Legacy Document

Important: The information in this document is obsolete and should not be used for new development.

Inside Macintosh: QuickDraw GX Environment and Utilities /

Chapter 8 - QuickDraw GX Mathematics / QuickDraw GX Mathematics Reference

Mathematical Functions / Fixed-Point Operations

Magnitude
You can use the Magnitude function to obtain the magnitude of a vector, the length of a line, or the distance between two points.
unsigned long Magnitude (long deltaX, long deltaY);
deltaX
The difference in the x-coordinates of the vector's end points.
deltaY
The difference in the y-coordinates of the vector's end points.

function result
The magnitude of the vector.

DESCRIPTION
The Magnitude function returns (deltaX2 + deltaY2)1/2, the Euclidean distance between two points whose x-coordinates are separated by deltaX and whose y-coordinates are separated by deltaY.
The fixed-point format of the result is the same as the fixed-point format for both of the parameters. Make sure that the two parameters use the same format.