/
CylinderOutlineGeometry.js
244 lines (215 loc) · 9.86 KB
/
CylinderOutlineGeometry.js
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
import arrayFill from './arrayFill.js';
import BoundingSphere from './BoundingSphere.js';
import Cartesian2 from './Cartesian2.js';
import Cartesian3 from './Cartesian3.js';
import Check from './Check.js';
import ComponentDatatype from './ComponentDatatype.js';
import CylinderGeometryLibrary from './CylinderGeometryLibrary.js';
import defaultValue from './defaultValue.js';
import defined from './defined.js';
import DeveloperError from './DeveloperError.js';
import Geometry from './Geometry.js';
import GeometryAttribute from './GeometryAttribute.js';
import GeometryAttributes from './GeometryAttributes.js';
import GeometryOffsetAttribute from './GeometryOffsetAttribute.js';
import IndexDatatype from './IndexDatatype.js';
import PrimitiveType from './PrimitiveType.js';
var radiusScratch = new Cartesian2();
/**
* A description of the outline of a cylinder.
*
* @alias CylinderOutlineGeometry
* @constructor
*
* @param {Object} options Object with the following properties:
* @param {Number} options.length The length of the cylinder.
* @param {Number} options.topRadius The radius of the top of the cylinder.
* @param {Number} options.bottomRadius The radius of the bottom of the cylinder.
* @param {Number} [options.slices=128] The number of edges around the perimeter of the cylinder.
* @param {Number} [options.numberOfVerticalLines=16] Number of lines to draw between the top and bottom surfaces of the cylinder.
*
* @exception {DeveloperError} options.length must be greater than 0.
* @exception {DeveloperError} options.topRadius must be greater than 0.
* @exception {DeveloperError} options.bottomRadius must be greater than 0.
* @exception {DeveloperError} bottomRadius and topRadius cannot both equal 0.
* @exception {DeveloperError} options.slices must be greater than or equal to 3.
*
* @see CylinderOutlineGeometry.createGeometry
*
* @example
* // create cylinder geometry
* var cylinder = new Cesium.CylinderOutlineGeometry({
* length: 200000,
* topRadius: 80000,
* bottomRadius: 200000,
* });
* var geometry = Cesium.CylinderOutlineGeometry.createGeometry(cylinder);
*/
function CylinderOutlineGeometry(options) {
options = defaultValue(options, defaultValue.EMPTY_OBJECT);
var length = options.length;
var topRadius = options.topRadius;
var bottomRadius = options.bottomRadius;
var slices = defaultValue(options.slices, 128);
var numberOfVerticalLines = Math.max(defaultValue(options.numberOfVerticalLines, 16), 0);
//>>includeStart('debug', pragmas.debug);
Check.typeOf.number('options.positions', length);
Check.typeOf.number('options.topRadius', topRadius);
Check.typeOf.number('options.bottomRadius', bottomRadius);
Check.typeOf.number.greaterThanOrEquals('options.slices', slices, 3);
if (defined(options.offsetAttribute) && options.offsetAttribute === GeometryOffsetAttribute.TOP) {
throw new DeveloperError('GeometryOffsetAttribute.TOP is not a supported options.offsetAttribute for this geometry.');
}
//>>includeEnd('debug');
this._length = length;
this._topRadius = topRadius;
this._bottomRadius = bottomRadius;
this._slices = slices;
this._numberOfVerticalLines = numberOfVerticalLines;
this._offsetAttribute = options.offsetAttribute;
this._workerName = 'createCylinderOutlineGeometry';
}
/**
* The number of elements used to pack the object into an array.
* @type {Number}
*/
CylinderOutlineGeometry.packedLength = 6;
/**
* Stores the provided instance into the provided array.
*
* @param {CylinderOutlineGeometry} value The value to pack.
* @param {Number[]} array The array to pack into.
* @param {Number} [startingIndex=0] The index into the array at which to start packing the elements.
*
* @returns {Number[]} The array that was packed into
*/
CylinderOutlineGeometry.pack = function(value, array, startingIndex) {
//>>includeStart('debug', pragmas.debug);
Check.typeOf.object('value', value);
Check.defined('array', array);
//>>includeEnd('debug');
startingIndex = defaultValue(startingIndex, 0);
array[startingIndex++] = value._length;
array[startingIndex++] = value._topRadius;
array[startingIndex++] = value._bottomRadius;
array[startingIndex++] = value._slices;
array[startingIndex++] = value._numberOfVerticalLines;
array[startingIndex] = defaultValue(value._offsetAttribute, -1);
return array;
};
var scratchOptions = {
length : undefined,
topRadius : undefined,
bottomRadius : undefined,
slices : undefined,
numberOfVerticalLines : undefined,
offsetAttribute : undefined
};
/**
* Retrieves an instance from a packed array.
*
* @param {Number[]} array The packed array.
* @param {Number} [startingIndex=0] The starting index of the element to be unpacked.
* @param {CylinderOutlineGeometry} [result] The object into which to store the result.
* @returns {CylinderOutlineGeometry} The modified result parameter or a new CylinderOutlineGeometry instance if one was not provided.
*/
CylinderOutlineGeometry.unpack = function(array, startingIndex, result) {
//>>includeStart('debug', pragmas.debug);
Check.defined('array', array);
//>>includeEnd('debug');
startingIndex = defaultValue(startingIndex, 0);
var length = array[startingIndex++];
var topRadius = array[startingIndex++];
var bottomRadius = array[startingIndex++];
var slices = array[startingIndex++];
var numberOfVerticalLines = array[startingIndex++];
var offsetAttribute = array[startingIndex];
if (!defined(result)) {
scratchOptions.length = length;
scratchOptions.topRadius = topRadius;
scratchOptions.bottomRadius = bottomRadius;
scratchOptions.slices = slices;
scratchOptions.numberOfVerticalLines = numberOfVerticalLines;
scratchOptions.offsetAttribute = offsetAttribute === -1 ? undefined : offsetAttribute;
return new CylinderOutlineGeometry(scratchOptions);
}
result._length = length;
result._topRadius = topRadius;
result._bottomRadius = bottomRadius;
result._slices = slices;
result._numberOfVerticalLines = numberOfVerticalLines;
result._offsetAttribute = offsetAttribute === -1 ? undefined : offsetAttribute;
return result;
};
/**
* Computes the geometric representation of an outline of a cylinder, including its vertices, indices, and a bounding sphere.
*
* @param {CylinderOutlineGeometry} cylinderGeometry A description of the cylinder outline.
* @returns {Geometry|undefined} The computed vertices and indices.
*/
CylinderOutlineGeometry.createGeometry = function(cylinderGeometry) {
var length = cylinderGeometry._length;
var topRadius = cylinderGeometry._topRadius;
var bottomRadius = cylinderGeometry._bottomRadius;
var slices = cylinderGeometry._slices;
var numberOfVerticalLines = cylinderGeometry._numberOfVerticalLines;
if ((length <= 0) || (topRadius < 0) || (bottomRadius < 0) || ((topRadius === 0) && (bottomRadius === 0))) {
return;
}
var numVertices = slices * 2;
var positions = CylinderGeometryLibrary.computePositions(length, topRadius, bottomRadius, slices, false);
var numIndices = slices * 2;
var numSide;
if (numberOfVerticalLines > 0) {
var numSideLines = Math.min(numberOfVerticalLines, slices);
numSide = Math.round(slices / numSideLines);
numIndices += numSideLines;
}
var indices = IndexDatatype.createTypedArray(numVertices, numIndices * 2);
var index = 0;
var i;
for (i = 0; i < slices - 1; i++) {
indices[index++] = i;
indices[index++] = i + 1;
indices[index++] = i + slices;
indices[index++] = i + 1 + slices;
}
indices[index++] = slices - 1;
indices[index++] = 0;
indices[index++] = slices + slices - 1;
indices[index++] = slices;
if (numberOfVerticalLines > 0) {
for (i = 0; i < slices; i += numSide) {
indices[index++] = i;
indices[index++] = i + slices;
}
}
var attributes = new GeometryAttributes();
attributes.position = new GeometryAttribute({
componentDatatype : ComponentDatatype.DOUBLE,
componentsPerAttribute : 3,
values : positions
});
radiusScratch.x = length * 0.5;
radiusScratch.y = Math.max(bottomRadius, topRadius);
var boundingSphere = new BoundingSphere(Cartesian3.ZERO, Cartesian2.magnitude(radiusScratch));
if (defined(cylinderGeometry._offsetAttribute)) {
length = positions.length;
var applyOffset = new Uint8Array(length / 3);
var offsetValue = cylinderGeometry._offsetAttribute === GeometryOffsetAttribute.NONE ? 0 : 1;
arrayFill(applyOffset, offsetValue);
attributes.applyOffset = new GeometryAttribute({
componentDatatype : ComponentDatatype.UNSIGNED_BYTE,
componentsPerAttribute : 1,
values: applyOffset
});
}
return new Geometry({
attributes : attributes,
indices : indices,
primitiveType : PrimitiveType.LINES,
boundingSphere : boundingSphere,
offsetAttribute : cylinderGeometry._offsetAttribute
});
};
export default CylinderOutlineGeometry;