src/captors/sigma.captors.mouse.js
function _downHandler(e) {
      if (_settings('mouseEnabled')) {
        _startCameraX = _camera.x;
        _startCameraY = _camera.y;

        _lastCameraX = _camera.x;
        _lastCameraY = _camera.y;

        _startMouseX = sigma.utils.getX(e);
        _startMouseY = sigma.utils.getY(e);

        _hasDragged = false;
        _downStartTime = (new Date()).getTime();

        switch (e.which) {
          case 2:
            // Middle mouse button pressed
            // Do nothing.
            break;
          case 3:
            // Right mouse button pressed
            _self.dispatchEvent('rightclick',
              sigma.utils.mouseCoords(e, _startMouseX, _startMouseY));
            break;
          // case 1:
          default:
            // Left mouse button pressed
            _isMouseDown = true;

            _self.dispatchEvent('mousedown',
              sigma.utils.mouseCoords(e, _startMouseX, _startMouseY));
        }
      }
    }
function _downHandler(e) {
      if (_settings('mouseEnabled')) {
        _startCameraX = _camera.x;
        _startCameraY = _camera.y;

        _lastCameraX = _camera.x;
        _lastCameraY = _camera.y;

        _startMouseX = sigma.utils.getX(e);
        _startMouseY = sigma.utils.getY(e);

        _hasDragged = false;
        _downStartTime = (new Date()).getTime();

        switch (e.which) {
          case 2:
            // Middle mouse button pressed
            // Do nothing.
            break;
          case 3:
            // Right mouse button pressed
            _self.dispatchEvent('rightclick',
              sigma.utils.mouseCoords(e, _startMouseX, _startMouseY));
            break;
          // case 1:
          default:
            // Left mouse button pressed
            _isMouseDown = true;

            _self.dispatchEvent('mousedown',
              sigma.utils.mouseCoords(e, _startMouseX, _startMouseY));
        }
      }
    }
function _downHandler ( e ) { if ( _settings ( 'mouseEnabled' ) ) { _startCameraX = _camera . x ; _startCameraY = _camera . y ; _lastCameraX = _camera . x ; _lastCameraY = _camera . y ; _startMouseX = sigma . utils . getX ( e ) ; _startMouseY = sigma . utils . getY ( e ) ; _hasDragged = false ; _downStartTime = ( new Date ( ) ) . getTime ( ) ; switch ( e . which ) { case 2 : // Middle mouse button pressed // Do nothing. break ; case 3 : // Right mouse button pressed _self . dispatchEvent ( 'rightclick' , sigma . utils . mouseCoords ( e , _startMouseX , _startMouseY ) ) ; break ; // case 1: default : // Left mouse button pressed _isMouseDown = true ; _self . dispatchEvent ( 'mousedown' , sigma . utils . mouseCoords ( e , _startMouseX , _startMouseY ) ) ; } } }
The handler listening to the 'down' mouse event. It will start observing
the mouse position for dragging the graph.

@param {event} e A mouse event.
The handler listening to the down mouse event . It will start observing the mouse position for dragging the graph .