Ball.cpp

00001 #include "Ball.h"
00002 
00003 Ball::Ball()
00004 {
00005 
00006 }
00007 
00008 Ball::~Ball()
00009 {
00010 
00011 }
00012 
00013 void Ball::init(int size,int speed, int x)
00014 {
00015     _size = size; // size of the ball
00016 
00017     _x = x;   // init position of the ball will be at the centre of the paddle
00018     _y = HEIGHT - _size/2 - 3; // fixed y init position, just above the paddle
00019 
00020     srand(time(NULL));
00021     int direction = rand() % 2; // randomise initial direction.
00022 
00023     // 2 directions, both directed upwards (N) from the paddle
00024     if (direction == 0) {
00025         _velocity.x = speed; // direction = E
00026         _velocity.y = -speed; // direction = N
00027     } else {
00028         _velocity.x = -speed; // direction = W
00029         _velocity.y = -speed; // direction = N
00030     }
00031 }
00032 
00033 
00034 void Ball::draw(N5110 &lcd)  // draw the ball at the specified location
00035 {
00036     lcd.drawRect(_x,_y,_size,_size,FILL_BLACK);
00037 }
00038 
00039 
00040 void Ball::update()  // update the ball's position, based on its current velocity
00041 {
00042     _x += _velocity.x;
00043     _y += _velocity.y;
00044 }
00045 
00046 
00047 void Ball::set_velocity(Vector2D v) // set the velocity in its x/y directions (used for collision velocity correction)
00048 {
00049     _velocity.x = v.x;
00050     _velocity.y = v.y;
00051 }
00052 
00053 
00054 Vector2D Ball::get_velocity() // retrieve the ball's current velocities
00055 {
00056     Vector2D v = {_velocity.x,_velocity.y};
00057     return v;
00058 }
00059 
00060 
00061 Vector2D Ball::get_pos() // retrieve the ball's current coordinates
00062 {
00063     Vector2D p = {_x,_y};
00064     return p;
00065 }
00066 
00067 
00068 void Ball::set_pos(Vector2D p)  // set the ball's coordinates (used for collision velocity correction)
00069 {
00070     _x = p.x;
00071     _y = p.y;
00072 }