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Layers in Vue Diagram component

14 Oct 2021 / 6 minutes to read

Layer is used to organize related shapes on a diagram control. A layer is a named category of shapes. By assigning shapes to different layers, you can selectively view, remove, and lock different categories of shapes.

In diagram, Layers provide a way to change the properties of all shapes that have been assigned to that layer. The following properties can be set.

  • Visible
  • Lock
  • Objects
  • AddInfo

Visible

The layer’s visible property is used to control the visibility of the elements assigned to the layer.

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let nodes = [{
id: 'node1',
    width: 100,
    height: 100,
    offsetX: 100,
    offsetY: 100,
    annotations: [{
        content: 'Default Shape'
    }]
},
{
    id: 'node2',
    width: 100,
    height: 100,
    offsetX: 300,
    offsetY: 100,
    shape: {
        type: 'Path',
        data: 'M540.3643,137.9336L546.7973,159.7016L570.3633,159.7296L550.7723,171.9366L558.9053,194.9966L540.3643,' +
            '179.4996L521.8223,194.9966L529.9553,171.9366L510.3633,159.7296L533.9313,159.7016L540.3643,137.9336z'
    },
    annotations: [{
        content: 'Path Element'
    }]
}
];
let connectors: ConnectorModel[] = [{
id: 'connector1',
type: 'Straight',
sourcePoint: {
    x: 100,
    y: 300
},
targetPoint: {
    x: 200,
    y: 400
},
}];
export default {
name: 'app'
data() {
return {
    width: "100%",
    height: "350px",
    nodes: nodes,
    layers: [{
        id: 'layer1',
        visible: true,
        objects: ['node1', 'node2', 'connector1']
    }]
}
}}

Lock

The layer’s lock property is used to prevent or allow changes to the elements dimension and position.

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let nodes = [{
id: 'node1',
    width: 100,
    height: 100,
    offsetX: 100,
    offsetY: 100,
    annotations: [{
        content: 'Default Shape'
    }]
},
{
    id: 'node2',
    width: 100,
    height: 100,
    offsetX: 300,
    offsetY: 100,
    shape: {
        type: 'Path',
        data: 'M540.3643,137.9336L546.7973,159.7016L570.3633,159.7296L550.7723,171.9366L558.9053,194.9966L540.3643,' +
            '179.4996L521.8223,194.9966L529.9553,171.9366L510.3633,159.7296L533.9313,159.7016L540.3643,137.9336z'
    },
    annotations: [{
        content: 'Path Element'
    }]
}
];
let connectors: ConnectorModel[] = [{
id: 'connector1',
type: 'Straight',
sourcePoint: {
    x: 100,
    y: 300
},
targetPoint: {
    x: 200,
    y: 400
},
}];
export default {
name: 'app'
data() {
return {
    width: "100%",
    height: "350px",
    nodes: nodes,
    layers: [{
        id: 'layer1',
        visible: true,
        objects: ['node1'],
        lock: true
    },
    {
        id: 'layer2',
        visible: true,
        objects: ['node2', 'connector1'],
        lock: false
    }]
}
}}

Objects

The layer’s objects property defines the diagram elements to the layer.

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let nodes = [{
id: 'node1',
    width: 100,
    height: 100,
    offsetX: 100,
    offsetY: 100,
    annotations: [{
        content: 'Default Shape'
    }]
},
{
    id: 'node2',
    width: 100,
    height: 100,
    offsetX: 300,
    offsetY: 100,
    shape: {
        type: 'Path',
        data: 'M540.3643,137.9336L546.7973,159.7016L570.3633,159.7296L550.7723,171.9366L558.9053,194.9966L540.3643,' +
            '179.4996L521.8223,194.9966L529.9553,171.9366L510.3633,159.7296L533.9313,159.7016L540.3643,137.9336z'
    },
    annotations: [{
        content: 'Path Element'
    }]
}
];
let connectors: ConnectorModel[] = [{
id: 'connector1',
type: 'Straight',
sourcePoint: {
    x: 100,
    y: 300
},
targetPoint: {
    x: 200,
    y: 400
},
}];
export default {
name: 'app'
data() {
return {
    width: "100%",
    height: "350px",
    nodes: nodes,
    layers: [{
        id: 'layer1',
        visible: true,
        objects: ['node1', 'node2', 'connector1'],
        lock: true
    }]
}
}}

AddInfo

The addInfo property of layers allow you to maintain additional information to the layers.

The following code illustrates how to add additional information to the layers.

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let nodes = [{
id: 'node1',
    width: 100,
    height: 100,
    offsetX: 100,
    offsetY: 100,
    annotations: [{
        content: 'Default Shape'
    }]
},
{
    id: 'node2',
    width: 100,
    height: 100,
    offsetX: 300,
    offsetY: 100,
    shape: {
        type: 'Path',
        data: 'M540.3643,137.9336L546.7973,159.7016L570.3633,159.7296L550.7723,171.9366L558.9053,194.9966L540.3643,' +
            '179.4996L521.8223,194.9966L529.9553,171.9366L510.3633,159.7296L533.9313,159.7016L540.3643,137.9336z'
    },
    annotations: [{
        content: 'Path Element'
    }]
}
];
let connectors: ConnectorModel[] = [{
id: 'connector1',
type: 'Straight',
sourcePoint: {
    x: 100,
    y: 300
},
targetPoint: {
    x: 200,
    y: 400
},
}];
let addInfo: Object = { Description: 'Layer1' };
export default {
name: 'app'
data() {
return {
    width: "100%",
    height: "350px",
    nodes: nodes,
    layers: [{
        id: 'layer1',
        visible: true,
        objects: ['node1', 'node2', 'connector1'],
        addInfo: addInfo
    }]
}
}}

Add layer at runtime

Layers can be added at runtime by using the addLayer public method.

The layer’s ID property defines the ID of the layer, and its further used to find the layer at runtime and do any customization.

The following code illustrates how to add a layer.

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export default {
name: 'app'
data() {
    return {
        width: "100%",
        height: "350px",
    }
}
mounted: function() {
    let diagramInstance: Diagram;
    let diagramObj: any = document.getElementById("diagram");
    diagramInstance = diagramObj.ej2_instances[0];
    // add the layers to the existing diagram layer collection
    diagram.addLayer({
        id: 'newlayer',
        objects: [],
        visible: true,
        lock: false,
        zIndex: -1
    }, [{
        type: 'Straight',
        sourcePoint: {
            x: 100,
            y: 300
        },
        targetPoint: {
            x: 200,
            y: 400
        }
    }]);
}
}

Remove layer at runtime

Layers can be removed at runtime by using the removeLayer public method.

The following code illustrates how to remove a layer.

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export default {
name: 'app'
data() {
    return {
        width: "100%",
        height: "350px",
    }
}
mounted: function() {
    let diagramInstance: Diagram;
    let diagramObj: any = document.getElementById("diagram");
    diagramInstance = diagramObj.ej2_instances[0];
    // remove the diagram layers
    diagram.removeLayer([diagram.model.layers[i]]);
}
}

moveObjects

Objects of the layers can be moved by using the moveObjects public method.

The following code illustrates how to move objects from one layer to another layer from the diagram.

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export default {
name: 'app'
data() {
    return {
        width: "100%",
        height: "350px",
    }
}
mounted: function() {
    let diagramInstance: Diagram;
    let diagramObj: any = document.getElementById("diagram");
    diagramInstance = diagramObj.ej2_instances[0];
    // move the objects of diagram layers
    diagram.moveObjects(['connector1'], 'layer2');
}
}

bringLayerForward

Layers can be moved forward at runtime by using the bringLayerForward public method.

The following code illustrates how to bring forward to layer.

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export default {
name: 'app'
data() {
    return {
        width: "100%",
        height: "350px",
    }
}
mounted: function() {
    let diagramInstance: Diagram;
    let diagramObj: any = document.getElementById("diagram");
    diagramInstance = diagramObj.ej2_instances[0];
    // move the layer forward
    diagram.bringLayerForward('layer1');
}
}

sendLayerBackward

Layers can be moved backward at runtime by using the sendLayerBackward public method.

The following code illustrates how to send backward to layer.

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export default {
name: 'app'
data() {
    return {
        width: "100%",
        height: "350px",
    }
}
mounted: function() {
    let diagramInstance: Diagram;
    let diagramObj: any = document.getElementById("diagram");
    diagramInstance = diagramObj.ej2_instances[0];
    // move the layer backward
    diagram.sendLayerBackward('layer1');
}
}

cloneLayer

Layers can be cloned with its object by using the cloneLayer public method.

The following code illustrates how to bring forward to layer.

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export default {
name: 'app'
data() {
    return {
        width: "100%",
        height: "350px",
    }
}
mounted: function() {
    let diagramInstance: Diagram;
    let diagramObj: any = document.getElementById("diagram");
    diagramInstance = diagramObj.ej2_instances[0];
    // clone a layer with its object
    diagram.cloneLayer('layer2');
}
}

getActiveLayer

To get the active layers back in diagram, use the getActiveLayer public method.

The following code illustrates how to bring forward to layer.

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export default {
name: 'app'
data() {
    return {
        width: "100%",
        height: "350px",
    }
}
mounted: function() {
    let diagramInstance: Diagram;
    let diagramObj: any = document.getElementById("diagram");
    diagramInstance = diagramObj.ej2_instances[0];
    // gets the active layer back
    diagram.getActiveLayer();
}
}

setActiveLayer

Set the active layer by using the setActiveLayer public method.

The following code illustrates how to bring forward to layer.

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export default {
name: 'app'
data() {
    return {
        width: "100%",
        height: "350px",
    }
}
mounted: function() {
    let diagramInstance: Diagram;
    let diagramObj: any = document.getElementById("diagram");
    diagramInstance = diagramObj.ej2_instances[0];
    // set the active layer
    //@param layerName defines the name of the layer which is to be active layer
    diagram.setActiveLayer('layer2');
}
}