const { ccclass , property } = cc . _decorator ; @ ccclass export default class Follow_spot extends cc . Component { @ property ( cc . Node ) bg : cc . Node = null ; material : cc . Material = null ; center : number [ ] = [ 0.1 , 0.5 ] ; onLoad ( ) { this . material = this . bg . getComponent ( cc . Sprite ) . getMaterial ( 0 ) ; this . material . setProperty ( 'wh_ratio' , this . bg . width / this . bg . height ) ; this . material . setProperty ( 'center' , this . center ) ; this . bg . on ( cc . Node . EventType . TOUCH_MOVE , this . touchMoveEvent , this ) ; } touchMoveEvent ( evt ) { this . center [ 0 ] += evt . getDeltaX ( ) / this . bg . width ; this . center [ 1 ] -= evt . getDeltaY ( ) / this . bg . height ; this . material . setProperty ( 'center' , this . center ) ; } }