score:-1

function zoom(){
    var t=d3.event.transform;
   if(t.x<=100){
       t.x=100// when t.x <100  make t.x=100
   }else if(t.x>=200){
       t.x=200
   }
    selection.attr("transform",t);//set up your selection`s transform,lock the zoon events 
}

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