Helpful Drawing Code.txt

This legacy OpenGL code might be useful for drawing/displaying the 
physics parts of the assignment.

Remember, this code will have to go into an object's Draw() function
or
In the drawScene() function (between gluLookAt() and glutSwapBuffers())  in main.cpp to show.

 -- Line Drawing --

You can draw a line between two points via the below code. 
This could be useful for visually showing forces, acceleration, velocity, boundaries etc.

The indention isn't needed - it just makes it easier to read.

This example draws a red line between (0, 0, 0) and (1, 1, 1).

glPushMatrix();
	glBegin(GL_LINES); //note its GL_LINES and not GL_LINE!
	glColor3f(1, 0, 0); //give the line a colour
	glVertex3f(0, 0, 0); //line start
	glVertex3f(1, 1, 1); //line end
	glEnd();
glPopMatrix();

This example uses an object's position to draw the positive axis from its center.
Each 2 points passed in via glVertex3f creates 1 line (so this example has 3 lines in one glBegin()).

glPushMatrix();
	glBegin(GL_LINES);

		glColor3f(1, 0, 0);
		glVertex3f(x, y, z); //uses the game objects position values
		glVertex3f(x + 3, y, z); //positive x axis

		glColor3f(0, 1, 0); //note the colour change per line
		glVertex3f(x, y, z);
		glVertex3f(x, y + 3, z); //positive y axis

		glColor3f(1, 0, 1);
		glVertex3f(x, y, z);
		glVertex3f(x, y, z + 3); //positive z axis
	glEnd();
glPopMatrix();

-- Debug Object Drawing --

If you want to place a wireframe object around an object (perhaps to show a collider).
Choose whatever radius/size value you need to make the debug object bigger or smaller.
This would be done seperate to the push and pop you have for the normal objects drawing.

//normal objects push/pop drawing code here first

glPushMatrix();
	glTranslatef(x, y, z); //go the the game objects position
	glColor3f(1, 0, 1); //make it magneta for easy debug testing
	glutWireSphere(radius, 10, 10);  //where radius is a float
	//or
	//glutWireCube(size); //where size is a float
glPopMatrix();

-- Colour changes --

You may want to change the colour of an object when something happens (like a collision).
This can be done by changing the public colour variables of the object directly.