@foblex/flow/esm2022/f-connection/common/domain/f-segment.path-builder.mjs

An Angular library designed to simplify the creation and manipulation of dynamic flow. Provides components for flows, nodes, and connections, automating node manipulation and inter-node connections.

import { PointExtensions } from '@foblex/2d';
import { EFConnectableSide } from '../../../f-connectors';
import { CalculateCenterBetweenPointsHandler, CalculateCenterBetweenPointsRequest } from './calculate-center-between-points';
import { CalculateConnectionCenterHandler, CalculateConnectionCenterRequest } from './calculate-connection-center';
const CONNECTOR_SIDE_POINT = {
    [EFConnectableSide.LEFT]: PointExtensions.initialize(-1, 0),
    [EFConnectableSide.RIGHT]: PointExtensions.initialize(1, 0),
    [EFConnectableSide.TOP]: PointExtensions.initialize(0, -1),
    [EFConnectableSide.BOTTOM]: PointExtensions.initialize(0, 1),
    [EFConnectableSide.AUTO]: PointExtensions.initialize(0, 0),
};
export class FSegmentPathBuilder {
    handle(request) {
        const { source, sourceSide, target, targetSide } = request;
        const { points, center } = this.getPathPoints(source, sourceSide, target, targetSide, request.offset);
        const path = this.buildPath(points, request.radius);
        const penultimatePoint = points.length > 1 ? points[points.length - 2] : source;
        return { path, connectionCenter: center, penultimatePoint };
    }
    getPathPoints(source, sourceSide, target, targetSide, offset) {
        const sourceDirection = CONNECTOR_SIDE_POINT[sourceSide];
        const targetDirection = CONNECTOR_SIDE_POINT[targetSide];
        const sourceGap = { x: source.x + sourceDirection.x * offset, y: source.y + sourceDirection.y * offset };
        const targetGap = { x: target.x + targetDirection.x * offset, y: target.y + targetDirection.y * offset };
        const direction = this.getDirection(sourceGap, sourceSide, targetGap);
        const directionAccessor = direction.x !== 0 ? 'x' : 'y';
        const currentDirection = direction[directionAccessor];
        let points = [];
        const sourceGapOffset = PointExtensions.initialize();
        const targetGapOffset = PointExtensions.initialize();
        const centerBetweenPoints = new CalculateCenterBetweenPointsHandler().handle(new CalculateCenterBetweenPointsRequest(source, target));
        if (sourceDirection[directionAccessor] * targetDirection[directionAccessor] === -1) {
            const verticalSplit = [
                { x: centerBetweenPoints.x, y: sourceGap.y },
                { x: centerBetweenPoints.x, y: targetGap.y },
            ];
            const horizontalSplit = [
                { x: sourceGap.x, y: centerBetweenPoints.y },
                { x: targetGap.x, y: centerBetweenPoints.y },
            ];
            if (sourceDirection[directionAccessor] === currentDirection) {
                points = directionAccessor === 'x' ? verticalSplit : horizontalSplit;
            }
            else {
                points = directionAccessor === 'x' ? horizontalSplit : verticalSplit;
            }
        }
        else {
            const sourceTarget = [{ x: sourceGap.x, y: targetGap.y }];
            const targetSource = [{ x: targetGap.x, y: sourceGap.y }];
            if (directionAccessor === 'x') {
                points = sourceDirection.x === currentDirection ? targetSource : sourceTarget;
            }
            else {
                points = sourceDirection.y === currentDirection ? sourceTarget : targetSource;
            }
            if (sourceSide === targetSide) {
                const diff = Math.abs(source[directionAccessor] - target[directionAccessor]);
                if (diff <= offset) {
                    const gapOffset = Math.min(offset - 1, offset - diff);
                    if (sourceDirection[directionAccessor] === currentDirection) {
                        sourceGapOffset[directionAccessor] = (sourceGap[directionAccessor] > source[directionAccessor] ? -1 : 1) * gapOffset;
                    }
                    else {
                        targetGapOffset[directionAccessor] = (targetGap[directionAccessor] > target[directionAccessor] ? -1 : 1) * gapOffset;
                    }
                }
            }
            if (sourceSide !== targetSide) {
                const dirAccessorOpposite = directionAccessor === 'x' ? 'y' : 'x';
                const isSameDir = sourceDirection[directionAccessor] === targetDirection[dirAccessorOpposite];
                const sourceGtTargetOppo = sourceGap[dirAccessorOpposite] > targetGap[dirAccessorOpposite];
                const sourceLtTargetOppo = sourceGap[dirAccessorOpposite] < targetGap[dirAccessorOpposite];
                const flipSourceTarget = (sourceDirection[directionAccessor] === 1 &&
                    ((!isSameDir && sourceGtTargetOppo) || (isSameDir && sourceLtTargetOppo))) ||
                    (sourceDirection[directionAccessor] !== 1 &&
                        ((!isSameDir && sourceLtTargetOppo) || (isSameDir && sourceGtTargetOppo)));
                if (flipSourceTarget) {
                    points = directionAccessor === 'x' ? sourceTarget : targetSource;
                }
            }
        }
        const pathPoints = [
            source,
            { x: sourceGap.x + sourceGapOffset.x, y: sourceGap.y + sourceGapOffset.y },
            ...points,
            { x: targetGap.x + targetGapOffset.x, y: targetGap.y + targetGapOffset.y },
            target,
        ];
        const center = new CalculateConnectionCenterHandler().handle(new CalculateConnectionCenterRequest(pathPoints));
        return { points: pathPoints, center: center };
    }
    getDirection(source, sourceSide, target) {
        if (sourceSide === EFConnectableSide.LEFT || sourceSide === EFConnectableSide.RIGHT) {
            return source.x < target.x ? PointExtensions.initialize(1, 0) : PointExtensions.initialize(-1, 0);
        }
        return source.y < target.y ? PointExtensions.initialize(0, 1) : PointExtensions.initialize(0, -1);
    }
    distance(a, b) {
        return Math.sqrt(Math.pow(b.x - a.x, 2) + Math.pow(b.y - a.y, 2));
    }
    buildPath(points, borderRadius) {
        let path = '';
        for (let i = 0; i < points.length; i++) {
            const p = points[i];
            let segment = '';
            if (i > 0 && i < points.length - 1) {
                segment = this.getBend(points[i - 1], p, points[i + 1], borderRadius);
            }
            else if (i === points.length - 1) {
                segment = this.buildLastLineSegment(i, p);
            }
            else {
                segment = this.buildMoveOrLineSegment(i, p);
            }
            path += segment;
        }
        return path;
    }
    getBend(a, b, c, size) {
        const bendSize = Math.min(this.distance(a, b) / 2, this.distance(b, c) / 2, size);
        const { x, y } = b;
        if ((a.x === x && x === c.x) || (a.y === y && y === c.y)) {
            return `L${x} ${y}`;
        }
        if (a.y === y) {
            const xDir = a.x < c.x ? -1 : 1;
            const yDir = a.y < c.y ? 1 : -1;
            return `L ${x + bendSize * xDir},${y}Q ${x},${y} ${x},${y + bendSize * yDir}`;
        }
        const xDir = a.x < c.x ? 1 : -1;
        const yDir = a.y < c.y ? -1 : 1;
        return `L ${x},${y + bendSize * yDir}Q ${x},${y} ${x + bendSize * xDir},${y}`;
    }
    buildMoveOrLineSegment(index, point) {
        return `${index === 0 ? 'M' : 'L'}${point.x} ${point.y}`;
    }
    buildLastLineSegment(index, point) {
        return `L${point.x + 0.0002} ${point.y + 0.0002}`;
    }
}
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{ IPoint, PointExtensions } from '@foblex/2d';\nimport { EFConnectableSide } from '../../../f-connectors';\nimport {\n  CalculateCenterBetweenPointsHandler,\n  CalculateCenterBetweenPointsRequest\n} from './calculate-center-between-points';\nimport { CalculateConnectionCenterHandler, CalculateConnectionCenterRequest } from './calculate-connection-center';\nimport {\n  IFConnectionBuilder,\n  IFConnectionBuilderRequest,\n  IFConnectionBuilderResponse\n} from '../../f-connection-builder';\nimport { IMap } from '../../../domain';\n\nconst CONNECTOR_SIDE_POINT: IMap<IPoint> = {\n\n  [ EFConnectableSide.LEFT ]: PointExtensions.initialize(-1, 0),\n\n  [ EFConnectableSide.RIGHT ]: PointExtensions.initialize(1, 0),\n\n  [ EFConnectableSide.TOP ]: PointExtensions.initialize(0, -1),\n\n  [ EFConnectableSide.BOTTOM ]: PointExtensions.initialize(0, 1),\n\n  [ EFConnectableSide.AUTO ]: PointExtensions.initialize(0, 0),\n};\n\nexport class FSegmentPathBuilder implements IFConnectionBuilder {\n\n  public handle(request: IFConnectionBuilderRequest): IFConnectionBuilderResponse {\n    const { source, sourceSide, target, targetSide } = request;\n\n    const { points, center } = this.getPathPoints(\n        source,\n        sourceSide,\n        target,\n        targetSide,\n        request.offset\n    );\n\n    const path = this.buildPath(points, request.radius);\n\n    const penultimatePoint = points.length > 1 ? points[ points.length - 2 ] : source;\n\n    return { path, connectionCenter: center, penultimatePoint };\n  }\n\n  private getPathPoints(\n      source: IPoint, sourceSide: EFConnectableSide, target: IPoint, targetSide: EFConnectableSide, offset: number\n  ): { points: IPoint[], center: IPoint } {\n\n    const sourceDirection = CONNECTOR_SIDE_POINT[ sourceSide ];\n    const targetDirection = CONNECTOR_SIDE_POINT[ targetSide ];\n\n    const sourceGap: IPoint = { x: source.x + sourceDirection.x * offset, y: source.y + sourceDirection.y * offset };\n    const targetGap: IPoint = { x: target.x + targetDirection.x * offset, y: target.y + targetDirection.y * offset };\n\n    const direction = this.getDirection(sourceGap, sourceSide, targetGap);\n    const directionAccessor = direction.x !== 0 ? 'x' : 'y';\n    const currentDirection = direction[ directionAccessor ];\n\n    let points: IPoint[] = [];\n    const sourceGapOffset = PointExtensions.initialize();\n    const targetGapOffset = PointExtensions.initialize();\n\n    const centerBetweenPoints = new CalculateCenterBetweenPointsHandler().handle(\n        new CalculateCenterBetweenPointsRequest(source, target)\n    );\n\n    if (sourceDirection[ directionAccessor ] * targetDirection[ directionAccessor ] === -1) {\n      const verticalSplit: IPoint[] = [\n        { x: centerBetweenPoints.x, y: sourceGap.y },\n        { x: centerBetweenPoints.x, y: targetGap.y },\n      ];\n      const horizontalSplit: IPoint[] = [\n        { x: sourceGap.x, y: centerBetweenPoints.y },\n        { x: targetGap.x, y: centerBetweenPoints.y },\n      ];\n\n      if (sourceDirection[ directionAccessor ] === currentDirection) {\n        points = directionAccessor === 'x' ? verticalSplit : horizontalSplit;\n      } else {\n        points = directionAccessor === 'x' ? horizontalSplit : verticalSplit;\n      }\n    } else {\n      const sourceTarget: IPoint[] = [ { x: sourceGap.x, y: targetGap.y } ];\n      const targetSource: IPoint[] = [ { x: targetGap.x, y: sourceGap.y } ];\n\n      if (directionAccessor === 'x') {\n        points = sourceDirection.x === currentDirection ? targetSource : sourceTarget;\n      } else {\n        points = sourceDirection.y === currentDirection ? sourceTarget : targetSource;\n      }\n\n      if (sourceSide === targetSide) {\n        const diff = Math.abs(source[ directionAccessor ] - target[ directionAccessor ]);\n\n        if (diff <= offset) {\n          const gapOffset = Math.min(offset - 1, offset - diff);\n          if (sourceDirection[ directionAccessor ] === currentDirection) {\n            sourceGapOffset[ directionAccessor ] = (sourceGap[ directionAccessor ] > source[ directionAccessor ] ? -1 : 1) * gapOffset;\n          } else {\n            targetGapOffset[ directionAccessor ] = (targetGap[ directionAccessor ] > target[ directionAccessor ] ? -1 : 1) * gapOffset;\n          }\n        }\n      }\n\n      if (sourceSide !== targetSide) {\n        const dirAccessorOpposite = directionAccessor === 'x' ? 'y' : 'x';\n        const isSameDir = sourceDirection[ directionAccessor ] === targetDirection[ dirAccessorOpposite ];\n        const sourceGtTargetOppo = sourceGap[ dirAccessorOpposite ] > targetGap[ dirAccessorOpposite ];\n        const sourceLtTargetOppo = sourceGap[ dirAccessorOpposite ] < targetGap[ dirAccessorOpposite ];\n        const flipSourceTarget =\n            (sourceDirection[ directionAccessor ] === 1 &&\n                ((!isSameDir && sourceGtTargetOppo) || (isSameDir && sourceLtTargetOppo))) ||\n            (sourceDirection[ directionAccessor ] !== 1 &&\n                ((!isSameDir && sourceLtTargetOppo) || (isSameDir && sourceGtTargetOppo)));\n\n        if (flipSourceTarget) {\n          points = directionAccessor === 'x' ? sourceTarget : targetSource;\n        }\n      }\n    }\n\n    const pathPoints = [\n      source,\n      { x: sourceGap.x + sourceGapOffset.x, y: sourceGap.y + sourceGapOffset.y },\n      ...points,\n      { x: targetGap.x + targetGapOffset.x, y: targetGap.y + targetGapOffset.y },\n      target,\n    ];\n\n    const center = new CalculateConnectionCenterHandler().handle(\n        new CalculateConnectionCenterRequest(pathPoints)\n    );\n\n    return { points: pathPoints, center: center };\n  }\n\n  private getDirection(source: IPoint, sourceSide: EFConnectableSide, target: IPoint): IPoint {\n    if (sourceSide === EFConnectableSide.LEFT || sourceSide === EFConnectableSide.RIGHT) {\n      return source.x < target.x ? PointExtensions.initialize(1, 0) : PointExtensions.initialize(-1, 0);\n    }\n    return source.y < target.y ? PointExtensions.initialize(0, 1) : PointExtensions.initialize(0, -1);\n  }\n\n  private distance(a: IPoint, b: IPoint): number {\n    return Math.sqrt(Math.pow(b.x - a.x, 2) + Math.pow(b.y - a.y, 2));\n  }\n\n  private buildPath(points: IPoint[], borderRadius: number): string {\n    let path = '';\n    for (let i = 0; i < points.length; i++) {\n      const p = points[ i ];\n      let segment = '';\n\n      if (i > 0 && i < points.length - 1) {\n        segment = this.getBend(points[ i - 1 ], p, points[ i + 1 ], borderRadius);\n      } else if (i === points.length - 1) {\n        segment = this.buildLastLineSegment(i, p);\n      } else {\n        segment = this.buildMoveOrLineSegment(i, p);\n      }\n      path += segment;\n    }\n\n    return path;\n  }\n\n  private getBend(a: IPoint, b: IPoint, c: IPoint, size: number): string {\n    const bendSize = Math.min(this.distance(a, b) / 2, this.distance(b, c) / 2, size);\n    const { x, y } = b;\n\n    if ((a.x === x && x === c.x) || (a.y === y && y === c.y)) {\n      return `L${ x } ${ y }`;\n    }\n\n    if (a.y === y) {\n      const xDir = a.x < c.x ? -1 : 1;\n      const yDir = a.y < c.y ? 1 : -1;\n      return `L ${ x + bendSize * xDir },${ y }Q ${ x },${ y } ${ x },${ y + bendSize * yDir }`;\n    }\n\n    const xDir = a.x < c.x ? 1 : -1;\n    const yDir = a.y < c.y ? -1 : 1;\n    return `L ${ x },${ y + bendSize * yDir }Q ${ x },${ y } ${ x + bendSize * xDir },${ y }`;\n  }\n\n  private buildMoveOrLineSegment(index: number, point: IPoint): string {\n    return `${ index === 0 ? 'M' : 'L' }${ point.x } ${ point.y }`;\n  }\n\n  private buildLastLineSegment(index: number, point: IPoint): string {\n    return `L${ point.x + 0.0002 } ${ point.y + 0.0002 }`;\n  }\n}\n"]}