Hi,
I am writing a C++ code that draws a sine curve. The code is fine, but when I run it (the compiled output) I get strange characters for both x- and y- axis. They look like a small oval with a question mark in it. I tried to run in it in a xfce4-terminal and this time, I could not see any of the axis, so I figured it has to do with playing with configuration of either console of Terminal (or gnome-terminal). Here is the code for testing:
Code:
/* -----------------------------------------------------
* sinCurve.cpp
* Outputs a sine curve
* -----------------------------------------------------
*/
#include <iostream>
#include <cmath> // Prototypes of sin()
using namespace std;
#define CLS (cout << "\033[2J")
#define LOCATE(z,s) (cout <<"\033["<<(z)<<';'<<(s)<<'H')
#define PI 3.1415926536
#define START 0.0 // Lower limit
#define END (2.0 * PI) // Upper limit
#define PNT 64 // Number of points on the curve
#define STEP ((END-START)/PNT)
#define xA 14 // Row of x-axis
#define yA 10 // Column of y-axis
int main()
{
int row, column;
CLS;
LOCATE(2,25);
cout << "------- The Sine Function -------";
// --- Draws the coordinate system: ---
LOCATE(xA,1); // x-axis
for( column = 1 ; column < 78 ; ++column)
{
cout << ((column - yA) % 8 ? '\304' : '\305');
}
cout << '\020'; // top
LOCATE(xA-1, yA+64); cout << "2PI x";
for( row = 5 ; row < 24 ; ++row) // y-axis
{
LOCATE(row, yA); cout << '\305';
}
LOCATE( 4, yA); cout << "\036 sin(x)"; // top
LOCATE( xA-8, yA+1); cout << " 1";
LOCATE( xA+8, yA+1); cout << " -1";
// --- Displays the sine function: ---
int begpt = yA,
endpt = begpt + PNT;
for( column = begpt ; column <= endpt ; ++column)
{
double x = (column-yA) * STEP;
row = xA - 8 * sin(x) + 0.5;
LOCATE( row, column); cout << '.';
}
LOCATE(25,1); // Cursor to the last row
return 0;
}
Any clue?
I am using an Ubuntu 11.10 box updated to the latests of packages.
~faizlo
