2. Draw Charts In this lab, you will make a C program to read a data file and dr

Question

2. Draw Charts In this lab, you will make a C program to read a data file and draw an xy chart for each data file based on the following guidelines: The filename is given as an optional argument of a command. If no argument is given, it prints a help message to guide a correct usage. Two data files are given ( dat). Each line of the data file contains two floating-point values as x and y. Draw x and y axis and ticks. Use arrows to positive directions. Draw the chart at the center of the paper. [Challenge] Find out appropriate x and y crosspoint. [Challenge] Draw labels. . ·

Explanation / Answer

#include <stdlib.h>

#include <stdio.h>

#define NUM_POINTS 50

#define NUM_COMMANDS 50

int main()

{

  

float xvals[NUM_POINTS];

float yvals[NUM_POINTS];

char file[256];

scanf("%s",&file);

if(!file)

{

printf("Enter a filename for the program to work.");

}

fptr = fopen(file, "r");

FILE * temp = fopen(file, "w");

char ch = fgetc(fptr);

int i=0;

while(ch != EOF)

{

ch = fgetc(fptr);

xvals[i] = ch;

ch = fgetc(fptr);

yvals[i] = ch;

i++;

}

FILE * gnuplotPipe = popen ("gnuplot -persistent", "w");

fprintf(gnuplotPipe, "plot '-' ");

int i;

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

{

fprintf(gnuplotPipe, "%f %f ", xvals[i], yvals[i]);

}

fprintf(gnuplotPipe, "e");

for (i=0; i < NUM_COMMANDS; i++)

{

fprintf(gnuplotPipe, "%s ", commandsForGnuplot[i]); //Send commands to gnuplot one by one.

}

return 0;

}

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