Finding Shapes in Page

In This Topic

NOV Diagram lets you easily find shapes in a page using shape filters. Shape filters are classes that implement the INFilter<NShape> interface.

Commonly Used Shape Filters

The most commonly used filters are placed in the static class NDiagramFilters:

ShapeType2D - filters all 2D shapes, i.e. shapes whose ShapeType is 2D.
ShapeType1D - filters all 1D shapes, i.e. shapes whose ShapeType is 1D.
ShapeRoutableConnector - filters all routable connectors shapes, i.e. shapes that are or inherit from NRoutableConnector.
ShapeConnector - filters all connectors, i.e. 1D shapes whose UserClass is set to "Connector".
ShapeGraphEdge - filters all 1D shapes whose GraphPart property is set to true.
ShapeGraphVertex - filters all 2D shapes whose GraphPart property is set to true.

To find shapes in a page, use the GetShapes method of the page passing a shape filter like the ones mentioned above or an instance of any class that implements the INFilter<NShape> interface. For example to get all 2D shapes in the active page of a drawing use the following piece of code:

Get all 2D shapes in the active page of a drawing	Copy Code
bool includeGroupedShapes = true; NList<NShape> shapes = drawingView.ActivePage.GetShapes(includeGroupedShapes, NDiagramFilters.ShapeType2D);

Included Shape Filter Classes

You can also use the following filter classes included in NOV Diagram:

NShapeNameFilter - filters shapes whose Name property is equal to a given value.
NShapeTextFilter - filters shapes whose Text property is equal to a given value.
NUserClassFilter - filters shapes whose UserClass property is equal to a given value.

For example to find all shapes whose text is equal to "My Shape", use the following piece of code:

Get all 2D shapes in the active page of a drawing	Copy Code
bool includeGroupedShapes = true; NList<NShape> shapes = drawingView.ActivePage.GetShapes(includeGroupedShapes, new NShapeTextFilter("My Shape"));

Custom Shape Filters

You can easily create a class that implements the INFilter<NShape> interface to make a custom search on the shapes in a page. For example, the class ShapeFillFilter below will find all shapes that are filled with a given color:

Shape fill filter	Copy Code
class ShapeFillFilter : INFilter<NShape> { public ShapeFillFilter(NColor color) { m_Color = color; } public bool Filter(NShape shape) { if (shape.GeometryNoCreate == null) return false; NColorFill colorFill = shape.GeometryNoCreate.Fill as NColorFill; if (colorFill == null) return false; return colorFill.Color == m_Color; } private NColor m_Color; }

Shape fill filter

Copy Code

class ShapeFillFilter : INFilter<NShape>
{
    public ShapeFillFilter(NColor color)
    {
        m_Color = color;
    }

    public bool Filter(NShape shape)
    {
        if (shape.GeometryNoCreate == null)
            return false;

        NColorFill colorFill = shape.GeometryNoCreate.Fill as NColorFill;
        if (colorFill == null)
            return false;

        return colorFill.Color == m_Color;
    }

    private NColor m_Color;
}

To find all shapes filled with red, use the class above in the following way:

Find all shapes filled with red	Copy Code
bool includeGroupedShapes = true; NList<NShape> shapes = drawingView.ActivePage.GetShapes(includeGroupedShapes, new ShapeFillFilter(NColor.Red));

DataStructures

Filters