feat: added isochrone maps #1535
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This PR introduces a new IsochroneMapProvider class to compute and draw isochrone polygons on a Google Map. It supports multiple durations, transport modes, and color schemas, with a loading indicator callback to track rendering progress.
Features
Isochrone computation:
Uses Google Directions API to estimate travel time for radial points around an origin, refining distances with a binary search to form accurate isochrone polygons.
Drawing order and colors:
Polygons are drawn from outermost to innermost with a green-to-red gradient (green = shortest duration, red = longest) for intuitive visualization.
Hole clipping between isochrones:
Inner polygons are added as holes inside outer polygons to prevent visual overlap and create distinct rings.
Loading listener:
Callbacks notify when loading starts and finishes, enabling UI feedback such as progress spinners.
Transport mode flexibility:
Supports bicycling, walking, driving, and transit modes via Google Directions API.
Smooth polygons:
Chaikin smoothing is applied to polygon edges for improved appearance.