.. _auto_curve_digitize:

*CREATE A NEW CURVE BY LINEAR INTERPOLATION TO REACH A MAXIMUM OF NUM_POINTS SPECIFIED BELOW*
=============================================================================================

Resamples an input curve by linear interpolation, producing a new curve with a specified number of equidistant intervals between the first and last point. Optionally supports a mid-point split (equal intervals on both sides of a reference x-value) and RDP (Ramer–Douglas–Peucker) smoothing to reduce noise after resampling. Use this worker to normalise curve resolution before comparing, plotting, or feeding curves into downstream ML or correlation workers.

When to use
-----------

Classification: **process**.

Tagged: ``curve_resampling``, ``digitize``, ``equidistant``, ``interpolation``, ``linear_interpolation``, ``num_points``, ``ramer_douglas_peucker``, ``rdp``.

Inputs
------

.. list-table::
   :header-rows: 1
   :widths: 20 20 20 20 20 20

   * - Label
     - ID
     - Type
     - Default
     - Required
     - Description
   * - Curve 1
     - curve1
     - vector
     - —
     - 
     - Input XY curve (vector) to be resampled; accepts any time-history or force-displacement curve — leave empty only if the curve is supplied by an upstream connection.
   * - Num of Intervals
     - num_points
     - integer
     - 100
     - 
     - Number of equidistant intervals to create between the first and last x-value of the curve (i.e. the resampled curve will have num_points + 1 data points); defaults to 100.
   * - Mid Point
     - mid_point
     - integer
     - 0.0
     - 
     - X-axis reference value at which the interval grid is split, creating an equal number of intervals on each side of that value; set to 0 (default) to disable the mid-point split.
   * - Add RDP Smoothing
     - add_rdp
     - string
     - no
     - 
     - Whether to apply Ramer–Douglas–Peucker (RDP) smoothing to the resampled curve after interpolation; select 'yes' to enable, 'no' (default) to skip.
   * - Rdp Espsilon
     - rdp_espsilon
     - integer
     - 1.0
     - 
     - Epsilon tolerance for the RDP smoothing algorithm — larger values remove more points and produce a coarser curve; only used when Add RDP Smoothing is 'yes'; defaults to 1.0.

Outputs
-------

.. list-table::
   :header-rows: 1
   :widths: 20 20 20 20

   * - Label
     - ID
     - Type
     - Description
   * - curve_digitize_output_1
     - curve_digitize_output_1
     - vector
     - Resampled XY curve (vector) containing the linearly interpolated points at equidistant x-intervals, optionally smoothed via RDP.

Disciplines
-----------

- data.curve.transform
- data.signal_processing

Runnable example
----------------

A runnable example is registered for this worker. Open the example workflow on the d3VIEW canvas: `/api/workflow/example?id=curve_digitize <https://www.d3view.com/api/workflow/example?id=curve_digitize>`_

.. raw:: html

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   Auto-generated from <code>transformation</code> schema. Worker id: <code>curve_digitize</code>. Schema hash: <code>4e88a8273d63</code>. Hand-curated docs in <code>workerexamples/</code> override this page when present.
   </p>