/// <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());
}
/// <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, points);
}
/// <summary>
/// Called when the surface has changed.
/// </summary>
/// <param name="previous">The previous.</param>
/// <param name="surface">The surface.</param>
protected virtual void OnSurfaceChanged(IGraphSurface <TDataSeries> previous, IGraphSurface <TDataSeries> surface)
{
if (previous != null)
{
previous.SurfaceSizeChanged -= Surface_SurfaceSizeChanged;
previous.ZoomRectChanged -= Surface_ZoomRectChanged;
}
if (surface != null)
{
surface.SurfaceSizeChanged += Surface_SurfaceSizeChanged;
surface.ZoomRectChanged += Surface_ZoomRectChanged;
}
}
/// <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 abstract void Draw(IGraphSurface <TDataSeries> surface, TDataSeries series, IEnumerable <PointF> points, int index, int count);
/// <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>
/// 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>
/// 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));
}
