1 files changed, 33 insertions, 4 deletions

diff --git a/level.js b/level.js
index 360b918..c10139c 100644
--- a/level.js
+++ b/level.js
@@ -41,6 +41,7 @@ export function setupLevelUi(level, root, audio) {
   ui.launchButton.type = 'button';
   ui.launchButton.value = 'Launch';
   ui.launchButton.onclick = () => {
+    ui.message.innerText = '';
     level.running = false;
     ui.rocketThrustAudio.play();
     ui.rocketGain.gain.setTargetAtTime(1, audio.currentTime, FAST_RAMP);
@@ -54,7 +55,7 @@ export function setupLevelUi(level, root, audio) {
     setTimeout(() => ui.rocketThrustAudio.pause(), 50);
     level.equations.x = math.compile(e.target.value);
     level.running = false;
-    level.path = computePath(equations);
+    level.path = computePath(level.equations);
     render(ui.ctx, level, 0);
   };
   ui.xeq.onkeydown = ui.xeq.onchange;
@@ -67,15 +68,19 @@ export function setupLevelUi(level, root, audio) {
     setTimeout(() => ui.rocketThrustAudio.pause(), 50);
     level.equations.y = math.compile(e.target.value);
     level.running = false;
-    level.path = computePath(equations);
+    level.path = computePath(level.equations);
     render(ui.ctx, level, 0);
   };
   ui.yeq.onkeydown = ui.yeq.onchange;
   ui.yeq.onkeyup = ui.yeq.onchange;
 
+  ui.message = document.createElement('h1');
+  ui.id = "level-message";
+
+  root.appendChild(ui.launchButton);
   root.appendChild(ui.xeq);
   root.appendChild(ui.yeq);
-  root.appendChild(ui.launchButton);
+  root.appendChild(ui.message);
 
   ui.canvas = document.createElement('canvas');
   ui.canvas.width = 600;
@@ -93,7 +98,14 @@ export function setupLevelUi(level, root, audio) {
 
 function stepLevel(ui, level, index) {
   render(ui.ctx, level, index);
-  if (level.running && index < level.path.length-1) {
+  const pos = level.path[index];
+  if (distance(pos, level.home) < 0.4) {
+    level.running = false;
+    ui.rocketGain.gain.setTargetAtTime(0, ui.audio.currentTime, FAST_RAMP);
+    setTimeout(() => ui.rocketThrustAudio.pause(), 50);
+    finishLevel(ui, level);
+    render(ui.ctx, level, 0);
+  } else if (level.running && index < level.path.length-1) {
     setTimeout(() => stepLevel(ui, level, index+1), 1);
   } else {
     level.running = false;
@@ -110,3 +122,20 @@ function computePath(equations, start, end, step) {
 }
 
 
+function distance(p1, p2) {
+  const [x1, y1] = p1;
+  const [x2, y2] = p2;
+  return Math.sqrt((x2-x1)**2 + (y2-y1)**2);
+}
+
+
+function finishLevel(ui, level) {
+  const uncollected = level.resources.reduce((acc, { collected }) => acc + (collected ? 0 : 1), 0);
+  if (uncollected > 0) {
+    ui.message.innerText = 'resources remaining!';
+  } else {
+    ui.message.innerText = 'mission complete!';
+    level.completed = true;
+  }
+  level.resources.forEach(x => x.collected = false);
+}