Initial import

1 files changed, 535 insertions, 0 deletions

diff --git a/js/mygame.js b/js/mygame.js
new file mode 100644
index 0000000..e4453ff
--- /dev/null
+++ b/js/mygame.js
@@ -0,0 +1,535 @@
+const CANVAS_SIZE = { w: 160, h: 160 };
+const FONT_SIZE = { w: 8, h: 8};
+const SCORE_W = 6;
+
+const DIR_RIGHT = 0;
+const DIR_LEFT = 1;
+const WALK_FRAMES = [ 0, 1, 0, 2 ];
+const FDELAY = 8;
+
+const F_UP = 0;
+const F_DOWN = 1;
+const F_RIGHT = 2;
+const F_LEFT = 3;
+
+const COOLDOWN = 10;
+
+const SPAWN_EFFECT_DELAY = 32;
+
+const DAMAGE_SND_DELAY = 16;
+
+const MAX_LIFE = 20;
+
+const WAVES = [
+    { delay: 128, count: 8 },
+    { delay: 100, count: 8 },
+    { delay: 80, count: 16 },
+    { delay: 60, count: 32 },
+    { delay: 50, count: 64 },
+    { delay: 40, count: 64 },
+    { delay: 20, count: 96 },
+    { delay: 15, count: 96 }
+];
+
+function mkCanvasText(font, text) {
+    let c = document.createElement("canvas");
+    c.width = text.length * FONT_SIZE.w;
+    c.height = FONT_SIZE.h;
+    let ctx = c.getContext("2d");
+
+    ctx.clearRect(0, 0, c.width, c.height);
+    for(let i = 0; i < text.length; i++) {
+        /* our font starts with space, that's ascii 32 */
+        let index = text.charCodeAt(i) - 32;
+        ctx.drawImage(font,
+            0, index * FONT_SIZE.h, FONT_SIZE.w, FONT_SIZE.h,
+            i * FONT_SIZE.w, 0, FONT_SIZE.w, FONT_SIZE.h);
+    }
+    return c;
+}
+
+
+class Entity {
+    constructor() {
+        this.alive = true;
+        this.x = 0;
+        this.y = 0;
+        this.size = { w: 0, h: 0, r: 0 };
+    }
+
+    collisionWith(other) {
+        let x = (other.x + other.size.w/2) - (this.x + this.size.w/2),
+            y = (other.y + other.size.h/2) - (this.y + this.size.h/2),
+            r = this.size.r + other.size.r;
+        if (x*x + y*y <= r*r) {
+            return true;
+        }
+        return false;
+    }
+}
+
+class Enemy extends Entity {
+    constructor() {
+        super();
+    }
+}
+
+class Slime extends Enemy {
+    constructor(x, y, sprites, target) {
+        super();
+        this.size = { w: 16, h: 16, r: 8 };
+        this.x = x;
+        this.y = y;
+        this.target = target;
+        this.sprites = sprites;
+        this.frame = 0;
+        this.fdelay = 0;
+    }
+
+    update(dt) {
+        this.fdelay++
+
+        if (this.fdelay & 1) {
+            let ix = 0, iy = 0;
+            let t = this.target();
+            if (t.is_alive) {
+                if (this.x > t.x) {
+                    ix--;
+                } else if (this.x < t.x) {
+                    ix++;
+                }
+
+                if (this.y > t.y) {
+                    iy--;
+                } else if (this.y < t.y) {
+                    iy++;
+                }
+
+                this.x += ix;
+                this.y += iy;
+            }
+        }
+
+        if (this.fdelay == FDELAY) {
+            this.fdelay = 0;
+            this.frame++;
+            if (this.frame == 3) {
+                this.frame = 0;
+            }
+        }
+    }
+
+    draw(ctx) {
+        ctx.drawImage(
+            this.sprites,
+            this.frame * this.size.w, 0, this.size.w, this.size.w,
+            this.x, this.y, this.size.w, this.size.h);
+    }
+}
+
+class Spawn extends Entity {
+    constructor(x, y, enemy, spawn) {
+        super();
+        this.x = x;
+        this.y = y;
+        this.fdelay = SPAWN_EFFECT_DELAY;
+        this.delay = 0;
+        this.enemy = enemy;
+        this.spawn = spawn;
+    }
+
+    update(dt) {
+        this.delay++;
+        if (this.delay == this.fdelay) {
+            this.spawn(this.enemy);
+            this.alive = false;
+        }
+    }
+
+    draw(ctx) {
+        ctx.beginPath();
+        ctx.arc(this.x, this.y, 1 + this.fdelay - this.delay, 0, 2 * Math.PI);
+        ctx.strokeStyle = `rgba(255, 255, 255, ${this.delay / (this.fdelay * 2)})`;
+        ctx.stroke();
+    }
+}
+
+class Explo extends Entity {
+    constructor(x, y, sprites) {
+        super();
+        this.size = { w: 16, h: 16 };
+        this.x = x;
+        this.y = y;
+        this.sprites = sprites;
+        this.frame = 0;
+        this.fdelay = 0;
+    }
+
+    update(dt) {
+        this.fdelay++;
+        if (this.fdelay == FDELAY)
+        {
+            this.fdelay = 0;
+            this.frame++;
+            if (this.frame == 4) {
+                this.alive = false;
+            }
+        }
+    }
+
+    draw(ctx) {
+        ctx.drawImage(
+            this.sprites,
+            this.frame * this.size.w, 0, this.size.w, this.size.w,
+            this.x, this.y, this.size.w, this.size.h);
+    }
+}
+
+class Bullet extends Entity {
+    constructor(x, y, sprites, dir) {
+        super();
+        this.size = { w: 16, h: 16, r: 2 };
+        this.x = x;
+        this.y = y;
+        this.dir = dir;
+        this.sprites = sprites;
+    }
+
+    update(dt) {
+        switch (this.dir) {
+            case F_UP:
+                this.y -= 2;
+                break;
+            case F_DOWN:
+                this.y += 2;
+                break;
+            case F_RIGHT:
+                this.x += 2;
+                break;
+            case F_LEFT:
+                this.x -= 2;
+                break;
+        }
+
+        if (this.x < 0 || this.x > CANVAS_SIZE.w - this.size.w
+            || this.y < 0 || this.y > CANVAS_SIZE.h - this.size.h) {
+            this.alive = false;
+        }
+    }
+
+    draw(ctx) {
+        ctx.drawImage(
+            this.sprites,
+            this.dir * this.size.w, 0, this.size.w, this.size.w,
+            this.x, this.y, this.size.w, this.size.h);
+    }
+}
+
+class Player extends Entity {
+    constructor(x, y, sprites, ctl, add_bullet) {
+        super();
+        this.size = { w: 16, h: 16, frames: 3, r: 8 };
+        this.x = x;
+        this.y = y;
+        this.sprites = sprites;
+        this.ctl = ctl;
+        this.dir = DIR_RIGHT;
+        this.frame = 0;
+        this.fdelay = 0;
+        this.cooldown = 0;
+        this.add_bullet = add_bullet;
+        this.life = MAX_LIFE;
+    }
+
+    is_alive() {
+        return this.life != 0;
+    }
+
+    is_fire(d) {
+        const all = ["f_up", "f_down", "f_right", "f_left"];
+        return this.ctl[d] && !all.filter((e) => e != d).some((e) => this.ctl[e]);
+    }
+
+    update(dt) {
+        let ix = 0, iy = 0, walking = false;
+        if (this.ctl["up"]) {
+            if (this.y > 0) {
+                iy--;
+            }
+            walking = true;
+        }
+        if (this.ctl["down"]) {
+            if (this.y < CANVAS_SIZE.h - this.size.h) {
+                iy++;
+            }
+            walking = true;
+        }
+        if (this.ctl["left"]) {
+            if (this.x > 0) {
+                ix--;
+            }
+            walking = true;
+        }
+        if (this.ctl["right"]) {
+            if (this.x < CANVAS_SIZE.w - this.size.w) {
+                ix++;
+            }
+            walking = true;
+        }
+
+        if (this.cooldown) {
+            this.cooldown--;
+        } else {
+            if (this.is_fire("f_right")) {
+                this.cooldown = COOLDOWN;
+                this.add_bullet(this.x + 4, this.y + 2, F_RIGHT);
+            } else if (this.is_fire("f_left")) {
+                this.cooldown = COOLDOWN;
+                this.add_bullet(this.x - 4, this.y + 2, F_LEFT);
+            } else if (this.is_fire("f_up")) {
+                this.cooldown = COOLDOWN;
+                this.add_bullet(this.x, this.y - 2, F_UP);
+            } else if (this.is_fire("f_down")) {
+                this.cooldown = COOLDOWN;
+                this.add_bullet(this.x, this.y + 4, F_DOWN);
+            }
+        }
+
+        this.fdelay++;
+        if (this.fdelay == FDELAY)
+        {
+            this.fdelay = 0;
+            if (!walking) {
+                if (this.frame != 0) {
+                    this.frame = 0;
+                }
+            } else {
+                this.frame++;
+                if (this.frame == WALK_FRAMES.length) {
+                    this.frame = 0;
+                }
+            }
+        }
+
+        if (ix > 0)
+            this.dir = DIR_RIGHT;
+        if (ix < 0)
+            this.dir = DIR_LEFT;
+
+        this.y += iy;
+        this.x += ix;
+    }
+
+    draw(ctx) {
+        ctx.drawImage(
+            this.sprites,
+            WALK_FRAMES[this.frame] * this.size.w + this.dir * this.size.w * this.size.frames, 0, this.size.w, this.size.w,
+            this.x, this.y, this.size.w, this.size.h);
+    }
+}
+
+class MyGame extends Game {
+    constructor(canvas) {
+        super(canvas, CANVAS_SIZE.w, CANVAS_SIZE.h);
+
+        this.data = {
+            player: "img/player.png",
+            bullets: "img/bullets.png",
+            slime: "img/slime.png",
+            explo: "img/explo.png",
+            spawn_snd: "snd/spawn.ogg",
+            explo_snd: "snd/explo.ogg",
+            fire_snd: "snd/fire.ogg",
+            damage_snd: "snd/damage.ogg",
+            font: "img/font.png"
+        };
+        this.dataSize = Object.keys(this.data).length;
+
+        this.player = undefined;
+        this.enemies = [];
+        this.effects = [];
+        this.player_fire = [];
+
+        this.wave = 0;
+        this.wave_count = 0;
+        this.score = 0;
+
+        this.damage_snd_delay = 0;
+        this.next_enemy = WAVES[this.wave].delay;
+    }
+
+    updateScore(add) {
+        this.score += add;
+        let s = Array(Math.max(SCORE_W - String(this.score).length + 1, 0)).join(0) + this.score;
+        this.res["score"] = mkCanvasText(this.res["font"], s);
+    }
+
+    updateWave() {
+        this.res["wave"] = mkCanvasText(this.res["font"], `WAVE ${this.wave + 1}`);
+    }
+
+
+    new_game() {
+        this.damage_snd_delay = 0;
+        this.next_enemy = WAVES[0].delay;
+
+        this.enemies = [];
+        this.effects = [];
+        this.player_fire = [];
+
+        this.wave = 0;
+        this.wave_count = 0;
+
+        /* render the score */
+        this.score = 0;
+        this.updateScore(0);
+
+        /* and the wave */
+        this.updateWave();
+
+        this.player = new Player(CANVAS_SIZE.w / 2 - 4, CANVAS_SIZE.h / 2 - 4, this.res["player"], this.keys, (x, y, d) => {
+            this.player_fire.push(new Bullet(x, y, this.res["bullets"], d));
+            this.playSnd(this.res["fire_snd"], false, true);
+        });
+    }
+
+    init() {
+        this.res["game_over"] = mkCanvasText(this.res["font"], "Game Over");
+        this.res["space_restart"] = mkCanvasText(this.res["font"], "(space to restart)");
+
+        this.new_game();
+    }
+
+    update(dt) {
+        if (this.player.is_alive()) {
+            this.player.update(dt);
+        } else {
+            if (this.keys["start"]) {
+                this.new_game();
+            }
+        }
+
+        this.enemies = this.enemies.filter((e) => {
+            if (e.alive) {
+                e.update(dt);
+            }
+            return e.alive;
+        });
+        this.effects = this.effects.filter((e) => {
+            if (e.alive) {
+                e.update(dt);
+            }
+            return e.alive;
+        });
+        this.player_fire = this.player_fire.filter((e) => {
+            if (e.alive) {
+                e.update(dt);
+                if (e.alive) {
+                    this.enemies.find((other) => {
+                        if (e.collisionWith(other)) {
+                            e.alive = false;
+                            other.alive = false;
+                            this.effects.push(new Explo(other.x, other.y, this.res["explo"]));
+                            this.playSnd(this.res["explo_snd"], false, true);
+                            this.updateScore(10);
+                            this.wave_count++;
+                            return true;
+                        }
+                        return false;
+                    });
+                }
+            }
+            return e.alive;
+        });
+
+        let hit = false;
+        if (this.player.is_alive()) {
+            this.enemies.forEach((e) => {
+                if (e.collisionWith(this.player)) {
+                    if (this.player.life > 0.1) {
+                        this.player.life -= 0.1;
+                    } else {
+                        this.effects.push(new Explo(this.player.x, this.player.y, this.res["explo"]));
+                        this.playSnd(this.res["explo_snd"], false, true);
+                        this.player.life = 0;
+                    }
+                    hit = true;
+                }
+            });
+            if (hit == true) {
+                if (this.damage_snd_delay < DAMAGE_SND_DELAY) {
+                    this.damage_snd_delay++;
+                } else {
+                    this.damage_snd_delay = 0;
+                    this.playSnd(this.res["damage_snd"], false, true);
+                }
+            } else {
+                this.damage_snd_delay = 0;
+                if (this.player.life < MAX_LIFE) {
+                    this.player.life += 0.01;
+                }
+            }
+
+            if (this.next_enemy) {
+                this.next_enemy--;
+            } else {
+                if (this.wave_count < WAVES[this.wave].count) {
+                    this.next_enemy = WAVES[this.wave].delay;
+                    let x = Math.floor(Math.random() * CANVAS_SIZE.w),
+                        y = Math.floor(Math.random() * CANVAS_SIZE.h);
+                    let enemy = new Slime(x, y, this.res["slime"], () => {
+                        return { x: this.player.x, y: this.player.y, is_alive: this.player.is_alive() };
+                    });
+                    this.effects.push(new Spawn(x + enemy.size.w/2, y + enemy.size.h/2, enemy, (e) => {
+                        this.enemies.push(e);
+                    }));
+                    this.playSnd(this.res["spawn_snd"], false, true);
+                } else {
+                    if (this.wave < WAVES.length) {
+                        this.wave++;
+                        this.updateWave();
+                    }
+                    this.wave_count = 0;
+                }
+            }
+        }
+    }
+
+    draw() {
+        this.enemies.forEach((e) => {
+            if (e.alive) {
+                e.draw(this.ctx);
+            }
+        });
+        this.effects.forEach((e) => {
+            e.draw(this.ctx);
+        });
+        this.player_fire.forEach((e) => {
+            e.draw(this.ctx);
+        });
+
+        if (this.player.is_alive()) {
+            this.player.draw(this.ctx);
+        }
+
+        /* health bar */
+        this.ctx.beginPath();
+        this.ctx.fillStyle = "black";
+        this.ctx.fillRect(4, 4, 42, 8);
+        this.ctx.fillStyle = "green";
+        this.ctx.fillRect(5, 5, Math.floor(this.player.life * 40 / MAX_LIFE), 6);
+        this.ctx.stroke();
+
+        /* score */
+        this.ctx.drawImage(this.res["score"], CANVAS_SIZE.w - SCORE_W * FONT_SIZE.w - 4, 4);
+
+        /* wave */
+        this.ctx.drawImage(this.res["wave"], 4, CANVAS_SIZE.h - 8 - 4);
+
+        /* game over */
+        if (this.player.life == 0) {
+            this.ctx.drawImage(this.res["game_over"], CANVAS_SIZE.w / 2 - 36, CANVAS_SIZE.h / 2 - 6);
+            this.ctx.drawImage(this.res["space_restart"], CANVAS_SIZE.w / 2 - 76, CANVAS_SIZE.h / 2 + 4);
+        }
+    }
+}