Esempio n. 1
0
        // Function: Calculate en render Histogram in window
        public void renderHistogram(vtk.vtkImageData VoxelData)
        {
            // Get size of histogram window
            int[] size = renHist.GetSize();
            width = size[0]; height = size[1];


            //Setup parameters histogram Accumulate Filter
            numBins    = width / 2;
            inputRange = VoxelData.GetScalarRange();
            double origin  = inputRange[0];
            double spacing = 1.0 * (inputRange[1] - origin) / numBins;

            // Setup Accumulate filter
            vtk.vtkImageAccumulate accumulate = new vtk.vtkImageAccumulate();
            accumulate.SetInput(VoxelData); //Get input voxeldata
            accumulate.SetComponentExtent(0, numBins - 1, 0, 0, 0, 0);
            accumulate.SetComponentOrigin(origin, 0.0, 0.0);
            accumulate.SetComponentSpacing(spacing, 1.0, 1.0);

            // Make Data object from Accumulated object
            data = accumulate.GetOutput();
            data.Update();

            // Initialize first and last point of the transferfunction.
            npoints    = 2;
            pointsx[0] = 0; pointsy[0] = 0;
            pointsx[1] = width - 1; pointsy[1] = height - 1;
            pointsc[0] = 1; pointsc[1] = 1;

            // Draw the histogram in a canvas and add the transferfunction to it
            drawhisto();
            drawcurve();

            // Create a color table
            vtk.vtkColorTransferFunction colorTransferFunction = new vtk.vtkColorTransferFunction();
            for (int i = 0; i < 14; i++)
            {
                colorTransferFunction.AddRGBPoint(i, colortable[i, 0], colortable[i, 1], colortable[i, 2]);
            }



            // Use the color table to color the histogram window objects
            vtk.vtkImageMapToColors sColors = new vtk.vtkImageMapToColors();
            sColors.SetInputConnection(canvas.GetOutputPort());
            sColors.SetLookupTable(colorTransferFunction);

            // Convert the histogram image to a histogram imagemap
            vtk.vtkImageMapper histmap = new vtk.vtkImageMapper();
            histmap.SetInputConnection(sColors.GetOutputPort());
            histmap.RenderToRectangleOn();
            histmap.SetColorWindow(256);
            histmap.SetColorLevel(127);

            // Create the actor needed to draw the histogram image
            vtk.vtkActor2D imageactor = new vtk.vtkActor2D();
            imageactor.SetMapper(histmap);
            imageactor.SetPosition(0, 0); // Fit the histogram to the window
            imageactor.SetPosition2(1, 1);

            // Add the Histogram Image Render to the window object
            ren1.AddActor(imageactor);
            ren1.SetViewport(0, 0, 1, 1); // Fit the histogram to the window
            renHist.AddRenderer(ren1);

            // Add a Window (mouse) interactor to the window
            iren.SetRenderWindow(renHist);

            // Add mouse events to the window
            iren.RemoveObserver((uint)vtk.EventIds.LeftButtonPressEvent);
            iren.AddObserver((uint)vtk.EventIds.LeftButtonPressEvent, new vtk.vtkDotNetCallback(LeftButtonPress));

            iren.RemoveObserver((uint)vtk.EventIds.LeftButtonReleaseEvent);
            iren.AddObserver((uint)vtk.EventIds.LeftButtonReleaseEvent, new vtk.vtkDotNetCallback(LeftButtonRelease));

            iren.RemoveObserver((uint)vtk.EventIds.MouseMoveEvent);
            iren.AddObserver((uint)vtk.EventIds.MouseMoveEvent, new vtk.vtkDotNetCallback(MouseMove));

            iren.RemoveObserver((uint)vtk.EventIds.RightButtonPressEvent);
            iren.AddObserver((uint)vtk.EventIds.RightButtonPressEvent, new vtk.vtkDotNetCallback(RightButtonPress));

            iren.RemoveObserver((uint)vtk.EventIds.MiddleButtonPressEvent);
            iren.AddObserver((uint)vtk.EventIds.MiddleButtonPressEvent, new vtk.vtkDotNetCallback(MiddleButtonPress));

            // Set the (display) update rate of the histogram
            iren.SetStillUpdateRate(5);
            iren.SetDesiredUpdateRate(5);

            // Initialize interactor and render histogram
            iren.Initialize();
            renHist.Render();

            // Debug output
            info = "Histogram is created \r\n";
        }