Console Window 3D Engine (C++)

#define NOMINMAX
#define WIN32_LEAN_AND_MEAN
#include <Windows.h>
#include <iostream>
#include <math.h>
#include <string>
using namespace std;
 
class Vertex
{
public:
    float x;
    float y;
    float z;
};
 
struct CONSOLE_FONT
{
    DWORD index;
    COORD dim;
};
 
enum class COLOR
{
    FG_BLACK = 0x0000,
    FG_DARK_BLUE = 0x0001,
    FG_DARK_GREEN = 0x0002,
    FG_DARK_CYAN = 0x0003,
    FG_DARK_RED = 0x0004,
    FG_DARK_MAGENTA = 0x0005,
    FG_DARK_YELLOW = 0x0006,
    FG_GREY = 0x0007,
    FG_DARK_GREY = 0x0008,
    FG_BLUE = 0x0009,
    FG_GREEN = 0x000A,
    FG_CYAN = 0x000B,
    FG_RED = 0x000C,
    FG_MAGENTA = 0x000D,
    FG_YELLOW = 0x000E,
    FG_WHITE = 0x000F,
    BG_BLACK = 0x0000,
    BG_DARK_BLUE = 0x0010,
    BG_DARK_GREEN = 0x0020,
    BG_DARK_CYAN = 0x0030,
    BG_DARK_RED = 0x0040,
    BG_DARK_MAGENTA = 0x0050,
    BG_DARK_YELLOW = 0x0060,
    BG_GREY = 0x0070,
    BG_DARK_GREY = 0x0080,
    BG_BLUE = 0x0090,
    BG_GREEN = 0x00A0,
    BG_CYAN = 0x00B0,
    BG_RED = 0x00C0,
    BG_MAGENTA = 0x00D0,
    BG_YELLOW = 0x00E0,
    BG_WHITE = 0x00F0,
};
 
void Draw_Text(CHAR_INFO* screen_buffer, string text, float sx, float sy, int character_screen_width, int character_screen_height, COLOR color);
int main();
 
int keystate;
Vertex vertex_list[4];
Vertex temp_list[4];
Vertex local_list[4];
Vertex camera_list[4];
Vertex perspective_list[4];
Vertex screen_list[4];
Vertex angle;
Vertex cam;
 
void Draw_Text(CHAR_INFO* screen_buffer, string text, float sx, float sy, int character_screen_width, int character_screen_height, COLOR color)
{
    if (sx >= character_screen_width - 1) sx = 0.0f;
 
    for (int x = 0; x < static_cast<int>(text.length()); x++)
    {
        if (sx >= 0 && sx < character_screen_width && sy >= 0 && sy < character_screen_height)
        {
            screen_buffer[static_cast<int>(sy) * character_screen_width + static_cast<int>(sx + x)].Char.UnicodeChar = text[x];
            screen_buffer[static_cast<int>(sy) * character_screen_width + static_cast<int>(sx + x)].Attributes = static_cast<WORD>(color);
        }
    }
}
 
void Draw_Bresenham_Line(CHAR_INFO* screen_buffer, int x1, int y1, int x2, int y2, int character_screen_width, int character_screen_height, COLOR color)
{
    int x, y, dx, dy, dx1, dy1, px, py, xe, ye, i;
    dx = x2 - x1;
    dy = y2 - y1;
    dx1 = static_cast<int>(fabs(dx));
    dy1 = static_cast<int>(fabs(dy));
    px = 2 * dy1 - dx1;
    py = 2 * dx1 - dy1;
 
    if (dy1 <= dx1)
    {
        if (dx >= 0)
        {
            x = x1;
            y = y1;
            xe = x2;
        }
        else
        {
            x = x2;
            y = y2;
            xe = x1;
        }
 
        if (x >= 0 && x < character_screen_width && y >= 0 && y < character_screen_height)
        {
            screen_buffer[y * character_screen_width + x].Char.UnicodeChar = ' ';
            screen_buffer[y * character_screen_width + x].Attributes = static_cast<WORD>(color);
        }
 
        for (i = 0; x < xe; i++)
        {
            x = x + 1;
 
            if (px < 0)
            {
                px = px + 2 * dy1;
            }
            else
            {
                if ((dx < 0 && dy < 0) || (dx > 0 && dy > 0))
                {
                    y = y + 1;
                }
                else
                {
                    y = y - 1;
                }
                px = px + 2 * (dy1 - dx1);
            }
 
            if (x >= 0 && x < character_screen_width && y >= 0 && y < character_screen_height)
            {
                screen_buffer[y * character_screen_width + x].Char.UnicodeChar = ' ';
                screen_buffer[y * character_screen_width + x].Attributes = static_cast<WORD>(color);
            }
        }
    }
    else
    {
        if (dy >= 0)
        {
            x = x1;
            y = y1;
            ye = y2;
        }
        else
        {
            x = x2;
            y = y2;
            ye = y1;
        }
 
        if (x >= 0 && x < character_screen_width && y >= 0 && y < character_screen_height)
        {
            screen_buffer[y * character_screen_width + x].Char.UnicodeChar = ' ';
            screen_buffer[y * character_screen_width + x].Attributes = static_cast<WORD>(color);
        }
 
        for (i = 0; y < ye; i++)
        {
            y = y + 1;
 
            if (py <= 0)
            {
                py = py + 2 * dx1;
            }
            else
            {
                if ((dx < 0 && dy < 0) || (dx > 0 && dy > 0))
                {
                    x = x + 1;
                }
                else
                {
                    x = x - 1;
                }
                py = py + 2 * (dx1 - dy1);
            }
 
            if (x >= 0 && x < character_screen_width && y >= 0 && y < character_screen_height)
            {
                screen_buffer[y * character_screen_width + x].Char.UnicodeChar = ' ';
                screen_buffer[y * character_screen_width + x].Attributes = static_cast<WORD>(color);
            }
        }
    }
}
 
 
int main()
{
    const float PI = 3.14159265358979f;
    const float RADIAN = PI / 180.0f;
    const float FOV = 90.0f;
 
    vertex_list[0].x = -50.0f; vertex_list[0].y = 50.0f; vertex_list[0].z = 0.0f;
    vertex_list[1].x = 50.0f; vertex_list[1].y = 50.0f; vertex_list[1].z = 0.0f;
    vertex_list[2].x = -50.0f; vertex_list[2].y = -50.0f; vertex_list[2].z = 0.0f;
    vertex_list[3].x = 50.0f; vertex_list[3].y = -50.0f; vertex_list[3].z = 0.0f;
 
    //// Get console font size
    //CONSOLE_FONT fonts = {};
    //fonts.dim = GetConsoleFontSize(console, fonts.index);
    //int fontw = fonts.dim.x;
    //int fonth = fonts.dim.y;
 
    CONSOLE_FONT_INFOEX cfi;
    cfi.cbSize = sizeof(cfi);
    cfi.nFont = 0;
    cfi.dwFontSize.X = 20;
    cfi.dwFontSize.Y = 20;
    cfi.FontFamily = FF_DONTCARE;
    cfi.FontWeight = FW_NORMAL;
 
    int screen_width = 1280;
    int screen_height = 720;
    int character_screen_width = static_cast<int>(floor((screen_width) / (cfi.dwFontSize.X)));
    int character_screen_height = static_cast<int>(floor((screen_height - 39) / (cfi.dwFontSize.Y))) + 1;
 
    HANDLE console = GetStdHandle(STD_OUTPUT_HANDLE);
 
    CONSOLE_SCREEN_BUFFER_INFO SBInfo;
    COORD NewSBSize;
 
    GetConsoleScreenBufferInfo(console, &SBInfo);
    NewSBSize.X = SBInfo.srWindow.Right - SBInfo.srWindow.Left + 1;
    NewSBSize.Y = SBInfo.srWindow.Bottom - SBInfo.srWindow.Top + 1;
 
    SetConsoleScreenBufferSize(console, NewSBSize);
 
    // Setup Console window
    SMALL_RECT m_rectWindow = { 0, 0, (short)character_screen_width - 1, (short)character_screen_height - 1 };
 
    SetConsoleActiveScreenBuffer(console);
    SetCurrentConsoleFontEx(console, false, &cfi);
 
    // Resize Console window
    RECT r;
    GetWindowRect(GetConsoleWindow(), &r); //stores the console's current dimensions
    MoveWindow(GetConsoleWindow(), r.left, r.top, screen_width, screen_height, TRUE);
 
    // Setup screen buffer
    CHAR_INFO* screen_buffer = new CHAR_INFO[character_screen_width * character_screen_height];
 
    // Make key cursor invisible
    CONSOLE_CURSOR_INFO cursor_info;
    GetConsoleCursorInfo(console, &cursor_info);
    cursor_info.bVisible = false; // set the cursor visibility
    SetConsoleCursorInfo(console, &cursor_info);
 
    // Set key cursor to beginning
    SetConsoleCursorPosition(console, { 0, 0 });
 
    cam.x = 0.0f;
    cam.y = 0.0f;
    cam.z = 400.0f;
 
    while (true)
    {
        angle.x = 0.0f;
        angle.y += 0.1f;
        angle.z = 0.0f;
 
        for (int i = 0; i < 4; i++)
        {
            temp_list[i].x = vertex_list[i].x * (cosf(angle.y * RADIAN) * cosf(angle.z * RADIAN)) + vertex_list[i].y * ((sinf(angle.x * RADIAN) * sinf(angle.y * RADIAN) * cosf(angle.z * RADIAN)) + (cosf(angle.x * RADIAN) * -sinf(angle.z * RADIAN))) + vertex_list[i].z * (cosf(angle.x * RADIAN) * sinf(angle.y * RADIAN) * cosf(angle.z * RADIAN)) + (-sinf(angle.x * RADIAN) * -sinf(angle.z * RADIAN));
            temp_list[i].y = vertex_list[i].x * (cosf(angle.y * RADIAN) * sinf(angle.z * RADIAN)) + vertex_list[i].y * ((sinf(angle.x * RADIAN) * sinf(angle.y * RADIAN) * sinf(angle.z * RADIAN)) + (cosf(angle.x * RADIAN) * cosf(angle.z * RADIAN))) + vertex_list[i].z * (cosf(angle.x * RADIAN) * sinf(angle.y * RADIAN) * sinf(angle.z * RADIAN)) + (-sinf(angle.x * RADIAN) * cosf(angle.z * RADIAN));
            temp_list[i].z = vertex_list[i].x * (-sinf(angle.y * RADIAN)) + vertex_list[i].y * (sinf(angle.x * RADIAN) * cosf(angle.y * RADIAN)) + vertex_list[i].z * (cosf(angle.x * RADIAN) * cosf(angle.y * RADIAN));
 
            local_list[i] = temp_list[i];
 
        }
 
        if (GetAsyncKeyState('W')) 
            keystate |= 0x1;
        else
            keystate &= ~0x1;
 
        if (GetAsyncKeyState('S')) 
            keystate |= 0x2;
        else
            keystate &= ~0x2;
 
        if (GetAsyncKeyState('A')) 
            keystate |= 0x4;
        else
            keystate &= ~0x4;
 
        if (GetAsyncKeyState('D')) 
            keystate |= 0x8;
        else
            keystate &= ~0x8;
 
        if (keystate & 0x1) cam.z -= 0.5f;
        if (keystate & 0x2) cam.z += 0.5f;
        if (keystate & 0x4) cam.x -= 0.5f;
        if (keystate & 0x8) cam.x += 0.5f;
 
        wchar_t buffer[256];
        swprintf_s(buffer, 256, L"3D: %f, %f", cam.x, cam.z);
        SetConsoleTitle(buffer);
 
        // Clear screen
        memset(screen_buffer, 0, sizeof(CHAR_INFO) * character_screen_width * character_screen_height);
 
        Draw_Text(screen_buffer, "Press W, S, A, and D keys to move around", 0, 0, character_screen_width, character_screen_height, COLOR::FG_WHITE);
        
        float aspect = 16.0f / 9.0f;
        float distance = tanf(PI * (FOV / 2.0f) / 180.0f);
 
        for (int i = 0; i < 4; i++)
        {
            camera_list[i].x = local_list[i].x + cam.x;
            camera_list[i].y = local_list[i].y + cam.y;
            camera_list[i].z = local_list[i].z + cam.z;
 
            if (camera_list[i].z > 0.0f) 
            {
                perspective_list[i].x = distance * camera_list[i].x / camera_list[i].z;
                perspective_list[i].y = distance * camera_list[i].y * aspect / camera_list[i].z;
                perspective_list[i].z = 0.0f;
            }
 
 
            float alpha = 0.5f * character_screen_width - 0.5f;
            float beta = 0.5f * character_screen_height - 0.5f;
 
            screen_list[i].x = alpha + alpha * perspective_list[i].x;
            screen_list[i].y = beta - beta * perspective_list[i].y;
            screen_list[i].z = 0.0f;
        }
 
        Draw_Bresenham_Line(screen_buffer, static_cast<int>(screen_list[0].x), static_cast<int>(screen_list[0].y), static_cast<int>(screen_list[1].x), static_cast<int>(screen_list[1].y), character_screen_width, character_screen_height, COLOR::BG_WHITE);
        Draw_Bresenham_Line(screen_buffer, static_cast<int>(screen_list[1].x), static_cast<int>(screen_list[1].y), static_cast<int>(screen_list[2].x), static_cast<int>(screen_list[2].y), character_screen_width, character_screen_height, COLOR::BG_WHITE);
        Draw_Bresenham_Line(screen_buffer, static_cast<int>(screen_list[2].x), static_cast<int>(screen_list[2].y), static_cast<int>(screen_list[0].x), static_cast<int>(screen_list[0].y), character_screen_width, character_screen_height, COLOR::BG_WHITE);
 
        Draw_Bresenham_Line(screen_buffer, static_cast<int>(screen_list[1].x), static_cast<int>(screen_list[1].y), static_cast<int>(screen_list[2].x), static_cast<int>(screen_list[2].y), character_screen_width, character_screen_height, COLOR::BG_WHITE);
        Draw_Bresenham_Line(screen_buffer, static_cast<int>(screen_list[2].x), static_cast<int>(screen_list[2].y), static_cast<int>(screen_list[3].x), static_cast<int>(screen_list[3].y), character_screen_width, character_screen_height, COLOR::BG_WHITE);
        Draw_Bresenham_Line(screen_buffer, static_cast<int>(screen_list[3].x), static_cast<int>(screen_list[3].y), static_cast<int>(screen_list[1].x), static_cast<int>(screen_list[1].y), character_screen_width, character_screen_height, COLOR::BG_WHITE);
 
        // Draw buffer to Console Window
        WriteConsoleOutput(console, screen_buffer, { (short)character_screen_width, (short)character_screen_height }, { 0,0 }, &m_rectWindow);
    }
 
    return 0;
}