fireball/lib/helpers/PolarGridHelper.js

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2018-12-25 13:59:22 +00:00
/**
* @author mrdoob / http://mrdoob.com/
* @author Mugen87 / http://github.com/Mugen87
* @author Hectate / http://www.github.com/Hectate
*/
import { LineSegments } from '../objects/LineSegments.js';
import { VertexColors } from '../constants.js';
import { LineBasicMaterial } from '../materials/LineBasicMaterial.js';
import { Float32BufferAttribute } from '../core/BufferAttribute.js';
import { BufferGeometry } from '../core/BufferGeometry.js';
import { Color } from '../math/Color.js';
function PolarGridHelper( radius, radials, circles, divisions, color1, color2 ) {
radius = radius || 10;
radials = radials || 16;
circles = circles || 8;
divisions = divisions || 64;
color1 = new Color( color1 !== undefined ? color1 : 0x444444 );
color2 = new Color( color2 !== undefined ? color2 : 0x888888 );
var vertices = [];
var colors = [];
var x, z;
var v, i, j, r, color;
// create the radials
for ( i = 0; i <= radials; i ++ ) {
v = ( i / radials ) * ( Math.PI * 2 );
x = Math.sin( v ) * radius;
z = Math.cos( v ) * radius;
vertices.push( 0, 0, 0 );
vertices.push( x, 0, z );
color = ( i & 1 ) ? color1 : color2;
colors.push( color.r, color.g, color.b );
colors.push( color.r, color.g, color.b );
}
// create the circles
for ( i = 0; i <= circles; i ++ ) {
color = ( i & 1 ) ? color1 : color2;
r = radius - ( radius / circles * i );
for ( j = 0; j < divisions; j ++ ) {
// first vertex
v = ( j / divisions ) * ( Math.PI * 2 );
x = Math.sin( v ) * r;
z = Math.cos( v ) * r;
vertices.push( x, 0, z );
colors.push( color.r, color.g, color.b );
// second vertex
v = ( ( j + 1 ) / divisions ) * ( Math.PI * 2 );
x = Math.sin( v ) * r;
z = Math.cos( v ) * r;
vertices.push( x, 0, z );
colors.push( color.r, color.g, color.b );
}
}
var geometry = new BufferGeometry();
geometry.addAttribute( 'position', new Float32BufferAttribute( vertices, 3 ) );
geometry.addAttribute( 'color', new Float32BufferAttribute( colors, 3 ) );
var material = new LineBasicMaterial( { vertexColors: VertexColors } );
LineSegments.call( this, geometry, material );
}
PolarGridHelper.prototype = Object.create( LineSegments.prototype );
PolarGridHelper.prototype.constructor = PolarGridHelper;
export { PolarGridHelper };