79 lines
2.7 KiB
JavaScript
79 lines
2.7 KiB
JavaScript
|
/**
|
||
|
|
* Cesium - https://github.com/CesiumGS/cesium
|
||
|
|
*
|
||
|
|
* Copyright 2011-2020 Cesium Contributors
|
||
|
|
*
|
||
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
||
|
|
* you may not use this file except in compliance with the License.
|
||
|
|
* You may obtain a copy of the License at
|
||
|
|
*
|
||
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
||
|
|
*
|
||
|
|
* Unless required by applicable law or agreed to in writing, software
|
||
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
||
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||
|
|
* See the License for the specific language governing permissions and
|
||
|
|
* limitations under the License.
|
||
|
|
*
|
||
|
|
* Columbus View (Pat. Pend.)
|
||
|
|
*
|
||
|
|
* Portions licensed separately.
|
||
|
|
* See https://github.com/CesiumGS/cesium/blob/master/LICENSE.md for full licensing details.
|
||
|
|
*/
|
||
|
|
define(['exports', './Math-61ede240'], function (exports, _Math) { 'use strict';
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @private
|
||
|
|
*/
|
||
|
|
var CylinderGeometryLibrary = {};
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @private
|
||
|
|
*/
|
||
|
|
CylinderGeometryLibrary.computePositions = function(length, topRadius, bottomRadius, slices, fill){
|
||
|
|
var topZ = length * 0.5;
|
||
|
|
var bottomZ = -topZ;
|
||
|
|
|
||
|
|
var twoSlice = slices + slices;
|
||
|
|
var size = (fill) ? 2 * twoSlice : twoSlice;
|
||
|
|
var positions = new Float64Array(size*3);
|
||
|
|
var i;
|
||
|
|
var index = 0;
|
||
|
|
var tbIndex = 0;
|
||
|
|
var bottomOffset = (fill) ? twoSlice*3 : 0;
|
||
|
|
var topOffset = (fill) ? (twoSlice + slices)*3 : slices*3;
|
||
|
|
|
||
|
|
for (i = 0; i < slices; i++) {
|
||
|
|
var angle = i / slices * _Math.CesiumMath.TWO_PI;
|
||
|
|
var x = Math.cos(angle);
|
||
|
|
var y = Math.sin(angle);
|
||
|
|
var bottomX = x * bottomRadius;
|
||
|
|
var bottomY = y * bottomRadius;
|
||
|
|
var topX = x * topRadius;
|
||
|
|
var topY = y * topRadius;
|
||
|
|
|
||
|
|
positions[tbIndex + bottomOffset] = bottomX;
|
||
|
|
positions[tbIndex + bottomOffset + 1] = bottomY;
|
||
|
|
positions[tbIndex + bottomOffset + 2] = bottomZ;
|
||
|
|
|
||
|
|
positions[tbIndex + topOffset] = topX;
|
||
|
|
positions[tbIndex + topOffset + 1] = topY;
|
||
|
|
positions[tbIndex + topOffset + 2] = topZ;
|
||
|
|
tbIndex += 3;
|
||
|
|
if (fill) {
|
||
|
|
positions[index++] = bottomX;
|
||
|
|
positions[index++] = bottomY;
|
||
|
|
positions[index++] = bottomZ;
|
||
|
|
positions[index++] = topX;
|
||
|
|
positions[index++] = topY;
|
||
|
|
positions[index++] = topZ;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return positions;
|
||
|
|
};
|
||
|
|
|
||
|
|
exports.CylinderGeometryLibrary = CylinderGeometryLibrary;
|
||
|
|
|
||
|
|
});
|