File content as of revision 11:adb68da98262:

#include "Game.h"

Serial pc(USBTX, USBRX); // TO DELETE - DEBUGGING ONLY

void Game::init()
{
    // Player
    player.x = 40;
    player.y = 5; 
    player.width = player.height = 5;
    onGround = false;
}

// Functions
void Game::update(float dt)
{
    // Handle input, should be its own function
    switch(input->joystick->getDirection())
    {
        case LEFT:
        case UP_LEFT:
        case DOWN_LEFT:
            player.vx = -2;
            player.facingLeft = true;
        break;
        
        case RIGHT:
        case UP_RIGHT:
        case DOWN_RIGHT:
            player.vx = 2;
            player.facingLeft = false;
        break;
        
        
        case UP:
            //player.vy = -4;
        break;
        case DOWN:
            player.vy += 1;
        break;
        
        case CENTER:
            player.vx = 0;
        break;
    }
    
    // Ground, temporary solution, to be fixed with real map
    player.vy += 1;
    
    // Check if player is trying to jump. Player can only jump if it's on the ground
    if (input->read(Input::ButtonA) && onGround)
    {
        player.vy = -4;
        onGround = false;
    }
    
    // Terminal velocity 3 px/update
    if (player.vy > 3) player.vy = 3;
    
    // Update player position - should be done step wise! TODO!!
    
    // Find direction of player
    
    // Collision player with map
    
    int x = player.x;
    int y = player.y;
    int steps = abs(player.vx); // how many units (pixels) the player should move in said direction
    bool collision; // true if colliding
    
    // Check x-axis
    if (player.vx > 0) // moving right
    {
        int playerRight = x + player.width - 1; // Need to check right border of player, since it is moving right
        
        while(steps--) // While it still have more movement left
        {
            collision = false;
            for (int i = 0; i < player.height; ++i) // Loop through all vertical points on the right hand side of the player (y+i)
            {
                if (map[y+i][playerRight+1]) // If moving to the right leads to collision for given y+i
                {
                    collision = true; // Then collision is true
                    break;            // Skip the for loop, no need for further testing
                }
            }
            
            if (collision) // If collision
                break;     // skip the while loop, player can not move further, even though its velocity is higher
            else
                ++playerRight;  // Move player one px to the right
        }
        
        player.x = playerRight - (player.width - 1); // Update player's position. Need to set upper-left pixel.
    }
    else // moving left
    {
        while(steps--) // While still movement left
        {
            collision = false;
            
            
            for (int i = 0; i < player.height; ++i) // Check for all y-positions
            {
                if (map[y+i][x-1])                  // If solid block
                {
                    collision = true;
                    break;                          // Collision detected, no further testing required
                }
            }
            
            if (collision)
                break;
            else
                --x;    // Move to the left if no collision is detected
        }
        
        player.x = x;
    }
    
    // Check collision with map in y-direction - works the same way as the x-axis, except for other axis
    
    x = player.x;
    y = player.y;
    steps = abs(player.vy);
    
    if (player.vy > 0) // downwards
    {
        int playerBottom = y + player.height - 1; // Need to check if bottom part collides
        while(steps--)  // Still movement left
        {
            collision = false;
            for (int i = 0; i < player.width; ++i)  // Loop through all x-position on lower part of player
            {
                if (map[playerBottom+1][x+i])       // If moving the player one step down for a given (x+i)-position gives a collision
                {
                    collision = true;
                    break;                          // No further testing required
                }
            }
            
            if (collision)                          // If collision
            {
                player.vy = 0;                      // Set vertical velocity to 0 (playe
                onGround = true;                    // Player has hit ground
                break;                              // Skip the while loop as the player can not move further downwards
            }
            else                // Can safely move player without collision
                ++playerBottom; // Move player one step down
        }
        
        player.y = playerBottom - (player.height - 1);      // Update position when done moving, remember that player.y refers to upper part of the player
    }
    else // moving up, check collision from top
    {
        while(steps--)  // Still movement left
        {
            collision = false;
            
            for (int i = 0; i < player.width; ++i) // Check for all x-positions
            {
                if (map[y-1][x+i])                  // If moving upwards gives collision for a given x+i
                {
                    collision = true;               // Then we have a collision
                    break;                          // No further testing needed, skip for loop
                }
            }
            
            if (collision)  // If collision was detected
            {
                player.vy = 0;  // Set vertical velocity to zero
                break;          // Skip while loop as player can not move further up
            }
            else            // If safe to move for all x-values
                --y;        // Move player one step up
        }
        
        player.y = y;       // Update vertical position of player
    }    
    
    // Check if bullet should be fired
    if (input->read(Input::ButtonB) && releasedBtnB)
    {
        // Create a new bullet and give it initial values
        Point* bullet = new Point;
        bullet->x = (player.facingLeft) ? (player.x-1) : (player.x + player.width);
        bullet->y = player.y + 2;
        bullet->vx = (player.facingLeft) ? -4 : 4;
        bullet->vy = 0;
        
        bullets.push_back(bullet);
        releasedBtnB = false;
    }
    else if (!input->read(Input::ButtonB))
        releasedBtnB = true;
    
    // Loop through bullets and move them
    for (std::vector<Point*>::iterator it = bullets.begin(); it != bullets.end();)
    {
        (*it)->x += (*it)->vx;
        
        // Check if outside
        int x = (*it)->x;
        if (x < 0 || x > WIDTH)
        {
            delete (*it);
            it = bullets.erase(it); // go to next element
        }
        else
            ++it;   // go to next element
        
        // TODO: Check for collisions
        // TODO: Go both ways
    }
}

void Game::render()
{
    // Draw map
    drawImage(map);
    
    // Draw player - TODO: Make this a part of sprite class (so they can draw themselves)
    int x0, x1, y0, y1;
    x0 = (player.x < 0) ? 0 : player.x;                       // x0 = max(0,x);
    y0 = (player.y < 0) ? 0 : player.y;                       // y0 = max(0,y);
    x1 = (player.width + player.x > WIDTH) ? WIDTH : player.width + player.x;       //x1 = min(WIDTH, width);
    y1 = (player.height + player.y > HEIGHT) ? HEIGHT : player.height + player.y;   //y1 = min(HEIGHT, height);
    
    for (int i = y0; i < y1; ++i)
    {   
        for (int j = x0; j < x1; ++j)
        {
            // If player is going right, obtain data from sprite in reverse order => render in reverse
            int xIndex = (player.facingLeft) ? (j-x0) : (player.width - 1 - (j-x0));
            
            if (Image::Player[i-y0][xIndex])
                lcd->setPixel(j,i);
        }
    }
    
    // Render bullets
    for (std::vector<Point*>::iterator it = bullets.begin(); it != bullets.end(); ++it)
    {
        int x, y;
        x = (*it)->x;
        y = (*it)->y;
        
        if (x >= 0 && x < WIDTH && y >= 0 && y < HEIGHT) // Boundary check
            lcd->setPixel(x,y);
    }
}