Controls:

File content as of revision 21:6d4dd906edde:

#include "TetrisGame.h"

volatile int iH;

TetrisGame::TetrisGame()
{

}

TetrisGame::~TetrisGame()
{

}

void TetrisGame::init(int speed)
{
    // initialise game parameters
    _px = 40;
    _py = 4;
    _speed = speed;

    _tetromino.init(_px, _py); // puts tetromino in middle

//    printf("initiate(%i)\n",_speed);

}


void TetrisGame::read_input(Gamepad &pad) // read inputs 
{
    _d = pad.get_direction();
    _mag = pad.get_mag();
}

void TetrisGame::draw(N5110 &lcd) // draw elements in lcd buffer
{


    lcd.drawRect(19, 4, 42, HEIGHT - 4, FILL_TRANSPARENT);

    _tetromino.draw(lcd);

//    printf("draw (%i,%i)\n",_px,_py);

}

void TetrisGame::update(Gamepad &pad, N5110 &lcd) // update values 
{
    // check_score(pad);

    _tetromino.update(_d,_mag);

    check_wall_collision(pad, lcd); // check if block has collided with the floor
    check_tetromino_collisions(pad, lcd); // check if block has collided with an old block

//    printf("update (%i,%i,%i)\n",_px,_py,_d);
}


void TetrisGame::check_wall_collision(Gamepad &pad, N5110 &lcd) // check if block has hit floor
{
    Vector2D tetromino_pos = _tetromino.get_pos(); // get current positioning of block

    if (tetromino_pos.y + 4 >= (HEIGHT-1) ) { // if bottom of block is on bottom boundary 

        tetromino_pos.y = (HEIGHT-1) - 4; // stop block

        pad.tone(750.0,0.1); // play tone 

        cancel_line(lcd); // check if row is full 

        _tetromino.init(_px, _py); // drop new shame

        a = tetromino_pos.x; // save positions to be drawn on next screen
        b = tetromino_pos.y;

        floor_hit_flag = 1; // set flag so program knows to draw block on next screen
        
        if (b <= 4) { // if pattern reaches top of screen 
            exit_game(lcd); // game over 
        }

        printf("floor hit!\n");

    }
//    printf("wall collision\n");
}

void TetrisGame::check_tetromino_collisions(Gamepad &pad, N5110 &lcd) // check if block has old block beneath it 
{
    Vector2D tetromino_pos = _tetromino.get_pos(); // get current position of block

    if (
        (lcd.getPixel(tetromino_pos.x, tetromino_pos.y + 4) == 1) || 
        (lcd.getPixel(tetromino_pos.x + 1, tetromino_pos.y + 4) == 1) ||
        (lcd.getPixel(tetromino_pos.x + 2, tetromino_pos.y + 4) == 1) ||
        (lcd.getPixel(tetromino_pos.x + 3, tetromino_pos.y + 4) == 1) // if any of the 4 pixels directly below the block are black 
    ) {

        pad.tone(1000.0,0.1); // play tone 
        cancel_line(lcd); // check if row is full

        _tetromino.init(_px, _py); // drop new block

        a = tetromino_pos.x; // save positioning of old block
        b = tetromino_pos.y;

        floor_hit_flag = 1; // set flag so program knows to draw block on next screen
        
        if (b <= 4) { // if pattern reaches top of screen 
            exit_game(lcd); // game over 
        }

        printf("blocks stacked!\n");
    }
//    printf("tetromino collision\n");
}

void TetrisGame::cancel_line(N5110 &lcd) // check if row is full, if it is then delete line and drop pattern down 
{
    int count;
    for(int j=4; j<=46; j++) { 
        for(int i=20; i<=60; i++) {
            if (lcd.getPixel(i,j)==0) { // if the pixel is empty the counting stops and exits loop (row is not full)
                count=0;
                break;
            } else if (lcd.getPixel(i,j)==1) { // if the pixel is full carries on counting 
                count ++;
            }
        }
        if(count==61) { // if gets to end of line
            count = 0;
            lcd.drawLine(20,j,60,j,0); // clear line
            printf("line canceled!\n");
//           score++;
            for(int x=20; x<=60; x++) {
                for(int y=j; y>=4; y--) {
                    lcd.setPixel(x,y,false);
                    lcd.setPixel(x,y+1); // sets pixel to the one above
                    printf("line dropped!\n");
                }
            }
        }
    }
//    printf("cancel line\n");

}

void TetrisGame::exit_game(N5110 &lcd)
{
    lcd.clear();
    lcd.printString(" GAME OVER ",0, 3);
    lcd.refresh();
    wait(10);
    printf("game over!\n");
    lcd.clear();
    lcd.printString(" press RESET ",0,6);
    lcd.refresh();
    printf("press reset!\n");
    exit(1.0);
}

void TetrisGame::fallenblocks(N5110 &lcd, int iH)
{
    for (int i=0; i<=iH; i++) {
        x0 = X[i];
        y0 = Y[i];
        lcd.drawRect(x0, y0, 4, 4, FILL_BLACK);
//        printf("block drawn\n");
    }
}