Class

• <DRM Interval Axis>

Superclass

• <DRM Axis>

Subclass

• None.

Definition

An instance of this DRM class is a <DRM Axis> instance that specifies an interval for each axis value (tick mark).

The axis_interval_value_array field specifies the array of tick mark values, each of which is an interval. While the intervals are not required to be adjacent in a single <DRM Interval Axis> instance, the intervals may not overlap and they shall be in monotonically ascending or monotonically descending order.

If a boundary point can belong to only one interval (that is, there is a gap on one side of the point), it is considered to lie in that interval. If a boundary point is simultaneously the upper bound of one interval and the lower bound of another, it belongs to the interval of which it is the minimal value.

The value_unit field specifies the unit of measurement of the <DRM Interval Axis> instance, which shall be compatible with the requirements imposed by its axis_type value.

If the specified axis_type does not require a unit of measurement, value_unit shall be set to EUC_UNITLESS.

The value_scale field specifies the scale applicable to value_unit.

If the specified axis_type does not require a scale, value_scale shall be set to ESC_UNI.

Class diagram

Figure 6.142 — DRM_Interval_Axis

Constraints

• General axis constraints
• Publishable object

Example(s)

• Consider a <DRM Interval Axis> instance that specifies wavelength bands in centimetres. Its field values are specified as follows:
  axis_type = EAC_WAVELENGTH
  axis_value_count = 3
  axis_interval_value_array[0] = {FLOAT, EUC_METRE, ESC_CENTI, {GE_LT_INTERVAL, 2,4, 3,75}}
  axis_interval_value_array[1] = {FLOAT, EUC_METRE, ESC_CENTI, {GE_LT_INTERVAL, 3,75, 7,5}}
  axis_interval_value_array[2] = {FLOAT, EUC_METRE, ESC_CENTI, {GE_LT_INTERVAL, 7,5, 15,0}}