Marlin_Firmware/Marlin/src/feature/bedlevel/abl/x_twist.cpp

/**
 * Marlin 3D Printer Firmware
 * Copyright (c) 2021 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
 *
 * Based on Sprinter and grbl.
 * Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 *
 */
#include "../../../inc/MarlinConfig.h"

#if ENABLED(X_AXIS_TWIST_COMPENSATION)

#include "../bedlevel.h"

XATC xatc;

float XATC::spacing, XATC::start;
xatc_points_t XATC::z_values;

void XATC::print_points() {
  SERIAL_ECHOLNPGM(" X-Twist Correction:");
  LOOP_L_N(x, XATC_MAX_POINTS) {
    SERIAL_CHAR(' ');
    if (!isnan(z_values[x])) {
      if (z_values[x] >= 0) SERIAL_CHAR('+');
      SERIAL_ECHO_F(z_values[x], 3);
    }
    else {
      LOOP_L_N(i, 6)
        SERIAL_CHAR(i ? '=' : ' ');
    }
  }
  SERIAL_EOL();
}

float lerp(const_float_t t, const_float_t a, const_float_t b) { return a + t * (b - a); }

float XATC::compensation(const xy_pos_t &raw) {
  if (NEAR_ZERO(spacing)) return 0;
  float t = (raw.x - start) / spacing;
  int i = FLOOR(t);
  LIMIT(i, 0, XATC_MAX_POINTS - 2);
  t -= i;
  return lerp(t, z_values[i], z_values[i + 1]);
}

#endif // X_AXIS_TWIST_COMPENSATION