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I am going through the showcase example for the spectrogram and I had a confusion on the sizeX and Y parameter of SCIUniformHeatmapDataSeries. Are these sizes as per the width and height of the surfaceChart ? I am going to plot an array of data. How do I determine the correct sizes for X and Y.
Moreover, is it necessary that the size array used for updating the dataSeries has to be (xSize*ySize)?
The SizeX, SizeY in the heat map: these are sizes of the two dimensional array of values in the X and Y direction. This does not dictate the size of the SCIChartSurface -rather the surface will resize to fit its parent under normal conditions.
The array size for updating the heat map does need to be xSize * ySize. You can change the size of the array by creating a new SCIUniformHeatmapDataSeries.
Colours are mapped with a colormap of gradient stops. Please see the example here:
let stops = UnsafeMutablePointer<Float>.allocate(capacity: countColors) stops = 0.0 stops = 0.2 stops = 0.4 stops = 0.6 stops = 0.8 stops = 1.0 let gradientColor = UnsafeMutablePointer<uint>.allocate(capacity: countColors) gradientColor = 0xFF00008B; gradientColor = 0xFF6495ED; gradientColor = 0xFF006400; gradientColor = 0xFF7FFF00; gradientColor = 0xFFFFFF00; gradientColor = 0xFFFF0000; let colorMap = SCITextureOpenGL.init(gradientCoords: stops, colors: gradientColor, count: Int32(countColors)) let heatRenderableSeries = SCIFastUniformHeatmapRenderableSeries() heatRenderableSeries.maximum = 200.0 heatRenderableSeries.minimum = 1.0 heatRenderableSeries.dataSeries = heatmapDataSeries heatRenderableSeries.colorMap = colorMap
You can see here we create a collection of gradient stops and create a colorMap texture which is applied to the heatmapRenderableSeries.colorMap.
How these are mapped are:
Let me know if this helps!
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