Sine Waver Program

/**
 SineWaver.cpp

 This program will draw sine waves that look like this:

           ,-'`'-,             ,-'`'-,
          /       \           /
         /         \         /
        /           \       /
 `'-.-'`             `'-.-'`

         ,-'`'-,
        /       \
 `'-.-'`         `'-.-'`

 The program requires two arguments: how many periods to
 draw and the height of the wave. I might program in a
 "cosine" option to change whether the wave draws up
 or down to begin with. Ooh, and perhaps cross them too!
*/
#include <stdio.h>
#include <stdlib.h>
#include <iostream>
#include <string>

char upCurve='/';
char dnCurve='\\';
std::string peakPattern=",-'`'-,";
std::string valiPattern="`'-.-'`";

class Wave
{
 private:
  int qPeriod;
  int height;
  int waveX;
  int waveY;
 public:
  Wave(int qperFeed, int hiFeed) : qPeriod(qperFeed), height(hiFeed), waveX(0), waveY(hiFeed)
  {
   // derive the dimensions of the wave which will result

   // we need to check if the lengths of the peak and valley are equal
   int peakLen=peakPattern.length();
   int valiLen=valiPattern.length();
   if (!(peakLen==valiLen)) {
    fprintf(stderr,"Internal error: mismatch between peak and valley string patterns\n");
    exit(4);
   }

   // error checking passed. let's find out how wide our curve will be.
   for (int i=0;i<qPeriod;i++)
   {
    switch (i%4)
    {
     case 0: waveX+=valiLen; break;
     case 1: waveX+=(height-2); break;
     case 2: waveX+=peakLen; break;
     case 3: waveX+=(height-2); break;
    }
   }

   printf("waveX = %d\nwaveY = %d\n",waveX,waveY);
  }

  void draw()
  {
   std::string thisRow;
   char thisChar;
   for (int q=1; q<=waveY; q++)
   {
    thisRow="";
    for (int r=1; r<=waveX; r++)
    {
     int charPos = (r%(peakPattern.length()+(2*(height-2))+valiPattern.length()+1));
     //fprintf(stderr,"%dx%d: %d\n",q,r,charPos);
     if (q==1)
     {
      if ((charPos > valiPattern.length() + (height-2)) &&
      (charPos <= valiPattern.length() + (height-2) + peakPattern.length()))
       thisChar=peakPattern[(charPos-valiPattern.length()-(height-2))-1];
      else
       thisChar=' ';
     }
     else if (q==waveY)
     {
      if (charPos <= valiPattern.length())
       thisChar=valiPattern[charPos-1];
      else
       thisChar=' ';
     }
     else
     {
      if ((charPos > valiPattern.length()) && (charPos <= (valiPattern.length() + height)) &&
      (charPos - valiPattern.length()) == (waveY-q))
       thisChar=upCurve;
      else if (charPos > (valiPattern.length() + (height-2) + peakPattern.length()) &&
      (charPos - (valiPattern.length() + (height-4) + peakPattern.length()) == (q+1)))
       thisChar=dnCurve;
      else
       thisChar=' ';
     }
    thisRow+=thisChar;
    }
    std::cout << thisRow << "P" << std::endl;
   }
  }

  int GetQPeriod() { return qPeriod; }
  int GetHeight() { return height; }
};

int main(int argc, char* argv[])
{
 int noQuarterPeriod;
 int waveHeight;
 if (argc < 3)
 {
  fprintf(stderr,
   "This program requires at least two arguments.\n"
   "Usage: SineWaver #-of-quarter-periods wave-height\n");
  exit(1);
 }
 else
 {
  noQuarterPeriod = atoi(argv[1]);
  if (noQuarterPeriod < 1)
  {
   fprintf(stderr,
    "The number of quarter periods must be a positive number!\n"
    "You gave me %d instead.\n",noQuarterPeriod);
   exit(2);
  }
  waveHeight = atoi(argv[2]);
  if (waveHeight < 2)
  {
   fprintf(stderr,
    "The wave height is too short! The minimum is 2.\n"
    "You gave me a height of %d instead.\n",waveHeight);
   exit(3);
  }
 }

 // We'll make a pretty message by smartly analyzing how many periods we have.
 int noFullPeriod;
 int nQPM=(noQuarterPeriod%4);
 std::string initPattern="Argument requirement satisfied. Generating wave with ";
 if (noQuarterPeriod < 4)
 {
  noFullPeriod=0;
  initPattern+="\%d/\%d period";
 }
 else if (nQPM)
 {
  noFullPeriod=noQuarterPeriod/4;
  initPattern+="\%d \%d/\%d periods";
 }
 else {
  noFullPeriod=noQuarterPeriod/4;
  initPattern+="\%d period";
  if (noFullPeriod>1) { initPattern+="s";}
 }
 initPattern+="...\n";
 printf(initPattern.c_str(),
   (noFullPeriod)?noFullPeriod:(nQPM==2)?1:nQPM,
   (noFullPeriod)?((nQPM==2)?1:nQPM):(nQPM==2)?2:4,
   (nQPM==2)?2:4);
 Wave sineWave(noQuarterPeriod,waveHeight);
 sineWave.draw();

 return 0;
}