@zxing/library
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TypeScript port of ZXing multi-format 1D/2D barcode image processing library.
153 lines (152 loc) • 5.17 kB
JavaScript
/*
* Copyright 2013 ZXing authors
*
* 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.
*/
// package com.google.zxing.pdf417.decoder;
// import com.google.zxing.NotFoundException;
import NotFoundException from '../../NotFoundException';
// import com.google.zxing.ResultPoint;
import ResultPoint from '../../ResultPoint';
/**
* @author Guenther Grau
*/
export default /*final*/ class BoundingBox {
constructor(image, topLeft, bottomLeft, topRight, bottomRight) {
if (image instanceof BoundingBox) {
this.constructor_2(image);
}
else {
this.constructor_1(image, topLeft, bottomLeft, topRight, bottomRight);
}
}
/**
*
* @param image
* @param topLeft
* @param bottomLeft
* @param topRight
* @param bottomRight
*
* @throws NotFoundException
*/
constructor_1(image, topLeft, bottomLeft, topRight, bottomRight) {
const leftUnspecified = topLeft == null || bottomLeft == null;
const rightUnspecified = topRight == null || bottomRight == null;
if (leftUnspecified && rightUnspecified) {
throw new NotFoundException();
}
if (leftUnspecified) {
topLeft = new ResultPoint(0, topRight.getY());
bottomLeft = new ResultPoint(0, bottomRight.getY());
}
else if (rightUnspecified) {
topRight = new ResultPoint(image.getWidth() - 1, topLeft.getY());
bottomRight = new ResultPoint(image.getWidth() - 1, bottomLeft.getY());
}
this.image = image;
this.topLeft = topLeft;
this.bottomLeft = bottomLeft;
this.topRight = topRight;
this.bottomRight = bottomRight;
this.minX = Math.trunc(Math.min(topLeft.getX(), bottomLeft.getX()));
this.maxX = Math.trunc(Math.max(topRight.getX(), bottomRight.getX()));
this.minY = Math.trunc(Math.min(topLeft.getY(), topRight.getY()));
this.maxY = Math.trunc(Math.max(bottomLeft.getY(), bottomRight.getY()));
}
constructor_2(boundingBox) {
this.image = boundingBox.image;
this.topLeft = boundingBox.getTopLeft();
this.bottomLeft = boundingBox.getBottomLeft();
this.topRight = boundingBox.getTopRight();
this.bottomRight = boundingBox.getBottomRight();
this.minX = boundingBox.getMinX();
this.maxX = boundingBox.getMaxX();
this.minY = boundingBox.getMinY();
this.maxY = boundingBox.getMaxY();
}
/**
* @throws NotFoundException
*/
static merge(leftBox, rightBox) {
if (leftBox == null) {
return rightBox;
}
if (rightBox == null) {
return leftBox;
}
return new BoundingBox(leftBox.image, leftBox.topLeft, leftBox.bottomLeft, rightBox.topRight, rightBox.bottomRight);
}
/**
* @throws NotFoundException
*/
addMissingRows(missingStartRows, missingEndRows, isLeft) {
let newTopLeft = this.topLeft;
let newBottomLeft = this.bottomLeft;
let newTopRight = this.topRight;
let newBottomRight = this.bottomRight;
if (missingStartRows > 0) {
let top = isLeft ? this.topLeft : this.topRight;
let newMinY = Math.trunc(top.getY() - missingStartRows);
if (newMinY < 0) {
newMinY = 0;
}
let newTop = new ResultPoint(top.getX(), newMinY);
if (isLeft) {
newTopLeft = newTop;
}
else {
newTopRight = newTop;
}
}
if (missingEndRows > 0) {
let bottom = isLeft ? this.bottomLeft : this.bottomRight;
let newMaxY = Math.trunc(bottom.getY() + missingEndRows);
if (newMaxY >= this.image.getHeight()) {
newMaxY = this.image.getHeight() - 1;
}
let newBottom = new ResultPoint(bottom.getX(), newMaxY);
if (isLeft) {
newBottomLeft = newBottom;
}
else {
newBottomRight = newBottom;
}
}
return new BoundingBox(this.image, newTopLeft, newBottomLeft, newTopRight, newBottomRight);
}
getMinX() {
return this.minX;
}
getMaxX() {
return this.maxX;
}
getMinY() {
return this.minY;
}
getMaxY() {
return this.maxY;
}
getTopLeft() {
return this.topLeft;
}
getTopRight() {
return this.topRight;
}
getBottomLeft() {
return this.bottomLeft;
}
getBottomRight() {
return this.bottomRight;
}
}