Merge pull request #1838 from berkenbu/master

New App: Falcon 9 lander

apps/f9lander/ChangeLog

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+0.01: New App!

apps/f9lander/README.md

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+# F9 Lander
+
+Land a Falcon 9 booster on a drone ship.
+
+## Game play
+
+Attempt to land your Falcon 9 booster on a drone ship before running out of fuel.
+A successful landing requires:
+ * setting down on the ship
+ * the booster has to be mostly vertical
+ * the landing speed cannot be too high
+
+## Controls
+
+The angle of the booster is controlled by tilting the watch side-to-side. The
+throttle level is controlled by tilting the watch forward and back:
+ * screen horizontal (face up) means no throttle
+ * screen vertical corresponds to full throttle
+
+The fuel burn rate is proportional to the throttle level.
+
+## Creators
+Liam Kl. B.
+
+Marko Kl. B.
+
+## Screenshots
+
+![](f9lander_screenshot1.png)
+
+![](f9lander_screenshot2.png)
+
+![](f9lander_screenshot3.png)

apps/f9lander/app-icon.js

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+require("heatshrink").decompress(atob("mEwwcA/4AD/P8yVJkgCCye27dt2wRE//kCIuSuwRIBwgCCpwRQpIRRnYRQkmdCIvPCJICBEZ4RG/IRP/15CJ/z5IRPz4RM/gQB/n+BxICCn/z/P/BxQCDz7mIAX4Cq31/CJ+ebpiYE/IR/CNP/5IROnn//4jP5DFQ5sJCKAjPk3oCMMk4QRQAX4Ckn7jBAA/5CK8nCJPJNHA"))

apps/f9lander/app.js

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+const falcon9 = Graphics.createImage(`
+     xxxxx    
+ xxxxx   xxxxx
+     x   x    
+     x   x    
+     xxxxx    
+     xxxxx    
+     xxxxx    
+     xxxxx    
+     xxxxx    
+     xxxxx    
+     xxxxx    
+     xxxxx    
+     xxxxx    
+     xxxxx    
+     xxxxx    
+     xxxxx   
+     xxxxx    
+     xxxxx  
+   xxxxxxxxx 
+ xx  xxxxx  xx
+xx           xx`);
+
+const droneShip = Graphics.createImage(`
+xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
+xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
+ xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
+  xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
+  xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
+`);
+
+const droneX = Math.floor(Math.random()*(g.getWidth()-droneShip.width-40) + 20)
+const cloudOffs = Math.floor(Math.random()*g.getWidth()/2);
+
+const oceanHeight = g.getHeight()*0.1;
+
+const targetY = g.getHeight()-oceanHeight-falcon9.height/2;
+
+var booster = { x : g.getWidth()/4 + Math.random()*g.getWidth()/2,
+                y : 20,
+                vx : 0,
+                vy : 0,
+                mass : 100,
+                fuel : 100 };
+
+var exploded = false;
+var nExplosions = 0;
+var landed = false;
+
+const gravity = 4;
+const dt = 0.1;
+const fuelBurnRate = 20*(176/g.getHeight());
+const maxV = 12;
+
+function flameImageGen (throttle) {
+  var str = " xxx \n xxx \n";
+  str += "xxxxx\n".repeat(throttle);
+  str += " xxx \n  x  \n";
+  return Graphics.createImage(str);
+}
+
+function drawFalcon(x, y, throttle, angle) {
+  g.setColor(1, 1, 1).drawImage(falcon9, x, y, {rotate:angle});
+  if (throttle>0) {
+    var flameImg = flameImageGen(throttle);
+    var r = falcon9.height/2 + flameImg.height/2-1;
+    var xoffs = -Math.sin(angle)*r;
+    var yoffs = Math.cos(angle)*r;
+    if (Math.random()>0.7) g.setColor(1, 0.5, 0);
+    else g.setColor(1, 1, 0);
+    g.drawImage(flameImg, x+xoffs, y+yoffs, {rotate:angle});
+  }
+}
+
+function drawBG() {
+  g.setBgColor(0.2, 0.2, 1).clear();
+  g.setColor(0, 0, 1).fillRect(0, g.getHeight()-oceanHeight, g.getWidth()-1, g.getHeight()-1);
+  g.setColor(0.5, 0.5, 1).fillCircle(cloudOffs+34, 30, 15).fillCircle(cloudOffs+60, 35, 20).fillCircle(cloudOffs+75, 20, 10);
+  g.setColor(1, 1, 0).fillCircle(g.getWidth(), 0, 20);
+  g.setColor(1, 1, 1).drawImage(droneShip, droneX, g.getHeight()-oceanHeight-1);
+}
+
+function showFuel() {
+  g.setColor(0, 0, 0).setFont("4x6:2").setFontAlign(-1, -1, 0).drawString("Fuel: "+Math.abs(booster.fuel).toFixed(0), 4, 4);
+}
+
+function renderScreen(input) {
+  drawBG();
+  showFuel();
+  drawFalcon(booster.x, booster.y, Math.floor(input.throttle*12), input.angle);
+}
+
+function getInputs() {
+  var accel = Bangle.getAccel();
+  var a = Math.PI/2 + Math.atan2(accel.y, accel.x);
+  var t = (1+accel.z);
+  if (t > 1) t = 1;
+  if (t < 0) t = 0;
+  if (booster.fuel<=0) t = 0;
+  return {throttle: t, angle: a};
+}
+
+function epilogue(str) {
+  g.setFont("Vector", 24).setFontAlign(0, 0, 0).setColor(0, 0, 0).drawString(str, g.getWidth()/2, g.getHeight()/2).flip();
+  g.setFont("Vector", 16).drawString("<= again      exit =>", g.getWidth()/2, g.getHeight()/2+20);
+  clearInterval(stepInterval);
+  Bangle.on("swipe", (d) => { if (d>0) load(); else load('f9lander.app.js'); });
+}
+
+function gameStep() {
+  if (exploded) {
+    if (nExplosions++ < 15) {
+      var r = Math.random()*25;
+      var x = Math.random()*30 - 15;
+      var y = Math.random()*30 - 15;
+      g.setColor(1, Math.random()*0.5+0.5, 0).fillCircle(booster.x+x, booster.y+y, r);
+      if (nExplosions==1) Bangle.buzz(600);
+    }
+    else epilogue("You crashed!");
+  }
+  else {
+    var input = getInputs();
+    if (booster.y >= targetY) {
+//      console.log(booster.x + " " + booster.y + " " + booster.vy + " " + droneX + " " + input.angle);
+      if (Math.abs(booster.x-droneX-droneShip.width/2)<droneShip.width/2 && Math.abs(input.angle)<Math.PI/8 && booster.vy<maxV) {
+        renderScreen({angle:0, throttle:0});
+        epilogue("You landed!");
+      }
+      else exploded = true;
+    }
+    else {
+      booster.x += booster.vx*dt;
+      booster.y += booster.vy*dt;
+      booster.vy += gravity*dt;
+      booster.fuel -= input.throttle*dt*fuelBurnRate;
+      booster.vy += -Math.cos(input.angle)*input.throttle*gravity*3*dt;
+      booster.vx += Math.sin(input.angle)*input.throttle*gravity*3*dt;
+      renderScreen(input);
+    }
+  }
+}
+
+var stepInterval;
+Bangle.setLCDTimeout(0);
+renderScreen({angle:0, throttle:0});
+g.setFont("Vector", 24).setFontAlign(0, 0, 0).setColor(0, 0, 0).drawString("Swipe to start", g.getWidth()/2, g.getHeight()/2);
+Bangle.on("swipe", () => {
+  stepInterval = setInterval(gameStep, Math.floor(1000*dt));
+  Bangle.removeListener("swipe");
+});

apps/f9lander/metadata.json

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+{ "id": "f9lander",
+  "name": "Falcon9 Lander",
+  "shortName":"F9lander",
+  "version":"0.01",
+  "description": "Land a rocket booster",
+  "icon": "f9lander.png",
+  "screenshots" : [ { "url":"f9lander_screenshot1.png" }, { "url":"f9lander_screenshot2.png" }, { "url":"f9lander_screenshot3.png" }],
+  "readme": "README.md",
+  "tags": "game",
+  "supports" : ["BANGLEJS", "BANGLEJS2"],
+  "storage": [
+    {"name":"f9lander.app.js","url":"app.js"},
+    {"name":"f9lander.img","url":"app-icon.js","evaluate":true}
+  ]
+}