gpml2pvjson/esnext/edge/orientation.js

import { flow, isFinite, last, map } from "lodash/fp";
import { START_SEGMENT_DETAILS_MAPS, flipOrientation, sameSide, SmartPath } from "../geom-utils";
import { distance } from "../spinoffs/Angle";
import { DEFAULT_STUB_LENGTH } from "./edge";
/**
 * getOrientationOfHyperedgeStartPoint
 *
 * Get orientation of the start point of an edge that is attached to another
 * edge.
 *
 * @param referencedEdge {PvjsonEdge}
 * @param startPoint {Point}
 * @param otherPoint {Point}
 * @return {Orientation}
 */
export function getOrientationOfHyperedgeStartPoint(referencedEdge, startPoint, endPoint) {
    if (!referencedEdge) {
        throw new Error("Missing referencedEdge when calculating orientation of point attached to other edge.");
    }
    const currentPath = new SmartPath([startPoint, endPoint]);
    const angleOfCurrentVectorSum = currentPath.sum.angle;
    const referencedPath = new SmartPath(referencedEdge.points, referencedEdge);
    // This is the angle of the line tangent to the referenced edge at
    // startPoint.
    const angleOfReferencedEdgeAtPointOnEdge = referencedPath.position(startPoint.attachmentDisplay.position[0]).angle;
    const firstSegmentCalculations = START_SEGMENT_DETAILS_MAPS.map(function (startSegmentDetailsMap) {
        /*
             *   referenced edge
             *         /
             *        /
             *       /.
             *      /  angle (rad)
             *     /    .
             *    /--------------
             *   /       ^      |           --------------
             *  /        |      |           |            |
             *           |      ------------|            |
             *           |                  |            |
             *      firstSegment            --------------
             *   (of current edge)
             *
             */
        const { orientation } = startSegmentDetailsMap;
        const [orientationX, orientationY] = orientation;
        const firstSegmentEndPoint = {
            x: startPoint.x + DEFAULT_STUB_LENGTH * orientationX,
            y: startPoint.y + DEFAULT_STUB_LENGTH * orientationY
        };
        return {
            firstSegmentEndPoint,
            endPoint,
            emanationAngle: startSegmentDetailsMap.angle,
            orientation: orientation
        };
    })
        .map(function ({ firstSegmentEndPoint, endPoint, emanationAngle: emanationAngle, orientation }) {
        const isSameSide = sameSide(referencedEdge.points[0], last(referencedEdge.points), firstSegmentEndPoint, endPoint);
        const angleBetweenOrientationVectorAndCurrentEdge = distance(emanationAngle, angleOfCurrentVectorSum);
        const angleBetweenOrientationVectorAndReferencedEdge = distance(angleOfReferencedEdgeAtPointOnEdge, emanationAngle);
        return {
            isSameSide,
            angleBetweenOrientationVectorAndCurrentEdge,
            angleBetweenOrientationVectorAndVectorPerpendicularToReferencedEdge: Math.abs(angleBetweenOrientationVectorAndReferencedEdge - Math.PI / 2),
            orientation
        };
    })
        .sort(function (a, b) {
        if (a.isSameSide && !b.isSameSide) {
            return -1;
        }
        else if (!a.isSameSide && b.isSameSide) {
            return 1;
        }
        else {
            if (a.angleBetweenOrientationVectorAndVectorPerpendicularToReferencedEdge <
                b.angleBetweenOrientationVectorAndVectorPerpendicularToReferencedEdge) {
                return -1;
            }
            else if (a.angleBetweenOrientationVectorAndVectorPerpendicularToReferencedEdge >
                b.angleBetweenOrientationVectorAndVectorPerpendicularToReferencedEdge) {
                return 1;
            }
            else {
                if (a.angleBetweenOrientationVectorAndCurrentEdge <
                    b.angleBetweenOrientationVectorAndCurrentEdge) {
                    return -1;
                }
                else if (a.angleBetweenOrientationVectorAndCurrentEdge >
                    b.angleBetweenOrientationVectorAndCurrentEdge) {
                    return 1;
                }
                else {
                    return 0;
                }
            }
        }
    });
    const formatted = map(function (firstSegmentCalculation) {
        const { angleBetweenOrientationVectorAndVectorPerpendicularToReferencedEdge, angleBetweenOrientationVectorAndCurrentEdge, isSameSide } = firstSegmentCalculation;
        return {
            angleBetweenOrientationVectorAndVectorPerpendicularToReferencedEdge: String(angleBetweenOrientationVectorAndVectorPerpendicularToReferencedEdge /
                Math.PI) + " * PI",
            angleBetweenOrientationVectorAndCurrentEdge: String(angleBetweenOrientationVectorAndCurrentEdge / Math.PI) + " * PI",
            isSameSide
        };
    }, firstSegmentCalculations);
    return firstSegmentCalculations[0].orientation;
}
// Uses the same sorting criteria as getOrientationOfHyperedgeStartPoint,
// except with the obvious changes in direction to account for being the
// endPoint instead of the startPoint.
export const getOrientationOfHyperedgeEndPoint = flow(getOrientationOfHyperedgeStartPoint, flipOrientation);
// Validate orientation of attachment display.
//
// When attached to a normal Node, we can calculate the orientation immediately
// so this will return true right away.
// When attached to an Edge or Group, we need to do more processing,
// so this will at least initially return false.
// TODO: Not sure whether the orientation of a point attached to an Edge or a
// Group is ever set.
export function validateOrientation(orientation) {
    return !!orientation && isFinite(orientation[0]) && isFinite(orientation[1]);
}
/*
    // NOTE: PathVisio-Java appears to try to avoid making an edge
    // terminate into another edge at an approach angle of anything
    // less than about 30 deg.
    if (endPoint.hasOwnProperty("isAttachedTo")) {
      const referencedEndPath = new SmartPath(endEntity.points, endEntity);
      const angleOfReferencedEdgeAtPointOnEdge = referencedEndPath.position(
        startPoint.attachmentDisplay.position[0]
      ).angle;
      if (
        Math.abs(
          START_SIDE_TO_EMANATION_ANGLE_MAPPINGS[endSide] -
            angleOfReferencedEdgeAtPointOnEdge
        ) <
        30 * (Math.PI / 180)
      ) {
        // edge1 is almost parallel with edge2, making it hard to read, so we need to recalculate.
        endPoint.orientation = getOrientationOfHyperedgeEndPoint(
          endEntity,
          endPoint,
          startPoint
        );
        return getAndCompareSides(startPoint, endPoint, endEntity);
      }
    }
//*/
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