tldraw/dist-esm/lib/shapes/line/toolStates/Pointing.mjs

A tiny little drawing editor.

import {
  Mat,
  StateNode,
  Vec,
  createShapeId,
  getIndexAbove,
  last,
  maybeSnapToGrid,
  sortByIndex,
  structuredClone
} from "@tldraw/editor";
const MINIMUM_DISTANCE_BETWEEN_SHIFT_CLICKED_HANDLES = 2;
class Pointing extends StateNode {
  static id = "pointing";
  shape = {};
  markId;
  onEnter(info) {
    const { inputs } = this.editor;
    const { currentPagePoint } = inputs;
    this.markId = void 0;
    const shape = info.shapeId && this.editor.getShape(info.shapeId);
    if (shape && inputs.shiftKey) {
      this.markId = this.editor.markHistoryStoppingPoint(`creating_line:${shape.id}`);
      this.shape = shape;
      const handles = this.editor.getShapeHandles(this.shape);
      if (!handles) return;
      const vertexHandles = handles.filter((h) => h.type === "vertex").sort(sortByIndex);
      const endHandle = vertexHandles[vertexHandles.length - 1];
      const prevEndHandle = vertexHandles[vertexHandles.length - 2];
      const shapePagePoint = Mat.applyToPoint(
        this.editor.getShapeParentTransform(this.shape),
        new Vec(this.shape.x, this.shape.y)
      );
      const nudgedPoint = Vec.Sub(currentPagePoint, shapePagePoint).addXY(0.1, 0.1);
      const nextPoint = maybeSnapToGrid(nudgedPoint, this.editor);
      const points = structuredClone(this.shape.props.points);
      if (Vec.DistMin(endHandle, prevEndHandle, MINIMUM_DISTANCE_BETWEEN_SHIFT_CLICKED_HANDLES) || Vec.DistMin(nextPoint, endHandle, MINIMUM_DISTANCE_BETWEEN_SHIFT_CLICKED_HANDLES)) {
        points[endHandle.id] = {
          id: endHandle.id,
          index: endHandle.index,
          x: nextPoint.x,
          y: nextPoint.y
        };
      } else {
        const nextIndex = getIndexAbove(endHandle.index);
        points[nextIndex] = {
          id: nextIndex,
          index: nextIndex,
          x: nextPoint.x,
          y: nextPoint.y
        };
      }
      this.editor.updateShapes([
        {
          id: this.shape.id,
          type: this.shape.type,
          props: {
            points
          }
        }
      ]);
    } else {
      const id = createShapeId();
      this.markId = this.editor.markHistoryStoppingPoint(`creating_line:${id}`);
      const newPoint = maybeSnapToGrid(currentPagePoint, this.editor);
      this.editor.createShapes([
        {
          id,
          type: "line",
          x: newPoint.x,
          y: newPoint.y,
          props: {
            scale: this.editor.user.getIsDynamicResizeMode() ? 1 / this.editor.getZoomLevel() : 1
          }
        }
      ]);
      this.editor.select(id);
      this.shape = this.editor.getShape(id);
    }
  }
  onPointerMove() {
    if (!this.shape) return;
    if (this.editor.inputs.isDragging) {
      const handles = this.editor.getShapeHandles(this.shape);
      if (!handles) {
        if (this.markId) this.editor.bailToMark(this.markId);
        throw Error("No handles found");
      }
      const lastHandle = last(handles);
      this.editor.setCurrentTool("select.dragging_handle", {
        shape: this.shape,
        isCreating: true,
        creatingMarkId: this.markId,
        // remove the offset that we added to the handle when we created it
        handle: { ...lastHandle, x: lastHandle.x - 0.1, y: lastHandle.y - 0.1 },
        onInteractionEnd: "line"
      });
    }
  }
  onPointerUp() {
    this.complete();
  }
  onCancel() {
    this.cancel();
  }
  onComplete() {
    this.complete();
  }
  onInterrupt() {
    this.parent.transition("idle");
    if (this.markId) this.editor.bailToMark(this.markId);
    this.editor.snaps.clearIndicators();
  }
  complete() {
    this.parent.transition("idle", { shapeId: this.shape.id });
    this.editor.snaps.clearIndicators();
  }
  cancel() {
    if (this.markId) this.editor.bailToMark(this.markId);
    this.parent.transition("idle", { shapeId: this.shape.id });
    this.editor.snaps.clearIndicators();
  }
}
export {
  Pointing
};
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