Introduction To C++ Programming Assignment 7 Setting the Curve Objectives: Learn
ID: 3914068 • Letter: I
Question
Introduction To C++ Programming Assignment 7 Setting the Curve Objectives: Learn () ho to mplement Eunctions by passing arrays as arguments and (2) how to use Graphics with SFML Graphics Application Programmer Interface (APT) Instructions: This assignment is to write a program that will display a histogram representing the number of scores associated with each grade Your program should execute with the following behavior Step 1: Get from the user the number of possible different letter grades, maximum anticipated students in a given letter grade, and the file containing the scores. Step 2: For each letter grade. Step 2.1: Get from the user the grade string and range of possible scores for that grade. Step 2.2: Open the file containing the scores. Step 2.3: Determine the number of scores in the file in the specified range Step 2.4: Close the file Step 3: Label the grade and draw the grade bar. Step 4: Diagnostics If the total number of scores does not match the number of scores in the specified grade ranges, you should print the following messages: The total number of scores is greater than the number of scores in the specified grade ranges Make sure the ranges include al1l possible grades and try again (This may occur when the grade ranges do not span the range oE o-10C) The number of scores in the specified grade ranges is greater than the total number of scores Make sure the ranges do not overlap and try again (This may occur when the grade ranges overlap, and so some grades are counted in rultiple ranges) Hint: You may find it easier to implement step 4 within initFrequency
Explanation / Answer
main.cpp
#include "SFML/Graphics.hpp"
#include <iostream>
#include <fstream>
#include <string>
const float WIDTH = 550.0; // width of the window for display
const float HEIGHT = 750.0; // height of the window for display
const int FONT_SIZE = 25; // character size
const float LEFT_X = 100.0; // Left X position for label
const float LOW_Y = 700.0; // LOW Y position for label
const float HIGH_Y = 50.0; // HIGH Y position for label
using namespace std;
// Function prototypes - you need to implement
void readConfig(int &numGrades, int &maxInGrade, string &filename);
int findNumInRange(string filename, int low, int high);
void initFrequency(string letters[], int freqLetters[],
int numGrades, string filename);
void setCurves(sf::RectangleShape bars[], sf::Text labels[], int freqLetters[],
string letters[], sf::Font &font, int numGrades, int maxInGrades);
/* DON'T CHANGE THE ABOVE CODE */
int main() {
int numGrades = 5; // number of different letter grades
int maxInGrade = 20; // maximum number of students in any letter grade
string filename; // name of input file containing scores
// STEP 1:
// IMPLEMENT readConfig that initializes (1) numGrades, (2) maxInGrade, and
// (3) filename
//
string letters[numGrades]; // each entry represents string representing the grade
int freqLetters[numGrades]; // each entry records occurrence of grades corresponding
// to the letter grade
// STEP 2:
// IMPLEMENT initFrequency that initializes letters[] and freqLetters[] by processing
// input file (filename).
// You need to replace the following for loop with a call to initFrequency
//
for (int i = 0; i < numGrades; i++) {
letters[i] = 'A'+i;
freqLetters[i] = 15+i;
}
//
// DON'T CHANGE FOLLOWING CODE
//
sf::RenderWindow window(sf::VideoMode(600, 800), "Grade Histogram");
sf::Font font;
font.loadFromFile("resources/arial.ttf");
/* DON'T CHANGE ABOVE CODE */
// You are free to change the following code. However, as it is, it should work
sf::Text min, max;
min.setFillColor(sf::Color::Yellow);
min.setFont(font);
min.setString("0");
min.setCharacterSize(FONT_SIZE);
max.setFillColor(sf::Color::Yellow);
max.setFont(font);
max.setString(to_string(maxInGrade));
max.setCharacterSize(FONT_SIZE);
min.setPosition(LEFT_X-FONT_SIZE*2, LOW_Y-FONT_SIZE);
max.setPosition(LEFT_X-FONT_SIZE*2, HIGH_Y-FONT_SIZE/2);
sf::RectangleShape bars[numGrades];
sf::Text labels[numGrades];
// STEP 3:
// IMPLEMENT setTheCurves and replace the following initialization
// code with a call to setTheCurves
//
float x_incr = (WIDTH - 100)/numGrades;
float x_offset = LEFT_X+FONT_SIZE;
float height_unit_pixels = (HEIGHT - (HIGH_Y + FONT_SIZE)) / maxInGrade;
int count = 0;
for (int i=0; i < numGrades; i++) {
float height = freqLetters[i] > maxInGrade ? maxInGrade : freqLetters[i];
bars[i].setSize(sf::Vector2f(x_incr-50, height*height_unit_pixels));
bars[i].setPosition(x_offset+x_incr/2, LOW_Y);
bars[i].rotate(180);
labels[i].setFillColor(sf::Color::Yellow);
labels[i].setFont(font);
labels[i].setString(letters[i]);
labels[i].setCharacterSize(FONT_SIZE);
labels[i].setFillColor(sf::Color::Red);
labels[i].setPosition(bars[i].getPosition().x-FONT_SIZE, LOW_Y+FONT_SIZE);
x_offset += x_incr;
}
/* DON'T CHANGE THE FOLLOWING CODE */
while (window.isOpen()) {
sf::Event event;
while (window.pollEvent(event)) {
switch (event.type) {
case sf::Event::Closed:
window.close();
break;
default:
window.clear();
window.draw(min);
window.draw(max);
for (int i = 0; i < numGrades; i++) {
window.draw(bars[i]);
window.draw(labels[i]);
}
window.display();
}
}
}
return 0;
}
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