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using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace RealTimeGraphX.Renderers
{
/// <summary>
/// Represents a scrolling style graph renderer.
/// </summary>
/// <typeparam name="TDataSeries">The type of the graph data series.</typeparam>
/// <typeparam name="XDataPoint">The type of the x-axis data point.</typeparam>
/// <typeparam name="YDataPoint">The type of the y-axis data point.</typeparam>
/// <seealso cref="RealTimeGraphX.GraphRendererBase{XDataPoint, YDataPoint}" />
public class GraphScrollingRenderer<TDataSeries, XDataPoint, YDataPoint> : GraphRendererBase<TDataSeries, XDataPoint, YDataPoint> where XDataPoint : GraphDataPointBase where YDataPoint : GraphDataPointBase where TDataSeries : IGraphDataSeries
{
/// <summary>
/// Returns an array of absolute graph data points to render.
/// This method is called per data series.
/// </summary>
/// <param name="seriesCollection">A collection of all data series that is currently in the rendering pass.</param>
/// <param name="series">The current data series to render.</param>
/// <param name="toRender">Pending data series object to render.</param>
/// <returns></returns>
protected override List<GraphPoint> OnRender(IEnumerable<PendingSeries> seriesCollection, TDataSeries series, PendingSeries toRender)
{
List<GraphPoint> points = new List<GraphPoint>();
if (toRender.XX.Count > 0 && toRender.YY.Count > 0)
{
XDataPoint min_x = toRender.XX.First();
XDataPoint max_x = toRender.XX.Last();
YDataPoint min_y = Input.Range.MinimumY;
YDataPoint max_y = Input.Range.MaximumY;
if (Input.Range.AutoY)
{
min_y = _current_min_y;
max_y = _current_max_y;
}
OnEffectiveRangeXChanged(min_x, max_x);
OnEffectiveRangeYChanged(min_y, max_y);
var dxList = toRender.XX.Select(x => x.ComputeRelativePosition(min_x, max_x)).ToList();
var dyList = toRender.YY.Select(x => x.ComputeRelativePosition(min_y, max_y)).ToList();
if (max_x - min_x > Input.Range.MaximumX)
{
var offset = ((max_x - min_x) - Input.Range.MaximumX) + min_x;
for (int i = 0; i < toRender.XX.Count; i++)
{
if (toRender.XX[i] < offset)
{
toRender.XX.RemoveAt(i);
toRender.YY.RemoveAt(i);
i--;
}
else
{
break;
}
}
}
for (int i = 0; i < dxList.Count; i++)
{
float image_x = ConvertXValueToRendererValue(dxList[i]);
float image_y = (float)Math.Min(ConvertYValueToRendererValue(dyList[i]), Output.SurfaceHeight - 2);
GraphPoint point = new GraphPoint(image_x, image_y);
points.Add(point);
}
}
return points;
}
}
}
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