ngx-document-scanner
Version:
Angular 2+ component for cropping and enhancing images of documents
115 lines • 13.5 kB
JavaScript
import { __decorate, __metadata } from "tslib";
import { Component, Input, ViewChild } from '@angular/core';
import { LimitsService, PointPositionChange } from '../../services/limits.service';
let NgxShapeOutlineComponent = class NgxShapeOutlineComponent {
constructor(limitsService) {
this.limitsService = limitsService;
this.color = '#3cabe2';
}
ngAfterViewInit() {
// init drawing canvas dimensions
this.canvas.nativeElement.width = this.dimensions.width;
this.canvas.nativeElement.height = this.dimensions.height;
this.limitsService.positions.subscribe(positions => {
if (positions.length === 4) {
this._points = positions;
this.sortPoints();
this.clearCanvas();
this.drawShape();
}
});
// subscribe to changes in the pane's dimensions
this.limitsService.paneDimensions.subscribe(dimensions => {
this.clearCanvas();
this.canvas.nativeElement.width = dimensions.width;
this.canvas.nativeElement.height = dimensions.height;
});
// subscribe to reposition events
this.limitsService.repositionEvent.subscribe(positions => {
if (positions.length === 4) {
setTimeout(() => {
this.clearCanvas();
this.sortPoints();
this.drawShape();
}, 10);
}
});
}
/**
* clears the shape canvas
*/
clearCanvas() {
const canvas = this.canvas.nativeElement;
const ctx = canvas.getContext('2d');
ctx.clearRect(0, 0, this.dimensions.width, this.dimensions.height);
}
/**
* sorts the array of points according to their clockwise alignment
*/
sortPoints() {
const _points = Array.from(this._points);
const sortedPoints = [];
const sortOrder = {
vertical: ['top', 'top', 'bottom', 'bottom'],
horizontal: ['left', 'right', 'right', 'left']
};
for (let i = 0; i < 4; i++) {
const roles = Array.from([sortOrder.vertical[i], sortOrder.horizontal[i]]);
sortedPoints.push(_points.filter((point) => {
return this.limitsService.compareArray(point.roles, roles);
})[0]);
}
this._sortedPoints = sortedPoints;
}
/**
* draws a line between the points according to their order
*/
drawShape() {
const canvas = this.canvas.nativeElement;
const ctx = canvas.getContext('2d');
ctx.lineWidth = this.weight;
ctx.strokeStyle = this.color;
ctx.beginPath();
this._sortedPoints.forEach((point, index) => {
if (index === 0) {
ctx.moveTo(point.x, point.y);
}
if (index !== this._sortedPoints.length - 1) {
const nextPoint = this._sortedPoints[index + 1];
ctx.lineTo(nextPoint.x, nextPoint.y);
}
else {
ctx.closePath();
}
});
ctx.stroke();
}
};
NgxShapeOutlineComponent.ctorParameters = () => [
{ type: LimitsService }
];
__decorate([
Input(),
__metadata("design:type", Object)
], NgxShapeOutlineComponent.prototype, "color", void 0);
__decorate([
Input(),
__metadata("design:type", Number)
], NgxShapeOutlineComponent.prototype, "weight", void 0);
__decorate([
Input(),
__metadata("design:type", Object)
], NgxShapeOutlineComponent.prototype, "dimensions", void 0);
__decorate([
ViewChild('outline'),
__metadata("design:type", Object)
], NgxShapeOutlineComponent.prototype, "canvas", void 0);
NgxShapeOutlineComponent = __decorate([
Component({
selector: 'ngx-shape-outine',
template: "<canvas #outline\r\n style=\"position: absolute; z-index: 1000\"\r\n [ngStyle]=\"{width: dimensions.width + 'px', height: dimensions.height + 'px'}\"\r\n *ngIf=\"dimensions\">\r\n</canvas>\r\n"
}),
__metadata("design:paramtypes", [LimitsService])
], NgxShapeOutlineComponent);
export { NgxShapeOutlineComponent };
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{AfterViewInit, Component, Input, ViewChild} from '@angular/core';\r\nimport {LimitsService, PointPositionChange} from '../../services/limits.service';\r\nimport {ImageDimensions} from '../../PublicModels';\r\n\r\n@Component({\r\n  selector: 'ngx-shape-outine',\r\n  templateUrl: './ngx-shape-outline.component.html',\r\n})\r\nexport class NgxShapeOutlineComponent implements AfterViewInit {\r\n\r\n  @Input() color = '#3cabe2';\r\n  @Input() weight: number;\r\n  @Input() dimensions: ImageDimensions;\r\n  @ViewChild('outline') canvas;\r\n\r\n  private _points: Array<PointPositionChange>;\r\n  private _sortedPoints: Array<PointPositionChange>;\r\n  constructor(private limitsService: LimitsService) {}\r\n\r\n  ngAfterViewInit() {\r\n    // init drawing canvas dimensions\r\n    this.canvas.nativeElement.width = this.dimensions.width;\r\n    this.canvas.nativeElement.height = this.dimensions.height;\r\n    this.limitsService.positions.subscribe(positions => {\r\n      if (positions.length === 4) {\r\n        this._points = positions;\r\n        this.sortPoints();\r\n        this.clearCanvas();\r\n        this.drawShape();\r\n      }\r\n    });\r\n    // subscribe to changes in the pane's dimensions\r\n    this.limitsService.paneDimensions.subscribe(dimensions => {\r\n      this.clearCanvas();\r\n      this.canvas.nativeElement.width = dimensions.width;\r\n      this.canvas.nativeElement.height = dimensions.height;\r\n    });\r\n    // subscribe to reposition events\r\n    this.limitsService.repositionEvent.subscribe( positions => {\r\n      if (positions.length === 4) {\r\n        setTimeout( () => {\r\n          this.clearCanvas();\r\n          this.sortPoints();\r\n          this.drawShape();\r\n        }, 10);\r\n      }\r\n    });\r\n  }\r\n\r\n  /**\r\n   * clears the shape canvas\r\n   */\r\n  private clearCanvas() {\r\n    const canvas = this.canvas.nativeElement;\r\n    const ctx = canvas.getContext('2d');\r\n    ctx.clearRect(0, 0, this.dimensions.width, this.dimensions.height);\r\n  }\r\n\r\n  /**\r\n   * sorts the array of points according to their clockwise alignment\r\n   */\r\n  private sortPoints() {\r\n    const _points = Array.from(this._points);\r\n    const sortedPoints = [];\r\n\r\n    const sortOrder = {\r\n      vertical: ['top', 'top', 'bottom', 'bottom'],\r\n      horizontal: ['left', 'right', 'right', 'left']\r\n    };\r\n\r\n    for (let i = 0; i < 4; i++) {\r\n      const roles = Array.from([sortOrder.vertical[i], sortOrder.horizontal[i]]);\r\n      sortedPoints.push(_points.filter((point) => {\r\n        return this.limitsService.compareArray(point.roles, roles);\r\n      })[0]);\r\n\r\n    }\r\n    this._sortedPoints = sortedPoints;\r\n  }\r\n\r\n  /**\r\n   * draws a line between the points according to their order\r\n   */\r\n  private drawShape() {\r\n    const canvas = this.canvas.nativeElement;\r\n    const ctx = canvas.getContext('2d');\r\n    ctx.lineWidth = this.weight;\r\n    ctx.strokeStyle = this.color;\r\n    ctx.beginPath();\r\n    this._sortedPoints.forEach((point, index) => {\r\n      if (index === 0) {\r\n        ctx.moveTo(point.x, point.y);\r\n      }\r\n      if (index !== this._sortedPoints.length - 1) {\r\n        const nextPoint = this._sortedPoints[index + 1];\r\n        ctx.lineTo(nextPoint.x, nextPoint.y);\r\n      } else {\r\n        ctx.closePath();\r\n      }\r\n    });\r\n    ctx.stroke();\r\n  }\r\n}\r\n\r\n\r\n"]}