platformer

#include <iostream>
#include <string>
using namespace std;

#include "olcConsoleGameEngine.h"

class game : public olcConsoleGameEngine
{
public:
    game() { m_sAppName = L"Terrible Game"; }
    ~game() {}
private:
    wstring sLevel;
    int nLevelHeight;
    int nLevelWidth;

    float fPlayerPosX = 0.0f;
    float fPlayerPosY = 0.0f;

    float fPlayerVelX = 0.0f;
    float fPlayerVelY = 0.0f;

    float fCameraPosX = 0.0f;
    float fCameraPosY = 0.0f;
protected:
    virtual bool OnUserCreate() override
    {
        nLevelWidth = 64;
        nLevelHeight = 16;
        sLevel += L"................................................................";
        sLevel += L"................................................................";
        sLevel += L"......#######...................................................";
        sLevel += L"........###.....................................................";
        sLevel += L".......................########.................................";
        sLevel += L".....##########.......###..............#.#......................";
        sLevel += L"....................###................#.#......................";
        sLevel += L"...................####.........................................";
        sLevel += L"####################################.##############.....########";
        sLevel += L"...................................#.#...............###........";
        sLevel += L"........................############.#............###...........";
        sLevel += L"........................#............#.........###..............";
        sLevel += L"........................#.############......###.................";
        sLevel += L"........................#................###....................";
        sLevel += L"........................#################.......................";
        sLevel += L"................................................................";

        return true;
    }

    virtual bool OnUserUpdate(float fElapsedTime) override
    {
        //utility lambdas (to do some stuff to make life easier)
        auto GetTile = [&](int x, int y)
        {
            if (x >= 0 &&  x < nLevelWidth && y >= 0 && y < nLevelHeight)
                return sLevel[y * nLevelWidth + x];
            else
                return L' ';
        };

        auto SetTile = [&](int x, int y, wchar_t c)
        {
            if (x >= 0 && x < nLevelWidth && y >= 0 && y < nLevelHeight)
                sLevel[y * nLevelWidth + x] = c;
        };

        fPlayerVelX = 0.0f;
        fPlayerVelY = 0.0f;

        //handle input
        if (IsFocused())
        {
            if (GetKey(VK_UP).bHeld)
            {
                fPlayerVelY = -6.0f;
            }

            if (GetKey(VK_DOWN).bHeld)
            {
                fPlayerVelY = 6.0f;
            }

            if (GetKey(VK_LEFT).bHeld)
            {
                fPlayerVelX = -6.0f;
            }

            if (GetKey(VK_RIGHT).bHeld)
            {
                fPlayerVelX = 6.0f;
            }

        }

        fPlayerPosX = fPlayerPosX + fPlayerVelX * fElapsedTime;
        fPlayerPosY = fPlayerPosY + fPlayerVelY * fElapsedTime;

        fCameraPosX = fPlayerPosX;
        fCameraPosY = fPlayerPosY;

        //draw level
        int nTileWidth = 16;
        int nTileHeight = 16;
        int nVisibleTilesX = ScreenWidth() / nTileWidth;
        int nVisibleTilesY = ScreenHeight() / nTileHeight;

        //calculate the top-leftmost visible tile
        float fOffsetX = fCameraPosX - (float)nVisibleTilesX / 2.0f;
        float fOffsetY = fCameraPosY - (float)nVisibleTilesY / 2.0f;

        //clamp camera to game boundaries so it doesn't do outside of the map
        if (fOffsetX < 0) fOffsetX = 0;
        if (fOffsetY < 0) fOffsetY = 0;
        if (fOffsetX > nLevelWidth - nVisibleTilesX) fOffsetX = nLevelWidth - nVisibleTilesX;
        if (fOffsetY > nLevelHeight - nVisibleTilesY) fOffsetY = nLevelHeight - nVisibleTilesY;

        for (int x = 0; x < nVisibleTilesX; x++)
        {
            for (int y = 0; x < nVisibleTilesY; y++)
            {
                wchar_t sTileID = GetTile(x + fOffsetX, y + fOffsetY);
                switch (sTileID)
                {
                case L'.':
                    Fill(x * nTileWidth, y * nTileHeight, (x + 1) * nTileWidth, (y + 1) * nTileHeight, PIXEL_SOLID, FG_CYAN);
                    break;
                case L'#':
                    Fill(x * nTileWidth, y * nTileHeight, (x + 1) * nTileWidth, (y + 1) * nTileHeight, PIXEL_SOLID, FG_RED);
                    break;
                default:
                    Fill(x * nTileWidth, y * nTileHeight, (x + 1) * nTileWidth, (y + 1) * nTileHeight, PIXEL_SOLID, FG_BLACK);
                    break;
                }
            }
        }

        Fill((fPlayerPosX - fOffsetX) * nTileWidth, (fPlayerPosY - fOffsetY) * nTileHeight, (fPlayerPosX - fOffsetX + 1) * nTileWidth, (fPlayerPosY - fOffsetY + 1) * nTileHeight, PIXEL_SOLID, FG_GREEN);

        return true;
    }
};


int main()
{
    game g;
    if (g.ConstructConsole(256, 240, 4, 4))
        g.Start();
    return 0;
}