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n2.html
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<!DOCTYPE html>
<html>
<head>
<meta charset=utf-8>
<title>three.js</title>
<style>
body { margin: 0; }
canvas { width: 100%; height: 100% }
</style>
</head>
<body>
<script src="../js/three.js"></script>
<script src="../js/helpers.js"></script>
<script>
/*
circles along the golden spiral
*/
var debugging = true;
//
// FIND OUR ORIGIN
var bounds = 100; // pixels from the edge of the window
var half_window_w = window.innerWidth / 2;
var half_window_h = window.innerHeight / 2;
var origin = new THREE.Vector3();
if (debugging) {
console.log( "WINDOW: " + half_window_w + "x" + half_window_h );
console.log( "BOUNDS: " + bounds );
console.log( "ORIGIN: " + origin.x.toString() + "x" + origin.y.toString() );
}
// okay that wasn't so bad
var scene = new THREE.Scene();
//scene.background = new THREE.Color( 'white' );
var camera = new THREE.PerspectiveCamera(
75,
window.innerWidth / window.innerHeight,
1,
1000
);
camera.position.set( 0, 0, 750 );
camera.lookAt( new THREE.Vector3() );
var renderer = new THREE.WebGLRenderer();
renderer.setSize( window.innerWidth, window.innerHeight );
renderer.autoClear = false;
document.body.appendChild( renderer.domElement );
var num_shapes = getRandomInt( bounds / 10, bounds / 3 );
if (debugging) { console.log( num_shapes + " shapes" ); }
var colors = [
'#3A3335',
'#D81E5B',
'#F0544F',
'#FDF0D5',
'#C6D8D3'
];
var num_segments, random_color, angle, angle_incr, mesh;
var outer_rad = window.innerWidth * 0.8;
angle = getRandomInt(3, 60);
angle_incr = angle * Math.PI/180; // degrees, converted to radians
num_segments = getRandomInt(bounds / 5, bounds);
var transparency = 0.5;
var ratio, angle, spiral_rad, x, y, i, p, p0, w;
var ring, material, mesh;
for (var l = 0; l < num_segments; l++) {
if (debugging) { console.log("@" + l.toString()); }
random_color = colors[Math.floor(Math.random() * colors.length)];
if (debugging) { console.log(random_color); }
ratio = l / num_segments;
angle = l / angle_incr;
spiral_rad = ratio * outer_rad;
x = Math.cos(angle) * spiral_rad;
y = Math.sin(angle) * spiral_rad;
// so i need a circle that goes through 0,0 and x,y
// so i need to know the distance between those two points
p = new THREE.Vector3(x, y);
p0 = p.distanceTo(origin);
w = getRandomInt(3, p0 / 2);
ring = new THREE.RingGeometry(p0 - w, p0, 32);
transparency = calculateTransparency(l);
material = new THREE.LineBasicMaterial( {
color: random_color,
transparent: true,
opacity: transparency
});
// okay so now I should be able to put that ring somewhere, right?
mesh = new THREE.Mesh( ring, material );
mesh.position.x = x - (p0/2);
mesh.position.y = y - (p0/2);
scene.add( mesh );
}
renderer.render( scene, camera );
</script>
</body>
</html>