complete exercise 0.6

2024-02-05 22:06:55 +02:00 · 2024-02-05 22:06:55 +02:00 · c5c6ec4fee
commit c5c6ec4fee
parent e964c14974
2 changed files with 70 additions and 0 deletions
--- a/Walker/index.html
+++ b/Walker/index.html
@ -0,0 +1,15 @@
+<html>
+  <head>
+    <script src="https://cdn.jsdelivr.net/npm/p5@1.9.0/lib/p5.js"></script>
+    <script src="sketch.js"></script>
+    <style>
+    body {
+      background: #212121;
+    }
+    </style>
+  </head>
+  <body>
+    <main>
+    </main>
+  </body>
+</html>
--- a/Walker/sketch.js
+++ b/Walker/sketch.js
@ -0,0 +1,55 @@
+// An algorithm for picking a random number based on monte carlo method
+function acceptreject(formula) {
+  // We do this “forever” until we find a qualifying random value.
+  while (true) {
+    // Pick a random value.
+    let r1 = random(1);
+    // Assign a probability.
+    let probability = formula(r1);
+    // Pick a second random value.
+    let r2 = random(1);
+
+    //{!3} Does it qualify?  If so, we’re done!
+    if (r2 < probability) {
+      return r1;
+    }
+  }
+}
+
+class Walker {
+    constructor(x = 0, y = 0) {
+        this.x = x
+        this.y = y
+    }
+
+    step() {
+        let step = 1;
+        if (acceptreject(x => x*x) < 0.1) {
+            step = 20;
+        }
+
+        let dx = random(-step, step);
+        let dy = random(-step, step);
+
+        this.x += dx
+        this.y += dy
+    }
+
+    draw() {
+        stroke(0)
+        point(this.x, this.y)
+    }
+}
+
+let walker
+
+function setup() {
+    createCanvas(640, 240)
+    background(255)
+    walker = new Walker(320, 120)
+}
+
+function draw() {
+    walker.step();
+    walker.draw();
+}