maxGraph/packages/html/stories/Perimeter.stories.js

import { Graph, RubberBandHandler, GraphView, mathUtils } from '@maxgraph/core';

import { globalTypes } from '../.storybook/preview';

export default {
  title: 'Labels/Perimeter',
  argTypes: {
    ...globalTypes,
    rubberBand: {
      type: 'boolean',
      defaultValue: true,
    },
  },
};

const Template = ({ label, ...args }) => {
  const container = document.createElement('div');
  container.style.position = 'relative';
  container.style.overflow = 'hidden';
  container.style.width = `${args.width}px`;
  container.style.height = `${args.height}px`;
  container.style.background = 'url(/images/grid.gif)';
  container.style.cursor = 'default';

  // Redirects the perimeter to the label bounds if intersection
  // between edge and label is found
  const mxGraphViewGetPerimeterPoint = GraphView.prototype.getPerimeterPoint;
  GraphView.prototype.getPerimeterPoint = function (terminal, next, orthogonal, border) {
    let point = mxGraphViewGetPerimeterPoint.apply(this, arguments);

    if (point != null) {
      const perimeter = this.getPerimeterFunction(terminal);

      if (terminal.text != null && terminal.text.boundingBox != null) {
        // Adds a small border to the label bounds
        const b = terminal.text.boundingBox.clone();
        b.grow(3);

        if (mathUtils.rectangleIntersectsSegment(b, point, next)) {
          point = perimeter(b, terminal, next, orthogonal);
        }
      }
    }

    return point;
  };

  // Creates the graph inside the given container
  const graph = new Graph(container);
  graph.setVertexLabelsMovable(true);
  graph.setConnectable(true);

  // Uncomment the following if you want the container
  // to fit the size of the graph
  // graph.setResizeContainer(true);

  // Enables rubberband selection
  if (args.rubberBand) new RubberBandHandler(graph);

  // Gets the default parent for inserting new cells. This
  // is normally the first child of the root (ie. layer 0).
  const parent = graph.getDefaultParent();

  // Adds cells to the model in a single step
  graph.batchUpdate(() => {
    const v1 = graph.insertVertex(parent, null, 'Label', 20, 20, 80, 30, {
      verticalLabelPosition: 'bottom',
    });
    const v2 = graph.insertVertex(parent, null, 'Label', 200, 20, 80, 30, {
      verticalLabelPosition: 'bottom',
    });
    const v3 = graph.insertVertex(parent, null, 'Label', 20, 150, 80, 30, {
      verticalLabelPosition: 'bottom',
    });
    var e1 = graph.insertEdge(parent, null, '', v1, v2);
    var e1 = graph.insertEdge(parent, null, '', v1, v3);
  });

  return container;
};

export const Default = Template.bind({});