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From: crunch@well.UUCP (John Draper)
Newsgroups: net.micro.amiga
Subject: Intuition strangeness
Message-ID: <1181@well.UUCP>
Date: Fri, 30-May-86 08:53:53 EDT
Article-I.D.: well.1181
Posted: Fri May 30 08:53:53 1986
Date-Received: Sun, 1-Jun-86 06:55:02 EDT
Reply-To: crunch@well.UUCP (John Draper)
Organization: Whole Earth Lectronic Link, Sausalito CA
Lines: 62



  I am trying to write a "mouse handler" to draw a rectangle on the
screen,   by pointing to an area,  pressing a button,   and while
holding the button down,  "Drawing out" the rectangle.   Lets assume
that "  \" is the mouse pointer,   when I press at "A",   I pull the
mouse down and to the right and want to end up at "B" with a rectangle
drawn as shown below:
   
      A
       ---------------
       |             |
       |             |
       |             |
       ---------------
                     B\   <-- The "slash" is the mouse pointer.


  However,  what I am getting is rather wierd.   It appears that Intuition
is passing back incorrect Delta X and Y's  I an using DELTAMOVE flag set.
The cursor does not seem to track the mouse.    Instead,   I am getting
the following:

     A
      ---------------
      |             |
      |      \      |
      |             |
      ---------------
                    B

  Note the "\" in the middle of the square?  It appears as I move the 
mouse button slowly to the right,  the box grows TWICE as fast,  the
mouse cursor being exactly in the center of the box.   The following
code is done everytime Intuition passes a MOUSEMOVE event message.
I come into this with "x" and "y" being the values in the IntuiMessage
structure,   As I have mentioned before,  the DELTAMOVE flag is set in
the IDCMPFlags.

-----------------------------------------------------
    if (rt_button) {              /* $$$ */
       if (erase) {
          draw_box(rp, OLeft, OTop, OWidth, OHeight);     /* Erase old */
       }
       Width += x;
       if (!siz_flag) Left += x;
 
       Height += y;
       if (!siz_flag) Top += y;
 
       draw_box(rp, Left, Top, Width, Height);
       OLeft = Left;   OTop = Top;
       OWidth = Width; OHeight = Height;
       erase = TRUE;
    }
--------------------------------------------------------------------
   Is the delta X and Y values getting passed from intuition so far off
from the mouse arrow pointer??   


Please help!!!  - It is really hanging me up in releasing the Gadget
editor.