Starfield using KineticJS

Developer
A S P
Size
3,512 Kb
Views
4,048
  1. Starfield using KineticJS Previews
  2. Starfield using KineticJS HTML Codes
  3. Starfield using KineticJS CSS Codes
  4. Starfield using KineticJS JS Codes

How do I make an starfield using kineticjs?

Starfield simulation using KineticJS.. What is a starfield using kineticjs? How do you make a starfield using kineticjs? This script and codes were developed by A S P on 15 January 2023, Sunday.

Starfield using KineticJS Previews
IQ Test

Starfield using KineticJS - Script Codes HTML Codes

<!DOCTYPE html>
<html >
<head> <meta charset="UTF-8"> <title>Starfield using KineticJS</title> <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/meyer-reset/2.0/reset.min.css"> <link rel="stylesheet" href="css/style.css">
</head>
<body> <div id="container" class="centered"></div>
<div id="buttonContainer" class="centered"> <input type="button" id="start" value="Start" /> <input type="button" id="stop" value="Stop" />
</div> <script src='http://cdnjs.cloudflare.com/ajax/libs/jquery/2.1.3/jquery.min.js'></script>
<script src='http://cdnjs.cloudflare.com/ajax/libs/kineticjs/5.0.1/kinetic.min.js'></script> <script src="js/index.js"></script>
</body>
</html>

Starfield using KineticJS - Script Codes CSS Codes

#container
{ width: 800px; height: 500px; border: 0px solid #00f; padding: 0px; box-shadow: 10px 10px 5px #888888; margin-top: 10px; background-color: #000;
}
#buttonContainer
{ text-align: center; margin-top: 15px;
}
.centered
{ margin-right: auto; margin-left: auto;
}

Starfield using KineticJS - Script Codes JS Codes

function Utils()
{
}
Utils.prototype.getRand = function(min, max)
{	return Math.floor(Math.random() * (max - min + 1)) + min;
};
var utils = new Utils();
/////////////////////////////////////////////////////////////
function Star() { this.maxX = 800; this.maxY = 800; this.maxZ = 10; this.minX = -800; this.minY = -800; this.minZ = 1; this.midX = 200; this.midY = 200; this.kstar = false; this.speed = 0.3; // the lower the bigger, not 0 this.starSize = 1.25;
};
Star.prototype.init = function(params)
{ for(var key in params) { if (typeof this[key] !== 'undefined') this[key] = params[key]; } this.setPos(); this.createKStar();
};
// randomly choose x, y, z coords
Star.prototype.setPos = function()
{ this.curX = utils.getRand(this.minX, this.maxX); this.curY = utils.getRand(this.minY, this.maxY); this.curZ = utils.getRand(this.minZ, this.maxZ); //console.log(this.toString());
};
Star.prototype.move = function()
{ this.curZ -= this.speed; // reached destination, clear for now if (this.curZ <= 0) { this.setPos(); //console.log('Reset star'); } // set position this.kstar.setX(this.getDrawX()); this.kstar.setY(this.getDrawY()); // set color // | 0 replaces slow parseInt function var color = ((this.maxZ-this.curZ)/this.maxZ * 255) | 0; //console.log('Color: '+color); //this.kstar.fillRed(color); //this.kstar.fillGreen(color); //this.kstar.fillBlue(color); // set opacity var opacity = Math.round((this.maxZ-this.curZ)/this.maxZ*100)/100; this.kstar.fillAlpha(opacity); // set size var hsize = Math.round((this.maxZ-this.curZ)/this.maxZ*100/(this.maxZ*this.starSize)); this.kstar.height(hsize); this.kstar.width(hsize); //console.log('Size: '+hsize);
};
// perspective projection
// +0.5 to offset canvas auto-anti-aliasing
Star.prototype.getDrawX = function()
{ var dx = ((this.curX / this.curZ) + this.midX)+0.5; //console.log('Draw x:'+dx) return dx;
};
Star.prototype.getDrawY = function()
{ var dy = ((this.curY / this.curZ) + this.midY)+0.5; //console.log('Draw y:'+dy) return dy;
};
Star.prototype.createKStar = function()
{ this.kstar = new Kinetic.Circle({ x: this.getDrawX(), y: this.getDrawY(), width: 1, height: 1, fillRed: 255, fillGreen: 255, fillBlue: 255 });
};
Star.prototype.getKStar = function()
{ return this.kstar;
}
Star.prototype.toString = function()
{ return "Current x: "+this.curX+" y: "+this.curY+" z: "+this.curZ " Speed: "+this.speed;
};
////////////////////////////////////////////////////
function Starfield()
{ // work space area this.height = 500; this.width = 800; this.depthmin = 5; this.depthmax = 15; this.heightmid = 200; this.widthmid = 200; this.speed = 0.3; // star tracking // total number of stars to add this.startotal = 500; // number of stars to add at a time this.starincrement = 50; // tracking current stars in field this.stars = []; // Kinetic objects this.stage = null; this.layer = null; this.anim = null;
};
// kineticJS info:
// stroke half within the item width, half outside
// odd stroke number results in anti-aliasing round up size
// item can run off screen
Starfield.prototype.init = function(params)
{ var _self = this; // add params that we already defined for(var key in params) { if (typeof this[key] !== 'undefined') this[key] = params[key]; } this.stars = []; this.stage = new Kinetic.Stage({ container: 'container', width: this.width, height: this.height }); this.layer = new Kinetic.Layer(); // add the layer to the stage this.stage.add(this.layer); this.widthmid = Math.floor(this.width/2); this.heightmid = Math.floor(this.height/2); $("#stop").click(function(){ _self.stop(); }); $("#start").click(function(){ _self.animate(); });
};
Starfield.prototype.stop = function()
{ if (this.anim) { console.log('stop'); this.anim.stop(); this.anim = false; this.stars = []; this.layer.removeChildren(); }
};
Starfield.prototype.addStars = function()
{ var _self = this; // check if we have added all the stars required if (this.startotal <= this.stars.length) return true; console.log('adding stars: '+this.stars.length) for (var i =0; i < this.starincrement; i++) { var star = new Star(); star.init({ midX: this.widthmid, midY: this.heightmid, maxX: this.width*2, minX: -(this.width*2), maxY: this.height*2, minY: -(this.height*2), minZ: this.depthmin, maxZ: this.depthmax, speed: this.speed }); var kstar = star.getKStar(); this.layer.add(kstar); this.stars.push(star); } setTimeout(function(){ _self.addStars(); }, 500);
};
Starfield.prototype.animate = function()
{ var _self = this; console.log('start'); if (this.anim) this.stop(); this.addStars(); this.anim = new Kinetic.Animation(function(frame) { for (var i = 0; i < _self.stars.length; i++) { var star = _self.stars[i]; if (!star) continue; star.move(); } }, _self.layer); this.anim.start();
};
/////////////////////////////////////////////////////////
var starfield = new Starfield();
starfield.init();
starfield.animate();
Starfield using KineticJS - Script Codes
Starfield using KineticJS - Script Codes
Home Page Home
Developer A S P
Username asp
Uploaded January 15, 2023
Rating 3
Size 3,512 Kb
Views 4,048
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