import CesiumMath from "./Math.js";
|
|
/**
|
* @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) * 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;
|
};
|
export default CylinderGeometryLibrary;
|
