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From: mks@cbmvax.commodore.com (Michael Sinz)
Newsgroups: comp.sys.amiga.programmer
Subject: Re: How to do a "MovePointer()"?
Message-ID: <22533@cbmvax.commodore.com>
Date: 18 Jun 91 12:49:02 GMT
References: <19997@csli.Stanford.EDU>
Reply-To: mks@cbmvax.commodore.com (Michael Sinz)
Organization: Commodore, West Chester, PA
Lines: 105

In article <19997@csli.Stanford.EDU> bratt@csli.Stanford.EDU (Harry Bratt) writes:
>I need to change the position of Intuition's mouse pointer.  I
>don't need lots of low-level control (like recording mouse movements
>and playing them back), I just need a single re-positioning once
>in a while.
>Currently I'm doing:
>
>IntuitionBase->MouseX = x;
>IntuitionBase->MouseY = y;
>SetPointer(...);
>
>This appears to work....  but...
>Is it legal to be writing to those IntuitionBase variables?  And
>is there a better way to be doing this?

You are lucky that it almost worked...

To move the mouse, you need to send a mouse event down the input
food chain.  There is full documentation of this in the RKM (1.3)

The example code given here moves the mouse pointer in a circle...

/*
 * InputDevice example
 *
 * This example adds a few mouse movements to the input chain...
 */

#include <exec/types.h>
#include <exec/memory.h>
#include <devices/input.h>
#include <devices/inputevent.h>

#include <proto/all.h>

VOID main(VOID)
{
struct IOStdReq   *inputReqBlk;
struct MsgPort    *inputPort;
struct InputEvent *FakeEvent;
       short      loop;
       short      num;
       short      numloop;

    if (inputPort=CreatePort(NULL,NULL))
    {
        if (FakeEvent=AllocMem(sizeof(struct InputEvent),MEMF_PUBLIC))
        {
            if (inputReqBlk=(struct IOStdReq *)CreateExtIO(inputPort,
                                                     sizeof(struct IOStdReq)))
            {
                if (!OpenDevice("input.device",NULL,
                                 (struct IORequest *)inputReqBlk,NULL))
                {
                    for (numloop=0;numloop<4;numloop++)
                     for (loop=0;loop<8;loop++)
                      for (num=0;num<20;num++)
                    {
			/*
			 * Note that events are trashed after they finish
			 * from the input food chain.  All fields must
			 * be set up before submitting the event again
			 */
                        FakeEvent->ie_NextEvent=NULL;
                        FakeEvent->ie_Class=IECLASS_RAWMOUSE;
                        FakeEvent->ie_Code=IECODE_NOBUTTON;
                        FakeEvent->ie_Qualifier=IEQUALIFIER_RELATIVEMOUSE;
                        FakeEvent->ie_X=0;
                        FakeEvent->ie_Y=0;

                        switch (loop)
                        {
                        case 0: FakeEvent->ie_X=1;
                        case 1: FakeEvent->ie_Y=1;  break;
                        case 2: FakeEvent->ie_Y=1;
                        case 3: FakeEvent->ie_X=-1; break;
                        case 4: FakeEvent->ie_X=-1;
                        case 5: FakeEvent->ie_Y=-1; break;
                        case 6: FakeEvent->ie_Y=-1;
                        case 7: FakeEvent->ie_X=1;  break;
                        }

                        inputReqBlk->io_Data=(APTR)FakeEvent;
                        inputReqBlk->io_Command=IND_WRITEEVENT;
                        inputReqBlk->io_Flags=0;
                        inputReqBlk->io_Length=sizeof(struct InputEvent);
                        DoIO((struct IORequest *)inputReqBlk);
                    }
                    CloseDevice((struct IORequest *)inputReqBlk);
                }
                DeleteExtIO((struct IORequest *)inputReqBlk);
            }
            FreeMem(FakeEvent,sizeof(struct InputEvent));
        }
        DeletePort(inputPort);
    }
}

/----------------------------------------------------------------------\
|      /// Michael Sinz  -  Amiga Software Engineer                    |
|     ///                   Operating System Development Group         |
|    ///   BIX:  msinz      UUNET:  rutgers!cbmvax!mks                 |
|\\\///                                                                |
| \XX/     Quantum Physics:  The Dreams that Stuff is made of.         |
\----------------------------------------------------------------------/