Author
I hope this is the right place to ask this question. I posted this a long time ago and din''t get a satisfactory answer and i left the subject for awhile. Now i''m after getting back around to it and i could do with a hint or two. I''m doing a simple implementation of a flight sim and i need help doing the panel of the aeroplane. I figured i could use a static background and then for the "needles", have another image which i could rotate as i wish. My question is, how do i rotate the image and also how would i get the image to appear in the correct position?????
Thanks in advance for any help
Use those 2 functions:
void Enter2DMode()
{
glPushAttrib(GL_LIGHTING_BIT|GL_DEPTH_BUFFER_BIT);
glDisable(GL_LIGHTING);
glDisable(GL_DEPTH_TEST);
//glEnable(GL_BLEND);
//glBlendFunc(GL_DST_ALPHA,GL_SRC_ALPHA);
glViewport(0, 0, window_width, window_height);
glMatrixMode(GL_PROJECTION);
glPushMatrix();
glLoadIdentity();
glOrtho(0.0, (GLdouble)window_width, (GLdouble)window_height, 0.0, -250.0, 250.0);
glMatrixMode(GL_MODELVIEW);
glPushMatrix();
glLoadIdentity();
}
void Leave2DMode()
{
//glDisable(GL_BLEND);
glMatrixMode(GL_MODELVIEW);
glPopMatrix();
glMatrixMode(GL_PROJECTION);
glPopMatrix();
glMatrixMode(GL_MODELVIEW);
glPopAttrib();
}
Then draw the instruments, push the modelview matrix, rotate, etc. your needles, then pop the matrix
Height Map Editor | Eternal lands
void Enter2DMode()
{
glPushAttrib(GL_LIGHTING_BIT|GL_DEPTH_BUFFER_BIT);
glDisable(GL_LIGHTING);
glDisable(GL_DEPTH_TEST);
//glEnable(GL_BLEND);
//glBlendFunc(GL_DST_ALPHA,GL_SRC_ALPHA);
glViewport(0, 0, window_width, window_height);
glMatrixMode(GL_PROJECTION);
glPushMatrix();
glLoadIdentity();
glOrtho(0.0, (GLdouble)window_width, (GLdouble)window_height, 0.0, -250.0, 250.0);
glMatrixMode(GL_MODELVIEW);
glPushMatrix();
glLoadIdentity();
}
void Leave2DMode()
{
//glDisable(GL_BLEND);
glMatrixMode(GL_MODELVIEW);
glPopMatrix();
glMatrixMode(GL_PROJECTION);
glPopMatrix();
glMatrixMode(GL_MODELVIEW);
glPopAttrib();
}
Then draw the instruments, push the modelview matrix, rotate, etc. your needles, then pop the matrix
Height Map Editor | Eternal lands
Author
Thanks for your post but it doesn't answer my question exactly, i need to know how to rotate the image and get it in the right place. Thanx anyway
I think they could be some confusion over my problem. I mean to create a texture from the needle image, bind it to a quad which will be made transparent so that it don't obsecure the background. It is THE QUAD i mean to rotate. I think you thought that i was trying to rotate the image in some way???? Sorry for the confusion.
So my question is:
1. How do i rotate the image in accordance with the speed for example?
2. How do i get it in the right place on the screen?
And also, is this a good or bad or rubbish way of doing a guage? How are guages implemented in simulators or games?? Mayb i can do a simplfied version of it??
[edited by - I_Pee_Freely on January 23, 2003 10:35:44 AM]
I think they could be some confusion over my problem. I mean to create a texture from the needle image, bind it to a quad which will be made transparent so that it don't obsecure the background. It is THE QUAD i mean to rotate. I think you thought that i was trying to rotate the image in some way???? Sorry for the confusion.
So my question is:
1. How do i rotate the image in accordance with the speed for example?
2. How do i get it in the right place on the screen?
And also, is this a good or bad or rubbish way of doing a guage? How are guages implemented in simulators or games?? Mayb i can do a simplfied version of it??
[edited by - I_Pee_Freely on January 23, 2003 10:35:44 AM]
No, he was correct. Push model view matrix, rotate/translate your need into postion, then pop the model view matrix, and repeat until all needles are done.
try this...
1. Load a texture with the needle. the background should be transparent. (ie. black background, yellow needle)
2.use Raduprv''s code to enter ortho mode, then...
3.use glBlendFunc(GL_SRC_ALPHA, GL_ONE) & enable (GL_BLEND)
4.go into texture matrix, push matrix
glMatrixMode(GL_TEXTURE);
glPushMatrix();
5. rotate the needle (glRotated(20,0,0) or whatever)
6. DRAW it as a quad, or whatever.
7. pop the matrix
8. leave ortho mode.
1. Load a texture with the needle. the background should be transparent. (ie. black background, yellow needle)
2.use Raduprv''s code to enter ortho mode, then...
3.use glBlendFunc(GL_SRC_ALPHA, GL_ONE) & enable (GL_BLEND)
4.go into texture matrix, push matrix
glMatrixMode(GL_TEXTURE);
glPushMatrix();
5. rotate the needle (glRotated(20,0,0) or whatever)
6. DRAW it as a quad, or whatever.
7. pop the matrix
8. leave ortho mode.
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