Generic Indicator Overlay on price

[monpere]

I've altered the Plot method originally from user 'Josh' s Stochastic and RSI Overlay code, to be more generic. Just add the following code to your favorite indicator to overlay it on top of price

//[Gui.Design.DisplayName(".Test")]
//Add the following method under the 'NinjaTrader.Indicator' namespace
//to override the 'Plot' method to draw the indicator overlayed on the price chart
public override void Plot(Graphics graphics, Rectangle bounds, double min, double max)
{
// Add the following variables to Initialize() method
// AutoScale = false;
// Overlay = true;
//
// The following variables can be moved out to '#region Variables'
// and corresponding '#region Properties' entries added to make these
// variables user selectable from the indicator properties sheet
// Example: for scaleHigh:
//
// Delete the scaleHigh variable from this routine.
// In '#region Variables' add the following:
// private double scaleHigh = 100;
//
// In '#region Properties' add the following:
// [Description("Scale High")]
// [Category("Parameters")]
// [Gui.Design.DisplayName("Scale High")]
// public double Scale_High
// {
// get { return scaleHigh; }
// set { scaleHigh = value; }
// }
bool drawscale = true; // Limited scale marks
double scaleHigh = 200; // Max value of indicator (100 for Stochastic, +400 for CCI, etc.)
double scaleLow = -200; // Min value of indicator (0 for Stochastic, -400 for CCI, etc.)
double upperline = 175; // Optional horizontal line 1 (80 for Stochastic)
double lowerline = -175; // Optional horizontal line 2 (20 for Stochastic)
Color uppercolor = Color.Green; // Color for line 1
Color lowercolor = Color.Green; // Color for line 2

//Draw Scale
StringFormat stringFormat = new StringFormat();
SolidBrush textBrush = new SolidBrush(Color.Black);
System.Drawing.Font textFont = new Font("Arial", 8);
double scaleRange = (scaleHigh - scaleLow);
double scaleShift = ( scaleLow < 0 ) ? -scaleLow : 0;
if(drawscale)
{
//Upper line
double line = ((upperline+scaleShift)/scaleRange)*100;
graphics.DrawLine(new Pen(uppercolor,2),bounds.X,(float)((bounds.Bottom-bounds.Y)*(1-((double)line/100))),bounds.X+bounds.Width,(float)((bounds.Botto m-bounds.Y)*(1-((double)line/100))));
graphics.DrawString(upperline.ToString(), textFont, textBrush, bounds.X, (float)((bounds.Bottom-bounds.Y)*(1-((double)line/100))),stringFormat);

//1/4 up the scale
line = (scaleRange*.75)+scaleLow;
graphics.DrawString(line.ToString(), textFont, textBrush, bounds.X, (float)((bounds.Bottom-bounds.Y)*(1-0.75)),stringFormat);

//Center Line
line = ((scaleRange/2)+scaleLow)*100;
graphics.DrawLine(new Pen(Color.DarkGray,2),bounds.X,(float)((bounds.Bot tom-bounds.Y)*0.50),bounds.X+bounds.Width,(float)((bou nds.Bottom-bounds.Y)*0.50));
graphics.DrawString(((scaleRange/2)+scaleLow).ToString(), textFont, textBrush, bounds.X, (float)((bounds.Bottom-bounds.Y)*(1-0.50)),stringFormat);

//3/4 up the scale
line = (scaleRange*.25)+scaleLow;
graphics.DrawString(line.ToString(), textFont, textBrush, bounds.X, (float)((bounds.Bottom-bounds.Y)*(1-0.25)),stringFormat);

//Lower line
line = ((lowerline+scaleShift)/scaleRange)*100;
graphics.DrawLine(new Pen(lowercolor,2),bounds.X,(float)((bounds.Bottom-bounds.Y)*(1-((double)line/100))),bounds.X+bounds.Width,(float)((bounds.Botto m-bounds.Y)*(1-((double)line/100))));
graphics.DrawString(lowerline.ToString(), textFont, textBrush, bounds.X, (float)((bounds.Bottom-bounds.Y)*(1-((double)line/100))),stringFormat);
}

//Plot Indicator
int barWidth = ChartControl.ChartStyle.GetBarPaintWidth(ChartCont rol.BarWidth);
SmoothingMode oldSmoothingMode = graphics.SmoothingMode;
GraphicsPath dpath = new GraphicsPath();
int lastX = -1;
int lastY = -1;
DataSeries series = (DataSeries) Values[0];
double seriesvalue = 0;
Gui.Chart.Plot plot = Plots[0];
for(int count = 0; count < ChartControl.BarsPainted; count++)
{
int idx = ChartControl.LastBarPainted - ChartControl.BarsPainted + 1 + count;
if (idx < 0 || idx >= Input.Count || (!ChartControl.ShowBarsRequired && idx < BarsRequired))
continue;

seriesvalue = ((series.Get(idx))+scaleShift)/scaleRange;
if (seriesvalue == 0)
continue;

int x = (int) (ChartControl.CanvasRight - ChartControl.BarMarginRight - barWidth / 2 - (ChartControl.BarsPainted - 1) * ChartControl.BarSpace + count * ChartControl.BarSpace) + 1;
int y = (int) ((bounds.Bottom-bounds.Y)*(1-seriesvalue));

if (lastX >= 0)
{
dpath.AddLine(lastX - plot.Pen.Width / 2, lastY, x - plot.Pen.Width / 2, y);
}

lastX = x;
lastY = y;
}
dpath.Reverse();

graphics.SmoothingMode = SmoothingMode.AntiAlias;
graphics.DrawPath(Plots[0].Pen, dpath);
graphics.SmoothingMode = oldSmoothingMode;
}

[NinjaTrader_Josh]

Awesome monpere. Thanks!

[sbgtrading]

Excellent! Thank you!

[sbgtrading]

Hmmm...can you give us an example of exactly where to paste your code in? I've been unable to find the right location...keep getting compile errors.

[NinjaTrader_Josh]

It would go outside of the OnBarUpdate(), but inside the Indicator namespace.

[sbgtrading]

Hmmm...still having trouble. Can someone check the posted code to see if it's missing a "}"...or has too many of them perhaps? If not, then can someone post a test indicator that has this new code in there correctly? Thanks!

Originally Posted by Josh

It would go outside of the OnBarUpdate(), but inside the Indicator namespace.

[NinjaTrader_Josh]

What you probably experienced was some weirdness in the formatting when you copy and paste the code. Extra white space was added between variable names so that caused errors.

[MichaelB]

Hi Josh,
Is this a possible starting area to create a MACD Line overlay on price chart indicator?
ie, instead of having the "Diff" option set to Histogram , instead it is selected to Line to represent the value above and below the horizontal zero line ?
Thanks
Michael b

[NinjaTrader_Josh]

For sure MichaelB, but this is beyond the level of support we can offer. Feel free to play around with the code though. I believe that is the reason why monpere released it .

[MichaelB]

Hi Josh,
Thanks
cheers
Michael B