Little help with Draw Region

September 24th, 2013, 03:31 PM

try DrawOnPricePanel = false, examp:

DrawOnPricePanel = false;
DrawTextFixed("Daily Volume",mystring,TextPosition.TopRight);
DrawOnPricePanel = true;

September 24th, 2013, 05:58 PM

cory

try DrawOnPricePanel = false, examp:

DrawOnPricePanel = false;
DrawTextFixed("Daily Volume",mystring,TextPosition.TopRight);
DrawOnPricePanel = true;

@cory,

Thanks a bunch, works great!

September 24th, 2013, 06:21 PM

aligator

@Fat Tails,

Can one use the Drawregion to fill between say the 30 and 70 lines on RSI indicator in indicator panel?

I tried it, but it painted inside the entire main series panel.

Thanks.

DrawRegion() can be used to fill the space

-> between two plots
-> or between a plot and a horizontal line

For your purpose, which is filling the space between two horizontal lines, I would suggest to use the NinjaScript method DrawRectangle(). The only problem with DrawRectangle() is that it plots on top of the lines plotted by the same indicator, while DrawRegion() is well behaved and draws behind.

In case that you want to fill the area behind all indicator plots and lines, which is impossible to achieve with DrawRectangle() you have two options

-> add a transparent plot which takes the constant value 30 (or 70) and then apply DrawRegion() to that plot and the other fixed line
-> add a custom plot to the indicator, which simply fills the area between the two lines

The last option is the most elegant one. You just need to code a few lines to achieve it. Below is a code snippet that you can use or modify for a custom plot.

Code

public override void Plot(Graphics graphics, Rectangle bounds, double min, double max)
{
    if (Bars == null || ChartControl == null || this.LastBarIndexPainted < BarsRequired)
	 return;
    SolidBrush fillBrush = new SolidBrush(fillColor);
    int firstXToFill = ChartControl.GetXByBarIdx(BarsArray[0], this.LastBarIndexPainted);
    int lastXToFill = ChartControl.GetXByBarIdx(BarsArray[0], this.FirstBarIndexPainted);
    int yHigh = ChartControl.GetYByValue(this, 70) + (int)Lines[1].Pen.Width;
    int yLow = ChartControl.GetYByValue(this, 30);
    graphics.FillRectangle(fillBrush, lastXToFill, yHigh, firstXToFill - lastXToFill, yLow-yHigh);      
    base.Plot(graphics, bounds, min, max);
}

I have just written this down to explain the approach, I have not tested the code for bugs.

September 25th, 2013, 01:22 AM

Alternatively, if you want to color the space between the two lines over the entire chart, you could try

Code

public override void Plot(Graphics graphics, Rectangle bounds, double min, double max)
{
     if (Bars == null || ChartControl == null || this.LastBarIndexPainted < BarsRequired)
          return;
     SolidBrush fillBrush = new SolidBrush(fillColor);
     int firstXToFill = ChartControl.Bounds.Right;
     int lastXToFill = ChartControl.Bounds.Left;
     int yHigh = ChartControl.GetYByValue(this, 70) + (int)Lines[1].Pen.Width;
     int yLow = ChartControl.GetYByValue(this, 30);
     graphics.FillRectangle(fillBrush, lastXToFill, yHigh, firstXToFill - lastXToFill, yLow-yHigh);      
     base.Plot(graphics, bounds, min, max);
}

I assume that you declare fillColor in the variables section and also declare a property allowing you to change it.

September 25th, 2013, 11:21 PM

Fat Tails

Alternatively, if you want to color the space between the two lines over the entire chart, you could try

Code

public override void Plot(Graphics graphics, Rectangle bounds, double min, double max)
{
     if (Bars == null || ChartControl == null || this.LastBarIndexPainted < BarsRequired)
          return;
     SolidBrush fillBrush = new SolidBrush(fillColor);
     int firstXToFill = ChartControl.Bounds.Right;
     int lastXToFill = ChartControl.Bounds.Left;
     int yHigh = ChartControl.GetYByValue(this, 70) + (int)Lines[1].Pen.Width;
     int yLow = ChartControl.GetYByValue(this, 30);
     graphics.FillRectangle(fillBrush, lastXToFill, yHigh, firstXToFill - lastXToFill, yLow-yHigh);      
     base.Plot(graphics, bounds, min, max);
}

I assume that you declare fillColor in the variables section and also declare a property allowing you to change it.

@Fat Tails,

Most helpful, Thank you!

Little help with Draw Region

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Little help with Draw Region