Position of the active color component in the ramp. This attribute applies to the active color only. The range is 0 (bottom of ramp) to 1 (top of ramp).

• 渐变的当前颜色部分的位置。此属性仅仅应用于这当前颜色。范围从0(底部渐变)到1(顶端渐变)。