com.telenav.mesakit.navigation.routing.cost.functions.heuristic.RemainingDistanceToStartCostFunction Maven / Gradle / Ivy

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package com.telenav.mesakit.navigation.routing.cost.functions.heuristic;

import com.telenav.mesakit.graph.Edge;
import com.telenav.mesakit.map.geography.Located;
import com.telenav.mesakit.map.geography.Location;
import com.telenav.mesakit.navigation.routing.cost.Cost;
import com.telenav.mesakit.navigation.routing.cost.CostFunction;

/**
 * Cost of the remaining distance to the goal "as the crow flies"
 *
 * @author jonathanl (shibo)
 */
public class RemainingDistanceToStartCostFunction implements CostFunction
{
    private final Location start;

    private final double totalDistanceInMeters;

    public RemainingDistanceToStartCostFunction(Located start, Located end)
    {
        this.start = start.location();
        totalDistanceInMeters = end.location().distanceTo(start).asMeters();
    }

    @Override
    public Cost cost(Edge edge)
    {
        return Cost.inverse(Math.min(1.0, edge.fromLocation().distanceTo(start).asMeters() / totalDistanceInMeters));
    }
}