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Improve G2/G3 precision

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See https://github.com/MarlinFirmware/Marlin/issues/14745#issuecomment-538781253
This commit is contained in:
Scott Lahteine 2019-10-07 00:03:17 -05:00
parent 211ff67440
commit 56595a4c9c
1 changed files with 1 additions and 1 deletions
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Marlin/src/gcode/motion/G2_G3.cpp
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@ -287,7 +287,7 @@ void GcodeSuite::G2_G3(const bool clockwise) {
const xy_pos_t d = p2 - p1, m = (p1 + p2) * 0.5f; // XY distance and midpoint
const float e = clockwise ^ (r < 0) ? -1 : 1, // clockwise -1/1, counterclockwise 1/-1
len = d.magnitude(), // Total move length
h = SQRT(sq(r) - sq(len * 0.5f)); // Distance to the arc pivot-point
h = SQRT((r - d * 0.5f) * (r + d * 0.5f)); // Distance to the arc pivot-point
const xy_pos_t s = { d.x, -d.y }; // Inverse Slope of the perpendicular bisector
arc_offset = m + s * RECIPROCAL(len) * e * h - p1; // The calculated offset
}