ELEC2645 (2019/20)
Helios Lyons 201239214
Dependencies: mbed
Brief
My aim for this project was to create a FRDM K64F adapted version of the classic Space Invaders by Tomohiro Nishikado. The game itself has a number of clear features to implement;
- Left to right movement for the player 'canon'
- A fixed amount of player lives
- Firing mechanics for both canon and invaders (hence collision systems)
- Random firing from remaining invaders
- Wave based combat
My own addition to these established ideas was Boss waves, featuring a single, larger sprite which fires at a faster interval than previous waves. The addition of a movement system using a basic for loop, as opposed to a velocity based system, will enhance the nostalgic feel of the game.
Gameplay
Movement is controlled with the joystick, moving the canon left or right. Fire by pressing A. Invaders spawn at set positions, but randomly fire at a set interval, which is higher for boss waves. Time is taken during each wave, and displayed at wave intervals, and if the play wins.
Controls are shown on the Gamepad below: (attribution: Craig A. Evans, ELEC2645 University of Leeds)
main.cpp
- Committer:
- helioslyons
- Date:
- 2020-05-27
- Revision:
- 11:1fd8fca23375
- Parent:
- 10:19b250c7de5e
- Child:
- 13:1472c1637bfc
File content as of revision 11:1fd8fca23375:
/*
ELEC2645 Embedded Systems Project
School of Electronic & Electrical Engineering
University of Leeds
2019/20
Name: Helios Ael Lyons
Username: mc18hal
Student ID Number: 201239214
Date: 24th March 2020
*/
/** Main
* @brief Start screen, menu, and game loop
* @author Helios A. Lyons
* @date March, 2020
*/
///////// pre-processor directives ////////
#include "mbed.h"
#include "Gamepad.h"
#include "N5110.h"
#include "Bitmap.h"
#include "Battle.h"
// structs
struct UserInput {
Direction d;
float mag;
};
// objects
N5110 lcd;
Gamepad pad;
Battle battle;
Canon player;
Timer playTime;
// prototypes
void init();
void update_game(UserInput input);
void render();
void welcome();
void wave(int n);
void game(Gamepad &pad);
void menu(Gamepad &pad);
// functions
int main()
{
//lcd.clear();
init(); // initialise LCD and gamepad
welcome(); // display welcome screen
Menu_Point: // goto point after victory/defeat
menu(pad);
battle.reset_life(); // start player lives at 3
int n = 0;
while (n < 9) {
n++;
if (battle.life() < 1) { break; } // break condition for when player dies
switch(n) {
case 1: // initialise entities for the wave
battle.init(1,3,4,3,0,3); // row,column,speed,firing interval,boss,bossNum
battle.clock(pad); // start the invader firing pattern
wave(n); // print wave #
playTime.start(); // start timer before game starts
game(pad); // start the main game loop
playTime.stop(); // stop timer
break;
case 2:
battle.init(3,3,4,3,0,3); // init function is used this way to provide
battle.clock(pad); // easy options to vary invader formation and number
wave(n); // in wave
playTime.start();
game(pad);
playTime.stop();
break;
case 3:
battle.init(1,1,3,2,1,1);
battle.clock(pad);
wave(n);
playTime.start();
game(pad);
playTime.stop();
break;
case 4:
battle.init(2,3,3,3,0,1);
battle.clock(pad);
wave(n);
playTime.start();
game(pad);
playTime.stop();
break;
case 5:
battle.init(3,3,3,3,0,1);
battle.clock(pad);
wave(n);
playTime.start();
game(pad);
playTime.stop();
break;
case 6:
battle.init(1,1,2,1,1,2);
battle.clock(pad);
wave(n);
playTime.start();
game(pad);
playTime.stop();
break;
case 7:
battle.init(3,4,2,3,0,2);
battle.clock(pad);
wave(n);
playTime.start();
game(pad);
playTime.stop();
break;
case 8:
battle.init(3,6,3,2,0,2);
battle.clock(pad);
wave(n);
playTime.start();
game(pad);
playTime.stop();
break;
case 9:
battle.init(1,1,1,1,1,3);
battle.clock(pad);
wave(n);
playTime.start();
game(pad);
playTime.stop();
break;
} // end of switch statement
}
if (battle.life() < 1) { // if player failed display game over
lcd.printString("Game Over",16,2);
lcd.refresh();
wait(8.0);
goto Menu_Point; // return to main menu after wait
}
else { // if waves are completed display time and victory screen
lcd.printString("You won!",16,2);
char buffer4[14];
float time = sprintf(buffer4,"Time:%.2f",playTime.read());
lcd.printString(buffer4,16,3);
lcd.refresh();
wait(8.0);
goto Menu_Point; // return to main menu
}
}
void init() // initialises LCD and Gamepad
{
lcd.init();
pad.init();
}
void render() { // clears screen and re-draws content (+ current lives left)
lcd.clear(); // called in the main game() loop
battle.draw(lcd);
lcd.refresh();
char buffer[4];
int lives = sprintf(buffer,"%2d",battle.life());
lcd.printString(buffer,0,5);
lcd.refresh();
}
void game(Gamepad &pad) { // main game loop, reads input and updates bullet / canon positions
while (1) {
int fps = 6;
battle.read_input(pad);
battle.update(pad);
render();
wait(1.0f/fps);
if (battle.end() || battle.life() < 1 ) { break; }
}
lcd.clear();
}
void wave(int n) { // prints wave number and time taken so far
lcd.clear();
char buffer[14];
char buffer3[3];
int number = sprintf(buffer,"Wave%2d",n);
float time = sprintf(buffer3,"%.2f",playTime.read());
lcd.printString(buffer,24,1);
lcd.printString(buffer3,27,2);
lcd.refresh();
wait(3.0);
}
void welcome() { // bitmap logo and title for start screen
static int logo[] = {
0,0,0,0,1,1,0,0,0,0,0,0,0,0,0,0,1,1,0,0,0,0,
0,0,0,0,1,1,0,0,0,0,0,0,0,0,0,0,1,1,0,0,0,0,
0,0,0,0,0,0,1,1,0,0,0,0,0,0,1,1,0,0,0,0,0,0,
0,0,0,0,0,0,1,1,0,0,0,0,0,0,1,1,0,0,0,0,0,0,
0,0,0,0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,0,0,0,0,
0,0,0,0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,0,0,0,0,
0,0,1,1,1,1,0,0,1,1,1,1,1,1,0,0,1,1,1,1,0,0,
0,0,1,1,1,1,0,0,1,1,1,1,1,1,0,0,1,1,1,1,0,0,
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
1,1,0,0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,0,0,1,1,
1,1,0,0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,0,0,1,1,
1,1,0,0,1,1,0,0,0,0,0,0,0,0,0,0,1,1,0,0,1,1,
1,1,0,0,1,1,0,0,0,0,0,0,0,0,0,0,1,1,0,0,1,1,
0,0,0,0,0,0,1,1,1,1,1,1,1,1,1,1,0,0,0,0,0,0,
0,0,0,0,0,0,1,1,1,1,1,1,1,1,1,1,0,0,0,0,0,0
};
Bitmap canon_sprite(logo, 16, 22);
canon_sprite.render(lcd,30,4);
lcd.printString("Space Invaders",0,3);
lcd.printString("Press Start",8,4);
lcd.refresh();
while (pad.start_pressed() == false) { // LEDs flash until start is pressed
lcd.setContrast(pad.read_pot1());
pad.leds_on();
wait(0.1);
pad.leds_off();
wait(0.1);
}
}
void menu(Gamepad &pad) {
while(1) {
pad.reset_buttons();
lcd.clear();
lcd.printString("(A) Play",0,1);
lcd.printString("(X) How To",0,2);
lcd.printString("(B) Credits",0,3);
lcd.refresh();
if (pad.X_pressed()) {
lcd.clear();
lcd.printString("Press A",0,2);
lcd.printString("to shoot",0,3);
lcd.refresh();
wait(5.0);
lcd.clear();
lcd.printString("Use the",0,1);
lcd.printString("joystick to",0,2);
lcd.printString("move left",0,3);
lcd.printString("or right",0,4);
lcd.refresh();
wait(5.0);
lcd.clear();
lcd.printString("Remaining ",0,1);
lcd.printString("lives are on",0,2);
lcd.printString("the bottom",0,3);
lcd.printString("left",0,4);
lcd.refresh();
wait(5.0);
lcd.clear();
lcd.printString("Elapsed time",0,1);
lcd.printString("is shown at",0,2);
lcd.printString("each wave",0,3);
lcd.printString("interval",0,4);
lcd.refresh();
wait(5.0);
}
else if (pad.A_pressed()) {
return;
}
else if (pad.B_pressed()) {
lcd.clear();
lcd.printString("Game by",0,2);
lcd.printString("H.A. Lyons",0,3);
lcd.refresh();
wait(5.0);
}
}
}