Nevron Open Vision Documentation
Drawing View and Drawing Document

About Drawing Views and Drawing Documents

A drawing document is represented by the NDrawingDocument class, which derives from the NGenericDocument<NDrawing>, which essentially means that the content of a drawing document is an instance of the NDrawing class, which represents a diagram drawing (see Drawings for more information).

The drawing view is represented by the NDrawingView class, which is essentially a widget that is designed to display the content of a drawing document. In this way you can integrate a drawing inside any NOV UI hierarchy (see UI Overview for more info).

The drawing document displayed by the drawing view is accessible via the Document property. When a drawing view is created, it by default also creates an empty drawing document inside it.

The following code creates a drawing view, the document of which has some shapes and is placed inside a stack panel.

Drawing View Example
Copy Code
// create a stack panel
NStackPanel stack = new NStackPanel();
stack.Add(new NButton("Some Button"));

// add a drawing view in the stack panel
NDrawingView drawingView = new NDrawingView();

// get the drawing view document and its active page
NDrawingDocument document = drawingView.Document;
NPage activePage = document.Content.ActivePage;

// add a rectangle shape to the active page items
NShape rectangleShape = new NBasicShapesFactory().CreateShape(ENBasicShapes.Rectangle);
rectangleShape.Text = "My First Shape";
Drawing View Tools

The drawing view Interactor is populated with tools that perform different actions upon the drawing view and its content (see the Interactors topic for a fundamental overview of interactors).

All tools that reside inside in the drawing view Interactor are defined in the Nevron.Nov.Diagram.DrawingTools namespace. Following is a brief overview:

Tool Class Description

General Tools


A composite tool that aggregates the following atomic tools:

- creates a horizontal or vertical guideline, if the drags from the drawing view rulers.
NDragHandleTool - implements the interactive dragging of handles.
NClickSelectTool - selects the clicked shape
NRectangleSelectTool - selects the set of shape hit by a visually defined rectangle.
NMoveTool - moves the currently selected shapes

NPanTool A tool that implements interactive panning (scrolling) of the currently active page.

Create Element Tools

NCreateRectangleTool Creates a rectangle shape inside the active page
NCreateEllipseTool Creates an ellipse shape inside the active page
NCreateLineTool Creates either a line segment that continues a previously drawn open figure, or creates a simple line shape.
NCreateCubicBezierTool Creates either a cubic bezier segment that continues a previously drawn open figure, or creates a simple cubic bezier shape.
NCreateArcTool Creates either an arc segment that continues a previously drawn open figure, or creates a simple arc shape.
NCreateEllipticalArcTool Creates either an elliptical arc segment that continues a previously drawn open figure, or creates a simple elliptical arc shape.
NCreateConnectorTool Creates a routable connector
NCreateTextTool Creates a text shape

Ambient Tools

NContextMenuTool Shows a context menu for the currently selected page items.
NScrollAndZoomTool Implements mouse wheel scrolling and zooming of the active page.
NInplaceEditTool Starts in-place editing of the shape that is double clicked.
NDragDropTargetTool Extends the Drop target functionality of drawing views, by providing them with the ability to handle dropped library clippings, text, images etc.

Drawing View Commands

The drawing view Commander is populated with commands that perform different actions upon the drawing view and its content (see the Commanding topic for a fundamental overview of commands).

All commands that reside inside in the drawing view Commander are defined in the Nevron.Nov.Diagram.DrawingCommands namespace.

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