DashRouteArrowScaleExpressions
constructor(arrowheadScalingExpression: Expression? = literal(0.5), arrowheadCasingScalingExpression: Expression? = literal(0.7), arrowShaftScalingExpression: Expression? = routeArrowShaftScalingExpression(0.5), arrowShaftCasingScalingExpression: Expression? = routeArrowShaftCasingScalingExpression(0.7))