[28897] | 1 | /**
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| 2 | * @author hughes
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| 3 | */
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| 4 |
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| 5 | THREE.CircleGeometry = function ( radius, segments, thetaStart, thetaLength ) {
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| 6 |
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| 7 | THREE.Geometry.call( this );
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| 8 |
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| 9 | this.radius = radius = radius || 50;
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| 10 | this.segments = segments = segments !== undefined ? Math.max( 3, segments ) : 8;
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| 11 |
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| 12 | this.thetaStart = thetaStart = thetaStart !== undefined ? thetaStart : 0;
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| 13 | this.thetaLength = thetaLength = thetaLength !== undefined ? thetaLength : Math.PI * 2;
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| 14 |
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| 15 | var i, uvs = [],
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| 16 | center = new THREE.Vector3(), centerUV = new THREE.Vector2( 0.5, 0.5 );
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| 17 |
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| 18 | this.vertices.push(center);
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| 19 | uvs.push( centerUV );
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| 20 |
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| 21 | for ( i = 0; i <= segments; i ++ ) {
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| 22 |
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| 23 | var vertex = new THREE.Vector3();
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| 24 | var segment = thetaStart + i / segments * thetaLength;
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| 25 |
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| 26 | vertex.x = radius * Math.cos( segment );
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| 27 | vertex.y = radius * Math.sin( segment );
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| 28 |
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| 29 | this.vertices.push( vertex );
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| 30 | uvs.push( new THREE.Vector2( ( vertex.x / radius + 1 ) / 2, ( vertex.y / radius + 1 ) / 2 ) );
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| 31 |
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| 32 | }
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| 33 |
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| 34 | var n = new THREE.Vector3( 0, 0, 1 );
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| 35 |
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| 36 | for ( i = 1; i <= segments; i ++ ) {
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| 37 |
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| 38 | var v1 = i;
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| 39 | var v2 = i + 1 ;
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| 40 | var v3 = 0;
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| 41 |
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| 42 | this.faces.push( new THREE.Face3( v1, v2, v3, [ n.clone(), n.clone(), n.clone() ] ) );
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| 43 | this.faceVertexUvs[ 0 ].push( [ uvs[ i ].clone(), uvs[ i + 1 ].clone(), centerUV.clone() ] );
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| 44 |
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| 45 | }
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| 46 |
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| 47 | this.computeCentroids();
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| 48 | this.computeFaceNormals();
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| 49 |
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| 50 | this.boundingSphere = new THREE.Sphere( new THREE.Vector3(), radius );
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| 51 |
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| 52 | };
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| 53 |
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| 54 | THREE.CircleGeometry.prototype = Object.create( THREE.Geometry.prototype );
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