shape.cpp

//implmentation of the shape helper function
#include "shape.h"
#include "square.h"
#include "rectangle.h"
#include "tty_functions.h"
#include "termmanip.h"
#include <iostream>
#include <unistd.h>
#include <cstdio>

using namespace std;

//clear our menu area
static void clearMenuArea(int firstLine) {
  //clear the three lines of the menu area
  for(int i=firstLine; i<firstLine+3; i++) {
    cout << cursorPosition(1, i) << clearLine;
  }
  cout.flush();
}

shape*
getUserShape() {
  const char *shapeNames[] = { "Square", "Rectangle", "Triangle", "Quit" };
  int n = sizeof(shapeNames) / sizeof(shapeNames[0]);    //number of shapes
  int i;
  int x, y;
  int choice;
  ttySize screenSize = ttyGetSize(STDOUT_FILENO);
  shape *result;
  int firstLine = screenSize.rows - 3;
  
  //display the menu
  clearMenuArea(firstLine);
  x=1;
  y=firstLine;
  for(i=0; i<n; i++) {
    cout << cursorPosition(x, y) 
	 << i+1 << ".) " << shapeNames[i];

    //update y
    y++;  //move down a notch
    //handle end of the column
    if(y>firstLine+1) {
      y = firstLine; //go back up
      x+= 20;        //move over
    }
  }

  //get the user choice
  cout << cursorPosition(1, firstLine+2) << "Choice: ";
  cin >> choice;

  //perform the choice
  clearMenuArea(firstLine);
  switch(choice) {
  case 1: //Square
    result = new square;
    result->getUserParameters(firstLine);
    break;
  case 2: //Rectangle
    result = new rectangle;
    result->getUserParameters(firstLine);
    break;
  case 3: //Triangle
    result = 0x0;  //TODO Implement triangle
    break;
  default:
    result = 0x0;  //quit case
  }
  
  return result;
}