text: /******************************************************************************
  
    This source file is part of the tomviz project.
  
    Copyright Kitware, Inc.
  
    This source code is released under the New BSD License, (the "License").
  
    Unless required by applicable law or agreed to in writing, software
    distributed under the License is distributed on an "AS IS" BASIS,
    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    See the License for the specific language governing permissions and
    limitations under the License.
  
  ******************************************************************************/
  #ifndef tomvizvtkChartHistogramColorOpacityEditor_h
  #define tomvizvtkChartHistogramColorOpacityEditor_h
  
  #include <vtkAbstractContextItem.h>
  #include <vtkNew.h>
  
  class vtkAxis;
  class vtkChartHistogram;
  class vtkChartXY;
  class vtkColorTransferControlPointsItem;
  class vtkColorTransferFunction;
  class vtkColorTransferFunctionItem;
  class vtkPiecewiseFunction;
  class vtkScalarsToColors;
  class vtkTable;
  
  // This class is a chart that combines a histogram from a data set
  // a color bar editor, and an opacity editor.
  class vtkChartHistogramColorOpacityEditor : public vtkAbstractContextItem
  {
  public:
    vtkTypeMacro(vtkChartHistogramColorOpacityEditor, vtkAbstractContextItem)
    static vtkChartHistogramColorOpacityEditor * New();
  
    // Set the input data.
    void SetHistogramInputData(vtkTable* table,
                               const char* xAxisColumn,
                               const char* yAxisColumn);
  
    // Set the lookup table.
    void SetColorTransferFunction(vtkColorTransferFunction* lut);
  
    // Enable or disable scalar visibility.
    virtual void SetScalarVisibility(bool visible);
    virtual void ScalarVisibilityOn();
    virtual void ScalarVisibilityOff();
  
    // Set the name of the array by which the histogram should be colored.
    virtual void SelectColorArray(const char* arrayName);
  
    // Set the opacity function.
    virtual void SetOpacityFunction(vtkPiecewiseFunction* opacityFunction);
  
    // Get an axis from the histogram chart.
    vtkAxis* GetHistogramAxis(int axis);
  
    // Get the color of the current color control point. Returns true if there
    // is a currently selected control point, false otherwise.
    bool GetCurrentControlPointColor(double rgb[3]);
  
    // Set the color of the current color control point.
    void SetCurrentControlPointColor(const double rgb[3]);
  
    // Get the current contour value
    double GetContourValue();
  
    // Paint event for the editor.
    virtual bool Paint(vtkContext2D* painter);
  
  protected:
    // This provides the histogram, contour value marker, and opacity editor.
    vtkNew<vtkChartHistogram> HistogramChart;
  
    // This is used for the color transfer function editor.
    vtkNew<vtkChartXY> ColorTransferFunctionChart;
  
    // Controls for color transfer function editor.
    vtkNew<vtkColorTransferControlPointsItem> ColorTransferControlPointsItem;
  
    // Display of color transfer function.
    vtkNew<vtkColorTransferFunctionItem> ColorTransferFunctionItem;
  
  private:
    vtkChartHistogramColorOpacityEditor();
    virtual ~vtkChartHistogramColorOpacityEditor();
  
    class PIMPL;
    PIMPL *Private;
  
    float Borders[4];
  };
  
  #endif // tomvizvtkChartHistogramColorOpacityEditor_h
  