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//
// Example of an entity system
//
const MAX_ENTS number = 10;
const UNUSED number = 0;
const QUEUED number = 1;
const ACTIVE number = 2;
const PLAYER number = 0;
const ENEMY number = 1;
const ITEM number = 2;
def Entity {
var id number;
var used number;
var type number;
var x number;
var y number;
var frame number;
var delay number;
var lives number;
var score number;
def update() {
println("updating player");
}
def erase() {
println(id, " -> erase x:", x, " y:", y, " f:", frame);
}
def draw() {
println(id, " -> read bg x:", x, " y:", y);
println(id, " -> blit x:", x, " y:", y, " f:", frame);
}
def destroy() {
used = UNUSED;
}
def test(other Entity) bool {
// TODO
return false;
}
def enemyUpdate() {
println(id, " -> updating enemy ", used);
}
def enemy() {
type = ENEMY;
update = enemyUpdate;
}
}
def Game {
var ents [10]Entity;
var next number;
def spawn(x number, y number) Entity {
var start number = next;
for {
if !ents[next].used {
ents[next].used = QUEUED;
ents[next].x = x;
ents[next].y = y;
ents[next].frame = 0;
ents[next].delay = 0;
ents[next].id = next;
return ents[next];
}
next = (next + 1) % MAX_ENTS;
if next == start {
panic("out of ents :(");
}
}
}
var player Entity = spawn(1, 1);
def erase() {
for e in ents {
if e.used == ACTIVE {
e.erase();
}
}
}
def draw() {
for e in ents {
if e.used == ACTIVE {
e.draw();
}
}
}
def update() {
for e in ents {
if e.used == ACTIVE {
e.update();
if e.type != PLAYER && e.test(player) {
if e.type == ENEMY {
player.lives = player.lives - 1;
continue;
}
if e.type == ITEM {
player.score = player.score + 10;
e.destroy();
continue;
}
}
continue;
}
if e.used == QUEUED {
e.used = ACTIVE;
}
}
}
def run() {
var loops number;
for loops < 10 {
erase();
update();
draw();
// buffer SWAP
if player.lives == 0 {
println("game over");
break;
}
loops = loops + 1;
}
if loops == 10 {
println("out of rounds");
}
}
}
var game Game;
game.player.lives = 10;
game.spawn(1, 2).enemy();
game.spawn(2, 2).enemy();
game.spawn(2, 2).enemy();
game.spawn(2, 2).enemy();
game.run();
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