ngx-document-scanner
Version:
Angular 2+ component for cropping and enhancing images of documents
192 lines • 21.4 kB
JavaScript
import { __decorate, __metadata } from "tslib";
import { Component, Input } from '@angular/core';
import { LimitsService, PointPositionChange, PositionChangeData } from '../../services/limits.service';
let NgxDraggablePointComponent = class NgxDraggablePointComponent {
constructor(limitsService) {
this.limitsService = limitsService;
this.width = 10;
this.height = 10;
this.color = '#3cabe2';
this.shape = 'rect';
this.pointOptions = 'rect';
this.position = {
x: 0,
y: 0
};
}
ngAfterViewInit() {
Object.keys(this.pointOptions).forEach(key => {
this[key] = this.pointOptions[key];
});
// subscribe to pane dimensions changes
this.limitsService.paneDimensions.subscribe(dimensions => {
if (dimensions.width > 0 && dimensions.width > 0) {
this._paneDimensions = {
width: dimensions.width,
height: dimensions.height
};
this.position = this.getInitialPosition(dimensions);
this.limitsService.positionChange(new PositionChangeData(this.position, this.limitRoles));
}
});
// subscribe to external reposition events
this.limitsService.repositionEvent.subscribe(positions => {
if (positions.length > 0) {
this.externalReposition(positions);
}
});
}
/**
* returns a css style object for the point
*/
pointStyle() {
return {
width: this.width + 'px',
height: this.height + 'px',
'background-color': this.color,
'border-radius': this.shape === 'circle' ? '100%' : 0,
position: 'absolute'
};
}
/**
* registers a position change on the limits service, and adjusts position if necessary
* @param position - the current position of the point
*/
positionChange(position) {
const positionChangeData = new PositionChangeData(position, this.limitRoles);
const limitException = this.limitsService.exceedsLimit(positionChangeData);
if (limitException.exceeds) {
// if exceeds limits, reposition
this.resetPosition = limitException.resetCoordinates;
}
else {
this.limitsService.positionChange(positionChangeData);
this._currentPosition = position;
}
}
/**
* adjusts the position of the point after a limit exception
*/
adjustPosition(limitException) {
const newPosition = {
x: 0,
y: 0
};
Object.keys(this.startPosition).forEach(axis => {
newPosition[axis] = limitException.resetCoordinates[axis] + limitException.resetCoefficients[axis];
});
this.position = newPosition;
this.limitsService.positionChange(new PositionChangeData(this.position, this.limitRoles));
}
/**
* called on movement end, checks if last position exceeded the limits ad adjusts
*/
movementEnd(position) {
let positionChangeData = new PositionChangeData(position, this.limitRoles);
const limitException = this.limitsService.exceedsLimit(positionChangeData);
if (limitException.exceeds) {
this.resetPosition = limitException.resetCoordinates;
if (limitException.exceeds) {
this.adjustPosition(limitException);
positionChangeData = new PositionChangeData(this.position, this.limitRoles);
this.limitsService.updatePosition(positionChangeData);
}
}
}
/**
* calculates the initial positions of the point by it's roles
* @param dimensions - dimensions of the pane in which the point is located
*/
getInitialPosition(dimensions) {
return {
x: this.limitRoles.includes('left') ? 0 : dimensions.width - this.width / 2,
y: this.limitRoles.includes('top') ? 0 : dimensions.height - this.height / 2
};
}
/**
* repositions the point after an external reposition event
* @param positions - an array of all points on the pane
*/
externalReposition(positions) {
positions.forEach(position => {
if (this.limitsService.compareArray(this.limitRoles, position.roles)) {
position = this.enforcePaneLimits(position);
this.position = {
x: position.x,
y: position.y
};
}
});
}
/**
* returns a new point position if the movement exceeded the pane limit
*/
enforcePaneLimits(position) {
if (this._paneDimensions.width === 0 || this._paneDimensions.height === 0) {
return position;
}
else {
if (position.x > this._paneDimensions.width) {
position.x = this._paneDimensions.width;
}
if (position.x < 0) {
position.x = 1;
}
if (position.y > this._paneDimensions.height) {
position.y = this._paneDimensions.height;
}
if (position.y < 0) {
position.y = 1;
}
}
return position;
}
};
NgxDraggablePointComponent.ctorParameters = () => [
{ type: LimitsService }
];
__decorate([
Input(),
__metadata("design:type", Object)
], NgxDraggablePointComponent.prototype, "width", void 0);
__decorate([
Input(),
__metadata("design:type", Object)
], NgxDraggablePointComponent.prototype, "height", void 0);
__decorate([
Input(),
__metadata("design:type", Object)
], NgxDraggablePointComponent.prototype, "color", void 0);
__decorate([
Input(),
__metadata("design:type", String)
], NgxDraggablePointComponent.prototype, "shape", void 0);
__decorate([
Input(),
__metadata("design:type", String)
], NgxDraggablePointComponent.prototype, "pointOptions", void 0);
__decorate([
Input(),
__metadata("design:type", Array)
], NgxDraggablePointComponent.prototype, "limitRoles", void 0);
__decorate([
Input(),
__metadata("design:type", Object)
], NgxDraggablePointComponent.prototype, "startPosition", void 0);
__decorate([
Input(),
__metadata("design:type", HTMLElement)
], NgxDraggablePointComponent.prototype, "container", void 0);
__decorate([
Input(),
__metadata("design:type", Object)
], NgxDraggablePointComponent.prototype, "_currentPosition", void 0);
NgxDraggablePointComponent = __decorate([
Component({
selector: 'ngx-draggable-point',
template: "<div #point ngDraggable=\"draggable\"\r\n (movingOffset)=\"positionChange($event)\"\r\n [ngStyle]=\"pointStyle()\"\r\n [position]=\"position\"\r\n [bounds]=\"container\"\r\n [inBounds]=\"true\"\r\n (endOffset)=\"movementEnd($event)\"\r\n style=\"z-index: 1000\">\r\n</div>\r\n"
}),
__metadata("design:paramtypes", [LimitsService])
], NgxDraggablePointComponent);
export { NgxDraggablePointComponent };
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{AfterViewInit, Component, Input} from '@angular/core';\r\nimport {LimitsService, PointPositionChange, PositionChangeData} from '../../services/limits.service';\r\nimport {ImageDimensions} from '../../PublicModels';\r\nimport {LimitException, XYPosition} from '../../PrivateModels';\r\n\r\n@Component({\r\n  selector: 'ngx-draggable-point',\r\n  templateUrl: './ngx-draggable-point.component.html',\r\n})\r\nexport class NgxDraggablePointComponent implements AfterViewInit {\r\n  @Input() width = 10;\r\n  @Input() height = 10;\r\n  @Input() color = '#3cabe2';\r\n  @Input() shape: 'rect' | 'circle' = 'rect';\r\n  @Input() pointOptions: 'rect' | 'circle' = 'rect';\r\n  @Input() limitRoles: Array<'left'|'right'|'top'|'bottom'>;\r\n  @Input() startPosition: XYPosition;\r\n  @Input() container: HTMLElement;\r\n  @Input() private _currentPosition: XYPosition;\r\n  position: XYPosition = {\r\n    x: 0,\r\n    y: 0\r\n  };\r\n  private _paneDimensions: ImageDimensions;\r\n  resetPosition: XYPosition;\r\n\r\n  constructor(private limitsService: LimitsService) {}\r\n\r\n  ngAfterViewInit() {\r\n    Object.keys(this.pointOptions).forEach(key => {\r\n      this[key] = this.pointOptions[key];\r\n    });\r\n    // subscribe to pane dimensions changes\r\n    this.limitsService.paneDimensions.subscribe(dimensions => {\r\n      if (dimensions.width > 0 && dimensions.width > 0) {\r\n        this._paneDimensions = {\r\n          width: dimensions.width,\r\n          height: dimensions.height\r\n        };\r\n        this.position = this.getInitialPosition(dimensions);\r\n        this.limitsService.positionChange(new PositionChangeData(this.position, this.limitRoles));\r\n      }\r\n    });\r\n    // subscribe to external reposition events\r\n    this.limitsService.repositionEvent.subscribe(positions => {\r\n      if (positions.length > 0) {\r\n        this.externalReposition(positions);\r\n      }\r\n    });\r\n  }\r\n\r\n  /**\r\n   * returns a css style object for the point\r\n   */\r\n  pointStyle() {\r\n    return {\r\n      width: this.width + 'px',\r\n      height: this.height + 'px',\r\n      'background-color': this.color,\r\n      'border-radius': this.shape === 'circle' ? '100%' : 0,\r\n      position: 'absolute'\r\n    };\r\n  }\r\n\r\n  /**\r\n   * registers a position change on the limits service, and adjusts position if necessary\r\n   * @param position - the current position of the point\r\n   */\r\n  positionChange(position: XYPosition) {\r\n    const positionChangeData = new PositionChangeData(position, this.limitRoles);\r\n    const limitException = this.limitsService.exceedsLimit(positionChangeData);\r\n    if (limitException.exceeds) {\r\n      // if exceeds limits, reposition\r\n      this.resetPosition = limitException.resetCoordinates;\r\n    } else {\r\n      this.limitsService.positionChange(positionChangeData);\r\n      this._currentPosition = position;\r\n    }\r\n  }\r\n\r\n  /**\r\n   * adjusts the position of the point after a limit exception\r\n   */\r\n  private adjustPosition(limitException: LimitException) {\r\n    const newPosition = {\r\n      x: 0,\r\n      y: 0\r\n    };\r\n    Object.keys(this.startPosition).forEach(axis => {\r\n      newPosition[axis] = limitException.resetCoordinates[axis] + limitException.resetCoefficients[axis];\r\n    });\r\n    this.position = newPosition;\r\n    this.limitsService.positionChange(new PositionChangeData(this.position, this.limitRoles));\r\n  }\r\n\r\n  /**\r\n   * called on movement end, checks if last position exceeded the limits ad adjusts\r\n   */\r\n  movementEnd(position: XYPosition) {\r\n    let positionChangeData = new PositionChangeData(position, this.limitRoles);\r\n    const limitException = this.limitsService.exceedsLimit(positionChangeData);\r\n    if (limitException.exceeds) {\r\n      this.resetPosition = limitException.resetCoordinates;\r\n      if (limitException.exceeds) {\r\n        this.adjustPosition(limitException);\r\n        positionChangeData = new PositionChangeData(this.position, this.limitRoles);\r\n        this.limitsService.updatePosition(positionChangeData);\r\n      }\r\n    }\r\n  }\r\n\r\n  /**\r\n   * calculates the initial positions of the point by it's roles\r\n   * @param dimensions - dimensions of the pane in which the point is located\r\n   */\r\n  private getInitialPosition(dimensions: ImageDimensions) {\r\n    return {\r\n      x: this.limitRoles.includes('left') ? 0 : dimensions.width - this.width / 2,\r\n      y: this.limitRoles.includes('top') ? 0 : dimensions.height - this.height / 2\r\n    };\r\n  }\r\n\r\n  /**\r\n   * repositions the point after an external reposition event\r\n   * @param positions - an array of all points on the pane\r\n   */\r\n  private externalReposition(positions: Array<PointPositionChange>) {\r\n    positions.forEach(position => {\r\n      if (this.limitsService.compareArray(this.limitRoles, position.roles)) {\r\n        position = this.enforcePaneLimits(position);\r\n        this.position = {\r\n          x: position.x,\r\n          y: position.y\r\n        };\r\n      }\r\n    });\r\n  }\r\n\r\n  /**\r\n   * returns a new point position if the movement exceeded the pane limit\r\n   */\r\n  private enforcePaneLimits(position: PointPositionChange): PointPositionChange {\r\n    if (this._paneDimensions.width === 0 || this._paneDimensions.height === 0) {\r\n      return position;\r\n    } else {\r\n      if (position.x > this._paneDimensions.width) { position.x = this._paneDimensions.width; }\r\n      if (position.x < 0) { position.x = 1; }\r\n      if (position.y > this._paneDimensions.height) { position.y = this._paneDimensions.height; }\r\n      if (position.y < 0) { position.y = 1; }\r\n    }\r\n    return position;\r\n  }\r\n}\r\n\r\n"]}