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Udemy - Code Your First Game

Last72 2018. 2. 10. 22:12


https://www.udemy.com/code-your-first-game/ Link


A simple, short(2 hour) free programming course that you can take in Udemy. Link is given above. He use notepad and chrome browser to code and test because he only need html5 and javascript to make classic tennis game. Start from yesterday and finish today. Really easy coding but worth experience.


Source code

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<html>
 
<canvas id="gameCanvas" width="800" height="600"></canvas>
<script>
var canvas;
var canvasContext;
var ballX = 400;
var ballY = 300;
var ballSpeedX = 10;
var ballSpeedY = 8;
 
var player1Score = 0;
var player2Score = 0;
const WINNING_SCORE = 3;
 
var showingWinScreen = false;
 
var paddle1Y = 250;
var paddle2Y = 250;
 
const PADDLE_HEIGHT = 100;
const PADDLE_THICKNESS = 10;
 
 
 
 
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(){
    console.log("hello world");
    canvas = document.getElementById('gameCanvas');
    canvasContext = canvas.getContext('2d');
 
    var framesPerSecond = 60;
    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 = 10;
    ballSpeedY = 8;
     
    ballSpeedX = -ballSpeedX;
    ballX = canvas.width/2;
    ballY = canvas.height/2;
 
     
     
     
}
 
 
function computerMovement() {
    var paddle2YCenter = paddle2Y + (PADDLE_HEIGHT/2);
    if (ballX>canvas.width/2){
        if(paddle2YCenter<ballY-35) {
            paddle2Y += 6;
        } else if(paddle2YCenter>ballY+35){
            paddle2Y -= 6;
        }
    }
}
 
function moveEverything() {
 
    if(showingWinScreen) {
        return ;
    }
    computerMovement();
     
    ballX = ballX + ballSpeedX;
    ballY = ballY + ballSpeedY;
 
     
    if(ballX < 10) {
        if(ballY>paddle1Y &&
        ballY<(paddle1Y+PADDLE_HEIGHT)){
            ballSpeedX = -ballSpeedX;
             
             
            var deltaY = ballY
            -(paddle1Y+PADDLE_HEIGHT/2);
            ballSpeedY = deltaY*0.35;
             
            } else {
                player2Score ++; //must before reset
                ballReset();
            };
    }
    if(ballX > canvas.width-10) {
        if(ballY>paddle2Y && ballY<(paddle2Y+PADDLE_HEIGHT)){
            ballSpeedX = -ballSpeedX;
            var deltaY = ballY
            -(paddle2Y+PADDLE_HEIGHT/2);
            ballSpeedY = deltaY*0.35;
             
            } else {
                player1Score ++; //must before reset
                ballReset();
            };
         
         
         
    }
    if(ballY > canvas.height-PADDLE_THICKNESS) {
        ballSpeedY = -ballSpeedY;
    }
    if(ballY < PADDLE_THICKNESS) {
        ballSpeedY = -ballSpeedY;
    }
     
}
 
function drawNet() {
 
    for (var i=0;i<canvas.height;i+=40) {
        colorRect(canvas.width/2-1,i,2,20,'white');
    }
}
 
function drawEverything() {
     
 
    //Black background
    colorRect(0,0,canvas.width,canvas.height,'black');
     
    if(showingWinScreen) {
        canvasContext.fillStyle = 'white';
         
        if (player1Score>= WINNING_SCORE) {
        canvasContext.fillText("Left player won", 300, 200);
         
        } else if(player2Score >= WINNING_SCORE) {
        canvasContext.fillText("Right player won", 480, 200);
         
        }
         
     
        canvasContext.fillStyle = 'white';
        canvasContext.fillText("Click to continue", 380, 500);
         
         
        return ;
    }
    //Left paddle
    colorRect(0,paddle1Y,
    PADDLE_THICKNESS,PADDLE_HEIGHT,'white');
     
    //Right paddle
    colorRect(canvas.width-PADDLE_THICKNESS,
    paddle2Y,PADDLE_THICKNESS,PADDLE_HEIGHT,'white');
     
    colorCircle(ballX, ballY, 10, 'white');
     
    drawNet();
     
    canvasContext.fillstyle = 'white';
    canvasContext.fillText(player1Score, 100, 100);
     
    canvasContext.fillstyle = 'white';
    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, radous, drawColor) {
canvasContext.fillStyle = drawColor;
    canvasContext.beginPath();
    canvasContext.arc(centerX, centerY, radous, 0, Math.PI*2, true);
    canvasContext.fill();
 
}
    </script>
 
</html>


Actual game



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