@drizm/ng-whiteboard/esm2015/lib/_classes/shape/circle-shape.js

A Canvas component for Angular which supports free drawing.

import { CanvasWhiteboardShape } from './canvas-whiteboard-shape';
import { CanvasWhiteboardPoint } from '../canvas-whiteboard-point.model';
export class CircleShape extends CanvasWhiteboardShape {
    constructor(positionPoint, options, radius) {
        super(positionPoint, options);
        this.radius = radius || 0;
    }
    getShapeName() {
        return 'CircleShape';
    }
    draw(context) {
        context.beginPath();
        context.arc(this.positionPoint.x, this.positionPoint.y, this.radius, 0, Math.PI * 2, false);
        Object.assign(context, this.options);
        context.stroke();
        if (this.options.shouldFillShape) {
            context.fill();
        }
        context.closePath();
    }
    drawPreview(context) {
        this.positionPoint = new CanvasWhiteboardPoint(context.canvas.width / 2, context.canvas.height / 2);
        this.radius = this.calculateRadius(context.canvas.width - 2, context.canvas.height / 2);
        this.draw(context);
    }
    onUpdateReceived(update) {
        this.radius = this.calculateRadius(update.x, update.y);
    }
    calculateRadius(x, y) {
        return Math.sqrt(Math.pow(x - this.positionPoint.x, 2) + Math.pow(y - this.positionPoint.y, 2));
    }
}
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