>
<span class="sd">"""Set the Y range on the histogram plot. This disables auto-scaling."""</span>
<span class="bp">self</span><span class="o">.</span><span class="n">vb</span><span class="o">.</span><span class="n">enableAutoRange</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">vb</span><span class="o">.</span><span class="n">YAxis</span><span class="p">,</span> <span class="bp">False</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">vb</span><span class="o">.</span><span class="n">setYRange</span><span class="p">(</span><span class="n">mn</span><span class="p">,</span> <span class="n">mx</span><span class="p">,</span> <span class="n">padding</span><span class="p">)</span></div>
<span class="c">#d = mx-mn</span>
<span class="c">#mn -= d*padding</span>
<span class="c">#mx += d*padding</span>
<span class="c">#self.range = [mn,mx]</span>
<span class="c">#self.updateRange()</span>
<span class="c">#self.vb.setMouseEnabled(False, True)</span>
<span class="c">#self.region.setBounds([mn,mx])</span>
<div class="viewcode-block" id="HistogramLUTItem.autoHistogramRange"><a class="viewcode-back" href="../../../graphicsItems/histogramlutitem.html#pyqtgraph.HistogramLUTItem.autoHistogramRange">[docs]</a> <span class="k">def</span> <span class="nf">autoHistogramRange</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="sd">"""Enable auto-scaling on the histogram plot."""</span>
<span class="bp">self</span><span class="o">.</span><span class="n">vb</span><span class="o">.</span><span class="n">enableAutoRange</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">vb</span><span class="o">.</span><span class="n">XYAxes</span><span class="p">)</span></div>
<span class="c">#self.range = None</span>
<span class="c">#self.updateRange()</span>
<span class="c">#self.vb.setMouseEnabled(False, False)</span>
<span class="c">#def updateRange(self):</span>
<span class="c">#self.vb.autoRange()</span>
<span class="c">#if self.range is not None:</span>
<span class="c">#self.vb.setYRange(*self.range)</span>
<span class="c">#vr = self.vb.viewRect()</span>
<span class="c">#self.region.setBounds([vr.top(), vr.bottom()])</span>
<span class="k">def</span> <span class="nf">setImageItem</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">img</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">imageItem</span> <span class="o">=</span> <span class="n">weakref</span><span class="o">.</span><span class="n">ref</span><span class="p">(</span><span class="n">img</span><span class="p">)</span>
<span class="n">img</span><span class="o">.</span><span class="n">sigImageChanged</span><span class="o">.</span><span class="n">connect</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">imageChanged</span><span class="p">)</span>
<span class="n">img</span><span class="o">.</span><span class="n">setLookupTable</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">getLookupTable</span><span class="p">)</span> <span class="c">## send function pointer, not the result</span>
<span class="c">#self.gradientChanged()</span>
<span class="bp">self</span><span class="o">.</span><span class="n">regionChanged</span><span class="p">()</span>
<span class="bp">self</span><span class="o">.</span><span class="n">imageChanged</span><span class="p">(</span><span class="n">autoLevel</span><span class="o">=</span><span class="bp">True</span><span class="p">)</span>
<span class="c">#self.vb.autoRange()</span>
<span class="k">def</span> <span class="nf">viewRangeChanged</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">update</span><span class="p">()</span>
<span class="k">def</span> <span class="nf">gradientChanged</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">imageItem</span><span class="p">()</span> <span class="ow">is</span> <span class="ow">not</span> <span class="bp">None</span><span class="p">:</span>
<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">gradient</span><span class="o">.</span><span class="n">isLookupTrivial</span><span class="p">():</span>
<span class="bp">self</span><span class="o">.</span><span class="n">imageItem</span><span class="p">()</span><span class="o">.</span><span class="n">setLookupTable</span><span class="p">(</span><span class="bp">None</span><span class="p">)</span> <span class="c">#lambda x: x.astype(np.uint8))</span>
<span class="k">else</span><span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">imageItem</span><span class="p">()</span><span class="o">.</span><span class="n">setLookupTable</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">getLookupTable</span><span class="p">)</span> <span class="c">## send function pointer, not the result</span>
<span class="bp">self</span><span class="o">.</span><span class="n">lut</span> <span class="o">=</span> <span class="bp">None</span>
<span class="c">#if self.imageItem is not None:</span>
<span class="c">#self.imageItem.setLookupTable(self.gradient.getLookupTable(512))</span>
<span class="bp">self</span><span class="o">.</span><span class="n">sigLookupTableChanged</span><span class="o">.</span><span class="n">emit</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">getLookupTable</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">img</span><span class="o">=</span><span class="bp">None</span><span class="p">,</span> <span class="n">n</span><span class="o">=</span><span class="bp">None</span><span class="p">,</span> <span class="n">alpha</span><span class="o">=</span><span class="bp">None</span><span class="p">):</span>
<span class="k">if</span> <span class="n">n</span> <span class="ow">is</span> <span class="bp">None</span><span class="p">:</span>
<span class="k">if</span> <span class="n">img</span><span class="o">.</span><span class="n">dtype</span> <span class="o">==</span> <span class="n">np</span><span class="o">.</span><span class="n">uint8</span><span class="p">:</span>
<span class="n">n</span> <span class="o">=</span> <span class="mi">256</span>
<span class="k">else</span><span class="p">:</span>
<span class="n">n</span> <span class="o">=</span> <span class="mi">512</span>
<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">lut</span> <span class="ow">is</span> <span class="bp">None</span><span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">lut</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">gradient</span><span class="o">.</span><span class="n">getLookupTable</span><span class="p">(</span><span class="n">n</span><span class="p">,</span> <span class="n">alpha</span><span class="o">=</span><span class="n">alpha</span><span class="p">)</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">lut</span>
<span class="k">def</span> <span class="nf">regionChanged</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="c">#if self.imageItem is not None:</span>
<span class="c">#self.imageItem.setLevels(self.region.getRegion())</span>
<span class="bp">self</span><span class="o">.</span><span class="n">sigLevelChangeFinished</span><span class="o">.</span><span class="n">emit</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span>
<span class="c">#self.update()</span>
<span class="k">def</span> <span class="nf">regionChanging</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">imageItem</span><span class="p">()</span> <span class="ow">is</span> <span class="ow">not</span> <span class="bp">None</span><span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">imageItem</span><span class="p">()</span><span class="o">.</span><span class="n">setLevels</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">region</span><span class="o">.</span><span class="n">getRegion</span><span class="p">())</span>
<span class="bp">self</span><span class="o">.</span><span class="n">sigLevelsChanged</span><span class="o">.</span><span class="n">emit</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">update</span><span class="p">()</span>
<span class="k">def</span> <span class="nf">imageChanged</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">autoLevel</span><span class="o">=</span><span class="bp">False</span><span class="p">,</span> <span class="n">autoRange</span><span class="o">=</span><span class="bp">False</span><span class="p">):</span>
<span class="n">profiler</span> <span class="o">=</span> <span class="n">debug</span><span class="o">.</span><span class="n">Profiler</span><span class="p">()</span>
<span class="n">h</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">imageItem</span><span class="p">()</span><span class="o">.</span><span class="n">getHistogram</span><span class="p">()</span>
<span class="n">profiler</span><span class="p">(</span><span class="s">'get histogram'</span><span class="p">)</span>
<span class="k">if</span> <span class="n">h</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span> <span class="ow">is</span> <span class="bp">None</span><span class="p">:</span>
<span class="k">return</span>
<span class="bp">self</span><span class="o">.</span><span class="n">plot</span><span class="o">.</span><span class="n">setData</span><span class="p">(</span><span class="o">*</span><span class="n">h</span><span class="p">)</span>
<span class="n">profiler</span><span class="p">(</span><span class="s">'set plot'</span><span class="p">)</span>
<span class="k">if</span> <span class="n">autoLevel</span><span class="p">:</span>
<span class="n">mn</span> <span class="o">=</span> <span class="n">h</span><span class="p">[</span><span class="mi">0</span><span class="p">][</span><span class="mi">0</span><span class="p">]</span>
<span class="n">mx</span> <span class="o">=</span> <span class="n">h</span><span class="p">[</span><span class="mi">0</span><span class="p">][</span><span class="o">-</span><span class="mi">1</span><span class="p">]</span>
<span class="bp">self</span><span class="o">.</span><span class="n">region</span><span class="o">.</span><span class="n">setRegion</span><span class="p">([</span><span class="n">mn</span><span class="p">,</span> <span class="n">mx</span><span class="p">])</span>
<span class="n">profiler</span><span class="p">(</span><span class="s">'set region'</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">getLevels</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">region</span><span class="o">.</span><span class="n">getRegion</span><span class="p">()</span>
<span class="k">def</span> <span class="nf">setLevels</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">mn</span><span class="p">,</span> <span class="n">mx</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">region</span><span class="o">.</span><span class="n">setRegion</span><span class="p">([</span><span class="n">mn</span><span class="p">,</span> <span class="n">mx</span><span class="p">])</span></div>
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