Route time or ETA

[leightonl]

Hi all,

In which class is route time or route ETA calculated?

[Sam_Crawford]

The total duration of a path is the sum of the duration of each edge. The duration of each edge is calculated here:

graphhopper/graphhopper/blob/4.0/core/src/main/java/com/graphhopper/routing/weighting/AbstractWeighting.java#L79

Your main ability to influence the value returned will come from changing the speed of an edge. For example, see here if you’re using the custom model: https://github.com/graphhopper/graphhopper/blob/master/docs/core/custom-models.md#custom-models-by-the-example-of-customizing-speed

If you’re not using the custom model, then the speed of the edges is set in the flag encoder.

[leightonl]

Thank you @Sam_Crawford

[leightonl]

I have customized the Shortest weighting to include a speedclass tag/encoded value in the formula for my customized Short Easy weighting. Would the ETA and distance both be calculated using calcEdgeWeight = edgeState.getDistance() / speedclass; as below?

public class ShortestEasyWeightingSpeedClass extends ShortestWeighting {

   private final DecimalEncodedValue xmaxspeedEnc;
   private final DecimalEncodedValue xroutingpriorityEnc;
   private final DecimalEncodedValue speedClassEnc;
    public ShortestEasyWeightingSpeedClass(FlagEncoder encoder) {

        super(encoder);

        List<EncodedValue> encodedValues  = encoder.getEncodedValues();
        System.out.println("Encoded Values:");
        for(EncodedValue ev : encodedValues){

        }


        xmaxspeedEnc = flagEncoder.getDecimalEncodedValue(EncodingManager.getKey(flagEncoder, "x_maxspeed"));   
        xroutingpriorityEnc = encoder.getDecimalEncodedValue(EncodingManager.getKey(encoder, "x_routing_priority"));
        speedClassEnc = encoder.getDecimalEncodedValue(EncodingManager.getKey(encoder, "speedclass"));


    }


    @Override
    public double getMinWeight(double currDistToGoal) {
        return currDistToGoal;
    }

    @Override
    public double calcEdgeWeight(EdgeIteratorState edgeState, boolean reverse) {


        double speedclass = speedClassEnc.getDecimal(false, edgeState.getFlags());

        if (speedclass == 0.0) {
            speedclass = 0.125;
        } else if (speedclass == 1.0) {
            speedclass = 0.25;
        } else if (speedclass == 2.0) {
            speedclass = 0.375;
        } else if (speedclass == 3.0) {
            speedclass = 0.5;
        } else if (speedclass == 4.0) {
            speedclass = 0.625;
        } else if (speedclass == 5.0) {
            speedclass = 0.75;
        } else if (speedclass == 6.0) {
            speedclass = 0.875;
        } else if (speedclass == 7.0) {
            speedclass = 1.0;
        }

        double calcEdgeWeight = edgeState.getDistance() / speedclass;
        return calcEdgeWeight;

    }



    @Override
    public String getName() {
        return "short_easy_speedclass";
    } 
}