Bresenham C++ Demo

bresenham.cpp

#include <stdio.h>

#define WIDTH 20
#define HEIGHT 20


char buffer[HEIGHT][WIDTH] = {} ;

void draw() { 
    for(int y=0;y<HEIGHT;y++) {
        for(int x=0;x<WIDTH;x++){
            printf("%c ",buffer[y][x]);
        }
        printf("\n"); 
    }
}
void scan() { 
    for(int y=0;y<HEIGHT;y++) {
        for(int x=0;x<WIDTH;x++){ 
            buffer[y][x]='0';
        }
    } 
}
// function for line generation 
void bresenham(int x1, int y1, int x2, int y2,char c) 
{ 
    int m_new = 2 * (y2 - y1); 
    int slope_error_new = m_new - (x2 - x1); 
    for (int x = x1, y = y1; x <= x2; x++) { 
        buffer[y][x]=c;
  
        // Add slope to increment angle formed 
        slope_error_new += m_new; 
  
        // Slope error reached limit, time to 
        // increment y and update slope error. 
        if (slope_error_new >= 0) { 
            y++; 
            slope_error_new -= 2 * (x2 - x1); 
        } 
    } 
} 
  
int main() { 
    scan();
    bresenham(0,0,10,6,'x');
    draw();
    printf("HELLO WORLD!\n");
    return 0;
}