PositionInterpolator2D node

PositionInterpolator2D {
  SFFloat set_fraction 0
  SFVec2f value_changed 0 0
  MFFloat key []
  MFVec2f keyValue []
}

This interpolator is used to interpolate 2D coordinates (pair of float values).

Note:
Do not mistake with CoordinateInterpolator2D which has its value_changed field typed MFVec2f.
See Interpolators for a detailed explanation on how interpolators work and when to use them.

SFFloat set_fraction 0:
Change this set_fraction field (between 0 to 1) to make the interpolator compute a new value.
Value usually routed from the TimeSensor.fraction_changed field. See Interpolators.

SFVec2f value_changed 0 0:
When a new coordinate is computed form the PositionInterpolator2D, it is sent to the value_changed field.

MFFloat key []:
List of float values between 0 and 1. See Interpolators.

MFVec2f keyValue []:
Contains a coordinate (pair of float values) for each value of the key list.

#VRML V2.0 utf8

Group {
  children [
    DEF ANIM_TIMER TimeSensor {
      isActive TRUE
      cycleInterval 4.0
      loop TRUE
    }

    DEF MY_SHAPE_TRS Transform2D {
      children [
        Shape {
          appearance Appearance {
            material Material2D { emissiveColor 1 0 0 }
          }
          geometry Rectangle { size 20 20 }
        }
      ]
    }

    DEF ANIMATION_PI PositionInterpolator2D {
      key      [0.0,       0.25,     0.5,     0.75,     1.0    ]
      keyValue [-10 -10,   -10 10,   10 10,   10 -10,   -10 -10]
    }

    ROUTE ANIM_TIMER.fraction_changed TO ANIMATION_PI.set_fraction
    ROUTE ANIMATION_PI.value_changed TO MY_SHAPE_TRS.translation
  ]
}