@tldraw/editor/dist-esm/lib/editor/managers/SnapManager/HandleSnaps.mjs

tldraw infinite canvas SDK (editor).

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var _getSnapGeometryCache_dec, _init;
import { computed } from "@tldraw/state";
import { assertExists, uniqueId } from "@tldraw/utils";
import { Vec } from "../../../primitives/Vec.mjs";
const defaultGetSelfSnapOutline = () => null;
const defaultGetSelfSnapPoints = () => [];
_getSnapGeometryCache_dec = [computed];
class HandleSnaps {
  constructor(manager) {
    this.manager = manager;
    __runInitializers(_init, 5, this);
    __publicField(this, "editor");
    this.editor = manager.editor;
  }
  getSnapGeometryCache() {
    const { editor } = this;
    return editor.store.createComputedCache("handle snap geometry", (shape) => {
      const snapGeometry = editor.getShapeUtil(shape).getHandleSnapGeometry(shape);
      const getSelfSnapOutline = snapGeometry.getSelfSnapOutline ? snapGeometry.getSelfSnapOutline.bind(snapGeometry) : defaultGetSelfSnapOutline;
      const getSelfSnapPoints = snapGeometry.getSelfSnapPoints ? snapGeometry.getSelfSnapPoints.bind(snapGeometry) : defaultGetSelfSnapPoints;
      return {
        outline: snapGeometry.outline === void 0 ? editor.getShapeGeometry(shape) : snapGeometry.outline,
        points: snapGeometry.points ?? [],
        getSelfSnapOutline,
        getSelfSnapPoints
      };
    });
  }
  *iterateSnapPointsInPageSpace(currentShapeId, currentHandle) {
    const selfSnapPoints = this.getSnapGeometryCache().get(currentShapeId)?.getSelfSnapPoints(currentHandle);
    if (selfSnapPoints && selfSnapPoints.length) {
      const shapePageTransform = assertExists(this.editor.getShapePageTransform(currentShapeId));
      for (const point of selfSnapPoints) {
        yield shapePageTransform.applyToPoint(point);
      }
    }
    for (const shapeId of this.manager.getSnappableShapes()) {
      if (shapeId === currentShapeId) continue;
      const snapPoints = this.getSnapGeometryCache().get(shapeId)?.points;
      if (!snapPoints || !snapPoints.length) continue;
      const shapePageTransform = assertExists(this.editor.getShapePageTransform(shapeId));
      for (const point of snapPoints) {
        yield shapePageTransform.applyToPoint(point);
      }
    }
  }
  *iterateSnapOutlines(currentShapeId, currentHandle) {
    const selfSnapOutline = this.getSnapGeometryCache().get(currentShapeId)?.getSelfSnapOutline(currentHandle);
    if (selfSnapOutline) {
      yield { shapeId: currentShapeId, outline: selfSnapOutline };
    }
    for (const shapeId of this.manager.getSnappableShapes()) {
      if (shapeId === currentShapeId) continue;
      const snapOutline = this.getSnapGeometryCache().get(shapeId)?.outline;
      if (!snapOutline) continue;
      yield { shapeId, outline: snapOutline };
    }
  }
  getHandleSnapPosition({
    currentShapeId,
    handle,
    handleInPageSpace
  }) {
    const snapThreshold = this.manager.getSnapThreshold();
    let minDistanceForSnapPoint = snapThreshold;
    let nearestSnapPoint = null;
    for (const snapPoint of this.iterateSnapPointsInPageSpace(currentShapeId, handle)) {
      if (Vec.DistMin(handleInPageSpace, snapPoint, minDistanceForSnapPoint)) {
        minDistanceForSnapPoint = Vec.Dist(handleInPageSpace, snapPoint);
        nearestSnapPoint = snapPoint;
      }
    }
    if (nearestSnapPoint) return nearestSnapPoint;
    let minDistanceForOutline = snapThreshold;
    let nearestPointOnOutline = null;
    for (const { shapeId, outline } of this.iterateSnapOutlines(currentShapeId, handle)) {
      const shapePageTransform = assertExists(this.editor.getShapePageTransform(shapeId));
      const pointInShapeSpace = this.editor.getPointInShapeSpace(shapeId, handleInPageSpace);
      const nearestShapePointInShapeSpace = outline.nearestPoint(pointInShapeSpace);
      const nearestInPageSpace = shapePageTransform.applyToPoint(nearestShapePointInShapeSpace);
      if (Vec.DistMin(handleInPageSpace, nearestInPageSpace, minDistanceForOutline)) {
        minDistanceForOutline = Vec.Dist(handleInPageSpace, nearestInPageSpace);
        nearestPointOnOutline = nearestInPageSpace;
      }
    }
    if (nearestPointOnOutline) return nearestPointOnOutline;
    return null;
  }
  snapHandle({
    currentShapeId,
    handle
  }) {
    const currentShapeTransform = assertExists(this.editor.getShapePageTransform(currentShapeId));
    const handleInPageSpace = currentShapeTransform.applyToPoint(handle);
    const snapPosition = this.getHandleSnapPosition({ currentShapeId, handle, handleInPageSpace });
    if (snapPosition) {
      this.manager.setIndicators([
        {
          id: uniqueId(),
          type: "points",
          points: [snapPosition]
        }
      ]);
      return { nudge: Vec.Sub(snapPosition, handleInPageSpace) };
    }
    return null;
  }
}
_init = __decoratorStart(null);
__decorateElement(_init, 1, "getSnapGeometryCache", _getSnapGeometryCache_dec, HandleSnaps);
__decoratorMetadata(_init, HandleSnaps);
export {
  HandleSnaps
};
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