PVector add mult normalize mag PVector souri = new PVector (mouseX, mouseY); PVector centr = new PVector (width / 2 , height / 2 ); souri . sub(centr); souri . mult( 0.3 ); line( 0 , 0 , souri . x, souri . y); Mover void update () { PVector mo

ClassIn 退出专注学习模式的小工具