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main.js
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main.js
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var canvas;
var canvasContext;
var ballX = 50;
var ballSpeedX = 10;
var ballY = 50;
var ballSpeedY = 6;
var player1score = 0;
var player2score = 0;
const WINNING_SCORE = 3;
var showingWinScreen = false;
var paddle1Y = 250;
var paddle2Y = 250;
const PADDLE_HEIEGHT = 100;
function calculateMousePos(evt) {
var rect = canvas.getBoundingClientRect();
var root = document.documentElement;
var mouseX = evt.clientX - rect.left - root.scrollLeft;
var mouseY = evt.clientY - rect.top - root.scrollTop;
return{
x:mouseX,
y:mouseY
};
}
function handleMouseClick(evt) {
if(showingWinScreen){
player1score =0;
player2score =0;
showingWinScreen =false;
}
}
window.onload = function() {
canvas = document.getElementById("gameCanvas");
canvasContext = canvas.getContext('2d');
var framesPerSecond = 40;
setInterval(function(){
moveEverything();
drawEverything();
}, 1000/framesPerSecond);
canvas.addEventListener('mousedown', handleMouseClick);
canvas.addEventListener('mousemove', function(evt){
var mousePos = calculateMousePos(evt);
paddle1Y = mousePos.y - PADDLE_HEIEGHT/2;
});
}
function ballReset() {
if(player1score >= WINNING_SCORE || player2score >= WINNING_SCORE){
showingWinScreen = true;
}
ballSpeedX = -ballSpeedX
ballX = canvas.width/2;
ballY = canvas.height/2;
}
function computerMovement() {
var paddle2YCenter = paddle2Y + (PADDLE_HEIEGHT/2);
if(paddle2YCenter < ballY-35){
paddle2Y += 6;
}
else if(paddle2YCenter > ballY+35)
paddle2Y -= 6;
}
function moveEverything(){
if(showingWinScreen){
return;
}
computerMovement();
ballX += ballSpeedX;
ballY += ballSpeedY;
if(ballX > canvas.width){
if(ballY > paddle2Y &&
ballY < paddle2Y+PADDLE_HEIEGHT)
ballSpeedX = -ballSpeedX;
else{
player1score++;
ballReset();
}}
if(ballX < 0){
//
if(ballY > paddle1Y &&
ballY < paddle1Y+PADDLE_HEIEGHT)
ballSpeedX = -ballSpeedX;
else{
player2score++;
ballReset();
}}
if(ballY > canvas.height){
ballSpeedY = -ballSpeedY;
}
if(ballY < 0){
ballSpeedY = -ballSpeedY;
}
}
function drawNet(){
for(var i=0; i<canvas.height; i+=40) {
colorRect(canvas.width/2 - 1, i, 2,20,'white');
}
}
function drawEverything() {
colorRect(0, 0, canvas.width, canvas.height, 'green'); //blank screen
if(showingWinScreen){
canvasContext.fillStyle = 'white';
if(player1score >= WINNING_SCORE) {
canvasContext.fillText("Left Player Won!", 350, 200);
}
else if(player2score >= WINNING_SCORE) {
canvasContext.fillText("Right Player Won!", 350, 200);
}
canvasContext.fillText('Click To Continue', 350, 500);
return;
}
drawNet();
colorRect(0, paddle1Y, 10, PADDLE_HEIEGHT,'white') //left player paddle
colorRect(canvas.width-10, paddle2Y, 10, PADDLE_HEIEGHT,'white')
colorCircle(ballX, ballY, 10,'white'); //draws the ball
canvasContext.fillText(player1score, 100, 100);
canvasContext.fillText(player2score, canvas.width-100, 100)
}
function colorRect(leftX,topY, width,height, drawColor){
canvasContext.fillStyle = drawColor;
canvasContext.fillRect(leftX,topY, width,height);
}
function colorCircle(centerX, centerY, radius, drawColor){
canvasContext.fillStyle = drawColor;
canvasContext.beginPath();
canvasContext.arc(centerX, centerY, radius, 0,Math.PI*2, true);
canvasContext.fill();
}