How to convert lines into a shape once drawing completed?
The diagram component provides us numerous features. The drawn lines(polyline or Bezier connectors) can be converted into a shape. This document explains how to convert the drawn lines into shape. Initially add N number of polylines or Bezier curves to the diagram. The line’s source point and target point plays a vital role in converting the lines to shape. The following code sample explains how the lines’ source point and target point is converted into a shape’s path.
let path: string = 'M';
for (let i: number = 0; i < diagram.selectedItems.connectors.length; i++) {
if (i === 0) {
if (diagram.selectedItems.connectors[i].type === 'Bezier') {
path = path + String(diagram.selectedItems.connectors[i].sourcePoint.x) + ',' +
String(diagram.selectedItems.connectors[i].sourcePoint.y);
path = path + ' C' + String((diagram.selectedItems.connectors[i].segments[0] as BezierSegmentModel).point1.x) + ',' +
String((diagram.selectedItems.connectors[i].segments[0] as BezierSegmentModel).point1.y) + ' ';
path = path + String((diagram.selectedItems.connectors[i].segments[0] as BezierSegmentModel).point2.x) + ',' +
String((diagram.selectedItems.connectors[i].segments[0] as BezierSegmentModel).point2.y) + ' ';
path = path + String(diagram.selectedItems.connectors[i].targetPoint.x) + ',' +
String(diagram.selectedItems.connectors[i].targetPoint.y);
} else {
let points: PointModel[] = (diagram.selectedItems.connectors[i] as Connector).intermediatePoints;
path = path + String(points[0].x) + ',' + String(points[0].y);
for (let j: number = 1; j < points.length; j++) {
path = path + ' L' + String(points[j].x) + ',' + String(points[j].y);
}
}
} else {
if (diagram.selectedItems.connectors[i].type === 'Bezier') {
path = path + ' C' + String((diagram.selectedItems.connectors[i].segments[0] as BezierSegmentModel).point1.x) + ',' +
String((diagram.selectedItems.connectors[i].segments[0] as BezierSegmentModel).point1.y) + ' ';
path = path + String((diagram.selectedItems.connectors[i].segments[0] as BezierSegmentModel).point2.x) + ',' +
String((diagram.selectedItems.connectors[i].segments[0] as BezierSegmentModel).point2.y) + ' ';
path = path + String(diagram.selectedItems.connectors[i].targetPoint.x) + ',' +
String(diagram.selectedItems.connectors[i].targetPoint.y);
} else {
let points: PointModel[] = (diagram.selectedItems.connectors[i] as Connector).intermediatePoints;
path = path + ' L' + String(points[0].x) + ',' + String(points[0].y);
for (let j: number = 1; j < points.length; j++) {
path = path + ' L' + String(points[j].x) + ',' + String(points[j].y);
}
}
}
}
Initially, 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 is explained as follows,
M = moveto - Set a new current point.
C = curveto - Draw a curve.
L = lineto - Draw a straight line.
diagram.group();
for (let j: number = 0; j < diagram.nodes.length; j++) {
if (diagram.nodes[j].children) {
offsetX = diagram.nodes[j].offsetX;
offsetY = diagram.nodes[j].offsetY;
}
}
diagram.remove();
node = {id: 'shape', shape: { type: 'Path', data: path }, offsetY: offsetY, offsetX: offsetX };
diagram.add(node);
After getting path the diagram is grouped. The offsetX and offsetY of the node with the children are used to place the converted shape. Finally, the lines drawn are added as a shape in the diagram.
Sample
https://stackblitz.com/edit/typescript-sapyad?file=index.html,index.ts
Conclusion
I hope you enjoyed learning about how to convert lines into a shape once drawing completed.
You can refer to our JavaScript Diagram feature tour page to know about its other groundbreaking feature representations and documentation, and how to quickly get started for configuration specifications. You can also explore our JavaScript Diagram example to understand how to create and manipulate data.
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