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import { fabric } from 'fabric';
import Component from '@/interface/component';
import { componentNames } from '@/consts';
/**
* Image Rotation component
* @class Rotation
* @extends {Component}
* @param {Graphics} graphics - Graphics instance
* @ignore
*/
class Rotation extends Component {
constructor(graphics) {
super(componentNames.ROTATION, graphics);
}
/**
* Get current angle
* @returns {Number}
*/
getCurrentAngle() {
return this.getCanvasImage().angle;
}
/**
* Set angle of the image
*
* Do not call "this.setImageProperties" for setting angle directly.
* Before setting angle, The originX,Y of image should be set to center.
* See "http://fabricjs.com/docs/fabric.Object.html#setAngle"
*
* @param {number} angle - Angle value
* @returns {Promise}
*/
setAngle(angle) {
const oldAngle = this.getCurrentAngle() % 360; // The angle is lower than 2*PI(===360 degrees)
angle %= 360;
const canvasImage = this.getCanvasImage();
const oldImageCenter = canvasImage.getCenterPoint();
canvasImage.set({ angle }).setCoords();
this.adjustCanvasDimension();
const newImageCenter = canvasImage.getCenterPoint();
this._rotateForEachObject(oldImageCenter, newImageCenter, angle - oldAngle);
return Promise.resolve(angle);
}
/**
* Rotate for each object
* @param {fabric.Point} oldImageCenter - Image center point before rotation
* @param {fabric.Point} newImageCenter - Image center point after rotation
* @param {number} angleDiff - Image angle difference after rotation
* @private
*/
_rotateForEachObject(oldImageCenter, newImageCenter, angleDiff) {
const canvas = this.getCanvas();
const centerDiff = {
x: oldImageCenter.x - newImageCenter.x,
y: oldImageCenter.y - newImageCenter.y,
};
canvas.forEachObject((obj) => {
const objCenter = obj.getCenterPoint();
const radian = fabric.util.degreesToRadians(angleDiff);
const newObjCenter = fabric.util.rotatePoint(objCenter, oldImageCenter, radian);
obj.set({
left: newObjCenter.x - centerDiff.x,
top: newObjCenter.y - centerDiff.y,
angle: (obj.angle + angleDiff) % 360,
});
obj.setCoords();
});
canvas.renderAll();
}
/**
* Rotate the image
* @param {number} additionalAngle - Additional angle
* @returns {Promise}
*/
rotate(additionalAngle) {
const current = this.getCurrentAngle();
return this.setAngle(current + additionalAngle);
}
}
export default Rotation;
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