View Source ExTDLib.Object.MaskPosition (ExTDLib v0.0.4)

Position on a photo where a mask is placed.

NameTypeDescription
pointMaskPointPart of the face, relative to which the mask is placed.
x_shiftdoubleShift by X-axis measured in widths of the mask scaled to the face size, from left to right. (For example, -1.0 will place the mask just to the left of the default mask position.)
y_shiftdoubleShift by Y-axis measured in heights of the mask scaled to the face size, from top to bottom. (For example, 1.0 will place the mask just below the default mask position.)
scaledoubleMask scaling coefficient. (For example, 2.0 means a doubled size.)

More details on telegram's documentation.