Pembahasan kali ini saya akan memberikan sedikit pengetahuan tentang cara membuat game sederhana memecahkan bola salju dengan menggunakan bahasa pemrograman javascript.Pertama yang anda lakukan adalah membuka Software Text editor anda seperti Notepad,Notepad++,Sublem Text,Atom,Visual Studio code dan yang lain-lain.Di Pembahasan kali ini saya akan menggunakan Software Text Editor Visual Studio code,mengapa saya menggunakan software ini?.
Software visual studio code memilki beberapa keunggulan dan beberapa fitur yang berbeda dari Software Text Editor yang lainnya.Salah satu keunggulan Software Vs.code adalah sudah support berbagai macam bahasa pemrograman dan sangat cocok digunakan bagi anda yang lagi belajar coding .Bahkan sofware Vs code ini banyak digunakan oleh programer dan developer tingkat profesional.
Jika anda belum memiliki software Vs code ini,silahkan download di situs website resminya https://code.visualstudio.com/download.Berikut Tampilan atau Gambar Software Vs.code setelah anda mendownload dan menginstalnya di perangkat pc atau perangkat laptop anda:
Setelah anda berhasil menginstalnnya maka langkah selanjutnya silahkan tuliskan code berikut ini:
<!DOCTYPE HTML>
<html lang="en">
<head>
<meta name="viewport" content="width=device-width,
user-scalable=no, initial-scale=1, maximum-scale=1, user-scalable=0" />
<meta name="apple-mobile-web-app-capable" content="yes" />
<meta name="apple-mobile-web-app-status-bar-style" content="black-translucent" />
<style type="text/css">
body { margin: 0; padding: 0; background: #000;}
canvas { display: block; margin: 0 auto; background: #fff; }
</style>
</head>
<body>
<canvas></canvas>
<script>
// http://paulirish.com/2011/requestanimationframe-for-smart-animating
// shim layer with setTimeout fallback
window.requestAnimFrame = (function(){
return window.requestAnimationFrame ||
window.webkitRequestAnimationFrame ||
window.mozRequestAnimationFrame ||
window.oRequestAnimationFrame ||
window.msRequestAnimationFrame ||
function( callback ){
window.setTimeout(callback, 1000 / 60);
};
})();
// namespace our game
var POP = {
// set up some inital values
WIDTH: 320,
HEIGHT: 480,
scale: 1,
// the position of the canvas
// in relation to the screen
offset: {top: 0, left: 0},
// store all bubble, touches, particles etc
entities: [],
// the amount of game ticks until
// we spawn a bubble
nextBubble: 100,
// for tracking player's progress
score: {
taps: 0,
hit: 0,
escaped: 0,
accuracy: 0
},
// we'll set the rest of these
// in the init function
RATIO: null,
currentWidth: null,
currentHeight: null,
canvas: null,
ctx: null,
ua: null,
android: null,
ios: null,
init: function() {
// the proportion of width to height
POP.RATIO = POP.WIDTH / POP.HEIGHT;
// these will change when the screen is resize
POP.currentWidth = POP.WIDTH;
POP.currentHeight = POP.HEIGHT;
// this is our canvas element
POP.canvas = document.getElementsByTagName('canvas')[0];
// it's important to set this
// otherwise the browser will
// default to 320x200
POP.canvas.width = POP.WIDTH;
POP.canvas.height = POP.HEIGHT;
// the canvas context allows us to
// interact with the canvas api
POP.ctx = POP.canvas.getContext('2d');
// we need to sniff out android & ios
// so we can hide the address bar in
// our resize function
POP.ua = navigator.userAgent.toLowerCase();
POP.android = POP.ua.indexOf('android') > -1 ? true : false;
POP.ios = ( POP.ua.indexOf('iphone') > -1 || POP.ua.indexOf('ipad') > -1 ) ? true : false;
// set up our wave effect
// basically, a series of overlapping circles
// across the top of screen
POP.wave = {
x: -25, // x coord of first circle
y: -40, // y coord of first circle
r: 50, // circle radius
time: 0, // we'll use this in calculating the sine wave
offset: 0 // this will be the sine wave offset
};
// calculate how many circles we need to
// cover the screen width
POP.wave.total = Math.ceil(POP.WIDTH / POP.wave.r) + 1;
// listen for clicks
window.addEventListener('click', function(e) {
e.preventDefault();
POP.Input.set(e);
}, false);
// listen for touches
window.addEventListener('touchstart', function(e) {
e.preventDefault();
// the event object has an array
// called touches, we just want
// the first touch
POP.Input.set(e.touches[0]);
}, false);
window.addEventListener('touchmove', function(e) {
// we're not interested in this
// but prevent default behaviour
// so the screen doesn't scroll
// or zoom
e.preventDefault();
}, false);
window.addEventListener('touchend', function(e) {
// as above
e.preventDefault();
}, false);
// we're ready to resize
POP.resize();
POP.loop();
},
resize: function() {
POP.currentHeight = window.innerHeight;
// resize the width in proportion
// to the new height
POP.currentWidth = POP.currentHeight * POP.RATIO;
// this will create some extra space on the
// page, allowing us to scroll pass
// the address bar, and thus hide it.
if (POP.android || POP.ios) {
document.body.style.height = (window.innerHeight + 50) + 'px';
}
// set the new canvas style width & height
// note: our canvas is still 320x480 but
// we're essentially scaling it with CSS
POP.canvas.style.width = POP.currentWidth + 'px';
POP.canvas.style.height = POP.currentHeight + 'px';
// the amount by which the css resized canvas
// is different to the actual (480x320) size.
POP.scale = POP.currentWidth / POP.WIDTH;
// position of canvas in relation to
// the screen
POP.offset.top = POP.canvas.offsetTop;
POP.offset.left = POP.canvas.offsetLeft;
// we use a timeout here as some mobile
// browsers won't scroll if there is not
// a small delay
window.setTimeout(function() {
window.scrollTo(0,1);
}, 1);
},
// this is where all entities will be moved
// and checked for collisions etc
update: function() {
var i,
checkCollision = false; // we only need to check for a collision
// if the user tapped on this game tick
// decrease our nextBubble counter
POP.nextBubble -= 1;
// if the counter is less than zero
if (POP.nextBubble < 0) {
// put a new instance of bubble into our entities array
POP.entities.push(new POP.Bubble());
// reset the counter with a random value
POP.nextBubble = ( Math.random() * 100 ) + 100;
}
// spawn a new instance of Touch
// if the user has tapped the screen
if (POP.Input.tapped) {
// keep track of taps; needed to
// calculate accuracy
POP.score.taps += 1;
// add a new touch
POP.entities.push(new POP.Touch(POP.Input.x, POP.Input.y));
// set tapped back to false
// to avoid spawning a new touch
// in the next cycle
POP.Input.tapped = false;
checkCollision = true;
}
// cycle through all entities and update as necessary
for (i = 0; i < POP.entities.length; i += 1) {
POP.entities[i].update();
if (POP.entities[i].type === 'bubble' && checkCollision) {
hit = POP.collides(POP.entities[i],
{x: POP.Input.x, y: POP.Input.y, r: 7});
if (hit) {
// spawn an exposion
for (var n = 0; n < 5; n +=1 ) {
POP.entities.push(new POP.Particle(
POP.entities[i].x,
POP.entities[i].y,
2,
// random opacity to spice it up a bit
'rgba(255,255,255,'+Math.random()*1+')'
));
}
POP.score.hit += 1;
}
POP.entities[i].remove = hit;
}
// delete from array if remove property
// flag is set to true
if (POP.entities[i].remove) {
POP.entities.splice(i, 1);
}
}
// update wave offset
// feel free to play with these values for
// either slower or faster waves
POP.wave.time = new Date().getTime() * 0.002;
POP.wave.offset = Math.sin(POP.wave.time * 0.8) * 5;
// calculate accuracy
POP.score.accuracy = (POP.score.hit / POP.score.taps) * 100;
POP.score.accuracy = isNaN(POP.score.accuracy) ?
0 :
~~(POP.score.accuracy); // a handy way to round floats
},
// this is where we draw all the entities
render: function() {
var i;
POP.Draw.rect(0, 0, POP.WIDTH, POP.HEIGHT, '#036');
// display snazzy wave effect
for (i = 0; i < POP.wave.total; i++) {
POP.Draw.circle(
POP.wave.x + POP.wave.offset + (i * POP.wave.r),
POP.wave.y,
POP.wave.r,
'#fff');
}
// cycle through all entities and render to canvas
for (i = 0; i < POP.entities.length; i += 1) {
POP.entities[i].render();
}
// display scores
POP.Draw.text('Hit: ' + POP.score.hit, 20, 30, 14, '#fff');
POP.Draw.text('Escaped: ' + POP.score.escaped, 20, 50, 14, '#fff');
POP.Draw.text('Accuracy: ' + POP.score.accuracy + '%', 20, 70, 14, '#fff');
},
// the actual loop
// requests animation frame
// then proceeds to update
// and render
loop: function() {
requestAnimFrame( POP.loop );
POP.update();
POP.render();
}
};
// checks if two entties are touching
POP.collides = function(a, b) {
var distance_squared = ( ((a.x - b.x) * (a.x - b.x)) +
((a.y - b.y) * (a.y - b.y)));
var radii_squared = (a.r + b.r) * (a.r + b.r);
if (distance_squared < radii_squared) {
return true;
} else {
return false;
}
};
// abstracts various canvas operations into
// standalone functions
POP.Draw = {
clear: function() {
POP.ctx.clearRect(0, 0, POP.WIDTH, POP.HEIGHT);
},
rect: function(x, y, w, h, col) {
POP.ctx.fillStyle = col;
POP.ctx.fillRect(x, y, w, h);
},
circle: function(x, y, r, col) {
POP.ctx.fillStyle = col;
POP.ctx.beginPath();
POP.ctx.arc(x + 5, y + 5, r, 0, Math.PI * 2, true);
POP.ctx.closePath();
POP.ctx.fill();
},
text: function(string, x, y, size, col) {
POP.ctx.font = 'bold '+size+'px Monospace';
POP.ctx.fillStyle = col;
POP.ctx.fillText(string, x, y);
}
};
POP.Input = {
x: 0,
y: 0,
tapped :false,
set: function(data) {
this.x = (data.pageX - POP.offset.left) / POP.scale;
this.y = (data.pageY - POP.offset.top) / POP.scale;
this.tapped = true;
}
};
POP.Touch = function(x, y) {
this.type = 'touch'; // we'll need this later
this.x = x; // the x coordinate
this.y = y; // the y coordinate
this.r = 5; // the radius
this.opacity = 1; // inital opacity. the dot will fade out
this.fade = 0.05; // amount by which to fade on each game tick
// this.remove = false; // flag for removing this entity. POP.update
// will take care of this
this.update = function() {
// reduct the opacity accordingly
this.opacity -= this.fade;
// if opacity if 0 or less, flag for removal
this.remove = (this.opacity < 0) ? true : false;
};
this.render = function() {
POP.Draw.circle(this.x, this.y, this.r, 'rgba(255,0,0,'+this.opacity+')');
};
};
POP.Bubble = function() {
this.type = 'bubble';
this.r = (Math.random() * 20) + 10;
this.speed = (Math.random() * 3) + 1;
this.x = (Math.random() * (POP.WIDTH) - this.r);
this.y = POP.HEIGHT + (Math.random() * 100) + 100;
// the amount by which the bubble
// will move from side to side
this.waveSize = 5 + this.r;
// we need to remember the original
// x position for our sine wave calculation
this.xConstant = this.x;
this.remove = false;
this.update = function() {
// a sine wave is commonly a function of time
var time = new Date().getTime() * 0.002;
this.y -= this.speed;
// the x coord to follow a sine wave
this.x = this.waveSize * Math.sin(time) + this.xConstant;
// if offscreen flag for removal
if (this.y < -10) {
POP.score.escaped += 1; // update score
this.remove = true;
}
};
this.render = function() {
POP.Draw.circle(this.x, this.y, this.r, 'rgba(255,255,255,1)');
};
};
POP.Particle = function(x, y,r, col) {
this.x = x;
this.y = y;
this.r = r;
this.col = col;
// determines whether particle will
// travel to the right of left
// 50% chance of either happening
this.dir = (Math.random() * 2 > 1) ? 1 : -1;
// random values so particles do no
// travel at the same speeds
this.vx = ~~(Math.random() * 4) * this.dir;
this.vy = ~~(Math.random() * 7);
this.remove = false;
this.update = function() {
// update coordinates
this.x += this.vx;
this.y += this.vy;
// increase velocity so particle
// accelerates off screen
this.vx *= 0.99;
this.vy *= 0.99;
// adding this negative amount to the
// y velocity exerts an upward pull on
// the particle, as if drawn to the
// surface
this.vy -= 0.25;
// offscreen
if (this.y < 0) {
this.remove = true;
}
};
this.render = function() {
POP.Draw.circle(this.x, this.y, this.r, this.col);
};
};
window.addEventListener('load', POP.init, false);
window.addEventListener('resize', POP.resize, false);
</script>
</body>
</html>
Setelah anda menuliskan code tersebut maka langkah selanjutnya adalah save atau simpan codingan tersebut di folder penyimpanan yang anda inginkan.Kemudian RUN atau jalankan codingan tersebut,maka hasilnya seperti Tampilan berikut ini:
SELAMAT MENCOBA!!!😇
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