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How can I make this thing not move when I redisplay it?

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Started by thyrgle March 12, 2011 09:46 PM

2 comments, last by thyrgle 13 years, 1 month ago

thyrgle

116

Author

March 12, 2011 09:46 PM

I need to redisplay my OpenGL draw function which is as follows:



void drawMolecule() {

	glMatrixMode (GL_PROJECTION);

	glLoadIdentity();

	glOrtho (0, 400, 400, 0, 0, 1);

	glMatrixMode (GL_MODELVIEW);



	glClearColor(0.0, 0.0, 0.0, 0.0);

	glClear(GL_COLOR_BUFFER_BIT);

	for (int i = 0; i < 100; i++)

	{

		getColor(grid);

		getTransform(grid);

		glBegin(GL_QUADS);

			glVertex2i(0, 0);

			glVertex2i(20, 0);

			glVertex2i(20, 20);

			glVertex2i(0, 20);

		glEnd();

	}

	glutSwapBuffers();

}

But, when I do so, everything gets shifted down when I call glutPostRedisplay in another function... How can I stop it from shifting down? I am calling the translations in the getTransform function which is defined as follows:



void getTransform(point x) {

	glTranslatef(21, 0, 0.0);

	if (counter % 10 == 0 && counter >= 10) {

		glTranslatef(0, 21, 0);

		glTranslatef(-210, 0, 0);

	}

	counter++;

}

Any help would be appreciated.

Erik Rufelt

5,903

March 12, 2011 09:50 PM

Add another glLoadIdentity after glMatrixMode (GL_MODELVIEW)

thyrgle

116

Author

March 13, 2011 05:32 AM

@Erik:

I have tried what you suggest. But, I am still getting a translation.

Before redisplay:
[attachment=1628:Screen shot 2011-03-12 at 9.29.35 PM.png]

After redisplay:
[attachment=1629:Screen shot 2011-03-12 at 9.29.47 PM.png]

thyrgle

116

Author

March 13, 2011 07:26 PM

Figured it out, did not reset counter variable...

How can I make this thing not move when I redisplay it?

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How can I make this thing not move when I redisplay it?

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