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Sheets.Shapes.LinearGradientFillDirection
形状的线性渐变填充方向
• bottomLeftToTopRight = 315
从左下到右上
• bottomRightToTopLeft = 225
从右下到左上
• linearDown = 90
线性向下
• linearLeft = 180
线性向左
• linearRight = 0
线性向右
• linearUp = 270
线性上升
• topLeftToBottomRight = 45
从左上到右下
• topRightToBottomLeft = 135
从右上到右下