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[956] Implement bordered snap to parent container
Bug: #956 Signed-off-by: Laurent Fasani <laurent.fasani@obeo.fr>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,111 @@ | ||
| /******************************************************************************* | ||
| * Copyright (c) 2022 THALES GLOBAL SERVICES. | ||
| * This program and the accompanying materials | ||
| * are made available under the terms of the Eclipse Public License v2.0 | ||
| * which accompanies this distribution, and is available at | ||
| * https://www.eclipse.org/legal/epl-2.0/ | ||
| * | ||
| * SPDX-License-Identifier: EPL-2.0 | ||
| * | ||
| * Contributors: | ||
| * Obeo - initial API and implementation | ||
| *******************************************************************************/ | ||
| import { Bounds, Point } from 'sprotty'; | ||
|
|
||
| export enum RectangleSide { | ||
| 'north', | ||
| 'south', | ||
| 'west', | ||
| 'east', | ||
| } | ||
| /** | ||
| * Returns the distance between the point p and the segment made of p1 and p2 | ||
| * @param p the point | ||
| * @param p1 the first point of the segment | ||
| * @param p2 the second point of the segment | ||
| */ | ||
| export function closestPointOnSegment(p: Point, p1: Point, p2: Point): Point { | ||
| var A = p.x - p1.x; | ||
| var B = p.y - p1.y; | ||
| var C = p2.x - p1.x; | ||
| var D = p2.y - p1.y; | ||
|
|
||
| var dot = A * C + B * D; | ||
| var lengthSquare = C * C + D * D; | ||
| // param is the projection distance from p1 on the segment. This is the fraction of the segment that p is closest to. | ||
| var param = -1; | ||
| if (lengthSquare != 0) | ||
| //if the line has 0 length | ||
| param = dot / lengthSquare; | ||
|
|
||
| var nearestPoint: Point = p1; | ||
|
|
||
| if (param < 0) { | ||
| // The point is not "in front of" the segment. It is "away" on the p1 side | ||
| nearestPoint = { x: p1.x, y: p1.y }; | ||
| } else if (param > 1) { | ||
| // The point is not "in front of" the segment. It is "away" on the p1 side | ||
| nearestPoint = { x: p2.x, y: p2.y }; | ||
| } else { | ||
| // The point is "in front of" the segment | ||
| // get the projection of p on the segment | ||
| nearestPoint = { x: p1.x + param * C, y: p1.y + param * D }; | ||
| } | ||
|
|
||
| return nearestPoint; | ||
| } | ||
|
|
||
| export interface SnapToRectangleInfo { | ||
| pointOnRectangleSide: Point; | ||
| side: RectangleSide; | ||
| } | ||
|
|
||
| /** | ||
| * Returns a point on the rectangle that is the closest from the given p point. | ||
| */ | ||
| export const snapToRectangle = (point: Point, rectangle: Bounds): SnapToRectangleInfo => { | ||
| const upperLeftCorner: Point = { x: rectangle.x, y: rectangle.y }; | ||
| const upperRightCorner: Point = { x: rectangle.x + rectangle.width, y: rectangle.y }; | ||
| const bottomLeftCorner: Point = { x: rectangle.x, y: rectangle.y + rectangle.height }; | ||
| const bottomRightCorner: Point = { x: rectangle.x + rectangle.width, y: rectangle.y + rectangle.height }; | ||
|
|
||
| let closestPointInfo = computeClosestPoint(null, point, upperLeftCorner, upperRightCorner, RectangleSide.north); | ||
| closestPointInfo = computeClosestPoint( | ||
| closestPointInfo, | ||
| point, | ||
| upperRightCorner, | ||
| bottomRightCorner, | ||
| RectangleSide.east | ||
| ); | ||
| closestPointInfo = computeClosestPoint( | ||
| closestPointInfo, | ||
| point, | ||
| bottomRightCorner, | ||
| bottomLeftCorner, | ||
| RectangleSide.south | ||
| ); | ||
| closestPointInfo = computeClosestPoint( | ||
| closestPointInfo, | ||
| point, | ||
| bottomLeftCorner, | ||
| upperLeftCorner, | ||
| RectangleSide.west | ||
| ); | ||
|
|
||
| return { pointOnRectangleSide: closestPointInfo.pointOnSegment, side: closestPointInfo.side }; | ||
| }; | ||
|
|
||
| function computeClosestPoint(current, p: Point, p1: Point, p2: Point, side: RectangleSide) { | ||
| const pointOnSegment: Point = closestPointOnSegment(p, p1, p2); | ||
| let distanceSquare = getDistanceSquare(p, pointOnSegment); | ||
| if (current != null && distanceSquare > current.distanceSquare) { | ||
| return { pointOnSegment: current.pointOnSegment, distanceSquare: current.distanceSquare, side: current.side }; | ||
| } | ||
| return { pointOnSegment, distanceSquare, side }; | ||
| } | ||
|
|
||
| function getDistanceSquare(p1: Point, p2: Point): number { | ||
| var dx = p1.x - p2.x; | ||
| var dy = p1.y - p2.y; | ||
| return dx * dx + dy * dy; | ||
| } |