worldToPosition method

@override Geographic worldToPosition(Projected world)

Transforms world coordinates to a position.

Coordinate value ranges:

• world x (double): 0.0 .. mapWidth(0)
• world y (double): 0.0 .. mapHeight(0)

Implementation

@override
Geographic worldToPosition(Projected world) {
  // world coordinates size: number of pixels for x and y at the zoom level 0
  final width = mapWidth(0);
  final height = mapHeight(0);

  // world coordinates
  final px = world.x;
  final double py;

  // handle origin variations
  switch (origin) {
    case CanvasOrigin.topLeft:
      py = world.y;
      break;
    case CanvasOrigin.bottomLeft:
      py = height - world.y;
      break;
  }

  // unproject world coordinates to geographic position
  return Geographic(
    lon: converter.fromScaledX(px, width: width),
    lat: converter.fromScaledY(py, height: height),

    // optional z and m are copied
    elev: world.optZ,
    m: world.optM,
  );
}