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main.js
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main.js
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// setup canvas
const canvas = document.querySelector('canvas');
const ctx = canvas.getContext('2d');
const p = document.createElement('p');
const width = canvas.width = window.innerWidth;
const height = canvas.height = window.innerHeight;
document.querySelector('h1').append(p);
// function to generate random number
function random(min, max) {
const num = Math.floor(Math.random() * (max - min + 1)) + min;
return num;
}
//Shape
class Shape{
constructor(x, y, velX, velY,exist){
this.x=x;
this.y=y;
this.velX=velX;
this.velY=velY;
this.exist=exist;
}
}
//#region Balls
class Ball extends Shape{
constructor(x, y, velX, velY, color, size,exist){
super(x,y, velX, velY,exist)
this.color=color;
this.size=size;
}
draw(){
ctx.beginPath();
ctx.fillStyle=this.color;
ctx.arc(this.x,this.y,this.size,0,2*Math.PI);
ctx.fill();
}
update(){
if((this.x+this.size)>=width){
this.velX=-this.velX;
}
if((this.x-this.size)<=0){
this.velX=-this.velX;
}
if((this.y+this.size)>=height){
this.velY=-this.velY;
}
if((this.y+this.size)<=0){
this.velY=-this.velY;
}
this.x+=this.velX;
this.y+=this.velY;
}
collisionDetect(){
for(let j=0;j<balls.length;j++){
if(!(this===balls[j])&&balls[j].exist){
const dx=this.x-balls[j].x;
const dy=this.y-balls[j].y;
const distance = Math.sqrt(dx*dx+dy*dy);
if(distance<this.size+balls[j].size){
balls[j].color=`rgb(${random(0,255)},${random(0,255)},${random(0,255)})`;
}
}
}
}
}
//#endregion
//#region EvilBalls
class EvilBalls extends Shape{
constructor(x,y,exist,velX=20,velY=20,color='black',size=10){
super(x,y,velX,velY,exist)
this.color=color;
this.size=size;
}
draw(){
ctx.beginPath();
ctx.lineWidth=4;
ctx.strokeStyle=this.color;
ctx.arc(this.x,this.y,this.size,0,2*Math.PI);
ctx.stroke();
}
checkBounds(){
if((this.x+this.size)>=width){
this.x-=0.5*(this.size);
}
if((this.x-this.size)<=0){
this.x+=0.5*(this.size);
}
if((this.y+this.size)>=height){
this.y-=0.5*(this.size);
}
if((this.y+this.size)<=0){
this.y+=0.5*(this.size);
}
}
setControls(){
let _this=this;
window.onkeydown=function(e){
if(e.key=="a"){
_this.x-=_this.velX;
}
if(e.key=="d"){
_this.x+=_this.velX;
}
if(e.key=="w"){
_this.y-=_this.velY;
}
if(e.key=="s"){
_this.y+=_this.velY;
}
}
}
collisionDetect(){
for(let j=0;j<balls.length;j++){
if(balls[j].exist){
const dx=this.x-balls[j].x;
const dy=this.y-balls[j].y;
const distance = Math.sqrt(dx*dx+dy*dy);
if(distance<this.size+balls[j].size){
balls[j].exist=false;
//balls.splice(j,1);
counts--;
document.querySelector('p').textContent="Ball Counts :"+counts;
}
}
}
}
}
//#endregion
//let testBall = new Ball(300,100,7,7,'red',10);
//testBall.draw();
let initialCounts=40;
let counts=0;
let getcount=document.querySelector('p');
let balls = [];
while(balls.length<initialCounts){
let size=random(10,20);
let ball = new Ball(
random(0+size,width-size),
random(0+size,height-size),
random(-7,7),
random(-7,7),
`rgba(${random(0,255)},${random(0,255)},${random(0,255)})`,
size,
true
)
balls.push(ball);
counts++;
document.querySelector('p').textContent="Ball Counts :"+counts;
}
function loop(){
//background color
ctx.fillStyle='rgba(235,112,119,0.3)';
ctx.fillRect(0,0,width,height);
for(let i=0;i<balls.length;i++){
if(balls[i].exist){
balls[i].draw();
balls[i].update();
balls[i].collisionDetect();
}
}
//restart the game
if(counts==0){
counts=initialCounts;
balls.map(x=>x.exist=true);
}
requestAnimationFrame(loop);
}
//x,y,velX=20,velY=20,color='white',size=10,exist
let EvilBall = new EvilBalls(
100,500,true
)
function EvilBallMove(){
EvilBall.draw();
EvilBall.setControls();
EvilBall.checkBounds();
EvilBall.collisionDetect();
requestAnimationFrame(EvilBallMove);
}
loop();
EvilBallMove();