# Using-Angles-and-Setting-Up-Points

Using Angles and Setting Up Points

# Using Angles and Setting Up Points

There are still a couple of issues remaining. First, you need to figure out how to
draw the path at any angle the user specifies. From the gp:getPointInput function, you can easily establish the primary angle of the path. To draw it, you
need a couple of additional vectors perpendicular to the primary angle. This is where the Degrees-Radians function is useful. The following code fragment demonstrates how you can set up your
two perpendicular vectors using the PathAngle variable as an argument passed to the Degrees-Radians function:

```(setq angp90 (+ PathAngle (Degrees-Radians 90))

With the data you now have in hand, you can establish the four corner points of the
path using polar function: ```(setq p1 (polar StartPt angm90 HalfWidth)
p2 (polar p1 PathAngle PathLength)
p3 (polar p2 angp90 Width)
p4 (polar p3 (+ PathAngle (Degrees-Radians 180))```

The polar function returns a 3D point at a specified angle and distance from a point. For instance,
polar locates p2 by projecting p1 a distance of PathLength along a vector oriented at an angle of PathAngle, counter-clockwise from the x-axis.

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