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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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