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Move to Typescript.

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Manuel Friedli 2023-04-17 02:43:36 +02:00
parent 34618860a4
commit ac964ddd3f
16 changed files with 482 additions and 119 deletions
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73
src/userpathhandler.js
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@ -1,73 +0,0 @@
export default function handleUserClicked(state, x, y) {
if (isClickAllowed(x, y, state)) {
// Okay, we clicked a cell that's adjacent to the end of the userpath (or which IS the end of the userpath)
// and that's not blocked by a wall. Now let's see.
if (-1 === state.userPath.findIndex(step => step.x === x && step.y === y)) {
// The clicked cell is not yet part of the userpath --> add it.
return {
...state,
userPath: [...state.userPath, {x: x, y: y}]
};
} else {
// The clicked cell IS part of the userpath. Is it the last cell of it?
const lastCoordsFromUserPath = getLastCoordsFromUserPath(state);
if (lastCoordsFromUserPath.x === x && lastCoordsFromUserPath.y === y) {
// Yes, it's the last cell of the userpath --> remove it.
return {
...state,
userPath: state.userPath.filter(step => step.x !== x || step.y !== y)
}
}
}
}
// Not allowed to toggle that cell. Don't apply any change to the state.
return state;
}
function isClickAllowed(x, y, state) {
const lastCoordsFromUserPath = getLastCoordsFromUserPath(state);
if (!lastCoordsFromUserPath) {
// when nothing has been marked yet, we can only toggle the starting position
return x === state.maze.start.x && y === state.maze.start.y;
}
if (lastCoordsFromUserPath.x === x && lastCoordsFromUserPath.y === y) {
// toggling the last position in the path is always allowed
return true;
}
if (Math.abs(x - lastCoordsFromUserPath.x) + Math.abs(y - lastCoordsFromUserPath.y) !== 1) {
// It's not a neighbor. So it's not allowed.
return false;
}
const lastCell = getCellAt(lastCoordsFromUserPath, state);
if (x === lastCoordsFromUserPath.x + 1) {
// There must be no wall to the right of the last cell.
return !lastCell.right;
}
if (x === lastCoordsFromUserPath.x - 1) {
// There must be no wall to the left of the last cell.
return !lastCell.left;
}
if (y === lastCoordsFromUserPath.y + 1) {
// There must be no wall below the last cell.
return !lastCell.bottom;
}
if (y === lastCoordsFromUserPath.y - 1) {
// There must be no wall above the last cell.
return !lastCell.top;
}
return false;
}
function getCellAt(coords, state) {
return state.maze.grid[coords.y][coords.x];
}
function getLastCoordsFromUserPath(state) {
if (state.userPath.length > 0) {
return state.userPath[state.userPath.length - 1];
}
return null;
}