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61 lines
1.9 KiB
61 lines
1.9 KiB
package seng302.Model;
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import seng302.GPSCoordinate;
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/**
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* A TrackPoint is a point plotted to display the track a
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* {@link seng302.Model.Boat Boat} has travelled in a race. <br>
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* TrackPoints are displayed on a
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* {@link seng302.Model.ResizableRaceCanvas ResizableRaceCanvas}, via the
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* {@link seng302.Controllers.RaceController RaceController}. <br>
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* Track points can be made visible or hidden via the RaceController's
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* {@link seng302.Model.Annotations Annotations}.
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*/
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public class TrackPoint {
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private final GPSCoordinate coordinate;
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private final long timeAdded;
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private final long expiry;
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private final double minAlpha;
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/**
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* Creates a new track point with fixed GPS coordinates and time, to reach minimum opacity on expiry.
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*
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* @param coordinate position of point on physical race map
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* @param timeAdded system clock at time of addition
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* @param expiry time to minimum opacity after added
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*/
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public TrackPoint(GPSCoordinate coordinate, long timeAdded, long expiry) {
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this.coordinate = coordinate;
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this.timeAdded = timeAdded;
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this.expiry = expiry;
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this.minAlpha = 0.1;
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}
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/**
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* Gets the position of the point on physical race map.
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*
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* @return GPS coordinate of point
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*/
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public GPSCoordinate getCoordinate() {
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return coordinate;
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}
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/**
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* Gets opacity of point scaled by age in proportion to expiry, between 1 and minimum opacity inclusive.
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*
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* @return greater of minimum opacity and scaled opacity
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*/
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public double getAlpha() {
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return Double.max(minAlpha, 1.0 - (double) (System.currentTimeMillis() - timeAdded) / expiry);
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}
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/**
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* Gets time point was added to track.
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*
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* @return system clock at time of addition
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*/
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public long getTimeAdded() {
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return timeAdded;
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}
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}
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