Function updateZoom

source/zoom.js:29–55

(context, queue, zoomer, world, colours)

};

export const updateZoom = (context, queue, zoomer, world, colours) => {
  const missingSpeed = zoomer.desiredSpeed - zoomer.speed;

  zoomer.speed += Math.sign(missingSpeed) * 0.15;
  if (!zoomer.smoothMode) zoomer.speed = zoomer.desiredSpeed;

  if (Math.abs(zoomer.speed) < 0.001) {
    zoomer.speed = 0.0;
  }
  if (zoomer.speed === 0.0) return;

  if (!zoomer.smoothMode) {
    zoomer.desiredSpeed *= 0.8;
    if (Math.abs(zoomer.desiredSpeed) < 0.001) {
      zoomer.desiredSpeed = 0.0;
    }
  }

  const mousePosition = getMousePosition(context, VIEW_CORNERS);
  const zoomedCorners = getZoomedPositions(
    world.corners,
    1.0 + zoomer.speed * -0.002,
    mousePosition
  );
  setWorldCorners(world, zoomedCorners, colours);
  clearQueue(context, queue, world);
};