# all files / Github/bpmn-js/lib/features/grid-snapping/behavior/ AutoPlaceBehavior.js

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     import { getNewShapePosition } from '../../auto-place/AutoPlaceUtil';

    import { getMid } from 'diagram-js/lib/layout/LayoutUtil';
    import { is } from '../../../util/ModelUtil';

    export default function AutoPlaceBehavior(eventBus, gridSnapping) {
      eventBus.on('autoPlace', function(context) {
        var source = context.source,
            sourceMid = getMid(source),
            shape = context.shape;

        var position = getNewShapePosition(source, shape);

        [ 'x', 'y' ].forEach(function(axis) {
          var options = {};

          // do not snap if x/y equal
          if (position[ axis ] === sourceMid[ axis ]) {
            return;
          }

          if (position[ axis ] > sourceMid[ axis ]) {
            options.min = position[ axis ];
          } else {
            options.max = position[ axis ];
          }

          if (is(shape, 'bpmn:TextAnnotation')) {

            if (isHorizontal(axis)) {
              options.offset = -shape.width / 2;
            } else {
              options.offset = -shape.height / 2;
            }

          }

          position[ axis ] = gridSnapping.snapValue(position[ axis ], options);

        });

        // must be returned to be considered by auto place
        return position;
      });
    }

    AutoPlaceBehavior.$inject = [
      'eventBus',
      'gridSnapping'
    ];

    // helpers //////////

    function isHorizontal(axis) {
      return axis === 'x';
    }