This example shows how to draw shapes and connections interactively. In addition to that, rulers, gridlines, and snapping options are enabled to assist drawing. The tool property can be used to enable drawing. Add DrawOnce or ContinousDraw option to the tool property of the diagram. The drawingObject property can be used to define a shape/connector to be drawn. Few shape and connector templates are added in the palette. To draw basic shapes and connectors, click the templates in the palette. For polygon shapes, a corner/point will be added to the polygon for each mouse left button click. Drawing will be completed either on mouse right button click or double click. Injecting Module The diagram component’s features are segregated into individual feature-wise modules. To enable undo and redo support, inject UndoRedo module into @NgModule.providers section.