File content as of revision 77:5c6bd659c32d:

#include "SnakevsBlock.h"

SnakevsBlock::SnakevsBlock()
{

}

SnakevsBlock::~SnakevsBlock()
{

}

void SnakevsBlock::init()
{
    SnakevsBlock::object_initialisations();
    //The level initialisation and all the other initial information passing will be done here
    level = 1;
    _maxLength = 10; // this makes us go to the next level if if maxLength is achieved;
    garbage = 0; //this is to allow the user to change the position of reference for motion control by saving the absolute angle.
    _dropbuff = 0; //this makes the food fall at diffrent times when a particular level starts.
    send_block_number = 0; //this is 0 when there is no collision, thus block number isn't remembered for next set (which would lead to empty blocks).
    blockgap = 300; //this is the number of itterations the block will reccur after in the first level.

    //To make default motion of the snake free.
    for(int i=0; i<=9; i++)  {
        b[i] = 1;
    }
}

void SnakevsBlock::reset()
{
    SnakevsBlock::object_initialisations();
    //This prepares the game for the next level by reseting certain variables.
    _dropbuff = 0;
    if(blockgap >= 60) {
        blockgap -= 10;   //to make progressive levels harder by making the blocks drop more frequently.
    }
    //To make default motion of the snake free.
    for(int i=0; i<=9; i++)  {
        b[i] = 1;
    }
}

void SnakevsBlock::object_initialisations()
{
    _l.init(); //length calc object initialisation.
    _s.init(3,1); //snake object initialisation.
    _f.init(); //food 1 object initialisation.
    _ff.init(); //food 2 object initialisation.
    _fff.init(); //food 3 object initialisation.
    _b.init(); //block object initialisation.
}

void SnakevsBlock::read_input(Gamepad &pad, FXOS8700CQ &device, int g_mode)
{
    SnakevsBlock::calculateTilt(pad, device);

    switch (g_mode) {
        case 1:
            _d = pad.get_direction(); //Obtains Direction pushed towards on Joystick.
            break;
        case 2:
            if (_tiltAngle >= 6) {
                _d = E;
            } else if (_tiltAngle <= -6) {
                _d = W;
            } else {
                _d = CENTRE;
            }
            break;
    }
    SnakevsBlock::lightTheLEDS(pad); //This function ligths the LEDS dependent on the direction of travel.
    //printf("%d",gm);
    //printf("%f",_tiltAngle);
    //printf("%f",device.get_roll_angle());
}

void SnakevsBlock::calculateTilt(Gamepad &pad, FXOS8700CQ &device) //this just reads the angle of tilt required for motion contol and also resets it if A is pressed.
{
    device.get_values();
    _tiltAngle = -device.get_roll_angle();
    //if button A is pressed then reset that particular position to center
    if (pad.check_event(Gamepad::A_PRESSED) == true)  {
        garbage = _tiltAngle;
    }
    _tiltAngle = -device.get_roll_angle() - garbage;

    //device.get_values();
    //printf("%f",_tiltAngle);
    //printf("%f",device.get_roll_angle());
}

void SnakevsBlock::lightTheLEDS(Gamepad &pad) //This function ligths the LEDS dependent on the direction of travel.
{
    if (_d == E)  {
        for(int led = 4; led <= 6; led++) {
            pad.led(led,1);
        }
    } else if (_d == W)  {
        for(int led = 1; led <= 3; led++) {
            pad.led(led,1);
        }
    } else {
        for(int led = 1; led <= 6; led++) {
            pad.led(led,0);
        }
    }
}

void SnakevsBlock::draw(N5110 &lcd, Gamepad &pad)
{
    _length = _l._getLength(); //saves the snake length into a private variable.
    SnakevsBlock::makeVirtualLengthMaxTen(); //stops the length at 10 for collision and drawing purposes.
    _s.draw(lcd, _virtualLength); //Draws the Snake.
    if(_dropbuff >= 0)  {
        _f.draw(lcd); //Draws the first food after a loop delay of 0.
    }
    if(_dropbuff >= 50)  {
        _ff.draw(lcd); //Draws the first food after a loop delay of 50.
    }
    if(_dropbuff >= 80) {
        _fff.draw(lcd); //Draws the first food after a loop delay of 80.
    }
    _dropbuff +=1;
    if(_dropbuff >= 8) {
        _b.draw(lcd, _length);
    }
    //Code to print length on game screen.
    _l.print_length_on_screen(lcd);
}

void SnakevsBlock::update(N5110 &lcd, Gamepad &pad) //Updates objects on screen.
{
    SnakevsBlock::MakeDefaultMotionFree(); //this makes the default motion of the snake freemoving before a collision is checked for, to forget the previous collision.
    send_block_number = 0;  //this is for the game to decide wether to send the number on the block for the current itteration to the blaocks class.
    //we dont need to remember if it has already gone past the screen. The saved number in this changes if the snake collides with the block in CheckSnakeBlockCollision.
    SnakevsBlock::CheckSnakeFoodCollision(pad); //Function checks for when the snake collides with it's food.
    SnakevsBlock::CheckSnakeBlockCollision(pad); //Function checks for when the snake collides with any of the blocks.
    SnakevsBlock::CheckSnakeBlockSidesCollision(pad); //Function checks for when the snake collides with any of the blocks' sides.
    _s.update(_d, b); //_d is the direction of joystick and b controls the motion of a section of the snake relative to obstruction
    _f.update();
    _ff.update();
    _fff.update();
    _b.update(blocknum, blockgap, srn, send_block_number);

}

int SnakevsBlock::CheckGameProgression(N5110 &lcd, Gamepad &pad, SDFileSystem &sd)
{
    //Function handles level progression and level failure operations by using the class WinLoose.
    if(_length == 0)  {
        _wl.GameOver(lcd,pad);
    }
    if((pad.check_event(Gamepad::BACK_PRESSED))||(_length == 0)) { //Waits for Back button to be pressed or the length to reach 0.
        back = 1;
        SnakevsBlock::init();
    } else {
        back = 0;
    }
    //printf("%d\n",_length);
    if(_length >= _maxLength)  {
        _maxLength++;
        level = _wl.LevelComplete(lcd, pad, level);
        _Setstats.write(level, sd);
        //_statset.read(sd); //to read the currently stored value.
        SnakevsBlock::reset(); //reset prepares the game for the next level.
    }
    //_statset.read(sd); //to read the currently stored value.
    return back;
}

void SnakevsBlock::get_pos()
{
    //printf("player pos = %f %f \n", player_pos.x, player_pos.y); //top left of player sprite
    // 81.000000 0.000000 top right
    // 0.000000 0.000000 is top left
    // 81.000000 45.000000 bottom right
    snakex = _s.get_pos(0).x; //this could be snake_pos[0].x or simply snake_pos[0] to represent both x&y but as it is used the most, it improves readability.
    snakey = _s.get_pos(0).y; //this could be snake_pos[0].y or simply snake_pos[0] to represent both x&y but as it is used the most, it improves readability.
    //printf("snakexy in GAME = %d %d \n", snakex, snakey);
    //Obtains all required coordinates.
    food_pos[0] = _f.get_pos();
    food_pos[1] = _ff.get_pos();
    food_pos[2] = _fff.get_pos();
    //obtains origin cordinates of block.
    b_pos = _b.get_pos();
    //this saves the positions of each snake beed (the first to the last) in a single array. Element[0] is the top beed and soo on.
    for(int i = 0; i <= 9; i++)  {
        snake_pos[i] = _s.get_pos(i); //gets the position of the each beed from the snake class and saves in array.
    }
}


void SnakevsBlock::CheckSnakeFoodCollision(Gamepad &pad)
{
    //If statements check if the snake sprite has collided with any
    //of the three food sprites, if so then the food location is reset and
    //length of the snake is increased using the length variable.

    SnakevsBlock::CheckSnakeFoodYCollision(pad);

    _f.set_pos(food_pos[0]);
    _ff.set_pos(food_pos[1]);
    _fff.set_pos(food_pos[2]);
}

void SnakevsBlock::CheckSnakeFoodYCollision(Gamepad &pad)
{
    for(int y=0; y<=2; y++)  {  //this loop automatically creates each coordinate of collision in the y postion that will be used in ImplementSnakeFoodCollision(pad, x, y).
        SnakevsBlock::CheckSnakeFoodXCollision(pad, y);
    }

}

void SnakevsBlock::CheckSnakeFoodXCollision(Gamepad &pad, int y)
{

    for(int x=0; x<=2; x++)  {  //this loop automatically creates each coordinate of collision in the x postion that will be used in ImplementSnakeFoodCollision(pad, x, y).
        SnakevsBlock::ImplementSnakeFoodCollision(pad, x, y);
    }

}

void SnakevsBlock::ImplementSnakeFoodCollision(Gamepad &pad, int x, int y)
{
    for(int food_sr=0; food_sr<=2; food_sr++)  {    //this loop automatically detects which food we are interacting with.
        if (
            ((snakey + y == food_pos[food_sr].y) ||
             (snakey + y == food_pos[food_sr].y + 1) ||
             (snakey + y == food_pos[food_sr].y + 2)) &&
            ((snakex + x == food_pos[food_sr].x) ||
             (snakex + x == food_pos[food_sr].x + 1) ||
             (snakex + x == food_pos[food_sr].x + 2))
        ) {
            //printf("snake feast working \n");
            //audio feedback
            pad.tone(786.0,0.1);
            food_pos[food_sr].x = (rand() % 82);  //this makes the food pop up at a random, unspecified location in the x axis.
            food_pos[food_sr].y = -3;
            _l.PlusLength();
        }
    }

}

void SnakevsBlock::CheckSnakeBlockCollision(Gamepad &pad)
{
    //Obtains the numbers inside the block.
    b_number = _b.get_number();
    //If statements check if the snake sprite has collided with any
    //of the blocks which are a maximum of 5, if so then the snake length reduces and the block number reduces
    //the block has to move slower and come down after every 2/3 iterations(dependent on the snake size.(think about this)
    for(int block=0; block<=83; block+=1)  {    //this loop automatically detects for each section of block and each combination of collision
        if (((snakey == b_pos.y + 11)||
                (snakey == b_pos.y + 10)||
                (snakey == b_pos.y + 9)||
                (snakey == b_pos.y + 8))&&
                (snakex + 1 == b_pos.x + block))  {
            //the or for the block's y position is due to the fact the exact y co-ordinate might not be collided if the snake's length has increased in the same itteration.
            //printf("snake collision working \n");
            //audio feedback
            srn = CheckBlock(block);  //this tells us which of the 5 blocks we are colliding with
            blocknum = b_number[srn]; //this saves the number inside the colliding block into blocknum.
            ImplementSnakeBlockCollision(pad); //this implements the collision once the conditions are met.
            SnakevsBlock::_setVelocity(srn); //sets the block and foods free or frezes them depending on snake length.
        }
    }
}

void SnakevsBlock::_setVelocity(int srn)
{
    if((_length>=10)&&(b_number[srn]>0)) { //this makes the block stop moving down if it's length is more than 10 and still collides.
        velocity = 0; //the block and food have to stop as if length of snake is 15 and it reaches 10 one by one, it stays at the same place, as max virtual length
    } else {          //is 10.
        velocity = 1;
    }
    _b.velocity.y = velocity;
    _f.velocity.y = velocity;
    _ff.velocity.y = velocity;
    _fff.velocity.y = velocity;
}

int SnakevsBlock::CheckBlock(int block)
{
    int srn;
    if((block>=0)&&(block<=18))  {
        srn = 0;
    }
    if((block>=19)&&(block<=34))  {
        srn = 1;
    }
    if((block>=35)&&(block<=50))  {
        srn = 2;
    }
    if((block>=51)&&(block<=66))  {
        srn = 3;
    }
    if((block>=67)&&(block<=83))  {
        srn = 4;
    }
    return srn;
}

void SnakevsBlock::ImplementSnakeBlockCollision(Gamepad &pad)
{
    send_block_number = 1;
    if(blocknum > 0)  {  // to make sure that snake doesn't decrease in _length if number on the block is less than 1;
        _l.MinusLength();
        pad.tone(432.0,0.1);
        wait(0.04);
    }
    blocknum-=1;
}

void SnakevsBlock::CheckSnakeBlockSidesCollision(Gamepad &pad)
{
    //If statements check if the snake sprite has collided with any
    //of the blocks' sides and then stop the snake moving in x axis

    for(int i=0; i<=9; i++)  { //i checks for all possible collisions with the snake respective to it's length.
        SnakevsBlock::CheckSnakeBlockSidesYCollision(i); //checks if the snake and the block are at the same position in y axis.
    }

}

void SnakevsBlock::MakeDefaultMotionFree()  //this makes the default motion of the snake freemoving before a collision is checked for, to forget the previous collision.
{
    for(int i=0; i<=9; i++)  {
        b[i] = 1;
    }
}

void SnakevsBlock::CheckSnakeBlockSidesYCollision(int i)  //i is the index of the snake beed and checks for all possible collisions with the snake respective to it's length.
{
    //This code checks if the snake and the block overlap in the Y axis.
    for(int b_y_combination=0; b_y_combination<=10; b_y_combination++)  { //this carries out the next stage if the Y axis collision criterion is met.
        if (
            (snake_pos[i].y == b_pos.y + b_y_combination) ||
            (snake_pos[i].y + 1 == b_pos.y + b_y_combination) ||
            (snake_pos[i].y + 2 == b_pos.y + b_y_combination))  {

            SnakevsBlock::CheckSnakeBlockSidesXCollision(i); //checks if the snake and the block are at the same position in x axis.

        }
    }
}

void SnakevsBlock::CheckSnakeBlockSidesXCollision(int i)  //i is the index of the snake beed and checks for all possible collisions with the snake respective to it's length.
{
    for(int b_x_combination=2; b_x_combination<=82; b_x_combination+=16)  { //this carries out the next stage if the X axis collision criterion is met.

        SnakevsBlock::CheckSnakeBlockSidesEastWestCollision(b_x_combination, i); //checks if the colliding wall is on east side or west side.
    }
}

void SnakevsBlock::CheckSnakeBlockSidesEastWestCollision(int b_x_combination, int i) //i checks for all possible collisions with the snake respective to it's length.
{
    //For West side of walls
    if(
        ((snake_pos[i].x == b_x_combination + 2) ||  //W
         (snake_pos[i].x + 1 == b_x_combination + 2))&&(_d != E)&&(_virtualLength > i) //W
    ) {
        SnakevsBlock::ImplementSnakeBlockSidesCollision(i);
    }
    //for East side of walls
    else if (
        ((snake_pos[i].x + 1 == b_x_combination) ||  //E
         (snake_pos[i].x + 2 == b_x_combination))&&(_d != W)&&(_virtualLength > i) //E
    ) {
        SnakevsBlock::ImplementSnakeBlockSidesCollision(i);
    }
}

void SnakevsBlock::makeVirtualLengthMaxTen()
{
    //this makes the virtual length -> 10 for the side collision implementation because if the length is fifteen and the last beed collides, it still is the 10th beed
    //on screen.
    _virtualLength = _length;
    if(_length >= 10) {
        _virtualLength = 10;   //to stop the snake length virtually at 10 when it goes past it.
    }
}

void SnakevsBlock::ImplementSnakeBlockSidesCollision(int i) //i is the index of the snake beed and checks for all possible collisions with the snake respective to it's length.
{
    //code makes sure that the colliding part doesn't move in x axis.
    for(int snake_beed_num=0; snake_beed_num<=10; snake_beed_num++)  {
        if(_virtualLength == snake_beed_num + i)  {
            b[snake_beed_num - 1] = 0;
        }
    }
}