improve ecosystem project

Ecosystem Project/sketch.js

@@ -1,60 +1,118 @@
-// 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.t = 0
-        this.x = x
-        this.y = y
+    constructor(
+        position,
+        speed,
+        topSpeed,
+        trailSize,
+        color,
+        accelerationType,
+        headSize
+    ) {
+        this.t = random(1000000)
+        this.position = position
+        this.velocity = createVector(0, 0)
+        this.acceleration = createVector(0, 0)
+
+        this.trail = []
+        this.trailSize = trailSize
+
+        this.speed = speed
+        this.topSpeed = topSpeed
+        this.color = color
+        this.accelerationType = accelerationType
+        this.headSize = headSize
     }
 
-    step() {
-        let dx, dy
-        if (noise(this.t+20000) < 0.5) {
-            let step = -1.5
-            dx = random(-step, step)
-            dy = random(-step, step)
-        } else {
-            let step = 0.5;
-            dx = map(noise(this.t), 0, 1, -1, 1)*step;
-            dy = map(noise(this.t+10000), 0, 1, -1, 1)*step;
+    step(dt) {
+        let dx = this.acceleration.x
+        let dy = this.acceleration.y
+        if (this.accelerationType == "noise") {
+            dx = map(noise(this.t), 0, 1, -1, 1)
+            dy = map(noise(this.t + 10000), 0, 1, -1, 1)
+        } else if (this.accelerationType == "random") {
+            if (random(0, 1) < 0.15) {
+                dx = random(-1, 1)
+                dy = random(-1, 1)
+            }
         }
 
-        this.x = (this.x + dx) % width
-        this.y = (this.y + dy) % height
-        this.t += 0.01
+        this.acceleration = createVector(dx, dy).normalize()
+        this.acceleration.setMag(this.speed)
+
+        this.velocity.add(p5.Vector.mult(this.acceleration, dt))
+        this.velocity.limit(this.topSpeed)
+        this.position.add(p5.Vector.mult(this.velocity, dt))
+        this.t += dt/2
+
+        this.position.x = (this.position.x + width) % width
+        this.position.y = (this.position.y + height) % height
+
+        this.trail.push(this.position.copy())
+        if (this.trail.length > this.trailSize) {
+            this.trail.splice(0, 1)
+        }
     }
 
     draw() {
-        stroke(0)
-        point(this.x, this.y)
+        stroke(this.color)
+        for (var p of this.trail) {
+            point(p)
+        }
+        circle(this.position.x, this.position.y, this.headSize)
+        // line(this.position.x, this.position.y, this.position.x+this.velocity.x, this.position.y+this.velocity.y)
     }
 }
 
-let walker
+let speedUp = 0
+let creatures = []
+
+let speedUpSlider
 
 function setup() {
     createCanvas(640, 240)
     background(255)
-    walker = new Walker(320, 120)
+
+    for (let i = 0; i < 20; i++) {
+        creatures.push(new Walker(
+            createVector(random(0, width), random(0, height)),
+            10,
+            10,
+            200,
+            color(20, 200, 20),
+            "noise",
+            3
+        ))
+    }
+
+    for (let i = 0; i < 50; i++) {
+        creatures.push(new Walker(
+            createVector(random(0, width), random(0, height)),
+            400,
+            50,
+            10,
+            color(20, 20, 20),
+            "random",
+            1
+        ))
+    }
+
+    speedUpSlider = createSlider(0, 10, 0)
+    speedUpSlider.changed(() => {
+        speedUp = speedUpSlider.value()
+    })
 }
 
 function draw() {
-    walker.step();
-    walker.draw();
+    background(255)
+
+    // let fps = frameRate();
+    // text(Math.round(fps), 50, 50);
+
+    let dt = deltaTime / 1000
+    for (let i = 0; i < speedUp + 1; i++) {
+        for (var creature of creatures) {
+            creature.step(dt)
+            creature.draw()
+        }
+    }
 }