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using System.Collections.Generic;
using System.Linq;
using System.Drawing;
namespace RealTimeGraphX
{
/// <summary>
/// Represents an <see cref="IGraphRenderer{TDataSeries}"/> base class.
/// </summary>
/// <typeparam name="TDataSeries">The type of the data series.</typeparam>
/// <seealso cref="RealTimeGraphX.GraphObject" />
/// <seealso cref="RealTimeGraphX.IGraphRenderer{TDataSeries}" />
public abstract class GraphRenderer<TDataSeries> : GraphObject, IGraphRenderer<TDataSeries> where TDataSeries : IGraphDataSeries
{
/// <summary>
/// Converts the specified relative x position to a graph surface absolute position.
/// </summary>
/// <param name="surface">The target surface.</param>
/// <param name="x">The relative x position.</param>
/// <returns></returns>
protected virtual float ConvertXValueToRendererValue(IGraphSurface<TDataSeries> surface, double x)
{
return (float)(x * surface.GetSize().Width / 100);
}
/// <summary>
/// Converts the specified relative y position to a graph surface absolute position.
/// </summary>
/// <param name="surface">The surface.</param>
/// <param name="y">The relative y position.</param>
/// <returns></returns>
protected virtual float ConvertYValueToRendererValue(IGraphSurface<TDataSeries> surface, double y)
{
return (float)(surface.GetSize().Height - (y * surface.GetSize().Height / 100));
}
/// <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 abstract IEnumerable<PointF> Render(IGraphSurface<TDataSeries> surface, TDataSeries series, IGraphRange range, List<GraphDataPoint> xx, List<GraphDataPoint> yy, GraphDataPoint minimumX, GraphDataPoint maximumX, GraphDataPoint minimumY, GraphDataPoint maximumY);
/// <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 abstract void Draw(IGraphSurface<TDataSeries> surface, TDataSeries series, IEnumerable<PointF> points, int index, int count);
/// <summary>
/// Gets a closed polygon version of the specified drawing points.
/// </summary>
/// <param name="surface">The target surface.</param>
/// <param name="points">The drawing points.</param>
/// <returns></returns>
protected virtual IEnumerable<PointF> GetFillPoints(IGraphSurface<TDataSeries> surface, IEnumerable<PointF> points)
{
List<PointF> closed = points.ToList();
closed.Add(new PointF(points.Last().X, surface.GetSize().Width));
closed.Add(new PointF(0, surface.GetSize().Height));
return closed.ToArray();
}
}
}
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