From 9be73c2d0f21a539bc46974139e8c36c12845ca0 Mon Sep 17 00:00:00 2001
From: Fbenas <philbeansburton@gmail.com>
Date: Sun, 20 Sep 2020 22:08:03 +0100
Subject: Initial commit

---
 public/js/app.js | 186 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 186 insertions(+)
 create mode 100644 public/js/app.js

(limited to 'public/js/app.js')

diff --git a/public/js/app.js b/public/js/app.js
new file mode 100644
index 0000000..b50828e
--- /dev/null
+++ b/public/js/app.js
@@ -0,0 +1,186 @@
+class Component {
+
+    constructor(radius, color, x, y, direction) {
+        this.perceptionDistance = 20;
+        this.turnStepAmount = 5;
+        this.collisionTurnStepAmount = 20;
+        this.stepAmount = 1;
+        this.radius = radius;
+        this.x = x;
+        this.y = y;
+        this.direction = direction;
+        this.color = color;
+    }
+
+    move(context) {
+        this.direction += Math.random() * (2 * this.turnStepAmount) - this.turnStepAmount
+        var localDirection = this.direction;
+        // first we need to work out if we detect any walls
+        var perceptionVector = this.detectionPoint(this.x, this.y, this.perceptionDistance, localDirection);
+
+        while (perceptionVector.x < 0 || perceptionVector.y < 0 || perceptionVector.x > context.canvas.width || perceptionVector.y > context.canvas.height) {
+            localDirection += Math.random() * (2 * this.collisionTurnStepAmount) - this.collisionTurnStepAmount
+            perceptionVector = this.detectionPoint(this.x, this.y, this.perceptionDistance, localDirection);
+        }
+
+        // Here we should now have a new vector that's not clipping
+        this.direction = localDirection;
+        var vector = this.detectionPoint(this.x, this.y, this.stepAmount, this.direction);
+
+
+        this.x = vector.x;
+        this.y = vector.y;
+        this.update(context);
+    }
+
+    update(context) {
+        context.beginPath();
+        context.fillStyle = "blue";
+        context.arc(this.x, this.y, this.radius, 0, 2 * Math.PI);
+        context.stroke();
+
+        context.restore();
+        context.beginPath();
+        this.lineToAngle(context, this.x, this.y, this.perceptionDistance, this.direction);
+        context.lineWidth = 1;
+        // context.stroke();
+
+        context.restore();
+    }
+
+    lineToAngle(context, x1, y1, length, angle) {
+
+        angle *= Math.PI / 180;
+
+        var x2 = x1 + length * Math.cos(angle),
+            y2 = y1 + length * Math.sin(angle);
+
+        context.moveTo(x1, y1);
+        context.lineTo(x2, y2);
+
+        return {
+            x: x2,
+            y: y2
+        };
+    }
+
+    detectionPoint(x1, y1, length, angle) {
+
+        angle *= Math.PI / 180;
+
+        var x2 = x1 + length * Math.cos(angle),
+            y2 = y1 + length * Math.sin(angle);
+
+        return {
+            x: x2,
+            y: y2
+        };
+    }
+
+}
+
+class GameArea {
+
+    constructor(canvas_width, canvas_height) {
+        this.canvas = document.createElement("canvas");
+        this.canvas_width = canvas_width;
+        this.canvas_height = canvas_height;
+    }
+
+    init() {
+        this.canvas.width = this.canvas_width;
+        this.canvas.height = this.canvas_height;
+        this.context = this.canvas.getContext("2d");
+        document.getElementById('container').appendChild(this.canvas);
+    }
+
+    clear() {
+        this.context.clearRect(0, 0, this.canvas.width, this.canvas.height);
+    }
+
+}
+
+class Scene {
+
+    constructor(component_size, no_of_components) {
+        this.component_size = component_size;
+        this.no_of_components = no_of_components;
+        this.components = new Array;
+        this.gameArea = {};
+        this.initGameArea();
+        this.initComponents();
+        this.started = false;
+    }
+
+    initComponents() {
+        for (let i = 0; i < this.no_of_components; i++) {
+            let new_component = new Component(
+                this.component_size,
+                "black",
+                Math.random() * this.gameArea.canvas.width,
+                Math.random() * this.gameArea.canvas.height,
+                Math.random() * 360
+            );
+            this.components.push(new_component);
+        }
+    }
+
+    initGameArea() {
+        this.gameArea = new GameArea(600, 600);
+        this.gameArea.init()
+    }
+
+    start() {
+        if (this.started) {
+            return;
+        }
+
+        // Kinda annoying, setInterval is a piece of shite and is always run from global scope
+        // Therefore "this.update" will be undefined unless we bind it
+        const updateMe = this.update.bind(this);
+        this.interval = setInterval(updateMe, 5);
+        this.started = true;
+    }
+
+    update() {
+        this.gameArea.clear();
+        for (let i = 0; i < this.no_of_components; i++) {
+            this.components[i].move(this.gameArea.context);
+        }
+    }
+
+    stop() {
+        if (!this.started) {
+            return;
+        }
+
+        clearInterval(this.interval);
+        this.interval = null;
+        this.started = false;
+    }
+
+    reset() {
+        if (this.started) {
+            this.stop();
+        }
+        this.components = new Array;
+        this.initComponents();
+        this.gameArea.clear();
+        this.started = false;
+    }
+
+}
+
+let scene = new Scene(2, 500);
+
+function stop() {
+    scene.stop();
+}
+
+function start() {
+    scene.start();
+}
+
+function reset() {
+    scene.reset();
+}
-- 
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