public override void Draw(Graphics g, AxisCollection yAxisCollection, XAxis xAxis, AdvancedRect area)
{
if (data.Count == 0)
{
return;
}
GraphicsState _s = g.Save();
g.SmoothingMode = SmoothingMode.AntiAlias;
NumericAxis yAxis = yAxisCollection[YAxisName];
double[] baseY = new double[data.Count];
if (yAxis.LogAxis)
{
for (int i = 0; i < data.Count; i++)
{
baseY[i] = yAxis.ScaleMinimum;
}
}
else
{
for (int i = 0; i < data.Count; i++)
{
baseY[i] = 0;
}
}
for (int ySet = 0; ySet < data.GetY(0).Length; ySet++)
{
PointF[] polygon = new PointF[data.Count * 2];
PointF[] line = new PointF[data.Count];
int j = 0;
for (int i = (data.Count - 1); i >= 0; i--, j++)
{
polygon[j] = new PointF(
xAxis.DataToCoordinate(data.GetX(i), area),
yAxis.DataToCoordinate(baseY[i], area)
);
}
for (int i = 0; i < data.Count; i++, j++)
{
double?y = data.GetY(i)[ySet];
if (y == null)
{
y = baseY[i];
}
else
{
y = baseY[i] + y.Value;
}
polygon[j] = new PointF(
xAxis.DataToCoordinate(data.GetX(i), area),
yAxis.DataToCoordinate(y.Value, area)
);
line[i] = polygon[j];
baseY[i] = y.Value;
}
if (brushes.Count != 0)
{
int idx = ySet % brushes.Count;
using (Brush br = brushes[idx].CreateBrush())
g.FillPolygon(br, polygon);
}
if (pens.Count != 0 && line.Length >= 2)
{
int idx = ySet % pens.Count;
using (Pen p = pens[idx].CreatePen())
g.DrawLines(p, line);
}
}
g.Restore(_s);
}
private void drawLines(Graphics g, Pen p, Symbol s, XAxis xAxis, NumericAxis yAxis, AdvancedRect area, int start, int end)
{
PointF[] pt;
int count = end - start;
if (stepLine)
{
if (end == data.Count && count == 1)
{
// drawing a single point at the end going nowhere,
// not possible. fixme: make a symbol or something to
// indicate a single point?
return;
}
pt = new PointF[count * 2 - (end == data.Count ? 1 : 0)];
for (int i = 0; i < count; i++)
{
pt[i * 2].X = xAxis.DataToCoordinate(data.GetX(start + i), area);
pt[i * 2].Y = yAxis.DataToCoordinate(data.GetY(start + i).Value, area);
if ((start + i + 1) < data.Count)
{
pt[(i * 2) + 1].X = xAxis.DataToCoordinate(data.GetX(start + i + 1), area);
pt[(i * 2) + 1].Y = pt[i * 2].Y;
}
}
}
else
{
if (count == 1)
{
// can't really draw a line here.
// fixme: make a symbol or something to indicate a single
// point?
return;
}
pt = new PointF[count];
for (int i = 0; i < count; i++)
{
pt[i].X = xAxis.DataToCoordinate(data.GetX(start + i), area);
pt[i].Y = yAxis.DataToCoordinate(data.GetY(start + i).Value, area);
}
}
g.DrawLines(p, pt);
switch (SymbolStyle)
{
case SymbolStyle.IdentifyPoints:
foreach (PointF x in pt)
{
s.DrawCenteredAt(g, x);
}
break;
case SymbolStyle.IdentifyLine:
PointF lastPt = pt[0];
for (int i = 1; i < pt.Length; i++)
{
PointF curPt = pt[i];
double dist = Math.Sqrt(Math.Pow(curPt.X - lastPt.X, 2) + Math.Pow(curPt.Y - lastPt.Y, 2));
if (dist > 0.5)
{
s.DrawCenteredAt(g, curPt);
lastPt = curPt;
}
}
break;
}
}