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Chapter 3 - Mathematical and Logical Utilities / Mathematical and Logical Utilities Reference
Routines / Converting Between Angle and Slope Values

### SlopeFromAngle

You can convert an angle value to a slope value using the `SlopeFromAngle` function.

```FUNCTION SlopeFromAngle (angle: Integer): Fixed;
```
`angle`
The angle, expressed in clockwise degrees from 12 o'clock and treated `MOD` 180. (90 degrees is thus at 3 o'clock and -90 degrees is at 9 o'clock.)
##### DESCRIPTION
The `SlopeFromAngle` function returns the slope corresponding to the angle specified in the `angle` parameter. Slopes are defined as Dx/Dy, the horizontal change divided by the vertical change between any two points on a line with the given angle. The negative y-axis is defined as being at 12 o'clock, and the positive y-axis at 6 o'clock. The x-axis is defined as usual, with the positive side defined as being at 3 o'clock.

For an example of the use of the `SlopeFromAngle` function, see Figure 3-7 on page 3-13.         Get information on Apple products. Visit the Apple Store online or at retail locations. 1-800-MY-APPLE Copyright © 2004 Apple Computer, Inc. All rights reserved. | Terms of use | Privacy Notice