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Today's Topics:

1. Re: Developing FLTK applications in Eclipse-LINUX (Dejan Lekic)
2. Re: Re: How to draw ???fixed??? text in OpenGL windows (Simon)
3. Re: Re: How to draw ???fixed??? text in OpenGL windows (Shai Ayal)
4. Re: Re: [fltk.opengl] Re: How to draw ???fixed??? text in
OpenGL windows (Linda)
5. Re: Re: [fltk.opengl] Re: How to draw ???fixed??? text in
OpenGL windows (Shai Ayal)


----------------------------------------------------------------------

Message: 1
Date: Thu, 02 Mar 2006 12:37:49 -0500
From: Dejan Lekic
Subject: Re: [fltk.opengl] Developing FLTK applications in
Eclipse-LINUX
To: fltk-opengl-B9D8k9nSxTHQT0dZR+AlfA@public.gmane.org
Message-ID: <929-fltk .opengl-+FT6Wyec2gCDR8wcTNDzOQ@public.gmane.org>
Content-Type: text/plain; charset=us-ascii

I must admit I do not understand Your mail... My tutorial is actually
covering Eclipse on Linux, and it is pretty much straightforward. Do you
actually need some guidence with FLUID?

--
...........
Dejan Lekic
http://dejan.lekic.org



------------------------------

Message: 2
Date: Thu, 02 Mar 2006 18:42:01 +0100
From: Simon
Subject: Re: [fltk.opengl] Re: How to draw ???fixed??? text in OpenGL
windows
To: "Mirror of fltk.opengl Newsgroup"
Message-ID:
Content-Type: text/plain; format=flowed; delsp=yes; charset=iso-8859-1

simply switch to 2d drawing mode before drawing the text and then switch
back to 3d afterwards

On Thu, 02 Mar 2006 09:38:25 +0100, Linda
wrote:

> I searched the previous articles i n the forum. Now I understant why the
> text is transformed just like an object. My question still remains. How
> to draw the text specified in screen coordinates? Thanks for all helps.
>
> With best wishes,
>
> Linda
> _______________________________________________
> fltk-opengl mailing list
> fltk-opengl-B9D8k9nSxTHQT0dZR+AlfA@public.gmane.org
> http://lists.easysw.com/mailman/listinfo/fltk-opengl
>



--
Using Opera's revolutionary e-mail client: http://www.opera.com/m2/



------------------------------

Message: 3
Date: Thu, 2 Mar 2006 18:58:29 +0200
From: "Shai Ayal"
Subject: Re: [fltk.opengl] Re: How to draw ???fixed??? text in OpenGL
windows
To: "Mirror of fltk.opengl Newsgroup"
Message-ID:
<420fb9e60603020858u529e64eblc4b224c064c1dd4b-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
Content-Type: text/plain; charset=ISO-8859-1

Well,

either display the text before you do the transformations, or
calculate the transformed coords corrsponding to the screen coords you
want. for the, have a look at the gluUnProject function

Shai

On 3/2/06, Linda wrote:
> I searched the previous articles in the forum. Now I understant why the text is transformed just like an object. My question still remains. How to draw the text specified in screen coordinates? Thanks for all helps.
>
> With best wishes,
>
> Linda
> _______________________________________________
> fltk-opengl mailing list
> fltk-opengl-B9D8k9nSxTHQT0dZR+AlfA@public.gmane.org
> http://lists.easysw.com/mailman/listinfo/fltk-opengl
>



------------------------------

Message: 4
Date: Thu, 02 Mar 2006 22:24:41 -0500
From: Linda
Subject: Re: Re: [fltk.opengl] Re: How to draw ???fixed??? text in
OpenGL windows
To: fltk-opengl@ea sysw.com
Message-ID: <932-fltk.opengl-+FT6Wyec2gCDR8wcTNDzOQ@public.gmane.org>

Thank you Shai for your advice. Below is my code. I unproject the screen coordinates to the world coordinates.

// x, y, z, and w=1 are object coordinates for the raster position
void AnimationOpenGLwindow::drawText(const char* str, GLfloat x, GLfloat y, GLfloat z)
{
glRasterPos3f(x, y, z);
gl_draw(str, strlen(str));
}


// x and y are screen coordinates
void AnimationOpenGLwindow::drawText_screen(const char* str, int x, int y)
{
GLdouble modelviewMatrix[16], projMatrix[16];
GLint viewport[4];
GLdouble winx = x, winy = y, winz = 0.001; // unproject to the near plane winz = 0.0
GLdouble objx, objy, objz;

glGetDoublev(GL_MODELVIEW_MATRIX, modelviewMatrix);
glGetDoublev(GL_PROJECTION_MATRIX, projMatrix);
glGetIntegerv(GL_VIEWPORT, viewport);

gluUnProject(winx, winy, winz, modelviewMatrix, projMatrix, viewport, &objx, &objy, &objz);

drawText(str, objx, objy, objz);
}


I wonder if there is a more effinceint way to do the work.


Regards,

Linda



> Well,
>
> either display the text before you do the transformations, or
> calculate the transformed coords corrsponding to the screen coords you
> want. for the, have a look at the gluUnProject function
>
> Shai
>
> On 3/2/06, Linda wrote:
> > I searched the previous articles in the forum. Now I understant why the t=
> ext is transformed just like an object. My question still remains. How to d=
> raw the text specified in screen coordinates? Thanks for all helps.
> >
> > With best wishes,
> >
> > Linda
> > _______________________________________________
> > fltk-opengl mailing list
> > fltk-opengl-B9D8k9nSxTHQT0dZR+AlfA@public.gmane.org
> > http://lists.easysw.com/mailman/listinf o/fltk-opengl
> >
>



------------------------------

Message: 5
Date: Fri, 3 Mar 2006 12:33:42 +0200
From: "Shai Ayal"
Subject: Re: Re: [fltk.opengl] Re: How to draw ???fixed??? text in
OpenGL windows
To: "Mirror of fltk.opengl Newsgroup"
Message-ID:
<420fb9e60603030233h54097c2bqee35695a157cc54d-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
Content-Type: text/plain; charset=ISO-8859-1

You can do it more efficiently if you use some prior knowledge on how
simple your projections are. gluUnproject works for the general case.
However lets say all your transformations were translations only, than
it would be easy for you to "untranslate" the coordinates without
calling gluUnproject at all and saving a lot of matrix math.

Shai


On 3/3/06, Linda wrote:
> Thank you Shai for your advice. Below is my code. I unproject the screen coordinates to the world coordinates.
>
> // x, y, z, and w=1 are object coordinates for the raster position
> void AnimationOpenGLwindow::drawText(const char* str, GLfloat x, GLfloat y, GLfloat z)
> {
> glRasterPos3f(x, y, z);
> gl_draw(str, strlen(str));
> }
>
>
> // x and y are screen coordinates
> void AnimationOpenGLwindow::drawText_screen(const char* str, int x, int y)
> {
> GLdouble modelviewMatrix[16], projMatrix[16];
> GLint viewport[4];
> GLdouble winx = x, winy = y, winz = 0.001; // unproject to the near plane winz = 0.0
> GLdouble objx, objy, objz;
>
> glGetDoublev(GL_MODELVIEW_MATRIX, modelviewMatrix);
> glGetDoublev(GL_PROJECTION_MATRIX, projMatrix);
> glGetIntegerv(GL_VIEWPORT, viewport);
>
> gluUnProject(winx, winy, winz, modelviewMatrix, projMatrix, viewport, &objx, &objy, &objz);
>
> drawText(str, objx, objy, objz);
> }
>
>
> I wonder if there is a more effinceint way to do the work.
>
>
> Regards,
>
> Linda
>
>
>
> > Well,
> >
> > either display the text before you do the transformations, or
> > calculate the transformed coords corrsponding to the screen coords you
> > want. for the, have a look at the gluUnProject function
> >
> > Shai
> >
> > On 3/2/06, Linda wrote:
> > > I searched the previous articles in the forum. Now I understant why the t=
> > ext is transformed just like an object. My question still remains. How to d=
> > raw the text specified in screen coordinates? Thanks for all helps.
> > >
> > > With best wishes,
> > >
> > > Linda
> > > _______________________________________________
> > > fltk-opengl mailing list
> > > fltk-opengl-B9D8k9nSxTHQT0dZR+AlfA@public.gmane.org
> > > http://lists.easysw.com/mailman/listinfo/fltk-opengl
> > >
> >
>
> _______________________________________________
> fltk-opengl mailing list
> fltk-opengl-B9D8k9nSxTHQT0dZR+AlfA@public.gmane.org
> http://lists.easysw.com/mailman/listinfo/fltk-opengl
>



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End of fltk-opengl Digest, Vol 26, Issue 3
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