How to convert lines into a shape once drawing completed in Vue Diagram?

This article explains how to convert lines into a shape once the drawing is completed in Vue Diagram. In Vue Diagram, we can convert the drawn lines into shapes by using the group feature. The drawn lines (polyline or Bezier connectors) can be converted into shapes. Initially, add N number of polylines or Bezier curves to the diagram. The line’s source point and target point play a vital role in converting the lines into shapes. The following code sample explains how the lines’ source point and target point are converted into a shape’s path.

let node;
   let offsetX;
   let offsetY;
   let path = 'M';
   for (let i = 0; i <diagramInstance.selectedItems.connectors.length; i++) {
       if (i === 0) {
           if (diagramInstance.selectedItems.connectors[i].type === 'Bezier') {
               path = path + String(diagramInstance.selectedItems.connectors[i].sourcePoint.x) + ',' +
                   String(diagramInstance.selectedItems.connectors[i].sourcePoint.y);
               path = path + ' C' + String((diagramInstance.selectedItems.connectors[i].segments[0] ).point1.x) + ',' +
                   String((diagramInstance.selectedItems.connectors[i].segments[0] ).point1.y) + ' ';
               path = path + String((diagramInstance.selectedItems.connectors[i].segments[0] ).point2.x) + ',' +
                   String((diagramInstance.selectedItems.connectors[i].segments[0] ).point2.y) + ' ';
               path = path + String(diagramInstance.selectedItems.connectors[i].targetPoint.x) + ',' +
                   String(diagramInstance.selectedItems.connectors[i].targetPoint.y);
           } else {
               let points = (diagramInstance.selectedItems.connectors[i]).intermediatePoints;
               path = path + String(points[0].x) + ',' + String(points[0].y);
               for (let j = 1; j < points.length; j++) {
                   path = path + ' L' + String(points[j].x) + ',' + String(points[j].y);
               }
           }
       } else {
           if (diagramInstance.selectedItems.connectors[i].type === 'Bezier') {
               path = path + ' C' + String((diagramInstance.selectedItems.connectors[i].segments[0] ).point1.x) + ',' +
                   String((diagramInstance.selectedItems.connectors[i].segments[0] ).point1.y) + ' ';
               path = path + String((diagramInstance.selectedItems.connectors[i].segments[0] ).point2.x) + ',' +
                   String((diagramInstance.selectedItems.connectors[i].segments[0] ).point2.y) + ' ';
               path = path + String(diagramInstance.selectedItems.connectors[i].targetPoint.x) + ',' +
                   String(diagramInstance.selectedItems.connectors[i].targetPoint.y);
           } else {
               let points = (diagramInstance.selectedItems.connectors[i]).intermediatePoints;
               path = path + ' L' + String(points[0].x) + ',' + String(points[0].y);
               for (let j = 1; j < points.length; j++) {
                   path = path + ' L' + String(points[j].x) + ',' + String(points[j].y);
               }
           }
       }
   }

Then a variable path is declared, which is used to store the path data of the lines drawn. This path data is converted into a shape. The path data draws an SVG shape. The commands used to draw the shape in the above code sample are explained as follows,

M = moveto - Set a new current point.

C = curveto - Draw a curve.

L = lineto - Draw a straight line.

diagramInstance.group();
   for (let j = 0; j <diagramInstance.nodes.length; j++) {
       if (diagramInstance.nodes[j].children) {
           offsetX =diagramInstance.nodes[j].offsetX;
           offsetY =diagramInstance.nodes[j].offsetY;
       }
   }

After getting path the diagram is grouped. The offsetX and offsetY of the node with the children are used to place the converted shape, then remove the drawn lines. Finally, the lines drawn are added as a shape in the diagram.

diagramInstance.remove();
   node = { id: 'shape', shape: { type: 'Path', data: path }, offsetY: offsetY, offsetX: offsetX };
  diagramInstance.add(node);
  diagramInstance.dataBind();

Refer to the working sample for additional details and implementation: Sample

Conclusion

We hope you enjoyed learning about how to convert lines into a shape once drawing completed in Vue Diagram.

You can refer to our Vue Diagram feature tour page to learn about its other groundbreaking feature representations and documentation, and how to quickly get started with configuration specifications. You can also explore our Vue Diagram example to understand how to create and manipulate data.

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