editor/crop/CropShow.ts

/*
 * Copyright (c) 2022 Huawei Device Co., Ltd.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import { LineSegment } from '../base/Line';
import { Point } from '../base/Point';
import { RectF } from '../base/Rect';
import { Ratio } from '../base/Ratio';
import { Log } from '@ohos/base/src/main/ets/utils/Log';
import { CropRatioType, CropAngle } from './CropType';
import { MathUtils } from './MathUtils';
import  screenManager  from '@ohos/base/src/main/ets/manager/ScreenManager';

export class CropShow {
    private TAG: string = 'CropShow';
    private static readonly DEFAULT_MIN_SIDE_LENGTH: number = 90;
    private static readonly DEFAULT_TOUCH_BOUND: number = 20;
    private static readonly BASE_SCALE_VALUE: number = 1.0;
    private limitRect: RectF = undefined;
    private cropRect: RectF = undefined;
    private imageRect: RectF = undefined;
    private ratio: Ratio = undefined;
    private screenMaxSide: number = 0;
    private screenMinSide: number = 0;
    private minSideLength: number = CropShow.DEFAULT_MIN_SIDE_LENGTH;
    private touchBound: number = CropShow.DEFAULT_TOUCH_BOUND;
    private rotationAngle: number = 0;
    private horizontalAngle: number = 0;
    private maxScaleFactorW: number = CropShow.BASE_SCALE_VALUE;
    private maxScaleFactorH: number = CropShow.BASE_SCALE_VALUE;
    private isFlipHorizontal: boolean = false;
    private isFlipVertically: boolean = false;
    private isLeft: boolean = false;
    private isRight: boolean = false;
    private isTop: boolean = false;
    private isBottom: boolean = false;
    private isHorizontalSide: boolean = false;
    private isVerticalSide: boolean = false;

    constructor() {
        this.limitRect = new RectF();
        this.imageRect = new RectF();
        this.cropRect = new RectF();
        this.ratio = new Ratio(-1, -1);

        let screenWidth = Math.ceil(screenManager.getWinWidth());
        let screenHeight = Math.ceil(screenManager.getWinHeight());
        this.screenMaxSide = Math.max(screenWidth, screenHeight);
        this.screenMinSide = Math.min(screenWidth, screenHeight);
    }

    init(limit: RectF, imageRatio: number) {
        this.limitRect.set(limit.left, limit.top, limit.right, limit.bottom);
        MathUtils.computeMaxRectWithinLimit(this.imageRect, limit, imageRatio);
        this.cropRect.set(this.imageRect.left, this.imageRect.top, this.imageRect.right, this.imageRect.bottom);
        this.ratio.set(-1, -1);
        this.rotationAngle = 0;
        this.horizontalAngle = 0;
        this.isFlipHorizontal = false;
        this.isFlipVertically = false;
    }

    syncLimitRect(limit: RectF) {
        this.limitRect.set(limit.left, limit.top, limit.right, limit.bottom);
        this.enlargeCropArea();
    }

    getCropRect(): RectF {
        let crop = new RectF();
        crop.set(this.cropRect.left, this.cropRect.top, this.cropRect.right, this.cropRect.bottom);
        return crop;
    }

    getImageRect(): RectF {
        let image = new RectF();
        image.set(this.imageRect.left, this.imageRect.top, this.imageRect.right, this.imageRect.bottom);
        return image;
    }

    setImageRect(image: RectF) {
        this.imageRect.set(image.left, image.top, image.right, image.bottom);
    }

    syncRotationAngle(angle: number) {
        this.rotationAngle = angle;
        MathUtils.swapWidthHeight(this.cropRect);
        this.swapCurrentRatio();
        this.enlargeCropArea();
    }

    private swapCurrentRatio() {
        let W = this.ratio.getW();
        let H = this.ratio.getH();
        this.ratio.set(H, W);
    }

    private getDisplayCenter(): Point {
        return new Point(this.limitRect.getCenterX(), this.limitRect.getCenterY());
    }

    syncHorizontalAngle(angle: number) {
        this.horizontalAngle = angle;

        let points = MathUtils.rectToPoints(this.cropRect);
        let origin = this.getDisplayCenter();
        let totalAngle = -(this.rotationAngle + this.horizontalAngle);
        let rotated = MathUtils.rotatePoints(points, totalAngle, origin);
        let scale = MathUtils.findSuitableScale(rotated, this.imageRect, origin);
        MathUtils.scaleRectBasedOnPoint(this.imageRect, origin, scale);
    }

    setFlip(isFlipHorizontal: boolean, isFlipVertically: boolean) {
        this.isFlipHorizontal = isFlipHorizontal;
        this.isFlipVertically = isFlipVertically;
    }

    setRatio(ratio: CropRatioType) {
        switch (ratio) {
            case CropRatioType.RATIO_TYPE_FREE:
                this.ratio.set(-1, -1);
                break;
            case CropRatioType.RATIO_TYPE_HORIZONTAL:
                this.ratio.set(this.screenMaxSide, this.screenMinSide);
                break;
            case CropRatioType.RATIO_TYPE_VERTICAL:
                this.ratio.set(this.screenMinSide, this.screenMaxSide);
                break;
            case CropRatioType.RATIO_TYPE_1_1:
                this.ratio.set(1, 1);
                break;
            case CropRatioType.RATIO_TYPE_16_9:
                this.ratio.set(16, 9);
                break;
            case CropRatioType.RATIO_TYPE_9_16:
                this.ratio.set(9, 16);
                break;
            case CropRatioType.RATIO_TYPE_4_3:
                this.ratio.set(4, 3);
                break;
            case CropRatioType.RATIO_TYPE_3_4:
                this.ratio.set(3, 4);
                break;
            case CropRatioType.RATIO_TYPE_3_2:
                this.ratio.set(3, 2);
                break;
            case CropRatioType.RATIO_TYPE_2_3:
                this.ratio.set(2, 3);
                break;
            default:
               Log.warn(this.TAG, 'setRatio: unknown ratio');
                break;
        }
        if (this.ratio.isValid()) {
            MathUtils.computeMaxRectWithinLimit(this.cropRect, this.limitRect, this.ratio.getRate());
            let imageLines = this.getCurrentImageLines();
            MathUtils.limitRectInRotated(this.cropRect, imageLines);
            this.imageCropCompare();
            this.enlargeCropArea();
        }
    }

    setMaxScaleFactor(factorW: number, factorH: number) {
        this.maxScaleFactorW = factorW;
        this.maxScaleFactorH = factorH;
    }

    couldEnlargeImage(): boolean {
        return (this.couldEnlargeImageW() && this.couldEnlargeImageH());
    }

    private couldEnlargeImageW(): boolean {
        let scaleFactorW = this.imageRect.getWidth() / this.cropRect.getWidth();
        return (scaleFactorW >= this.maxScaleFactorW ? false : true);
    }

    private couldEnlargeImageH(): boolean {
        let scaleFactorH = this.imageRect.getHeight() / this.cropRect.getHeight();
        return (scaleFactorH >= this.maxScaleFactorH ? false : true);
    }

    enlargeCropArea() {
        let newCrop = new RectF();
        let cropRatio = this.cropRect.getWidth() / this.cropRect.getHeight();
        MathUtils.computeMaxRectWithinLimit(newCrop, this.limitRect, cropRatio);
        let scale = newCrop.getWidth() / this.cropRect.getWidth();

        let tX = this.isFlipHorizontal ? -1 : 1;
        let tY = this.isFlipVertically ? -1 : 1;
        let origin = this.getDisplayCenter();
        let preCenterX = this.cropRect.getCenterX() * tX + (this.isFlipHorizontal ? 2 * origin.x : 0);
        let preCenterY = this.cropRect.getCenterY() * tY + (this.isFlipVertically ? 2 * origin.y : 0);
        let preCenter = new Point(preCenterX, preCenterY);
        let angle = this.rotationAngle * tX * tY + this.horizontalAngle;
        let rotated = MathUtils.rotatePoints([preCenter], -angle, origin);

        MathUtils.scaleRectBasedOnPoint(this.imageRect, rotated[0], scale);

        let offsetX = newCrop.getCenterX() - preCenter.x;
        let offsetY = newCrop.getCenterY() - preCenter.y;
        let alpha = MathUtils.formulaAngle(angle);
        let x = Math.cos(alpha) * offsetX + Math.sin(alpha) * offsetY;
        let y = -Math.sin(alpha) * offsetX + Math.cos(alpha) * offsetY;
        this.imageRect.move(x, y);

        this.cropRect.set(newCrop.left, newCrop.top, newCrop.right, newCrop.bottom);
    }

    imageCropCompare(): void {
        let imageRect = this.getImageRect();
        let cropRect = this.getCropRect();
        let imageRectWidth = imageRect.getWidth();
        let imageRectHeight = imageRect.getHeight();
        let cropRectWidth = cropRect.getWidth();
        let cropRectHeight = cropRect.getHeight();
        if (imageRectWidth < cropRectWidth) {
            let scaleRatio = cropRectWidth / imageRectWidth;
            this.imageRect.scale(scaleRatio);
        }
        if (imageRectHeight < cropRectHeight) {
            let scaleRatio = cropRectHeight / imageRectHeight;
            this.imageRect.scale(scaleRatio);
        }

    }

    isCropRectTouch(x: number, y: number): boolean {
        let w = this.touchBound;
        let h = this.touchBound;
        let crop = { ...this.cropRect };
        let outer = new RectF();
        outer.set(crop.left - w, crop.top - h, crop.right + w, crop.bottom + h);
        let inner = new RectF();
        inner.set(crop.left + w, crop.top + h, crop.right - w, crop.bottom - h);
        if (outer.isInRect(x, y) && !inner.isInRect(x, y)) {
            if (x <= inner.left) {
                this.isLeft = true;
            } else if (x >= inner.right) {
                this.isRight = true;
            }

            if (y <= inner.top) {
                this.isTop = true;
            } else if (y >= inner.bottom) {
                this.isBottom = true;
            }

            // convert side to conner, when fixed crop ratio
            if (this.ratio.isValid()) {
                this.fixSideToConner(x, y);
            }
            Log.debug(this.TAG, `isCropTouch: l[${this.isLeft}] r[${this.isRight}] t[${this.isTop}] b[${this.isBottom}]`);
        }
        return this.isLeft || this.isRight || this.isTop || this.isBottom;
    }

    private fixSideToConner(x: number, y: number) {
        if ((this.isLeft || this.isRight) && !this.isTop && !this.isBottom) {
            if (y < this.cropRect.getCenterY()) {
                this.isTop = true;
            } else {
                this.isBottom = true;
            }
            this.isVerticalSide = true;
        } else if ((this.isTop || this.isBottom) && !this.isLeft && !this.isRight) {
            if (x < this.cropRect.getCenterX()) {
                this.isLeft = true;
            } else {
                this.isRight = true;
            }
            this.isHorizontalSide = true;
        }
    }

    getCurrentFlipImage(): RectF {
        let center = this.getDisplayCenter();
        let image = { ...this.imageRect };
        let flipImage = new RectF();
        flipImage.left = this.isFlipHorizontal ? (2 * center.x - image.right) : image.left;
        flipImage.top = this.isFlipVertically ? (2 * center.y - image.bottom) : image.top;
        flipImage.right = this.isFlipHorizontal ? (2 * center.x - image.left) : image.right;
        flipImage.bottom = this.isFlipVertically ? (2 * center.y - image.top) : image.bottom;
        return flipImage;
    }

    private getCurrentRotatedImage(): RectF {
        let flipImage = this.getCurrentFlipImage();
        let points = MathUtils.rectToPoints(flipImage);
        let origin = this.getDisplayCenter();
        let rotated = MathUtils.rotatePoints(points, this.rotationAngle, origin);
        let i = Math.abs(this.rotationAngle / CropAngle.ONE_QUARTER_CIRCLE_ANGLE);
        let j = (i + 2) % rotated.length;
        let image = new RectF();
        image.set(rotated[i].x, rotated[i].y, rotated[j].x, rotated[j].y);
        return image;
    }

    private getCurrentImageLines(): Array<LineSegment> {
        let flipImage = this.getCurrentFlipImage();
        let imagePoints = MathUtils.rectToPoints(flipImage);
        let origin = this.getDisplayCenter();
        let tX = this.isFlipHorizontal ? -1 : 1;
        let tY = this.isFlipVertically ? -1 : 1;
        let angle = this.rotationAngle * tX * tY + this.horizontalAngle;
        let rotated = MathUtils.rotatePoints(imagePoints, angle, origin);

        let imageLines = [];
        for (let i = 0; i < rotated.length; i++) {
            let j = (i + 1) % rotated.length;
            imageLines.push(
                new LineSegment(new Point(rotated[i].x, rotated[i].y), new Point(rotated[j].x, rotated[j].y)));
        }
        return imageLines;
    }

    moveCropRect(offsetX: number, offsetY: number) {
        // crop rect in fixed mode
        if (this.ratio.isValid()) {
            this.moveInFixedMode(offsetX, offsetY);
        } else {
            this.moveInFreeMode(offsetX, offsetY);
        }
    }

    private moveInFixedMode(offsetX: number, offsetY: number) {
        let x = offsetX;
        let y = offsetY;
        if (this.isHorizontalSide) {
            x = 0;
        } else if (this.isVerticalSide) {
            y = 0;
        }
        let offsetHypot = Math.hypot(x, y);

        if (this.isLeft && this.isTop) {
            // left top conner move
            let isEnlarge = offsetX < 0 || offsetY < 0;
            if (isEnlarge || this.couldEnlargeImage()) {
                this.fixLeftTopInFixedMode(offsetHypot, isEnlarge);
            }
        } else if (this.isLeft && this.isBottom) {
            // left bottom conner move
            let isEnlarge = offsetX < 0 || offsetY > 0;
            if (isEnlarge || this.couldEnlargeImage()) {
                this.fixLeftBottomInFixedMode(offsetHypot, isEnlarge);
            }
        } else if (this.isRight && this.isTop) {
            // right top conner move
            let isEnlarge = offsetX > 0 || offsetY < 0;
            if (isEnlarge || this.couldEnlargeImage()) {
                this.fixRightTopInFixedMode(offsetHypot, isEnlarge);
            }
        } else if (this.isRight && this.isBottom) {
            // right bottom conner move
            let isEnlarge = offsetX > 0 || offsetY > 0;
            if (isEnlarge || this.couldEnlargeImage()) {
                this.fixRightBottomInFixedMode(offsetHypot, isEnlarge);
            }
        }
    }

    private fixLeftTopInFixedMode(offsetHypot: number, isEnlarge: boolean) {
        let crop = this.getCropRect();
        let rate = this.ratio.getRate();
        let rect = new RectF();
        if (isEnlarge) {
            let limit = { ...this.limitRect };
            let size = MathUtils.getMaxFixedRectSize(rate, crop.right - limit.left, crop.bottom - limit.top);
            rect.set(crop.right - size[0], crop.bottom - size[1], crop.right, crop.bottom);
            let imageLines = this.getCurrentImageLines();
            MathUtils.limitRectInRotatedBasedOnPoint(2, rect, imageLines);
        } else {
            let size = MathUtils.getMinFixedRectSize(rate, this.minSideLength);
            rect.set(crop.right - size[0], crop.bottom - size[1], crop.right, crop.bottom);
        }
        let rectHypot = Math.hypot(rect.getWidth(), rect.getHeight());
        let cropHypot = Math.hypot(crop.getWidth(), crop.getHeight());
        let limitHypot = (rectHypot - cropHypot) * (isEnlarge ? 1 : -1);
        let finalOffsetHypot = Math.min(offsetHypot, Math.max(limitHypot, 0));
        let tX = isEnlarge ? -1 : 1;
        let tY = isEnlarge ? -1 : 1;
        let ratioHypot = Math.hypot(this.ratio.getW(), this.ratio.getH());
        this.cropRect.left += finalOffsetHypot * tX * this.ratio.getW() / ratioHypot;
        this.cropRect.top += finalOffsetHypot * tY * this.ratio.getH() / ratioHypot;
    }

    private fixLeftBottomInFixedMode(offsetHypot: number, isEnlarge: boolean) {
        let crop = this.getCropRect();
        let rate = this.ratio.getRate();
        let rect = new RectF();
        if (isEnlarge) {
            let limit = { ...this.limitRect };
            let size = MathUtils.getMaxFixedRectSize(rate, crop.right - limit.left, limit.bottom - crop.top);
            rect.set(crop.right - size[0], crop.top, crop.right, crop.top + size[1]);
            let imageLines = this.getCurrentImageLines();
            MathUtils.limitRectInRotatedBasedOnPoint(1, rect, imageLines);
        } else {
            let size = MathUtils.getMinFixedRectSize(rate, this.minSideLength);
            rect.set(crop.right - size[0], crop.top, crop.right, crop.top + size[1]);
        }
        let rectHypot = Math.hypot(rect.getWidth(), rect.getHeight());
        let cropHypot = Math.hypot(crop.getWidth(), crop.getHeight());
        let limitHypot = (rectHypot - cropHypot) * (isEnlarge ? 1 : -1);
        let finalOffsetHypot = Math.min(offsetHypot, Math.max(limitHypot, 0));
        let tX = isEnlarge ? -1 : 1;
        let tY = isEnlarge ? 1 : -1;
        let ratioHypot = Math.hypot(this.ratio.getW(), this.ratio.getH());
        this.cropRect.left += finalOffsetHypot * tX * this.ratio.getW() / ratioHypot;
        this.cropRect.bottom += finalOffsetHypot * tY * this.ratio.getH() / ratioHypot;
    }

    private fixRightTopInFixedMode(offsetHypot: number, isEnlarge: boolean) {
        let crop = this.getCropRect();
        let rate = this.ratio.getRate();
        let rect = new RectF();
        if (isEnlarge) {
            let limit = { ...this.limitRect };
            let size = MathUtils.getMaxFixedRectSize(rate, limit.right - crop.left, crop.bottom - limit.top);
            rect.set(crop.left, crop.bottom - size[1], crop.left + size[0], crop.bottom);
            let imageLines = this.getCurrentImageLines();
            MathUtils.limitRectInRotatedBasedOnPoint(3, rect, imageLines);
        } else {
            let size = MathUtils.getMinFixedRectSize(rate, this.minSideLength);
            rect.set(crop.left, crop.bottom - size[1], crop.left + size[0], crop.bottom);
        }
        let rectHypot = Math.hypot(rect.getWidth(), rect.getHeight());
        let cropHypot = Math.hypot(crop.getWidth(), crop.getHeight());
        let limitHypot = (rectHypot - cropHypot) * (isEnlarge ? 1 : -1);
        let finalOffsetHypot = Math.min(offsetHypot, Math.max(limitHypot, 0));
        let tX = isEnlarge ? 1 : -1;
        let tY = isEnlarge ? -1 : 1;
        let ratioHypot = Math.hypot(this.ratio.getW(), this.ratio.getH());
        this.cropRect.right += finalOffsetHypot * tX * this.ratio.getW() / ratioHypot;
        this.cropRect.top += finalOffsetHypot * tY * this.ratio.getH() / ratioHypot;
    }

    private fixRightBottomInFixedMode(offsetHypot: number, isEnlarge: boolean) {
        let crop = this.getCropRect();
        let rate = this.ratio.getRate();
        let rect = new RectF();
        if (isEnlarge) {
            let limit = { ...this.limitRect };
            let size = MathUtils.getMaxFixedRectSize(rate, limit.right - crop.left, limit.bottom - crop.top);
            rect.set(crop.left, crop.top, crop.left + size[0], crop.top + size[1]);
            let imageLines = this.getCurrentImageLines();
            MathUtils.limitRectInRotatedBasedOnPoint(0, rect, imageLines);
        } else {
            let size = MathUtils.getMinFixedRectSize(rate, this.minSideLength);
            rect.set(crop.left, crop.top, crop.left + size[0], crop.top + size[1]);
        }
        let rectHypot = Math.hypot(rect.getWidth(), rect.getHeight());
        let cropHypot = Math.hypot(crop.getWidth(), crop.getHeight());
        let limitHypot = (rectHypot - cropHypot) * (isEnlarge ? 1 : -1);
        let finalOffsetHypot = Math.min(offsetHypot, Math.max(limitHypot, 0));
        let tX = isEnlarge ? 1 : -1;
        let tY = isEnlarge ? 1 : -1;
        let ratioHypot = Math.hypot(this.ratio.getW(), this.ratio.getH());
        this.cropRect.right += finalOffsetHypot * tX * this.ratio.getW() / ratioHypot;
        this.cropRect.bottom += finalOffsetHypot * tY * this.ratio.getH() / ratioHypot;
    }

    private moveInFreeMode(offsetX: number, offsetY: number) {
        let crop = this.getCropRect();
        let limit = { ...this.limitRect };
        let image = this.getCurrentRotatedImage();
        let minLength = this.minSideLength;
        let imageLines = this.getCurrentImageLines();
        if (this.isLeft) {
            if (offsetX < 0 || this.couldEnlargeImageW()) {
                let left = Math.min(crop.left + offsetX, crop.right - minLength);
                left = Math.max(left, image.left, limit.left);
                this.cropRect.left = this.fixLeftInFreeMode(left, crop, imageLines);
                crop.left = this.cropRect.left;
            }
        } else if (this.isRight) {
            if (offsetX > 0 || this.couldEnlargeImageW()) {
                let right = Math.max(crop.right + offsetX, crop.left + minLength);
                right = Math.min(right, image.right, limit.right);
                this.cropRect.right = this.fixRightInFreeMode(right, crop, imageLines);
                crop.right = this.cropRect.right;
            }
        }
        if (this.isTop) {
            if (offsetY < 0 || this.couldEnlargeImageH()) {
                let top = Math.min(crop.top + offsetY, crop.bottom - minLength);
                top = Math.max(top, image.top, limit.top);
                this.cropRect.top = this.fixTopInFreeMode(top, crop, imageLines);
            }
        } else if (this.isBottom) {
            if (offsetY > 0 || this.couldEnlargeImageH()) {
                let bottom = Math.max(crop.bottom + offsetY, crop.top + minLength);
                bottom = Math.min(bottom, image.bottom, limit.bottom);
                this.cropRect.bottom = this.fixBottomInFreeMode(bottom, crop, imageLines);
            }
        }
    }

    private fixLeftInFreeMode(left: number, crop: RectF, imageLines: Array<LineSegment>): number {
        let leftLine = new LineSegment(new Point(left, crop.top), new Point(left, crop.bottom));
        let adjacentLines = [];
        adjacentLines.push(new LineSegment(new Point(left, crop.top), new Point(crop.right, crop.top)));
        adjacentLines.push(new LineSegment(new Point(left, crop.bottom), new Point(crop.right, crop.bottom)));
        let fixedLeft = left;
        for (let imageLine of imageLines) {
            if (MathUtils.hasIntersection(imageLine, leftLine)) {
                let result = this.tryToFindFixedSide(adjacentLines, imageLine, left, true, true);
                fixedLeft = Math.max(fixedLeft, result);
            }
        }
        return fixedLeft;
    }

    private fixRightInFreeMode(right: number, crop: RectF, imageLines: Array<LineSegment>): number {
        let rightLine = new LineSegment(new Point(right, crop.top), new Point(right, crop.bottom));
        let adjacentLines = [];
        adjacentLines.push(new LineSegment(new Point(crop.left, crop.top), new Point(right, crop.top)));
        adjacentLines.push(new LineSegment(new Point(crop.left, crop.bottom), new Point(right, crop.bottom)));
        let fixedRight = right;
        for (let imageLine of imageLines) {
            if (MathUtils.hasIntersection(imageLine, rightLine)) {
                let result = this.tryToFindFixedSide(adjacentLines, imageLine, right, true, false);
                fixedRight = Math.min(fixedRight, result);
            }
        }
        return fixedRight;
    }

    private fixTopInFreeMode(top: number, crop: RectF, imageLines: Array<LineSegment>): number {
        let topLine = new LineSegment(new Point(crop.left, top), new Point(crop.right, top));
        let adjacentLines = [];
        adjacentLines.push(new LineSegment(new Point(crop.left, top), new Point(crop.left, crop.bottom)));
        adjacentLines.push(new LineSegment(new Point(crop.right, top), new Point(crop.right, crop.bottom)));
        let fixedTop = top;
        for (let imageLine of imageLines) {
            if (MathUtils.hasIntersection(imageLine, topLine)) {
                let result = this.tryToFindFixedSide(adjacentLines, imageLine, top, false, true);
                fixedTop = Math.max(fixedTop, result);
            }
        }
        return fixedTop;
    }

    private fixBottomInFreeMode(bottom: number, crop: RectF, imageLines: Array<LineSegment>): number {
        let bottomLine = new LineSegment(new Point(crop.left, bottom), new Point(crop.right, bottom));
        let adjacentLines = [];
        adjacentLines.push(new LineSegment(new Point(crop.left, crop.top), new Point(crop.left, bottom)));
        adjacentLines.push(new LineSegment(new Point(crop.right, crop.top), new Point(crop.right, bottom)));
        let fixedBottom = bottom;
        for (let imageLine of imageLines) {
            if (MathUtils.hasIntersection(imageLine, bottomLine)) {
                let result = this.tryToFindFixedSide(adjacentLines, imageLine, bottom, false, false);
                fixedBottom = Math.min(fixedBottom, result);
            }
        }
        return fixedBottom;
    }

    private tryToFindFixedSide(adjacentLines: Array<LineSegment>, imageLine: LineSegment,
                               side: number, isCompareX: boolean, isCompareMax: boolean): number {
        let fixedSide = side;
        let compareFunc = isCompareMax ? Math.max : Math.min;
        for (let adjacentLine of adjacentLines) {
            if (MathUtils.hasIntersection(imageLine, adjacentLine)) {
                let intersection = MathUtils.getIntersection(imageLine, adjacentLine);
                if (intersection == undefined) {
                    continue;
                }
                let compare = isCompareX ? intersection.x : intersection.y;
                fixedSide = compareFunc(side, compare);
            }
        }
        return fixedSide;
    }

    endCropRectMove() {
        this.isLeft = false;
        this.isRight = false;
        this.isTop = false;
        this.isBottom = false;
        this.isHorizontalSide = false;
        this.isVerticalSide = false;
    }
}