From: Manuel Collado <m.collado@domain.ivalid>
Subject: Re: How to get the mouse position with JEWL?
Date: Thu, 21 Oct 2010 00:22:56 +0200
Date: 2010-10-21T00:22:56+02:00 [thread overview]
Message-ID: <i9nq7p$75o$1@peque.uv.es> (raw)
In-Reply-To: <057188e8-a7c9-4aeb-968c-ccdf720bd0fc@t20g2000yqa.googlegroups.com>
El 20/10/2010 19:20, tolkamp escribi�:
> On 20 okt, 13:42, Manuel Collado<m.coll...@domain.invalid> wrote:
>> El 20/10/2010 11:04, tolkamp escribi�:
>>
>>> I use JEWL in several of my applications.
>>> Now I try to get the mouse position within a JEWL canvas by using the
>>> function "End_Point(Canavas)".
>>> The resulting mouse position (x,y) is always zero. What is going wrong?
>>
>> Please try:
>>
>> point := Start_Point( canvas );
>>
>> It works for me.
>>
>
> Also when I try:
> point := Start_Point( canvas );
> the x and y position remains zero.
>
> Here is the code:
>
> task body Task_2Hz is
> My_Frame : Frame_Type;
> My_Canvas : Canvas_Type;
> My_Mouse_Position : Point_Type;
> begin
> accept Start do
> My_Frame := Frame (1200, 500, "", 0);
> My_Canvas := Canvas (Frame, (850,10), 300, 300);
> loop
> My_Mouse_Position := Start_Point(My_Canvas);
> Put("Mouse-x = "); Int_Io.Put(My_Mouse_Position.x); New_Line;
> Put("Mouse-y = "); Int_Io.Put(My_Mouse_Position.y); New_Line;
> delay 0.5;
> end loop;
> end Task_2Hz;
IIRC, you must wait for a mouse event before reading the coordinates.
Here is a code fragment of a real program that uses a canvas. You may
figure how to adapt it to your needs:
function Get_Point return Point_Type is
Here: Point_Type;
begin
loop
case Next_Command is
when Cmd_Mouse =>
exit;
when Cmd_Quit =>
raise Program_Aborted;
when others =>
null;
end case;
end loop;
Here := Start_Point( Main_Canvas );
return Logical( Here );
end Get_Point;
Hope it helps.
--
Manuel Collado - http://lml.ls.fi.upm.es/~mcollado
next prev parent reply other threads:[~2010-10-20 22:22 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-10-20 9:04 How to get the mouse position with JEWL? tolkamp
2010-10-20 11:42 ` Manuel Collado
2010-10-20 17:20 ` tolkamp
2010-10-20 22:22 ` Manuel Collado [this message]
2010-10-20 22:51 ` tmoran
2010-10-21 2:59 ` Jeffrey Carter
2010-10-21 4:08 ` tmoran
2010-10-21 7:31 ` Dmitry A. Kazakov
2010-10-21 19:10 ` tmoran
2010-10-21 19:38 ` Dmitry A. Kazakov
2010-10-22 0:39 ` tmoran
2010-10-22 7:35 ` Dmitry A. Kazakov
2010-10-22 10:10 ` Frank J. Lhota
2010-10-21 15:23 ` tolkamp
2010-10-21 16:47 ` Georg Bauhaus
2010-10-21 17:09 ` tolkamp
2010-10-21 17:24 ` Niklas Holsti
2010-10-21 20:34 ` tolkamp
2010-10-22 13:55 ` tolkamp
2010-10-22 22:15 ` Manuel Collado
2010-10-23 15:26 ` tolkamp
2010-10-21 21:50 ` Manuel Collado
2010-10-22 10:40 ` tolkamp
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