成员变量 类型: String # static readonly arrow LineMarkerPlacement.arrow 箭头 Default Value: 'arrow' 类型: String # static readonly circle LineMarkerPlacement.circle 圆形 Default Value: 'circle' 类型: String # static readonly cross LineMarkerPlacement.cross 十字 Default Value: 'cross' 类型: String # static readonly diamond LineMarkerPlacement.diamond 菱形 Default Value: 'diamond' 类型: String # static readonly square LineMarkerPlacement.square 正方形 Default Value: 'square' 类型: String # static readonly x LineMarkerPlacement.x x Default Value: 'x'