You can make a plot look broken in several ways.
Solution 1: Easy way
Set WaveformPlot.ProcessSepcialValues to true. Now, in the data plot Double.Nan to get a break in the plot.
waveformPlot1.ProcessSpecialValues = true;
waveformPlot1.PlotYAppend(new double[] { 2, 3, 7, 5, double.NaN, double.NaN, 6, 9, 8, 4 });
Solution 2: Not so easy way
1) Hook on to the Plot.BeforeDraw, and cancel the plot drawing. And do the following in the event handler.
2) Get the pixel coordinates for the break using WaveformPlot.Map(..). (Here we calculate start position
and end position of the break in the pixel coordinates from the data
coordinates).
3) Draw the plot to a temp Bitmap.
4) Once you know where the break appears in the pixel coordinates, use
Bitmap.SetPixel(...) method to set pixels in the rectangular region to Color.Transparent.
5) Use the grahics object from the event args to draw an image on the Plot area bounds.
6) Done.
Hope this helps.
Vijet Patankar
NationalInstruments.
class MyPlot : WaveformPlot
{
int stopDrawingPoint = 2, skipPoints = 2;
public int StopDrawingPoint
{
get
{
return stopDrawingPoint;
}
}
public int SkipPoints
{
get
{
return skipPoints;
}
}
//protected override void OnBeforeDraw(BeforeDrawXYPlotEventArgs e)
//{
// e.Cancel = true;
// Graphics g = e.Graphics;
// double[] xData = e.Plot.GetXData();
// double[] yData = e.Plot.GetYData();
// double[] xDataBeforeBreak = GetPointsBeforeBreak(xData);
// double[] xDataAfterBreak = GetPointsAfterBreak(xData);
// double[] yDataBeforeBreak = GetPointsBeforeBreak(yData);
// double[] yDataAfterBreak = GetPointsAfterBreak(yData);
// Bitmap b = new Bitmap(e.Bounds.Width, e.Bounds.Height);
// Graphics gg = Graphics.FromImage(b);
// e.Plot.DrawLines(new ComponentDrawArgs(gg, e.Bounds));
// g.DrawImage(b, e.Bounds.Location);
// //PointF[] pointsBeforeBreak = e.Plot.MapDataPoints(e.Bounds, xDataBeforeBreak, yDataBeforeBreak);
// //g.DrawLines(new Pen(e.Plot.LineColor), pointsBeforeBreak);
// //PointF[] pointsAfterBreak = e.Plot.MapDataPoints(e.Bounds, xDataAfterBreak, yDataAfterBreak);
// //g.DrawLines(new Pen(e.Plot.LineColor), pointsAfterBreak);
//}
protected override void OnBeforeDraw(BeforeDrawXYPlotEventArgs e)
{
e.Cancel = true;
Graphics g = e.Graphics;
double[] xData = e.Plot.GetXData();
double[] yData = e.Plot.GetYData();
double[] xDataBeforeBreak = GetPointsBeforeBreak(xData);
double[] xDataAfterBreak = GetPointsAfterBreak(xData);
double[] yDataBeforeBreak = GetPointsBeforeBreak(yData);
double[] yDataAfterBreak = GetPointsAfterBreak(yData);
PointF[] pointsBeforeBreak = e.Plot.MapDataPoints(e.Bounds, xDataBeforeBreak, yDataBeforeBreak);
g.DrawLines(new Pen(e.Plot.LineColor), pointsBeforeBreak);
PointF[] pointsAfterBreak = e.Plot.MapDataPoints(e.Bounds, xDataAfterBreak, yDataAfterBreak);
g.DrawLines(new Pen(e.Plot.LineColor), pointsAfterBreak);
}
private double[] GetPointsAfterBreak(double[] data)
{
double[] newData = new double[data.Length - (stopDrawingPoint + skipPoints)];
for (int i = 0; i < newData.Length; i++)
{
newData[i] = data[i + stopDrawingPoint + skipPoints];
}
return newData;
}
private double[] GetPointsBeforeBreak(double[] data)
{
double[] newData = new double[stopDrawingPoint];
for (int i = 0; i < stopDrawingPoint; i++ )
{
newData[i] = data[i];
}
return newData;
}
}
