if (regionWidth >= 10 && context.dragDirection == Dygraph.HORIZONTAL) {
        g.doZoomX_(Math.min(context.dragStartX, context.dragEndX),
            Math.max(context.dragStartX, context.dragEndX));
        context.cancelNextDblclick = true;
    } else if (regionHeight >= 10 && context.dragDirection == Dygraph.VERTICAL) {