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- <html>
- <canvas id="gameCanvas" width="800" height="600">
- </canvas>
- <script>
- //Background Parameter
- var canvas;
- var canvasContext;
- //Ball Parameter
- var ballX = 50;
- var ballSpeedX = 10;
- var ballY = 50;
- var ballSpeedY = 4;
- //Spieler Platte Parameter
- var paddle1Y = 250;
- var paddle2Y = 250;
- const PADDLE_HEIGHT = 100;
- const PADDLE_THICKNESS = 10;
- //HUD Parameter
- var player1Score = 0;
- var player2Score = 0;
- const WINNING_SCORE = 3;
- var showingWinScreen = false;
- function handleMouseClick(evt){
- if(showingWinScreen == true) {
- player1Score = 0;
- player2Score = 0;
- showingWinScreen = false;
- }
- }
- 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
- };
- }
- window.onload=function(){
- canvas =document.getElementById('gameCanvas');
- canvasContext = canvas.getContext('2d');
- var framesPerSecond = 30;
- setInterval(function(){
- moveEverything();
- drawEverything();
- },1000/framesPerSecond);
- canvas.addEventListener('mousemove',
- function(evt) {
- var mousePos = calculateMousePos(evt);
- paddle1Y = mousePos.y-(PADDLE_HEIGHT/2);
- });
- canvas.addEventListener('mousedown',handleMouseClick);
- }
- //KI
- function computerMovement(){
- var paddle2YCenter = paddle2Y + (PADDLE_HEIGHT/2);
- if(paddle2YCenter < ballY - 35) {
- paddle2Y += 6;
- }else if(paddle2YCenter > ballY + 35){
- paddle2Y -= 6;
- }
- }
- function ballReset() {
- if(player1Score >= WINNING_SCORE ||
- player2Score >= WINNING_SCORE) {
- showingWinScreen = true;
- }
- ballX = canvas.width/2;
- ballY = canvas.height/2;
- ballSpeedX = -ballSpeedX;
- }
- function moveEverything(){
- if (showingWinScreen == true) {
- return;
- }
- computerMovement();
- ballX += ballSpeedX;
- ballY += ballSpeedY;
- //rechter Spieler trigger
- if(ballX > canvas.width){
- if(ballY > paddle2Y &&
- ballY < paddle2Y+PADDLE_HEIGHT) {
- ballSpeedX = -ballSpeedX;
- //winkelSpeed
- var deltaY =ballY - (paddle2Y+PADDLE_HEIGHT/2);
- ballSpeedY = deltaY *0.35;
- } else{
- player1Score++;
- ballReset();
- }
- }
- //linker Spieler trigger
- if(ballX < 0){
- if(ballY > paddle1Y &&
- ballY < paddle1Y+PADDLE_HEIGHT) {
- ballSpeedX = -ballSpeedX;
- //winkelSpeed
- var deltaY =ballY - (paddle1Y+PADDLE_HEIGHT/2);
- ballSpeedY = deltaY *0.35;
- } else{
- player2Score++;
- ballReset();
- }
- }
- //Y-Richtung
- if(ballY > canvas.height){
- ballSpeedY = -ballSpeedY;
- }
- if(ballY < 0){
- ballSpeedY = -ballSpeedY;
- }
- }
- //DRAW
- function drawNet(){
- for (var i=0;i<canvas.height; i+=40) {
- colorRect(canvas.width/2 - 1,i,2,20,'white');
- }
- }
- function drawEverything(){
- //Hintergrund
- colorRect(0,0,canvas.width,canvas.height,'black');
- // Logik Gewinner
- if (showingWinScreen == true) {
- canvasContext.fillStyle = 'red';
- if(player1Score >= WINNING_SCORE) {
- canvasContext.fillText("Linker Spieler gewinnt!!!",350,300);
- }
- else if (player2Score >= WINNING_SCORE) {
- canvasContext.fillText("Rechter Spieler gewinnt!!!",350,300);
- }
- canvasContext.fillText("Klicken zum weiterspielen!",350,500);
- return;
- }
- //Mittellinie
- drawNet();
- //linker Spieler
- colorRect(0,paddle1Y,PADDLE_THICKNESS,PADDLE_HEIGHT,'white');
- //rechter Spieler
- colorRect(canvas.width-PADDLE_THICKNESS,paddle2Y,PADDLE_THICKNESS,PADDLE_HEIGHT,'white');
- //Ball
- colorCircle(ballX,ballY,PADDLE_THICKNESS,'red');
- //HUD
- canvasContext.fillText(player1Score,100,100);
- canvasContext.fillText(player2Score,canvas.width-100,100);
- }
- //Ball draw Funktion
- function colorCircle(centerX,centerY,radius,drawColor){
- canvasContext.fillStyle = drawColor
- canvasContext.beginPath();
- canvasContext.arc(centerX,centerY,radius,0,Math.PI*2,true);
- canvasContext.fill();
- }
- //Spieler und Hintergrund
- function colorRect(leftX,topY,width,height,drawColor) {
- canvasContext.fillStyle = drawColor;
- canvasContext.fillRect(leftX,topY,width,height);
- }
- </script>
- </html>
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