Function replaceAddress

source/pick.js:226–315

({
  address,
  screen,
  target,
  parent,
  depth,
  ...options
} = {})

//
// note: 'screen' and 'target' should have their corners be relative to the view
export const replaceAddress = ({
  address,
  screen,
  target,
  parent,
  depth,
  ...options
} = {}) => {
  const oldScreen = getScreenFromAddress(address);
  const targetedCorners = getMappedPositions(screen.corners, target.corners);
  const targetedScreen = makeScreen(screen.colour, targetedCorners);

  // Pick where to place the screen
  const pickOptions = { ...options, ignore: oldScreen, ignoreDepth: depth };
  let picks = targetedScreen.corners.map((corner) =>
    pickInScreen(target, corner, pickOptions)
  );
  let isStillWithParent = picks.some((pick) => pick.screen === parent);

  if (!isStillWithParent) {
    const snapPicks = targetedScreen.corners.map((corner) =>
      pickInScreen(target, corner, { ...pickOptions, snap: parent })
    );
    const snapIsStillWithParent = snapPicks.some(
      (pick) => pick.screen === parent
    );
    if (snapIsStillWithParent) {
      const depth = Math.min(...picks.map((pick) => pick.depth));
      const snapDepth = Math.min(...snapPicks.map((pick) => pick.depth));
      if (snapDepth >= depth) {
        picks = snapPicks;
        isStillWithParent = snapIsStillWithParent;
      }
    }
  }

  // Decide which pick (out of the 4) to use as the basis for the placement
  const [head, ...tail] = picks;
  let pickLeader = head;
  if (isStillWithParent) {
    pickLeader = picks.find((pick) => pick.screen === parent);
  } else
    for (const pick of tail) {
      if (pick.depth > pickLeader.depth) {
        pickLeader = pick;
      }
    }

  // Place the screen
  const mappedCorners = getMappedPositions(screen.corners, pickLeader.corners);
  let number = address.number;
  if (false && isStillWithParent) {
    oldScreen.corners = mappedCorners;
  } else {
    const mappedScreen = makeScreen(screen.colour, mappedCorners);
    if (address.colour === pickLeader.screen.colour) {
      setScreenNumber(address.colour, address.number, mappedScreen);
      number = address.number;