Alright! Let’s start with a canvas.
Copy & Paste the code below into your code editor.
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1.0"/>
<style>
canvas {
border: 1px solid #d3d3d3;
background-color: #f1f1f1;
}
</style>
</head>
<body onload="startGame()">
<script>
function startGame() {
myGameArea.start();
}
var myGameArea = {
canvas : document.createElement("canvas"),
start : function() {
this.canvas.width = 480;
this.canvas.height = 270;
this.context = this.canvas.getContext("2d");
document.body.insertBefore(this.canvas, document.body.childNodes[0]);
}
}
</script>
<p>We have created a game area! (or at least an empty canvas)</p>
</body>
</html>
Add this just above the < / script > line
var myUpBtn;
myUpBtn = new component(30, 30, "blue", 50, 10);
window.addEventListener('mousedown', function (e) {
myGameArea.x = e.pageX;
myGameArea.y = e.pageY;
})
window.addEventListener('mouseup', function (e) {
myGameArea.x = false;
myGameArea.y = false;
})
window.addEventListener('touchstart', function (e) {
myGameArea.x = e.pageX;
myGameArea.y = e.pageY;
})
window.addEventListener('touchend', function (e) {
myGameArea.x = false;
myGameArea.y = false;
})
this.clicked = function() {
var myleft = this.x;
var myright = this.x + (this.width);
var mytop = this.y;
var mybottom = this.y + (this.height);
var clicked = true;
if ((mybottom < myGameArea.y) || (mytop > myGameArea.y)
|| (myright < myGameArea.x) || (myleft > myGameArea.x)) {
clicked = false;
}
return clicked;
}
if (myGameArea.x && myGameArea.y) {
if (myUpBtn.clicked()) {
myGamePiece.y -= 1;
}
if (myDownBtn.clicked()) {
myGamePiece.y += 1;
}
if (myLeftBtn.clicked()) {
myGamePiece.x += -1;
}
if (myRightBtn.clicked()) {
myGamePiece.x += 1;
}
}
myUpBtn.update();
myDownBtn.update();
myLeftBtn.update();
myRightBtn.update();
This will allow us to test our code out! And experiment with moving components!