Obtaining current number of points being rendered in zoomed viewing window

[kzhaowmm]

Is there a method to obtain the total number of points being rendered by the chart within a particular viewport scale (or zoom level)?

There seems to be a more inaccurate method of calculating, such as taking the total number of points being fed into the chart and dividing the by the X viewport scale....but this is not exact and I'd like to see if there is another alternative.

Thanks!

[liuxuan30]

I don't see a method doing this if I remember correctly.

but there is something similar:

    open var lowestVisibleX: Double
    {
        var pt = CGPoint(
            x: viewPortHandler.contentLeft,
            y: viewPortHandler.contentBottom)
        
        getTransformer(forAxis: .left).pixelToValues(&pt)
        
        return max(xAxis._axisMinimum, Double(pt.x))
    }
    
    /// - returns: The highest x-index (value on the x-axis) that is still visible on the chart.
    open var highestVisibleX: Double
    {
        var pt = CGPoint(
            x: viewPortHandler.contentRight,
            y: viewPortHandler.contentBottom)
        
        getTransformer(forAxis: .left).pixelToValues(&pt)

        return min(xAxis._axisMaximum, Double(pt.x))
    }

This returns the highest and lowest visible X value, and you can then get how many x values are rendered, you can calculate how many entries you have for each x.