gamedevlists-windows

[GD-Windows] Mouse position

[Diogo de A. <dio...@ne...>]

Hey all.
 
I'm having a small problem getting the coordinate of the mouse in the
window. My current system gets the coordinate like this:
 
POINT pt;
GetCursorPos(&pt);
 
Then I want to transform this coordinate (in absolute screen
coordinates, as I see it) to my engine's coordinates (which has logical
coordinates, to account for different resolutions, bitmap scaling,
etc)... 
I get the window rectangle (also in screen coordinates):
 
RECT rect;
GetWindowRect(m_window,&rect);
 
Finally, I do the conversion itself
 
float sx=rect.right-rect.left;
float sy=rect.bottom-rect.top;
 
float relative_x=virtual_res_x*(pt.x-rect.left)/sx;
float relative_y=virtual_res_y*(pt.y-rect.top)/sy;
 
This works almost perfectly, except when I approach the cursor from the
top of the window... The window has the standard bar (created with
WS_OVERLAPPED | WS_CAPTION | WS_SYSMENU | WS_THICKFRAME | WS_MINIMIZEBOX
| WS_MAXIMIZEBOX | WS_VISIBLE | WS_POPUPWINDOW), and apparently
GetWindowRect gets the whole window, including the top bar, instead of
getting only the "drawable" part of it... I imagine the problem is that
m_window above is a parent window with 2 children (the system bar, and
the drawable part), but I can't find how to get just the drawable
rectangle to do the conversion... This works fine if I create the window
without border of title/system bar... So, my question is: how do I get
the drawable part of the window's rectangle?
 
Thanks in advance!
 
Diogo de Andrade
Creative & Technical Director
Spellcaster Studios
dio...@sp...
www.spellcasterstudios.com
 
 
 
 

Re: [GD-Windows] Mouse position

[Jason M. <ja...@s2...>]

Check out GetClientRect() and AdjustWindowRect as well, those should=20
give you all the info you need.

Here is how we get the mouse position in our game:

CRecti CSystem::GetWindowArea()
{
RECT full, client;
int clientw, clienth;
int style;

if (Vid.IsFullScreen())
style =3D WS_POPUP | WS_MAXIMIZE;
else
style =3D WS_CAPTION | WS_MINIMIZEBOX | WS_VISIBLE;

GetClientRect((HWND)m_WindowHandle, &client);
clientw =3D client.right;
clienth =3D client.bottom;
AdjustWindowRect(&client, style, false);
GetWindowRect((HWND)m_WindowHandle, &full);

return CRecti(full.left - client.left,
full.top - client.top,
full.left - client.left + clientw,
full.top - client.top + clienth);
}


CVec2i CSystem::GetMousePos()
{
CRecti winrec =3D GetWindowArea();
POINT p;
::GetCursorPos(&p);
return CVec2i(p.x - winrec.left, p.y - winrec.top);
}


Diogo de Andrade wrote:

> Hey all=85
>
> I=92m having a small problem getting the coordinate of the mouse in the=
=20
> window=85 My current system gets the coordinate like this:
>
> POINT pt;
>
> GetCursorPos(&pt);
>
> Then I want to transform this coordinate (in absolute screen=20
> coordinates, as I see it) to my engine's coordinates (which has=20
> logical coordinates, to account for different resolutions, bitmap=20
> scaling, etc)...
>
> I get the window rectangle (also in screen coordinates):
>
> RECT rect;
>
> GetWindowRect(m_window,&rect);
>
> Finally, I do the conversion itself
>
> float sx=3Drect.right-rect.left;
>
> float sy=3Drect.bottom-rect.top;
>
> float relative_x=3Dvirtual_res_x*(pt.x-rect.left)/sx;
>
> float relative_y=3Dvirtual_res_y*(pt.y-rect.top)/sy;
>
> This works almost perfectly, except when I approach the cursor from=20
> the top of the window... The window has the standard bar (created with=20
> WS_OVERLAPPED | WS_CAPTION | WS_SYSMENU | WS_THICKFRAME |=20
> WS_MINIMIZEBOX | WS_MAXIMIZEBOX | WS_VISIBLE | WS_POPUPWINDOW), and=20
> apparently GetWindowRect gets the whole window, including the top bar,=20
> instead of getting only the "drawable" part of it... I imagine the=20
> problem is that m_window above is a parent window with 2 children (the=20
> system bar, and the drawable part), but I can't find how to get just=20
> the drawable rectangle to do the conversion... This works fine if I=20
> create the window without border of title/system bar... So, my=20
> question is: how do I get the drawable part of the window's rectangle?
>
> Thanks in advance!
>
> Diogo de Andrade
>
> Creative & Technical Director
>
> Spellcaster Studios
>
> dio...@sp...
>
> www.spellcasterstudios.com
>

Re: [GD-Windows] Mouse position

[Alen L. <ale...@cr...>]

I believe that ScreenToClient() is the simplest solution for that.

Alen

----- Original Message -----=20
From: "Jason Morales" <ja...@s2...>
To: <gam...@li...>
Sent: Tuesday, October 18, 2005 2:12 PM
Subject: Re: [GD-Windows] Mouse position


Check out GetClientRect() and AdjustWindowRect as well, those should
give you all the info you need.

Here is how we get the mouse position in our game:

CRecti CSystem::GetWindowArea()
{
RECT full, client;
int clientw, clienth;
int style;

if (Vid.IsFullScreen())
style =3D WS_POPUP | WS_MAXIMIZE;
else
style =3D WS_CAPTION | WS_MINIMIZEBOX | WS_VISIBLE;

GetClientRect((HWND)m_WindowHandle, &client);
clientw =3D client.right;
clienth =3D client.bottom;
AdjustWindowRect(&client, style, false);
GetWindowRect((HWND)m_WindowHandle, &full);

return CRecti(full.left - client.left,
full.top - client.top,
full.left - client.left + clientw,
full.top - client.top + clienth);
}


CVec2i CSystem::GetMousePos()
{
CRecti winrec =3D GetWindowArea();
POINT p;
::GetCursorPos(&p);
return CVec2i(p.x - winrec.left, p.y - winrec.top);
}


Diogo de Andrade wrote:

> Hey all=85
>
> I=92m having a small problem getting the coordinate of the mouse in the=
=20
> window=85 My current system gets the coordinate like this:
>
> POINT pt;
>
> GetCursorPos(&pt);
>
> Then I want to transform this coordinate (in absolute screen coordinate=
s,=20
> as I see it) to my engine's coordinates (which has logical coordinates,=
 to=20
> account for different resolutions, bitmap scaling, etc)...
>
> I get the window rectangle (also in screen coordinates):
>
> RECT rect;
>
> GetWindowRect(m_window,&rect);
>
> Finally, I do the conversion itself
>
> float sx=3Drect.right-rect.left;
>
> float sy=3Drect.bottom-rect.top;
>
> float relative_x=3Dvirtual_res_x*(pt.x-rect.left)/sx;
>
> float relative_y=3Dvirtual_res_y*(pt.y-rect.top)/sy;
>
> This works almost perfectly, except when I approach the cursor from the=
=20
> top of the window... The window has the standard bar (created with=20
> WS_OVERLAPPED | WS_CAPTION | WS_SYSMENU | WS_THICKFRAME | WS_MINIMIZEBO=
X |=20
> WS_MAXIMIZEBOX | WS_VISIBLE | WS_POPUPWINDOW), and apparently=20
> GetWindowRect gets the whole window, including the top bar, instead of=20
> getting only the "drawable" part of it... I imagine the problem is that=
=20
> m_window above is a parent window with 2 children (the system bar, and =
the=20
> drawable part), but I can't find how to get just the drawable rectangle=
 to=20
> do the conversion... This works fine if I create the window without bor=
der=20
> of title/system bar... So, my question is: how do I get the drawable pa=
rt=20
> of the window's rectangle?
>
> Thanks in advance!
>
> Diogo de Andrade
>
> Creative & Technical Director
>
> Spellcaster Studios
>
> dio...@sp...
>
> www.spellcasterstudios.com
>



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