Language Reference Guide : System Classes : SegmentShape Class : Point1Y Attribute
 
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Point1Y Attribute
Data Type: integer
4GL Access: RW
The Point1Y attribute specifies the starting y-coordinate of the segment relative to the top of the parent field or form.
Point1Y is the first of the y points you specified when you created the line segment, not necessarily the uppermost point. (That is, you can draw a line from the top to the bottom or from the bottom to the top of the form.)