Ball.cpp

00001 /* 
00002 ELEC2645 Embedded Systems Project
00003 School of Electronic & Electrical Engineering
00004 University of Leeds
00005 2019/20
00006 
00007 Name:Yang Zhenye
00008 Username:el17zy
00009 Student ID Number:201199680
00010 Date:2020/5/12
00011 */
00012 
00013 #include "Ball.h"
00014 
00015 Ball::Ball()
00016 {
00017 
00018 }
00019 
00020 Ball::~Ball()
00021 {
00022 
00023 }
00024 
00025 void Ball::init(int size,int speed)
00026 {
00027     _size = size;
00028 
00029     _x = WIDTH/2 -  _size/2;
00030     _y = HEIGHT/2 - _size/2;
00031 
00032     srand(time(NULL));
00033     int direction = rand() % 4; // randomise initial direction. 
00034 
00035     // 4 possibilities. Get random modulo and set velocities accordingly
00036     if (direction == 0) {
00037         _velocity.x = speed;
00038         _velocity.y = speed;
00039     } else if (direction == 1) {
00040         _velocity.x = speed;
00041         _velocity.y = -speed;
00042     } else if (direction == 2) {
00043         _velocity.x = speed;
00044         _velocity.y = speed;
00045     } else {
00046         _velocity.x = -speed;
00047         _velocity.y = -speed;
00048     }
00049 }
00050 
00051 void Ball::draw(N5110 &lcd)
00052 {
00053     lcd.drawRect(_x,_y,_size,_size,FILL_BLACK);
00054 }
00055 
00056 void Ball::update()
00057 {
00058     _x += _velocity.x;
00059     _y += _velocity.y;
00060 }
00061 
00062 void Ball::set_velocity(Vector2D v)
00063 {
00064     _velocity.x = v.x;
00065     _velocity.y = v.y;
00066 }
00067 
00068 Vector2D Ball::get_velocity()
00069 {
00070     Vector2D v = {_velocity.x,_velocity.y};
00071     return v;
00072 }
00073 
00074 Vector2D Ball::get_pos()
00075 {
00076     Vector2D p = {_x,_y};
00077     return p;
00078 }
00079 
00080 void Ball::set_pos(Vector2D p)
00081 {
00082     _x = p.x;
00083     _y = p.y;
00084 }