Path: utzoo!attcan!uunet!samsung!usc!apple!well!gurgle
From: gurgle@well.sf.ca.us (Pete Gontier)
Newsgroups: comp.sys.mac.programmer
Subject: Re: How can I move the cursor with THINKC??
Message-ID: <21383@well.sf.ca.us>
Date: 27 Oct 90 00:55:51 GMT
References: <55432.2723256d@pttrnl.nl>
Organization: cellular
Lines: 43

In article <55432.2723256d@pttrnl.nl> nugteren@pttrnl.nl writes:
>I am writing a trackball driver that would allow connection of an MSDOS Mouse
>(actually optical trackball) to a Mac II. One of the problems I have to solve
>is how to change to cursor position on the screen from a software level.
>


This is what I have used in the past (yesterday, in fact).

Matt's code is probably just as functional, but I guessed that if you're
doing a hardware interface, you don't want an explicit call to Delay
for 5 ticks (and might not have access to it). I believe that the line
which puts a value into the variable LongMouse does basically what the
delay for 5 ticks does.

 --- cut here ---

typedef enum { eCoupled = -1, eUncoupled = 0 } tMouseCouple;

extern Point MTemp                : 0x0828;
extern Point Mouse                : 0x0830;
extern long LongMouse             : 0x0830;
extern tMouseCouple CrsrCouple    : 0x08CF;
extern Point RawMouse             : 0x082C;
extern Boolean CrsrNew            : 0x08CE;
extern Boolean CrsrBusy           : 0x08CD;

/*******************************************/

void SetMouse ( Point p ) {
  long pinnedPt = PinRect ( & CrsrPin, p );
  CrsrBusy = true;            /* I'm fucking the mouse; hands off */
  CrsrCouple = eUncoupled;    /* switch off coupling */
  MTemp = p;                  /* hack interrupt-level mouse coords */
  RawMouse = p;               /* hack "unjerked" mouse coords */
  LongMouse = pinnedPt;       /* hack "high-level" mouse coords */
  CrsrNew = true;             /* hey, mouse VBL, DO IT */
  CrsrCouple = eCoupled;      /* switch on coupling */
  CrsrBusy = false;           /* OK, all done */
}
-- 
 Pete Gontier, gurgle@well.sf.ca.us
 Software Imagineer, Kiwi Software, Inc.