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/**
* @author HypnosNova / https://www.threejs.org.cn/gallery
*/
THREE.SelectionHelper = ( function () {
function SelectionHelper( selectionBox, renderer, cssClassName ) {
this.element = document.createElement( 'div' );
this.element.classList.add( cssClassName );
this.element.style.pointerEvents = 'none';
this.renderer = renderer;
this.startPoint = { x: 0, y: 0 };
this.pointTopLeft = { x: 0, y: 0 };
this.pointBottomRight = { x: 0, y: 0 };
this.isDown = false;
this.renderer.domElement.addEventListener( 'mousedown', function ( event ) {
this.isDown = true;
this.onSelectStart( event );
}.bind( this ), false );
this.renderer.domElement.addEventListener( 'mousemove', function ( event ) {
if ( this.isDown ) {
this.onSelectMove( event );
}
}.bind( this ), false );
this.renderer.domElement.addEventListener( 'mouseup', function ( event ) {
this.isDown = false;
this.onSelectOver( event );
}.bind( this ), false );
}
SelectionHelper.prototype.onSelectStart = function ( event ) {
this.renderer.domElement.parentElement.appendChild( this.element );
this.element.style.left = event.clientX + 'px';
this.element.style.top = event.clientY + 'px';
this.element.style.width = '0px';
this.element.style.height = '0px';
this.startPoint.x = event.clientX;
this.startPoint.y = event.clientY;
};
SelectionHelper.prototype.onSelectMove = function ( event ) {
this.pointBottomRight.x = Math.max( this.startPoint.x, event.clientX );
this.pointBottomRight.y = Math.max( this.startPoint.y, event.clientY );
this.pointTopLeft.x = Math.min( this.startPoint.x, event.clientX );
this.pointTopLeft.y = Math.min( this.startPoint.y, event.clientY );
this.element.style.left = this.pointTopLeft.x + 'px';
this.element.style.top = this.pointTopLeft.y + 'px';
this.element.style.width = ( this.pointBottomRight.x - this.pointTopLeft.x ) + 'px';
this.element.style.height = ( this.pointBottomRight.y - this.pointTopLeft.y ) + 'px';
};
SelectionHelper.prototype.onSelectOver = function () {
this.element.parentElement.removeChild( this.element );
};
return SelectionHelper;
} )();
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