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index.html
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index.html
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<!DOCTYPE html>
<html>
<canvas id="gameCanvas" width="1200" height="800"></canvas>
</html>
<script>
var canvas;
var canvasContext;
var ballX = 50;
var ballY = 50;
var ballSpeedX = 10;
var ballSpeedY = 4;
var player1Score = 0;
var player2Score = 0;
const WINNING_SCORE = 5;
var showingWinScreen = false;
var paddle1Y = 250;
var paddle2Y = 250;
const PADDLE_HEIGHT = 70;
const PADDLE_THICKNESS = 10;
const PADDLE_OFFSET = 15;
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 = 30;
setInterval(function() {
moveEverything();
drawEverything();
}, 1000/framesPerSecond);
canvas.addEventListener('mousedown',handleMouseClick);
canvas.addEventListener('mousemove', function(evt) {
var mousePos = calculateMousePos(evt);
paddle1Y = mousePos.y-(PADDLE_HEIGHT/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_HEIGHT/2);
if(paddle2YCenter < ballY-35) {
paddle2Y += 6;
} else if (paddle2YCenter > ballY+35) {
paddle2Y -= 6;
}
}
// move horizontally
function moveEverything() {
if(showingWinScreen) {
return;
}
computerMovement();
ballX += ballSpeedX;
ballY += ballSpeedY;
if(ballX < 0) {
if(ballY > paddle1Y && ballY < paddle1Y+PADDLE_HEIGHT) {
ballSpeedX = -ballSpeedX;
var deltaY = ballY - (paddle1Y + PADDLE_HEIGHT/2);
ballSpeedY = deltaY*0.35;
} else {
player2Score++; // must be before ballReset();
ballReset();
}
}
if(ballX > canvas.width) {
if(ballY > paddle2Y && ballY < paddle2Y+PADDLE_HEIGHT) {
ballSpeedX = -ballSpeedX;
var deltaY = ballY - (paddle2Y + PADDLE_HEIGHT/2);
ballSpeedY = deltaY*0.35;
} else {
player1Score++;
ballReset();
}
}
if(ballY < 0) {
ballSpeedY = -ballSpeedY;
}
if(ballY > canvas.height) {
ballSpeedY = -ballSpeedY;
}
}
function drawNet() {
for (var i=0; i<canvas.height; i+=40) {
colorRect(canvas.width/2-1,i,2,20,'red');
}
}
function drawEverything() {
// next line blanks out the screen with black
colorRect(0,0,canvas.width,canvas.height,'black');
if(showingWinScreen) {
canvasContext.fillStyle = 'white';
canvasContext.font="30px sans-serif";
if(player1Score >= WINNING_SCORE) {
canvasContext.fillText("Player Won!", 500,200);
} else if(player2Score >= WINNING_SCORE) {
canvasContext.fillText("COMPUTER Won!", 500,200);
}
canvasContext.fillText("Click to continue", 500,500);
return;
}
drawNet();
// left player paddle
colorRect(PADDLE_OFFSET,paddle1Y,PADDLE_THICKNESS,PADDLE_HEIGHT,'white');
// right player paddle
colorRect(canvas.width-PADDLE_THICKNESS-PADDLE_OFFSET,paddle2Y,PADDLE_THICKNESS,PADDLE_HEIGHT,'white');
// draw the ball
colorCircle(ballX, ballY,10,'green');
canvasContext.fillStyle='white';
canvasContext.font="20px sans-serif"
canvasContext.fillText('player: '+player1Score, 100,100);
canvasContext.fillText('computer: '+player2Score, canvas.width -300,100);
}
function colorCircle(centerX, centerY, radius, drawColor) {
canvasContext.fillStyle = 'green';
canvasContext.beginPath();
canvasContext.arc(centerX,centerY,radius,0,Math.PI*2,true);
canvasContext.fill();
}
//rectangular shape .fillRect(x,y,width,height) in px;
function colorRect(leftX,topY,width,height,drawColor) {
canvasContext.fillStyle = drawColor;
canvasContext.fillRect(leftX,topY,width,height);
}
</script>