How to Draw dashed line NT 8

[afshinmoshrefi]

I want to draw dashed lines using but cannot find a working example.
Reference points to Stroke class but it is not a recognized class. Under NT7 I used DashStyle to draw dashed lines.

[NinjaTrader_ChelseaB]

Hello afshinmoshrefi,

When using Draw.Line(), a DashStyleHelper can be used.

For example:

Draw.Line(this, "lineTag", true, 10, Low[10] - 3 * TickSize, 0, High[0] + 3 * TickSize, Brushes.Blue, [B]DashStyleHelper.Dash[/B], 2);

Draw.Line(NinjaScriptBase owner, string tag, bool isAutoScale, int startBarsAgo, double startY, int endBarsAgo, double endY, Brush brush, DashStyleHelper dashStyle, int width)

http://ninjatrader.com/support/helpGuides/nt8/en-us/draw_line.htm

[afshinmoshrefi]

I need to use : RenderTarget.DrawLine

I need to use RenderTarget.DrawLine

This is the format in the docs :

RenderTarget.DrawLine(Vector2 point0, Vector2 point1, Brush brush, float strokeWidth, StrokeStyle strokeStyle)

However StrokeStyle isn't a recognized class.

The example below copied from the documents is incomplete and does not work:




Vector2 point0 = new Vector2();
Vector2 point1 = new Vector2();

point0.X = point0X;
point0.Y = point0Y;
point1.X = point1X;
point1.Y = point1Y;

RenderTarget.DrawLine(point0, point1, Stroke.BrushDX, Stroke.Width, Stroke.StrokeStyle);

[NinjaTrader_ChelseaB]

Hello afshinmoshrefi,

It appears you are trying to get values from a type and not from an object.

Stroke is a type.

Try making a new stroke object and getting the values from that.

Stroke aStroke = new Stroke(Brushes.Blue, DashStyleHelper.Dash, 2);
RenderTarget.DrawLine(point0, point1, aStroke.BrushDX, aStroke.Width, aStroke.StrokeStyle);

[afshinmoshrefi]

getting memory corruption error

Just tried your lines inside OnRender in a test indicator - attached

SharpDX.Vector2 pp1 = new SharpDX.Vector2(0, chartScale.GetYByValue(2135));
SharpDX.Vector2 pp2 = new SharpDX.Vector2(1300, chartScale.GetYByValue(2135));

Stroke aStroke = new Stroke(Brushes.Blue, DashStyleHelper.Dash, 2);
RenderTarget.DrawLine(pp1, pp2, aStroke.BrushDX, aStroke.Width, aStroke.StrokeStyle);

It compiles but gets the following run time error:

Visual Studio shows the following :

An exception of type 'System.AccessViolationException' occurred in SharpDX.Direct2D1.dll but was not handled in user code

Additional information: Attempted to read or write protected memory. This is often an indication that other memory is corrupt.

[NinjaTrader_Matthew]

Just tried your lines inside OnRender in a test indicator - attached

SharpDX.Vector2 pp1 = new SharpDX.Vector2(0, chartScale.GetYByValue(2135));
SharpDX.Vector2 pp2 = new SharpDX.Vector2(1300, chartScale.GetYByValue(2135));

Stroke aStroke = new Stroke(Brushes.Blue, DashStyleHelper.Dash, 2);
RenderTarget.DrawLine(pp1, pp2, aStroke.BrushDX, aStroke.Width, aStroke.StrokeStyle);

It compiles but gets the following run time error:

Visual Studio shows the following :

An exception of type 'System.AccessViolationException' occurred in SharpDX.Direct2D1.dll but was not handled in user code

Additional information: Attempted to read or write protected memory. This is often an indication that other memory is corrupt.

Make sure to set the RenderTarget property before using the stroke

Stroke aStroke = new Stroke(Brushes.Blue, DashStyleHelper.Dash, 2);

aStroke.RenderTarget = RenderTarget;

RenderTarget.DrawLine(pp1, pp2, aStroke.BrushDX, aStroke.Width, aStroke.StrokeStyle);

http://ninjatrader.com/support/helpGuides/nt8/en-us/stroke_class.htm

[afshinmoshrefi]

It worked

Thank you. That worked.
Is creating Stroke object the only way to draw a dashed line using RenderTarget.DrawLine?

[NinjaTrader_Matthew]

Thank you. That worked.
Is creating Stroke object the only way to draw a dashed line using RenderTarget.DrawLine?

You do not need to use the NinjaTrader.Gui.Stroke.

You can use your own Direct2D1.StrokeStyle

http://ninjatrader.com/support/helpGuides/nt8/en-us/sharpdx_direct2d1_strokestyle.htm

Attached is an example of creating a custom sharpdx StrokeStyle object using a StrokeStyleProperties struct.