pong_ndless_buffer_1

#include <os.h>
#include <nGUI.h>
#include <nGEO.h>
#include <nMATHS.h>

int randnum(int s); //making my own temporary random function

int main()
{
    // Create a new screen buffer
    ScreenBuffer buffer = GetNewScreenBuffer();

    int x, y, xvel = -256, yvel = 0, l, r, players = 0, seed = 0, die = 0, lmov = 0, rmov = 0, lscore = 0, rscore = 0, ran;
    Color green = RGB(0, 255, 0);
    Color black = RGB(0, 0, 0);
    l = SCREEN_HEIGHT / 2 - 15;
    r = l;
    x = SCREEN_WIDTH * 128;
    y = SCREEN_HEIGHT * 128;
    clearScreen(black, buffer);
    drawStr(1, 0,
            "\n                  PONG\n\n"
            "Created by Epic7\n"
            "Using nRGBlib\n\n"
            "Multiplayer Controls:\n"
            "   - Player 1 up   : 9\n"
            "   - Player 1 down : 3\n"
            "   - Player 2 up   : 7\n"
            "   - Player 2 down : 1\n"
            "Singleplayer Controls:\n"
            "   - Player 1 Up   : 8\n"
            "   - Player 1 Down : 2\n\n"
            "Push Ctrl to Start Multiplayer\n"
            "Push Tab to Start Singleplayer", 1, 1, green, buffer);
    display(buffer);
    while(players  == 0)
    {
        seed++;
        if(isKeyPressed(KEY_NSPIRE_CTRL))
        {
            players = 2;
        }
        else if(isKeyPressed(KEY_NSPIRE_TAB))
        {
            players = 1;
        }
    }
    while(lscore < 10 && rscore < 10 && !isKeyPressed(KEY_NSPIRE_ESC))
    {
        clearScreen(black, buffer);
        l = SCREEN_HEIGHT / 2 - 15;
        r = l;
        x = SCREEN_WIDTH * 128;
        y = SCREEN_HEIGHT * 128;
        die = 0;
        yvel = 0;
        xvel = -256;
        seed = randnum(seed); //my goal is to give yvel a random value -128 to 128
        yvel = seed % 257 - 128;
        while(!isKeyPressed(KEY_NSPIRE_ESC) && die == 0)
        {
            lmov = 0;
            rmov = 0;
            if(players == 2)
            {
                if(isKeyPressed(KEY_NSPIRE_9) && r > 1)
                {
                    drawBox_(SCREEN_WIDTH - 15, r, 5, 30, black, buffer);
                    r--;
                    rmov = -64;
                }
                else if(isKeyPressed(KEY_NSPIRE_3) && r < SCREEN_HEIGHT - 30)
                {
                    drawBox_(SCREEN_WIDTH - 15, r, 5, 30, black, buffer);
                    r++;
                    rmov = 64;
                }
                if(isKeyPressed(KEY_NSPIRE_7) && l > 1)
                {
                    drawBox_(10, l, 5, 30, black, buffer);
                    l--;
                    lmov = -64;
                }
                else if(isKeyPressed(KEY_NSPIRE_1) && l < SCREEN_HEIGHT - 30)
                {
                    drawBox_(10, l, 5, 30, black, buffer);
                    l++;
                    lmov = 64;
                }
            }
            if(players == 1)
            {
                if(isKeyPressed(KEY_NSPIRE_8) && r > 1)
                {
                    drawBox_(SCREEN_WIDTH - 15, r, 5, 30, black, buffer);
                    r--;
                    rmov = -64;
                }
                else if(isKeyPressed(KEY_NSPIRE_2) && r < SCREEN_HEIGHT - 30)
                {
                    drawBox_(SCREEN_WIDTH - 15, r, 5, 30, black, buffer);
                    r++;
                    rmov = 64;
                }
                if(x / 256 < SCREEN_WIDTH / 2)
                {
                    if(y / 256 - 15 < l && l > 1)
                    {
                        drawBox_(10, l, 5, 30, black, buffer);
                        l--;
                        lmov = -64;
                    }
                    else if(y / 256 - 15 > l && l < SCREEN_HEIGHT - 30)
                    {
                        drawBox_(10, l, 5, 30, black, buffer);
                        l++;
                        lmov = 64;
                    }
                }
            }
            if(x / 256 - 4 < 15)
            {
                if((y / 256 + 4 > l) && (y / 256 - 4 < l + 30))
                {
                    xvel = abs(xvel);
                    yvel += lmov;
                }
            }
            if(x / 256 - 4 < 10)
            {
                die = 1;
                lscore++;
            }
            if(x / 256 + 4 > SCREEN_WIDTH - 10)
            {
                die = 1;
                rscore++;
            }


            if(x / 256 + 4 > SCREEN_WIDTH - 15)
            {
                if((y / 256 + 4 > r) && (y / 256 - 4 < r + 30))
                {
                    xvel = -abs(xvel);
                    yvel += rmov;
                }
            }
            if(y / 256 - 4 < 1)
            {
                yvel = -yvel;
            }
            if(y / 256 + 4 > SCREEN_HEIGHT)
            {
                yvel = -yvel;
            }
            drawBox_(10, l, 5, 30, green, buffer);
            drawBox_(SCREEN_WIDTH - 15, r, 5, 30, green, buffer);
            drawDisc_(x / 256, y / 256, 5, black, buffer);
            y += yvel;
            x += xvel;
            drawDisc_(x / 256, y / 256, 5, green, buffer);
            display(buffer);
            sleep(4);
        }
    }
    return 0;
}

int randnum(int s)
{
    return s * 46 - 78 / s * 57 - s + 87 * s; //Why yes, this is my random number formula :P
}