void glFillRect(RECTANGLE* rc, ColourData* colour)
{
glLoadIdentity();
glTranslated(rc->x,rc->y,0);
glColor4d(colour->r,colour->g,colour->b,colour->a);
glBegin(GL_QUADS);
glVertex2d(0,0);
glVertex2d(rc->w,0);
glVertex2d(rc->w,rc->y);
glVertex2d(rc->w,0);
glEnd();
}Filling a rectangle
Author
Your second and fourth vertices are the same. That's probably your problem.
It probably should've been
glVertex2d(0, rc->y);
It probably should've been
glVertex2d(0, rc->y);
Author
*blinks*
...
*smacks head*
Right. I don't know how I missed that :(
Thanks :)
EDIT:
Erm.. even with the changes, it still doesn't work. I'm drawing it last, so it's not behind anything, with this code:
ColourData colour = {255,255,100,255};
RECTANGLE rc = {50,50,10,10};
glFillRect(&rc,&colour);
...
*smacks head*
Right. I don't know how I missed that :(
Thanks :)
EDIT:
Erm.. even with the changes, it still doesn't work. I'm drawing it last, so it's not behind anything, with this code:
ColourData colour = {255,255,100,255};
RECTANGLE rc = {50,50,10,10};
glFillRect(&rc,&colour);
Try reversing the order of the vertices so that they are like this:
glVertex2d(0,0);
glVertex2d(0,rc->y);
glVertex2d(rc->w,rc->y);
glVertex2d(rc->w,0);
Polygons should be drawn in a counter-clockwise vertex order.
Then again, it could be a number of other things. Are you able to draw anything else to the screen?
glVertex2d(0,0);
glVertex2d(0,rc->y);
glVertex2d(rc->w,rc->y);
glVertex2d(rc->w,0);
Polygons should be drawn in a counter-clockwise vertex order.
Then again, it could be a number of other things. Are you able to draw anything else to the screen?
Author
I tried to reverse it, but no luck.
And yes, I can draw quads with textures mapped onto them using this code:
And yes, I can draw quads with textures mapped onto them using this code:
void DrawImage(ImageData* structure, double x, double y, double rotation, ColourData* colour){ glBindTexture( GL_TEXTURE_2D, structure->textureid ); glLoadIdentity(); glTranslated(x+structure->w/2,y+structure->h/2,0); glRotated(rotation,0,0,1); glColor4ub(colour->r,colour->g,colour->b,colour->a); glBegin(GL_QUADS); glTexCoord2f (0.0f, 0.0f); glVertex2d(0-structure->w/2,0-structure->h/2); glTexCoord2f (1.0f, 0.0f); glVertex2d(0+structure->w/2,0-structure->h/2); glTexCoord2f (1.0f, 1.0f); glVertex2d(0+structure->w/2,0+structure->h/2); glTexCoord2f (0.0f, 1.0f); glVertex2d(0-structure->w/2,0+structure->h/2); glEnd();}
Try calling glDisable(GL_TEXTURE_2D) before drawing your quad. If texturing is on, it is possible to get strange results without using texture coordinates and such.
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