Deciphering the JSON structure of GoogleMaps Directions API

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In order to display instructions as a user reaches a location, I need to access the "STEPS" JSON Array. This array contains startLocation and endLocation objects.

I have the ability to retrieve my current location's latitude and longitude as well as the route's JSON Data. However, I am unsure whether to compare my location with the startLocation or the endLocation within the "Steps".

I aim to showcase all relevant instructions (such as duration and distance) from the "Steps" JSONArray based on my current location comparison.

Should I compare my currentLocation with:

  1. StartLocation
  2. endLocation
arraysjsongoogle-mapsgoogle-maps-api-3google-directions-api

Answer №1

Imagine you have 100 steps to follow. If you're at step 0, you need to see all 100 steps. If you're at step 1, you should display steps 1 to 100, and so forth.

It's important to consider the edge cases: - When starting from the beginning of the json response, it doesn't make sense to compare with the last point of the current step. - At the final step, if your position matches the endLocation, there should be no further instructions. Therefore, only display the last step when your position matches the startLocation of that step.

Another thing to keep in mind is that if your position matches the startLocation of step N, show the steps from N to 100.

This can also be understood as, if your position matches the endLocation of step N, then show the steps from N+1 to 100.

Lastly, a helpful tip is to trim or round the coordinates when comparing positions in the json response. Beyond the sixth digit, they are considered the same location. There have been instances where the endLocation of one step does not match the startLocation of the next. It happens.

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