dist/ngx-document-scanner/bundles/ngx-document-scanner.umd.js
function () {
                /** @type {?} */
                var canvas = this.canvas.nativeElement;
                /** @type {?} */
                var ctx = canvas.getContext('2d');
                ctx.clearRect(0, 0, this.dimensions.width, this.dimensions.height);
            }
function () {
                /** @type {?} */
                var canvas = this.canvas.nativeElement;
                /** @type {?} */
                var ctx = canvas.getContext('2d');
                ctx.clearRect(0, 0, this.dimensions.width, this.dimensions.height);
            }
function ( ) { /** @type {?} */ var canvas = this . canvas . nativeElement ; /** @type {?} */ var ctx = canvas . getContext ( '2d' ) ; ctx . clearRect ( 0 , 0 , this . dimensions . width , this . dimensions . height ) ; }
clears the shape canvas
@private
@return {?}
clears the shape canvas