common.cpp

#include "common.h"



float A, B, C;

float cubeWidth = 10;

int width = 160, height = 44;

float zBuffer[160 * 44];

char buffer[160 * 44];

int backgroundASCIICode = ' ';

int distanceFromCam = 60;

float K1 = 50;

float incrementSpeed = 0.45;





float calculateX(int i, int j, int k) {

    return j * sin(A) * sin(B) * cos(C) - k * cos(A) * sin(B) * cos(C) +

           j * cos(A) * sin(C) + k * sin(A) * sin(C) + i * cos(B) * cos(C);

}



float calculateY(int i, int j, int k) {

    return j * cos(A) * cos(C) + k * sin(A) * cos(C) - j

                                                       * sin(A) * sin(B) * sin(C) + k * cos(A) * sin(B) * sin(C) - i * cos(B) * sin(C);

}



float calculateZ(int i, int j, int k) {

    return k * cos(A) * cos(B) - j * sin(A) * cos(B) + i * sin(B);

}



void calculateForSurface(float cubeX, float cubeY, float cubeZ, int ch) {

    float x, y, z, ooz;

    int xp, yp, idx;



    x = calculateX(cubeX, cubeY, cubeZ);

    y = calculateY(cubeX, cubeY, cubeZ);

    z = calculateZ(cubeX, cubeY, cubeZ) + distanceFromCam;



    ooz = 1/z;

    xp = (int)(width/2 - 2 * cubeWidth + K1 * ooz * x * 2);

    yp = (int)(height/2 + K1 * ooz * y);



    idx = xp + yp * width;

    if (ooz > zBuffer[idx]) {

        zBuffer[idx] = ooz;

        buffer[idx] = ch;

    }

}