/*****************************************************************************/
/* ECE-1011 Summer 2003                                                      */
/* Section:......... 0                                                       */
/* Assignment:...... 1                                                       */
/* Programmer:...... BAHN, William L.                                        */
/* File Contents:... SOURCE CODE                                             */
/* Filename:........ s10_bahw.c                                              */
/* Due Date:........ 11 JUN 03                                               */
/* E-mail Address:.. wbahn@eas.uccs.edu                                      */
/*****************************************************************************/

/*****************************************************************************/
/***************************** INCLUDE FILES *********************************/
/*****************************************************************************/

#include <stdio.h> // printf()
#include <math.h>  // sin()

/*****************************************************************************/
/********************* PROGRAMMER DEFINED CONSTANTS **************************/
/*****************************************************************************/

#define PI (3.1415926345)
#define PERIOD (25)

/*****************************************************************************/
/***************************** MAIN PROGRAM **********************************/
/*****************************************************************************/

int main(void)
{
	int t, col;
	int y_sq, y_sine, y_tri, y_saw;

	t = 0;
	while(t < 250)
	{
		y_sine = 9 * sin( ((2*PI)/PERIOD) * t);
		y_saw  = 2 * 9 * ((double) (t%PERIOD) / (double) PERIOD);  // Amp changed
		if(sin(((2*PI)/PERIOD) * t) < 0.0)
			y_sq = -9;
		else
			y_sq = 9;

		// NEW CODE for HW#1 ==========================================
		// CALCULATE TRIANGLE WAVE VALUE
		// A SawTooth wave goes from min to max in 1 period.
		// A Triangle wave goes from min to max is 1/4 period.
		// So a Triangle wave has four times the slope.
		y_tri  = 4 * 9 * ((double) (t%PERIOD) / (double) PERIOD);

		// Move it down so that it starts at the minimum point.
		y_tri -= 9;

		// If the sine function is negative, invert the function.
		if(0.0 > y_sine)
		{
			y_tri *= -1;

			// And adjust so that ending point is at the minimum.
			// Original value of y_tri at the end would be 36 (actually, 35)
			// After the above offset it would be 36-9 = 27
			// After the inversion it would be -27
			// To get it back to -9 we need to add 18

			y_tri += 18;
		}
		// END NEW CODE for HW#1 ======================================


		for(col=1; col<20; col++)
		{
			if(col-10 == y_sine)
				printf("o");
			else
				printf(" ");
		}

		for(col=1; col<20; col++)
		{
			if(col == y_saw) // Scaling changed to match amplitude change above.
				printf("\\");
			else
				printf(" ");
		}

		for(col=1; col<20; col++)
		{
			if(col-10 == y_sq)
				printf("|");
			else
				printf(" ");
		}

		// NEW CODE for HW#1 ==========================================
		// Code Block for y_sq above copied and edits made as noted.

		for(col=1; col<20; col++)
		{
			if(col-10 == y_tri)  // y_sq changed to y_tri on this line.
			{
				if(0.0 < y_sine)  // if() block added to get character right.
					printf("\\");
				else
					printf("/");
			}
			else
				printf(" ");
		}

		// END NEW CODE for HW#1 ======================================

		printf("\n");
		t++;
	}
	return(0);
}