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
|
package tim.prune.function.compress.methods;
import tim.prune.data.DataPoint;
import tim.prune.data.MarkingData;
import tim.prune.data.NumberUtils;
import tim.prune.data.Track;
import tim.prune.function.compress.CompressionMethodType;
import tim.prune.function.compress.TrackDetails;
public class SingletonsMethod extends CompressionMethod
{
private final double _factor;
public SingletonsMethod(double factor) {
_factor = factor;
}
public SingletonsMethod(String inString) {
_factor = NumberUtils.getDoubleOrZero(recogniseString(inString) ? inString.substring(4) : inString);
}
public CompressionMethodType getType() {
return CompressionMethodType.SINGLETONS;
}
public String getParam() {
return "" + Math.abs(_factor);
}
public int compress(Track inTrack, TrackDetails inDetails, MarkingData inMarkings)
{
final int numPoints = inTrack.getNumPoints();
int numDeleted = 0;
double threshold = tweakFactor(_factor) * inDetails.getMeanRadians();
DataPoint currPoint = null, prevPoint = null;
final TrackDetails modifiedDetails = inDetails.modifyUsingMarkings(inMarkings);
// Loop over all points looking for points far away from neighbours
for (int i=0; i<numPoints; i++)
{
if (inMarkings.isPointMarkedForDeletion(i)) {
continue;
}
currPoint = inTrack.getPoint(i);
// Don't delete any waypoints or photo points
// Only interested in start and end of segments
if (!currPoint.isWaypoint() && !currPoint.hasMedia()
&& modifiedDetails.isSegmentStart(i) && modifiedDetails.isSegmentEnd(i))
{
// Measure distance from previous track point
if (DataPoint.calculateRadiansBetween(prevPoint, currPoint) > threshold)
{
// Now need to find next track point, and measure distances
DataPoint nextPoint = getNextTrackPoint(inTrack, i+1, inMarkings);
if (nextPoint == null || DataPoint.calculateRadiansBetween(currPoint, nextPoint) > threshold)
{
// Found a point to delete
inMarkings.markPointForDeletion(i);
numDeleted++;
}
}
}
// Remember last (not-deleted) track point
if (!currPoint.isWaypoint() && !inMarkings.isPointMarkedForDeletion(i)) {
prevPoint = currPoint;
}
}
return numDeleted;
}
/**
* If the parameter is greater than 1, take the inverse
* so we can multiply it by the distance to get a threshold
*/
private double tweakFactor(double inParam)
{
if (inParam <= 0.0) {
return 1.0;
}
return inParam <= 1.0 ? inParam : (1.0 / inParam);
}
public String getSettingsString() {
return getType().getKey() + _factor;
}
static boolean recogniseString(String inString) {
return recogniseString(inString, CompressionMethodType.SINGLETONS);
}
}
|
