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using System;
using System.Collections.Generic;
using System.Drawing;
using System.Linq;
namespace RealTimeGraphX.Renderers
{
/// <summary>
/// Represents a scrolling style <see cref="GraphRenderer{TDataSeries}"/>.
/// </summary>
/// <typeparam name="TDataSeries">The type of the data series.</typeparam>
/// <seealso cref="RealTimeGraphX.GraphRenderer{TDataSeries}" />
public class ScrollingLineRenderer<TDataSeries> : GraphRenderer<TDataSeries> where TDataSeries : IGraphDataSeries
{
/// <summary>
/// Arranges the series of data points and returns a series of drawing points.
/// </summary>
/// <param name="surface">The target graph surface.</param>
/// <param name="series">The instance of the current rendered data series.</param>
/// <param name="range">Instance of graph range.</param>
/// <param name="xx">Collection of x coordinates.</param>
/// <param name="yy">Collection of y coordinates.</param>
/// <param name="minimumX">The minimum x coordinates value.</param>
/// <param name="maximumX">The maximum x coordinates value.</param>
/// <param name="minimumY">The minimum y coordinates value.</param>
/// <param name="maximumY">The maximum y coordinates value.</param>
/// <returns></returns>
public override IEnumerable<PointF> Render(IGraphSurface<TDataSeries> surface, TDataSeries series, IGraphRange range, List<GraphDataPoint> xx, List<GraphDataPoint> yy, GraphDataPoint minimumX, GraphDataPoint maximumX, GraphDataPoint minimumY, GraphDataPoint maximumY)
{
var dxList = xx.Select(x => x.ComputeRelativePosition(minimumX, maximumX)).ToList();
var dyList = yy.Select(x => x.ComputeRelativePosition(minimumY, maximumY)).ToList();
if (maximumX - minimumX > range.MaximumX)
{
var offset = ((maximumX - minimumX) - range.MaximumX) + minimumX;
for (int i = 0; i < xx.Count; i++)
{
if (xx[i] < offset)
{
xx.RemoveAt(i);
yy.RemoveAt(i);
i--;
}
else
{
break;
}
}
}
List<PointF> points = new List<PointF>();
for (int i = 0; i < dxList.Count; i++)
{
float image_x = ConvertXValueToRendererValue(surface,dxList[i]);
float image_y = (float)Math.Min(ConvertYValueToRendererValue(surface, dyList[i]), surface.GetSize().Height - 2);
PointF point = new PointF(image_x, image_y);
points.Add(point);
}
return points;
}
/// <summary>
/// Draws the specified data series points on the target surface.
/// </summary>
/// <param name="surface">The target graph surface.</param>
/// <param name="series">The instance of the current rendered data series.</param>
/// <param name="points">The collection of the current data series drawing points.</param>
/// <param name="index">The index of the current data series within the collection of data series.</param>
/// <param name="count">The length of the data series collection.</param>
public override void Draw(IGraphSurface<TDataSeries> surface, TDataSeries series, IEnumerable<PointF> points, int index, int count)
{
if (series.UseFill)
{
surface.FillSeries(series, GetFillPoints(surface, points));
}
surface.DrawSeries(series, GetFillPoints(surface, points));
}
}
}
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