Vector Field

Vector Field Quickstart

Vectors (representing a magnitude and direction) can be placed at specific points in coordinate space to display as a vector field.

VectorField.cs

ScottPlot.Plot myPlot = new();

// generate a grid of positions
double[] xs = Generate.Consecutive(10);
double[] ys = Generate.Consecutive(10);

// create a collection of vectors
List<RootedCoordinateVector> vectors = new();
for (int i = 0; i < xs.Length; i++)
{
    for (int j = 0; j < ys.Length; j++)
    {
        // point on the grid
        Coordinates pt = new(xs[i], ys[j]);

        // direction & magnitude
        float dX = (float)ys[j];
        float dY = -9.81f / 0.5f * (float)Math.Sin(xs[i]);
        System.Numerics.Vector2 v = new(dX, dY);

        // add to the collection
        RootedCoordinateVector vector = new(pt, v);
        vectors.Add(vector);
    }
}

// plot the collection of rooted vectors as a vector field
myPlot.Add.VectorField(vectors);

myPlot.SavePng("demo.png", 400, 300);

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Vector Field Colormap

Vector field arrows can be colored according to their magnitude.

VectorField.cs

ScottPlot.Plot myPlot = new();

RootedCoordinateVector[] vectors = Generate.SampleVectors();
var vf = myPlot.Add.VectorField(vectors);
vf.Colormap = new ScottPlot.Colormaps.Turbo();

myPlot.SavePng("demo.png", 400, 300);

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Vector Field Arrow Length

Length of arrows in a vector field may be customized by defining length (in pixel units) to display the longest vector.

VectorField.cs

ScottPlot.Plot myPlot = new();

RootedCoordinateVector[] vectors = Generate.SampleVectors();
var vf = myPlot.Add.VectorField(vectors);
vf.MaximumArrowLength = 15;

myPlot.SavePng("demo.png", 400, 300);

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