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fix: track tool position through sub-programs in ConvertMode

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ConvertMode.ToIncremental skipped SubProgramCall codes entirely when
computing deltas, so parent motions after a sub-call were encoded as if
the tool never moved. Several traversal sites (ConvertProgram,
GraphicsHelper, PlateRenderer, CutDirectionArrows, Program.BoundingBox)
worked around this with save/restore hacks that treated sub-calls as
transparent — but DrawRapids legitimately tracks actual tool position,
so after the last hole the first perimeter rapid was applied to the
wrong base, drifting the rendered perimeter past the plate edge by
roughly the distance to the last hole.

Fix the root cause: ToIncremental and ToAbsolute now walk sub-programs
to compute where they leave the tool, and advance pos accordingly. The
other traversals capture a frameOrigin at entry and compute sub-call
placement as frameOrigin + Offset, letting pos advance naturally
through the sub recursion. All the save/restore workarounds are
removed.

Program.BoundingBox also picks up the same frame-origin treatment,
which corrects a latent bug where absolute-mode endpoints and nested
sub-calls dropped the parent's frame origin.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
This commit is contained in:
AJ Isaacs
2026-04-10 07:51:51 -04:00
parent a6c2235647
commit 572fa06a21
6 changed files with 127 additions and 97 deletions
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62
OpenNest.Core/Converters/ConvertMode.cs
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@@ -1,4 +1,4 @@
using OpenNest.CNC;
using OpenNest.CNC;
using OpenNest.Geometry;
namespace OpenNest.Converters
@@ -9,7 +9,6 @@ namespace OpenNest.Converters
/// Converts the program to absolute coordinates.
/// Does NOT check program mode before converting.
/// </summary>
/// <param name="pgm"></param>
public static void ToAbsolute(Program pgm)
{
var pos = new Vector(0, 0);
@@ -17,21 +16,27 @@ namespace OpenNest.Converters
for (int i = 0; i < pgm.Codes.Count; ++i)
{
var code = pgm.Codes[i];
var motion = code as Motion;
if (motion != null)
if (code is SubProgramCall subCall && subCall.Program != null)
{
motion.Offset(pos);
// Sub-program is placed at Offset in this program's frame.
// After it runs, the tool is at Offset + (sub's end in its own frame).
pos = ComputeEndPosition(subCall.Program, subCall.Offset);
continue;
}
if (code is Motion motion)
{
motion.Offset(pos.X, pos.Y);
pos = motion.EndPoint;
}
}
}
/// <summary>
/// Converts the program to intermental coordinates.
/// Converts the program to incremental coordinates.
/// Does NOT check program mode before converting.
/// </summary>
/// <param name="pgm"></param>
public static void ToIncremental(Program pgm)
{
var pos = new Vector(0, 0);
@@ -39,9 +44,16 @@ namespace OpenNest.Converters
for (int i = 0; i < pgm.Codes.Count; ++i)
{
var code = pgm.Codes[i];
var motion = code as Motion;
if (motion != null)
if (code is SubProgramCall subCall && subCall.Program != null)
{
// Sub-program is placed at Offset in this program's frame,
// regardless of where the tool was before the call.
pos = ComputeEndPosition(subCall.Program, subCall.Offset);
continue;
}
if (code is Motion motion)
{
var pos2 = motion.EndPoint;
motion.Offset(-pos.X, -pos.Y);
@@ -49,5 +61,37 @@ namespace OpenNest.Converters
}
}
}
/// <summary>
/// Computes the tool position after executing <paramref name="pgm"/>,
/// given that the program's frame origin is at <paramref name="startPos"/>
/// in the caller's frame. Walks nested sub-program calls recursively.
/// </summary>
private static Vector ComputeEndPosition(Program pgm, Vector startPos)
{
var pos = startPos;
for (int i = 0; i < pgm.Codes.Count; ++i)
{
var code = pgm.Codes[i];
if (code is SubProgramCall subCall && subCall.Program != null)
{
// Nested sub's frame origin in the caller's frame is startPos + Offset.
pos = ComputeEndPosition(subCall.Program, startPos + subCall.Offset);
continue;
}
if (code is Motion motion)
{
if (pgm.Mode == Mode.Incremental)
pos = pos + motion.EndPoint;
else
pos = startPos + motion.EndPoint;
}
}
return pos;
}
}
}