public void ClearSeries()
{
m_DataSets.Clear();
m_BackupSeries = null;
this.m_fMin = this.m_fMax = float.NaN;
FireRedrawRequired(this, new EventArgs());
}
public void RemoveSeries(GraphSeries series)
{
m_DataSets.Remove(series);
series.RedrawRequired -= new EventHandler(series_RedrawRequired);
FireRedrawRequired(this, new EventArgs());
}
public void AddSeries(GraphSeries series)
{
m_DataSets.Add(series);
series.RedrawRequired += new EventHandler(series_RedrawRequired);
RecalculateMinMax();
FireRedrawRequired(this, new EventArgs());
}
protected void DrawDataSet(GraphSeries d, Graphics gfx, RectangleF plotRect, int lineLoc)
{
Color c = d.Selected ? d.DefaultColour : Color.FromArgb(m_nUnselectedTransparency, d.DefaultColour);
Pen dataPen = new Pen(c, 2);
//Handle the extreme cases first:
if (float.IsInfinity(d.Max) || float.IsInfinity(d.Min) ||
float.IsNaN(d.Max) || float.IsNaN(d.Min) || Range == 0)
{
//gfx.DrawLine(dataPen, new PointF(plotRect.Bottom, plotRect.Left), new PointF(plotRect.Bottom, plotRect.Right));
return;
}
gfx.SetClip(plotRect);
double pixelGranularity = Range / plotRect.Width;
double gran = pixelGranularity > d.Granularity ? pixelGranularity : d.Granularity;
int dataPoints = (int)(Range / gran + 1);
if (dataPoints < 2) dataPoints = 2; //Avoid divide by zero problems, and ensure that the graph at least draws a line across it.
PointF lastPoint = PointF.Empty;
float XFact = plotRect.Width / (dataPoints - 1);
float dMin;
if (d.Logarithmic && d.Min * d.Max <= 0)
dMin = d.Max * 1E-6f;
else
dMin = d.Min;
if (d.Max == dMin)
{
//This is the special case of the function not varying with x. However, the function may still not be valid for all x:
float Y = (plotRect.Top + plotRect.Bottom) / 2 + lineLoc;
for (int i = 0; i < dataPoints; i++)
{
double x = i * gran + m_dMinXValue;
PointF newPoint = d.ValidAt(x) ? new PointF(plotRect.Left + i * XFact, Y) : PointF.Empty;
if (lastPoint != PointF.Empty && newPoint != PointF.Empty)
gfx.DrawLine(dataPen, lastPoint, newPoint);
lastPoint = newPoint;
}
}
else
{
float YFact = (float) (d.Logarithmic ? plotRect.Height / Math.Log(d.Max / dMin) : plotRect.Height / (d.Max - dMin));
for (int i = 0; i < dataPoints; i++)
{
double x = i * gran + m_dMinXValue;
double y = d.ValidAt(x) ? d.ValueAt(x) : 0;
float yScreenSpace = (float) (d.Logarithmic ? y * dMin > 0 ? Math.Log(y/dMin) : double.NaN : (y - dMin));
PointF newPoint = d.ValidAt(x) && !double.IsNaN(yScreenSpace) ? new PointF(plotRect.Left + i * XFact, plotRect.Bottom - YFact * yScreenSpace) : PointF.Empty;
if (lastPoint != PointF.Empty && newPoint != PointF.Empty)
gfx.DrawLine(dataPen, lastPoint, newPoint);
lastPoint = newPoint;
}
}
gfx.SetClip(this.ClientRectangle);
}
public void RemoveDataset(GraphSeries d)
{
m_Datasets.Remove(d);
d.RedrawRequired -= new EventHandler(d_RedrawRequired);
this.Invalidate();
}
public void AddDataset(GraphSeries d)
{
if (!m_Datasets.Contains(d))
{
m_Datasets.Add(d);
d.RedrawRequired += new EventHandler(d_RedrawRequired);
d.MinX = MinXValue;
d.MaxX = MaxXValue;
}
this.Invalidate();
}
