84 lines
2.3 KiB
JavaScript
84 lines
2.3 KiB
JavaScript
import Vector2 from "../helpers/Vector2";
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import {
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getCellLocation,
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getNearestCellCoordinates,
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getCellCorners,
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} from "../helpers/grid";
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import useSetting from "./useSetting";
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import { useGrid } from "../contexts/GridContext";
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/**
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* Returns a function that when called will snap a node to the current grid
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* @param {number=} snappingSensitivity 1 = Always snap, 0 = never snap if undefined the default user setting will be used
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*/
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function useGridSnapping(snappingSensitivity) {
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const [defaultSnappingSensitivity] = useSetting(
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"map.gridSnappingSensitivity"
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);
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snappingSensitivity = snappingSensitivity || defaultSnappingSensitivity;
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const { grid, gridOffset, gridCellPixelSize } = useGrid();
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/**
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* @param {Vector2} node The node to snap
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*/
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function snapPositionToGrid(position) {
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// Account for grid offset
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let offsetPosition = Vector2.subtract(position, gridOffset);
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// Move hex tiles to top left
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if (grid.type === "hexVertical" || grid.type === "hexHorizontal") {
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offsetPosition = Vector2.subtract(
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offsetPosition,
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Vector2.multiply(gridCellPixelSize, 0.5)
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);
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}
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const nearsetCell = getNearestCellCoordinates(
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grid,
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offsetPosition.x,
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offsetPosition.y,
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gridCellPixelSize
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);
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const cellPosition = getCellLocation(
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grid,
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nearsetCell.x,
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nearsetCell.y,
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gridCellPixelSize
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);
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const cellCorners = getCellCorners(
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grid,
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cellPosition.x,
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cellPosition.y,
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gridCellPixelSize
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);
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const snapPoints = [cellPosition, ...cellCorners];
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for (let snapPoint of snapPoints) {
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const distanceToSnapPoint = Vector2.distance(offsetPosition, snapPoint);
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if (
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distanceToSnapPoint <
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Vector2.min(gridCellPixelSize) * snappingSensitivity
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) {
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// Reverse grid offset
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let offsetSnapPoint = Vector2.add(snapPoint, gridOffset);
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// Reverse offset for hex tiles
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if (grid.type === "hexVertical" || grid.type === "hexHorizontal") {
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offsetSnapPoint = Vector2.add(
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offsetSnapPoint,
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Vector2.multiply(gridCellPixelSize, 0.5)
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);
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}
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return offsetSnapPoint;
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}
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}
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return position;
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}
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return snapPositionToGrid;
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}
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export default useGridSnapping;
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