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點擊下載LightningChart.NET最新試用版

使用LightningChart，您可以為各種用例創(chuàng)建不同類型的圖表。先前的教程演示了如何創(chuàng)建具有多個線系列和軸，面積系列和條形系列的簡單2D圖表。在本教程中，我們將展示如何使用IntensityGridSeries創(chuàng)建簡單的2D熱圖。

1.創(chuàng)建一個熱圖實例作為IntensityGridSeries。

// Create a Heat Map as IntensityGridSeries.
var heatMap = new IntensityGridSeries(_chart.ViewXY, axisX, axisY);

2.為IntensityGridSeries創(chuàng)建ValueRangePalette。

// Creating palette for IntensityGridSeries.
var palette = new ValueRangePalette(series);

3.從ValueRangePalette中清除預設值。

// LightningChart has some preset values for palette steps.
// Clear the preset values from palette before setting new ones.
foreach (var step in palette.Steps)
{
    step.Dispose();
}
palette.Steps.Clear();

4.定義用于為數(shù)據(jù)著色的調色板步驟。

// Add steps into palette. 
// Palette is used for presenting data in Heat Map with different colors based on their value.
palette.Steps.Add(new PaletteStep(palette, Color.FromRgb(0, 0, 255), -25));
palette.Steps.Add(new PaletteStep(palette, Color.FromRgb(20, 150, 255), 0));
palette.Steps.Add(new PaletteStep(palette, Color.FromRgb(0, 255, 0), 25));
palette.Steps.Add(new PaletteStep(palette, Color.FromRgb(255, 255, 20), 50));
palette.Steps.Add(new PaletteStep(palette, Color.FromRgb(255, 150, 20), 75));
palette.Steps.Add(new PaletteStep(palette, Color.FromRgb(255, 0, 0), 100));
palette.Type = PaletteType.Gradient;
palette.MinValue = -50;

5.生成熱圖數(shù)據(jù)。

// Generate data.
public void GenerateData(int columns, int rows)
{
    // Create new IntensityPoint series for data.
    var data = new IntensityPoint[_columns, _rows];

    // Disable rendering before updating chart properties to improve performance
    // and to prevent unnecessary chart redrawing while changing multiple properties.
    _chart.BeginUpdate();

    // Set data values and add them to Heat Map.
    for (int i = 0; i < _columns; i++)
    {
        for (int j = 0; j < _rows; j++)
        {
            // Add values to the IntensityPoint series, points are generated by using following function.
            data[i, j].Value = 30.0 + 20 * Math.Cos(20 + 0.0001 * (double)(i * j)) + 70.0 * Math.Cos((double)(j - i) * 0.01);
        }
    }

    // Add generated data as Heat Map data.
    _heatMap.Data = data;

    // Call EndUpdate to enable rendering again.
    _chart.EndUpdate();
}

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