触控板交互位置的标准化坐标。
(0, 0) 是触控板的静止位置，或者表示当前未触摸触控板。每个组件都位于 [-1, 1] 范围内。-1 对应于 x 轴的左侧，y 轴的下方；1 对应于 x 轴的右侧，y 轴的上方。
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