import graphics3d.Graphics3DFramework;
import Graphics3D;
import Math;  // for using sin function


// Variable to store the ID of the coordinate system
int coord;

// Time counter (in frame update units)
int t = 0;


// Function called at the start of the program
void onStart ( int rendererID ) {

	// Optional: set window size and background color
	setWindowSize( 800, 600 );
	setBackgroundColor( 0, 0, 0, 255 );

	// Create a local coordinate system
	coord = newCoordinate( );

	// Mount it onto the world coordinate system
	mountCoordinate( coord, rendererID );

	// Attach a small axis model to the local coordinate system
	int axis1 = newAxisModel( 1.5, 1.5, 1.5 );
	mountModel( axis1, rendererID, coord );

	// Attach a large axis model to the world coordinate system
	int axis2 = newAxisModel( 3.0, 3.0, 3.0 );
	mountModel( axis2, rendererID );
}


//Function called multiple times per second to update the screen
void onUpdate (int renderer) {

	// Control orientation using Euler angles
	setCoordinateAngle(
		coord,
		0.08*t, 0.5*sin(0.03*t), 0.3*t
	);

	// Advance time counter
	t++;
}