D3 Transition

• .transition().duration(time) adds a transition to the change
  • time should be a number; its unit is ms
  • these two methods should be between the selection and the change
    • d3.select("svg").select("circle").transition().duration(2000).attr("cx", "400")
  • not all changes can be added with a transition
    • changes in size and position can
    • changes in font family cannot
  • we can add multiple transitions by chaining them
    • then the transitions will happen one by one
    • d3.select("svg").select("circle").transition().duration(2000).attr("cx", "400").transition().duration(2000).attr("cy","200")

Do and Not

Transitions in different statements run simultaneously. Therefore

• DO
  • Run simultaneous transitions on different selections
  • Run sequential transitions on the same selection in one chain
  • Transition from something to something
    • The attributes being transitioned should have an initial value before the transition
• DO NOT
  • Do not run two transitions on the same selection at the same time
    • i.e., in two statements/chains
  • Do not transition from nothing to something
  • Do not store a selection with a transition
    • it is not a selection object anymore
    • it becomes a Transition object
  • Do not put a transition before a merge