public StreamLinesSample()
{
InitializeComponent();
// We will set the tube path position color based on the Density
string colorColumnName = "Density"; // "AngularVelocity"
bool invertColorValue = false; // This needs to be set to true when using AngularVelocity
// First create a gradient legend and texture
var gradientStopCollection = new GradientStopCollection();
gradientStopCollection.Add(new GradientStop(Colors.Red, 1));
gradientStopCollection.Add(new GradientStop(Colors.Yellow, 0.75));
gradientStopCollection.Add(new GradientStop(Colors.Lime, 0.5));
gradientStopCollection.Add(new GradientStop(Colors.Aqua, 0.25));
gradientStopCollection.Add(new GradientStop(Colors.Blue, 0));
var linearGradientBrush = new LinearGradientBrush(gradientStopCollection,
new System.Windows.Point(0, 1), // startPoint (offset == 0) - note that y axis is down (so 1 is bottom)
new System.Windows.Point(0, 0)); // endPoint (offset == 1)
// Create Legend control
var gradientColorLegend = new GradientColorLegend()
{
Width = 70,
Height = 200,
Margin = new Thickness(5, 5, 5, 5)
};
gradientColorLegend.GradientBrush = linearGradientBrush;
var gradientTexture = gradientColorLegend.RenderToTexture(size: 256, isHorizontal: true);
var imageBrush = new ImageBrush(gradientTexture);
// IMPORTANT:
// When texture coordinates have one components (for example y) always set to 0,
// we need to change the ViewportUnits from the default RelativeToBoundingBox to Absolute.
imageBrush.ViewportUnits = BrushMappingMode.Absolute;
var gradientMaterial = new DiffuseMaterial(imageBrush);
// Now load sample data
// Sample data was created by using ParaView application and exporting the streamlines into csv file.
string sampleDataFileName = System.IO.Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "Resources\\Streamlines.csv");
// Create csv file reader that can read data from a csv file
var csvDataReader = new CsvDataReader();
csvDataReader.ReadFile(sampleDataFileName);
float minValue, maxValue;
csvDataReader.GetValuesRange(colorColumnName, out minValue, out maxValue);
float dataRange = maxValue - minValue;
var streamlineIndexes = csvDataReader.IndividualObjectIndexes;
// Create the streamlines
var allStreamlineBounds = new Rect3D();
for (var i = 0; i < csvDataReader.IndividualObjectIndexes.Length - 1; i++)
{
Rect3D bounds;
int startIndex = streamlineIndexes[i];
int endIndex = streamlineIndexes[i + 1] - 1;
int dataCount = endIndex - startIndex;
if (dataCount < 2) // Skip streamlines without any positions or with less then 2 positions
{
continue;
}
var positions = csvDataReader.GetPositions(startIndex, dataCount, out bounds);
allStreamlineBounds.Union(bounds);
var pathPositions = new Point3DCollection(positions);
float[] dataValues = csvDataReader.GetValues(colorColumnName, startIndex, dataCount);
// Generate texture coordinates for each path position
// Because our texture is one dimensional gradient image (size 256 x 1)
// we set the x coordinate in range from 0 to 1 (0 = first gradient color; 1 = last gradient color).
//
// Note:
// If we would only set x texture coordinate and preserve y at 0,
// WPF would not render the texture because the y size would be 0
// and because by default the ViewportUnits is set to RelativeToBoundingBox,
// WPF "thinks" the texture is empty.
// Therefore we need to set the imageBrush.ViewportUnits to Absolute.
var positionsCount = pathPositions.Count;
var textureCoordinates = new PointCollection(positionsCount);
for (int j = 0; j < dataCount; j++)
{
float relativeDataValue = (dataValues[j] - minValue) / dataRange;
if (invertColorValue)
{
relativeDataValue = 1.0f - relativeDataValue;
}
textureCoordinates.Add(new Point(relativeDataValue, 0));
}
var tubePathMesh3D = new Ab3d.Meshes.TubePathMesh3D(
pathPositions: pathPositions,
pathPositionTextureCoordinates: textureCoordinates,
radius: 0.03,
isTubeClosed: true,
isPathClosed: false,
segments: 8);
var geometryModel3D = new GeometryModel3D(tubePathMesh3D.Geometry, gradientMaterial);
//var geometryModel3D = new GeometryModel3D(tubePathMesh3D.Geometry, new DiffuseMaterial(Brushes.Red));
geometryModel3D.BackMaterial = new DiffuseMaterial(Brushes.DimGray);
var modelVisual3D = new ModelVisual3D()
{
Content = geometryModel3D
};
MainViewport.Children.Add(modelVisual3D);
}
Camera1.TargetPosition = allStreamlineBounds.GetCenterPosition();
Camera1.Distance = allStreamlineBounds.GetDiagonalLength();
// Add legend control:
int legendValuesCount = 5;
for (int i = 0; i < legendValuesCount; i++)
{
float t = (float)i / (float)(legendValuesCount - 1);
float oneValue = minValue + t * (maxValue - minValue);
string valueLegendText = string.Format(System.Globalization.CultureInfo.InvariantCulture, "{0:0.00}", oneValue);
gradientColorLegend.LegendLabels.Add(new GradientColorLegend.LegendLabel(t, valueLegendText));
}
var legendTitleTextBlock = new TextBlock()
{
Text = colorColumnName,
FontSize = 14,
FontWeight = FontWeights.Bold,
Foreground = Brushes.Black,
HorizontalAlignment = HorizontalAlignment.Center
};
var stackPanel = new StackPanel()
{
Orientation = Orientation.Vertical,
VerticalAlignment = VerticalAlignment.Bottom,
HorizontalAlignment = HorizontalAlignment.Right,
Margin = new Thickness(0, 0, 5, 5)
};
stackPanel.Children.Add(legendTitleTextBlock);
stackPanel.Children.Add(gradientColorLegend);
RootGrid.Children.Add(stackPanel);
}