1 /* Copyright 2002-2026 CS GROUP
2 * Licensed to CS GROUP (CS) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * CS licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17 package org.orekit.geometry.fov;
18
19 /** Abstract class representing a spacecraft sensor Field Of View.
20 * @author Luc Maisonobe
21 * @since 10.1
22 */
23 public abstract class AbstractFieldOfView implements FieldOfView {
24
25 /**
26 * The default setting for if the footprint should be projected
27 * off the body onto a spatial point when there is no intersection point.
28 */
29 protected static final boolean DEFAULT_EXTERNAL_FOOTPRINT = false;
30
31 /**
32 * The default length of line segments of extended footprints that
33 * project directly into space.
34 */
35 protected static final double DEFAULT_MAX_DIST = 1e7;
36
37 /** Margin to apply to the zone. */
38 private final double margin;
39
40 /** Build a new instance.
41 * @param margin angular margin to apply to the zone (if positive,
42 * points outside of the raw FoV but close enough to the boundary are
43 * considered visible; if negative, points inside of the raw FoV
44 * but close enough to the boundary are considered not visible)
45 */
46 protected AbstractFieldOfView(final double margin) {
47 this.margin = margin;
48 }
49
50 /** {@inheritDoc} */
51 @Override
52 public double getMargin() {
53 return margin;
54 }
55
56 }