InterY, interpolatey, yinter
Calling convention:
- intery parameters described below
- interpolatey
- yinter
Parameter formats:
- (block 1st point, block 2nd point, value x)
- (value x1, value y1, value x2, value y2, value x)
Returns the y coordinate where the x-coordinate equals x along the line formed by either (x1, y1) - (x2, y2) or 1st point to 2nd point.