three 基础库
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( function () {
class LineGeometry extends THREE.LineSegmentsGeometry {
constructor() {
super();
this.type = 'LineGeometry';
}
setPositions( array ) {
// converts [ x1, y1, z1, x2, y2, z2, ... ] to pairs format
var length = array.length - 3;
var points = new Float32Array( 2 * length );
for ( var i = 0; i < length; i += 3 ) {
points[ 2 * i ] = array[ i ];
points[ 2 * i + 1 ] = array[ i + 1 ];
points[ 2 * i + 2 ] = array[ i + 2 ];
points[ 2 * i + 3 ] = array[ i + 3 ];
points[ 2 * i + 4 ] = array[ i + 4 ];
points[ 2 * i + 5 ] = array[ i + 5 ];
}
super.setPositions( points );
return this;
}
setColors( array ) {
// converts [ r1, g1, b1, r2, g2, b2, ... ] to pairs format
var length = array.length - 3;
var colors = new Float32Array( 2 * length );
for ( var i = 0; i < length; i += 3 ) {
colors[ 2 * i ] = array[ i ];
colors[ 2 * i + 1 ] = array[ i + 1 ];
colors[ 2 * i + 2 ] = array[ i + 2 ];
colors[ 2 * i + 3 ] = array[ i + 3 ];
colors[ 2 * i + 4 ] = array[ i + 4 ];
colors[ 2 * i + 5 ] = array[ i + 5 ];
}
super.setColors( colors );
return this;
}
fromLine( line ) {
var geometry = line.geometry;
if ( geometry.isGeometry ) {
console.error( 'THREE.LineGeometry no longer supports Geometry. Use THREE.BufferGeometry instead.' );
return;
} else if ( geometry.isBufferGeometry ) {
this.setPositions( geometry.attributes.position.array ); // assumes non-indexed
} // set colors, maybe
return this;
}
}
LineGeometry.prototype.isLineGeometry = true;
THREE.LineGeometry = LineGeometry;
} )();