/// <summary>
/// Translates a collection of <see cref="GradientStop" /> to an <see cref="OxyPalette" />.
/// </summary>
/// <param name="stops">
/// The gradient stops collection to convert.
/// </param>
/// <param name="paletteSize">
/// The palette size.
/// </param>
/// <returns>
/// The interpolated <see cref="OxyPalette"/>.
/// </returns>
private static OxyPalette Interpolate(List <GradientStop> stops, int paletteSize)
{
Debug.Assert(stops.Count >= 2, "Can't interpolate less than 2 gradient stops.");
Debug.Assert(paletteSize > 0, "Palette size must be non-zero positive number.");
var palette = new List <OxyColor>();
stops.Sort((x1, x2) => x1.Offset.CompareTo(x2.Offset));
var palettePositions = stops[0].Offset;
var step = (double)stops.Count / paletteSize;
for (int i = 0; i < stops.Count - 1; i++)
{
var start = stops[i];
var end = stops[i + 1];
while (palettePositions <= end.Offset)
{
palette.Add(
OxyColor.Interpolate(
start.Color.ToOxyColor(),
end.Color.ToOxyColor(),
(palettePositions - start.Offset) / (end.Offset - start.Offset)));
palettePositions += step;
}
}
return(new OxyPalette(palette));
}
public ScatterSeries GetNegativePointsSeriers()
{
var clusterPoints = new ScatterSeries {
MarkerFill = OxyColor.Interpolate(Color, OxyColor.FromRgb(0, 0, 0), 0.5)
};
clusterPoints.Points.AddRange(
Solution.Cluster.Points.Where(p => !p.Label).Select(
p => new ScatterPoint(p[XIndex], p[YIndex], 2)));
return(clusterPoints);
}
private Contour[] GenerateContours(double min, double max, OxyColor minColor, OxyColor maxColor, int nrOfContours)
{
double delta = max - min;
double stepSize = delta / nrOfContours;
double colorStepSize = 1 / (double)nrOfContours;
var contours = new Contour[nrOfContours];
for (int i = 1; i <= nrOfContours; i++)
{
contours[i - 1] = new Contour(min + i * stepSize, OxyColor.Interpolate(minColor, maxColor, i * colorStepSize));
}
return(contours);
}
OxyColor InterpolateColour(System.Drawing.Color start, System.Drawing.Color end, int index, int count)
{
double range = 0;
if (count > 1)
{
range = (double)index / (double)(count - 1);
}
return(OxyColor.Interpolate(
OxyColor.FromArgb(start.A, start.R, start.G, start.B),
OxyColor.FromArgb(end.A, end.R, end.G, end.B),
range));
}
private OxyImage GetGradientImage(OxyColor color1, OxyColor color2)
{
int n = 256;
var imageData = new OxyColor[1, n];
for (int i = 0; i < n; i++)
{
imageData[0, i] = OxyColor.Interpolate(color1, color2, i / (n - 1.0));
}
var encoder = new PngEncoder(new PngEncoderOptions());
return(new OxyImage(encoder.Encode(imageData)));
}
private void AddSeries(string title)
{
switch (_modelName)
{
case AnalisisConstants.AGENT_INPUT_OUTPUT_NAME:
_model.Series.Add(new LineSeries(title)
{
Smooth = true
});
break;
case AnalisisConstants.SPECTRAL_DENSITY_NAME:
_model.Series.Add(new ScatterSeries(title, OxyColor.Interpolate(OxyColors.Blue, OxyColors.Black, 1)));
break;
default:
_model.Series.Add(new LineSeries(title));
break;
}
}
public static PlotModel ImageAnnotationAsBackgroundGradient()
{
// http://en.wikipedia.org/wiki/Chartjunk
var model = new PlotModel {
Title = "Using ImageAnnotations to draw a gradient backgrounds", Subtitle = "But do you really want this? This is called 'chartjunk'!", PlotMargins = new OxyThickness(60, 4, 4, 60)
};
model.Axes.Add(new LinearAxis {
Position = AxisPosition.Bottom
});
model.Axes.Add(new LinearAxis {
Position = AxisPosition.Left
});
// create a gradient image of height n
int n = 256;
var imageData1 = new OxyColor[1, n];
for (int i = 0; i < n; i++)
{
imageData1[0, i] = OxyColor.Interpolate(OxyColors.Blue, OxyColors.Red, i / (n - 1.0));
}
var image1 = OxyImage.Create(imageData1, ImageFormat.Png); // png is required for silverlight
// or create a gradient image of height 2 (requires bitmap interpolation to be supported)
var imageData2 = new OxyColor[1, 2];
imageData2[0, 0] = OxyColors.Yellow; // top color
imageData2[0, 1] = OxyColors.Gray; // bottom color
var image2 = OxyImage.Create(imageData2, ImageFormat.Png); // png is required for silverlight
// gradient filling the viewport
model.Annotations.Add(new ImageAnnotation
{
ImageSource = image2,
Interpolate = true,
Layer = AnnotationLayer.BelowAxes,
X = new PlotLength(0, PlotLengthUnit.RelativeToViewport),
Y = new PlotLength(0, PlotLengthUnit.RelativeToViewport),
Width = new PlotLength(1, PlotLengthUnit.RelativeToViewport),
Height = new PlotLength(1, PlotLengthUnit.RelativeToViewport),
HorizontalAlignment = HorizontalAlignment.Left,
VerticalAlignment = VerticalAlignment.Top
});
// gradient filling the plot area
model.Annotations.Add(new ImageAnnotation
{
ImageSource = image1,
Interpolate = true,
Layer = AnnotationLayer.BelowAxes,
X = new PlotLength(0, PlotLengthUnit.RelativeToPlotArea),
Y = new PlotLength(0, PlotLengthUnit.RelativeToPlotArea),
Width = new PlotLength(1, PlotLengthUnit.RelativeToPlotArea),
Height = new PlotLength(1, PlotLengthUnit.RelativeToPlotArea),
HorizontalAlignment = HorizontalAlignment.Left,
VerticalAlignment = VerticalAlignment.Top
});
// verify that a series is rendered above the gradients
model.Series.Add(new FunctionSeries(Math.Sin, 0, 7, 0.01));
return(model);
}
