59 lines
1.5 KiB
JavaScript
59 lines
1.5 KiB
JavaScript
/**
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* @author hughes
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*/
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THREE.CircleGeometry = function ( radius, segments, thetaStart, thetaLength ) {
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THREE.Geometry.call( this );
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this.type = 'CircleGeometry';
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this.parameters = {
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radius: radius,
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segments: segments,
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thetaStart: thetaStart,
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thetaLength: thetaLength
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};
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radius = radius || 50;
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segments = segments !== undefined ? Math.max( 3, segments ) : 8;
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thetaStart = thetaStart !== undefined ? thetaStart : 0;
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thetaLength = thetaLength !== undefined ? thetaLength : Math.PI * 2;
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var i, uvs = [],
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center = new THREE.Vector3(), centerUV = new THREE.Vector2( 0.5, 0.5 );
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this.vertices.push(center);
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uvs.push( centerUV );
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for ( i = 0; i <= segments; i ++ ) {
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var vertex = new THREE.Vector3();
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var segment = thetaStart + i / segments * thetaLength;
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vertex.x = radius * Math.cos( segment );
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vertex.y = radius * Math.sin( segment );
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this.vertices.push( vertex );
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uvs.push( new THREE.Vector2( ( vertex.x / radius + 1 ) / 2, ( vertex.y / radius + 1 ) / 2 ) );
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}
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var n = new THREE.Vector3( 0, 0, 1 );
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for ( i = 1; i <= segments; i ++ ) {
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this.faces.push( new THREE.Face3( i, i + 1, 0, [ n.clone(), n.clone(), n.clone() ] ) );
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this.faceVertexUvs[ 0 ].push( [ uvs[ i ].clone(), uvs[ i + 1 ].clone(), centerUV.clone() ] );
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}
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this.computeFaceNormals();
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this.boundingSphere = new THREE.Sphere( new THREE.Vector3(), radius );
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};
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THREE.CircleGeometry.prototype = Object.create( THREE.Geometry.prototype );
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THREE.CircleGeometry.prototype.constructor = THREE.CircleGeometry;
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