From 8f2bf34585dff32839bf48f9e2bde65617ab7c0a Mon Sep 17 00:00:00 2001
From: Gordon Williams <gw@pur3.co.uk>
Date: Thu, 7 Nov 2019 09:50:03 +0000
Subject: [PATCH] asteroids

---
 apps.json              |  11 +++
 apps/asteroids-icon.js |   1 +
 apps/asteroids.js      | 171 +++++++++++++++++++++++++++++++++++++++++
 apps/asteroids.json    |   5 ++
 apps/asteroids.png     | Bin 0 -> 1689 bytes
 favicon.ico            | Bin 0 -> 1150 bytes
 6 files changed, 188 insertions(+)
 create mode 100644 apps/asteroids-icon.js
 create mode 100644 apps/asteroids.js
 create mode 100644 apps/asteroids.json
 create mode 100644 apps/asteroids.png
 create mode 100644 favicon.ico

diff --git a/apps.json b/apps.json
index aa1f751a0..976c3c8ad 100644
--- a/apps.json
+++ b/apps.json
@@ -33,6 +33,17 @@
       {"name":"*trex","url":"trex-icon.js","evaluate":true}
     ]
   },
+  { "id": "astroid",
+    "name": "Asteroids!",
+    "icon": "asteroids.png",
+    "description": "Retro asteroids game",
+    "tags": "game",
+    "storage": [
+      {"name":"+astroid","url":"asteroids.json"},
+      {"name":"-astroid","url":"asteroids.js"},
+      {"name":"*astroid","url":"asteroids-icon.js","evaluate":true}
+    ]
+  },
   { "id": "compass",
     "name": "Compass",
     "icon": "compass.png",
diff --git a/apps/asteroids-icon.js b/apps/asteroids-icon.js
new file mode 100644
index 000000000..7e6afcfdb
--- /dev/null
+++ b/apps/asteroids-icon.js
@@ -0,0 +1 @@
+require("heatshrink").decompress(atob("mEwghC/ADkN6APN7oDGC64AWDRw9DIIgXVLh/eAYQtEFxsN7oqCCQQDBC5oOBC4IDHFxgmBAY4uvGJQuMC5IuLhpdWMBQuMSBQuMF5IubhqHDFyIfGX5giFkWQGYa/KEQcCkQACmA6KFwwWDkUgNJJVGFwgABFwoXGBYIuGC4jrL8AuBmczJAgLBRhAXCFwQXGRhIXGkUjI4i/CapReHC4KEEC6a/KC48jmQXCfQoXNX44XJawx3CX5gXHXwQuJcYYXHFxaaEhIXEFxiyFGIeQFxqEIFxy0HhwuOFAgAFCxowDAAguODA4WRAH4ADA=="))
diff --git a/apps/asteroids.js b/apps/asteroids.js
new file mode 100644
index 000000000..cb44db904
--- /dev/null
+++ b/apps/asteroids.js
@@ -0,0 +1,171 @@
+Bangle.setLCDMode("doublebuffered");
+
+var W = g.getWidth();
+var H = g.getHeight();
+g.setFontAlign(0,-1);
+var BTNL = BTN4;
+var BTNR = BTN5;
+var BTNU = BTN1;
+var BTNA = BTN2;
+
+function newAst(x,y) {
+  var a = {
+    x:x,y:y,
+    vx:Math.random()-0.5,
+    vy:Math.random()-0.5,
+    rad:3+Math.random()*5
+  };
+  return a;
+}
+
+var running = true;
+var ship = {};
+var ammo = [];
+var ast = [];
+var score = 0;
+var level = 4;
+var timeSinceFired = 0;
+var lastFrame;
+
+function gameStop() {
+  running = false;
+  g.clear();
+  g.drawString("Game Over!",120,(H-6)/2);
+  g.flip();
+}
+
+function addAsteroids() {
+  for (var i=0;i<level;i++) {
+    var d,x,y;
+    do {
+      x = Math.random()*W; y = Math.random()*H;
+      var dx = x-ship.x, dy = y-ship.y;
+      d = Math.sqrt(dx*dx+dy*dy);
+    } while (d<10);
+    ast.push(newAst(x,y));
+  }
+}
+
+function gameStart() {
+  ammo = [];
+  ast = [];
+  score = 0;
+  level = 4;
+  ship = { x:W/2,y:H/2,r:0,v:0 };
+  timeSinceFired = 0;
+  addAsteroids();
+  running = true;
+}
+
+
+function onFrame() {
+  var t = getTime();
+  var d = (lastFrame===undefined)?0:(t-lastFrame)*20;
+  lastFrame = t;
+
+  if (!running) {
+    if (BTNA.read()) gameStart();
+    return;
+  }
+
+  if (BTNL.read()) ship.r-=0.1*d;
+  if (BTNR.read()) ship.r+=0.1*d;
+  ship.v *= Math.pow(0.9,d);
+  if (BTNU.read()) ship.v+=0.2*d;
+  ship.x += Math.cos(ship.r)*ship.v*d;
+  ship.y += Math.sin(ship.r)*ship.v*d;
+  if (ship.x<0) ship.x+=W;
+  if (ship.y<0) ship.y+=H;
+  if (ship.x>=W) ship.x-=W;
+  if (ship.y>=H) ship.y-=H;
+  timeSinceFired+=d;
+  if (BTNA.read() && timeSinceFired>4) { // fire!
+    Bangle.beep(10);
+    timeSinceFired = 0;
+    ammo.push({
+      x:ship.x+Math.cos(ship.r)*4,
+      y:ship.y+Math.sin(ship.r)*4,
+      vx:Math.cos(ship.r)*3,
+      vy:Math.sin(ship.r)*3,
+    });
+  }
+
+  g.clear();
+
+  g.drawString(score,120,0);
+  var rs = Math.PI*0.8;
+  g.drawPoly([
+    ship.x+Math.cos(ship.r)*4, ship.y+Math.sin(ship.r)*4,
+    ship.x+Math.cos(ship.r+rs)*3, ship.y+Math.sin(ship.r+rs)*3,
+    ship.x+Math.cos(ship.r-rs)*3, ship.y+Math.sin(ship.r-rs)*3,
+  ],true);
+  var na = [];
+  ammo.forEach(function(a) {
+    a.x += a.vx*d;
+    a.y += a.vy*d;
+    g.fillRect(a.x-1, a.y, a.x+1, a.y);
+    g.fillRect(a.x, a.y-1, a.x, a.y+1);
+    var hit = false;
+    ast.forEach(function(b) {
+      var dx = a.x-b.x;
+      var dy = a.y-b.y;
+      var d = Math.sqrt(dx*dx+dy*dy);
+      if (d<b.rad) {
+        hit=true;
+        b.hit=true;
+        score++;
+      }
+    });
+    if (!hit && a.x>=0 && a.y>=0 && a.x<W && a.y<H)
+      na.push(a);
+  });
+  ammo=na;
+  na = [];
+  var crashed = false;
+  ast.forEach(function(a) {
+    a.x += a.vx*d;
+    a.y += a.vy*d;
+    g.drawCircle(a.x, a.y, a.rad);
+    if (a.x<0) a.x+=W;
+    if (a.y<0) a.y+=H;
+    if (a.x>=W) a.x-=W;
+    if (a.y>=H) a.y-=H;
+    if (!a.hit) {
+      na.push(a);
+    } else if (a.rad>4) {
+      Bangle.buzz(100);
+      a.hit = false;
+      var vx = 1*(Math.random()-0.5);
+      var vy = 1*(Math.random()-0.5);
+      a.rad/=2;
+      na.push({
+        x:a.x,
+        y:a.y,
+        vx:a.vx-vx,
+        vy:a.vy-vy,
+        rad:a.rad,
+      });
+      a.vx += vx;
+      a.vy += vy;
+      na.push(a);
+    }
+
+    var dx = a.x-ship.x;
+    var dy = a.y-ship.y;
+    var d = Math.sqrt(dx*dx+dy*dy);
+    if (d < a.rad) crashed = true;
+  });
+  ast=na;
+  if (!ast.length) {
+    level++;
+    addAsteroids();
+  }
+  g.flip();
+  if (crashed) {
+    Bangle.buzz(500);
+    gameStop();
+  }
+}
+
+gameStart();
+setInterval(onFrame, 50);
diff --git a/apps/asteroids.json b/apps/asteroids.json
new file mode 100644
index 000000000..87dedc86d
--- /dev/null
+++ b/apps/asteroids.json
@@ -0,0 +1,5 @@
+{
+  "name":"Asteroids!",
+  "icon":"*astroid",
+  "src":"-astroid"
+}
diff --git a/apps/asteroids.png b/apps/asteroids.png
new file mode 100644
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