🐛 Fix G2/G3 angular motion calculation (MarlinFirmware#22407)

Marlin/src/gcode/motion/G2_G3.cpp

@@ -83,12 +83,13 @@ void plan_arc(
  #endif
 
  // Angle of rotation between position and target from the circle center.
- float angular_travel;
+ float angular_travel, abs_angular_travel;
 
  // Do a full circle if starting and ending positions are "identical"
  if (NEAR(current_position[p_axis], cart[p_axis]) && NEAR(current_position[q_axis], cart[q_axis])) {
  // Preserve direction for circles
  angular_travel = clockwise ? -RADIANS(360) : RADIANS(360);
+ abs_angular_travel = RADIANS(360);
  }
  else {
  // Calculate the angle
@@ -103,8 +104,10 @@ void plan_arc(
  case 2: angular_travel += RADIANS(360); break; // Negative but CCW? Reverse direction.
  }
 
+ abs_angular_travel = ABS(angular_travel);
+
  #ifdef MIN_ARC_SEGMENTS
- min_segments = CEIL(min_segments * ABS(angular_travel) / RADIANS(360));
+ min_segments = CEIL(min_segments * abs_angular_travel / RADIANS(360));
  NOLESS(min_segments, 1U);
  #endif
  }
@@ -117,8 +120,8 @@ void plan_arc(
  #endif
 
  // If circling around...
- if (ENABLED(ARC_P_CIRCLES) && circles) {
- const float total_angular = angular_travel + circles * RADIANS(360), // Total rotation with all circles and remainder
+ if (TERN0(ARC_P_CIRCLES, circles)) {
+ const float total_angular = abs_angular_travel + circles * RADIANS(360), // Total rotation with all circles and remainder
  part_per_circle = RADIANS(360) / total_angular; // Each circle's part of the total
 
  #if HAS_Z_AXIS
@@ -138,8 +141,8 @@ void plan_arc(
  TERN_(HAS_EXTRUDERS, extruder_travel = cart.e - current_position.e);
  }
 
- const float flat_mm = radius * angular_travel,
- mm_of_travel = TERN_(HAS_Z_AXIS, linear_travel ? HYPOT(flat_mm, linear_travel) :) ABS(flat_mm);
+ const float flat_mm = radius * abs_angular_travel,
+ mm_of_travel = TERN_(HAS_Z_AXIS, linear_travel ? HYPOT(flat_mm, linear_travel) :) flat_mm;
  if (mm_of_travel < 0.001f) return;
 
  const feedRate_t scaled_fr_mm_s = MMS_SCALED(feedrate_mm_s);