Inside Macintosh: Apple Game Sprockets Guide /

Chapter 2 - DrawSprocket / DrawSprocket Reference

DrawSprocket Functions / Handling a Mouse

DSpContext_GlobalToLocal

Use the DSpContext_GlobalToLocal function to translate a point in global coordinates into local coordinates for a context.

OSStatus DSpContext_GlobalToLocal (
DSpContextReference inContext,
Point *ioPoint);

inContext

A reference to the context whose local coordinates you want to translate into.

ioPoint

Takes a point in global coordinates. On exit, contains the point in local coordinates.

function result

A result code.

DESCRIPTION

You pass the DSpContext_GlobalToLocal function a point in global coordinates in the ioPoint parameter and the context in which the point is located in the inContext parameter. The function returns, in the ioPoint parameter, the point in the context's local coordinates.

CALLING RESTRICTIONS

Do not call this function during an interrupt.