/// <summary>
/// Draws the line plot on a GDI+ surface against the provided x and y axes.
/// </summary>
/// <param name="g">The GDI+ surface on which to draw.</param>
/// <param name="xAxis">The X-Axis to draw against.</param>
/// <param name="yAxis">The Y-Axis to draw against.</param>
public void Draw(Graphics g, PhysicalAxis xAxis, PhysicalAxis yAxis)
{
try
{
double xVal, yVal;
int pointCount = m_lineData.Count;
if (pointCount == 0)
{
return;
}
Stopwatch sw = StepTimer.Start("Transform");
Transform2D t = new Transform2D(xAxis, yAxis);
// clipping is now handled assigning a clip region in the
// graphic object before this call
if (pointCount == 1)
{
m_lineData.Get(0, out xVal, out yVal);
PointF physical = t.Transform(xVal, yVal);
g.DrawLine(Pen, physical.X - 0.5f, physical.Y, physical.X + 0.5f, physical.Y);
}
else
{
int index = 0;
PointF[] points = new PointF[pointCount];
PointF lastPoint = new PointF(Single.NaN, Single.NaN);
for (int i = 0; i < pointCount; ++i)
{
// check to see if any values null. If so, then continue.
m_lineData.Get(i, out xVal, out yVal);
if (!Double.IsNaN(xVal + yVal)) //Adding a NaN with anything yeilds NaN
{
const float GDIMax = 1000000000f;
const float GDIMin = -1000000000f;
PointF p1 = t.Transform(xVal, yVal);
if (p1.X > GDIMax)
{
p1.X = GDIMax;
}
if (p1.X < GDIMin)
{
p1.X = GDIMin;
}
if (p1.Y > GDIMax)
{
p1.Y = GDIMax;
}
if (p1.Y < GDIMin)
{
p1.Y = GDIMin;
}
if (!float.IsNaN(p1.X) && !float.IsNaN(p1.Y))
{
if (p1 != lastPoint)
{
lastPoint = p1;
points[index] = p1;
index++;
}
}
}
}
//System.Drawing.Drawing2D.GraphicsPath graphicsPath = new System.Drawing.Drawing2D.GraphicsPath();
//graphicsPath.AddLines(points.ToArray());
//g.DrawPath(Pen, graphicsPath);
//g.CompositingQuality = CompositingQuality.HighQuality;
//g.SmoothingMode = SmoothingMode.HighQuality;
StepTimer.Stop(sw);
sw = StepTimer.Start("GDI+");
if (index == 0)
{
return;
}
else if (index == 1)
{
PointF physical = points[0];
g.DrawLine(Pen, physical.X - 0.5f, physical.Y, physical.X + 0.5f, physical.Y);
return;
}
if (index == points.Length)
{
g.DrawLines(Pen, points);
}
else
{
PointF[] newArray = new PointF[index];
Array.Copy(points, 0, newArray, 0, index);
g.DrawLines(Pen, newArray);
}
StepTimer.Stop(sw);
}
}
catch (Exception ex)
{
MessageBox.Show(ex.ToString());
throw;
}
}
