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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
Download Patch File Download Diff File Expand all files Collapse all files

23
OpenNest.Core/CNC/Program.cs
View File

@@ -288,6 +288,10 @@ namespace OpenNest.CNC
private Box BoundingBox(ref Vector pos)
{
// Capture the frame origin at entry. Sub-program Offsets and
// absolute-mode endpoints are relative to this fixed origin.
var frameOrigin = pos;
double minX = 0.0;
double minY = 0.0;
double maxX = 0.0;
@@ -303,7 +307,7 @@ namespace OpenNest.CNC
{
var line = (LinearMove)code;
var pt = Mode == Mode.Absolute ?
line.EndPoint :
frameOrigin + line.EndPoint :
line.EndPoint + pos;
if (pt.X > maxX)
@@ -325,7 +329,7 @@ namespace OpenNest.CNC
{
var line = (RapidMove)code;
var pt = Mode == Mode.Absolute
? line.EndPoint
? frameOrigin + line.EndPoint
: line.EndPoint + pos;
if (pt.X > maxX)
@@ -358,8 +362,8 @@ namespace OpenNest.CNC
}
else
{
endpt = arc.EndPoint;
centerpt = arc.CenterPoint;
endpt = frameOrigin + arc.EndPoint;
centerpt = frameOrigin + arc.CenterPoint;
}
double minX1;
@@ -433,10 +437,13 @@ namespace OpenNest.CNC
case CodeType.SubProgramCall:
{
var subpgm = (SubProgramCall)code;
var subPos = subpgm.Offset.X != 0 || subpgm.Offset.Y != 0
? new Vector(subpgm.Offset.X, subpgm.Offset.Y)
: pos;
var box = subpgm.Program.BoundingBox(ref subPos);
if (subpgm.Program == null)
break;
// Sub-program frame origin in this program's frame
// is frameOrigin + Offset, regardless of current pos.
pos = frameOrigin + subpgm.Offset;
var box = subpgm.Program.BoundingBox(ref pos);
if (box.Left < minX)
minX = box.Left;

62
OpenNest.Core/Converters/ConvertMode.cs
View File

@@ -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;
}
}
}

16
OpenNest.Core/Converters/ConvertProgram.cs
View File

@@ -20,6 +20,9 @@ namespace OpenNest.Converters
private static void AddProgram(Program program, ref Mode mode, ref Vector curpos, ref List<Entity> geometry)
{
// Capture the frame origin at entry. Sub-program Offsets are relative
// to this fixed origin, not to the current tool position.
var frameOrigin = curpos;
mode = program.Mode;
for (int i = 0; i < program.Length; ++i)
@@ -43,20 +46,13 @@ namespace OpenNest.Converters
case CodeType.SubProgramCall:
var subpgm = (SubProgramCall)code;
var savedMode = mode;
var savedPos = curpos;
// Position the sub-program at savedPos + Offset.
// savedPos is the base position ((0,0) here, Part.Location in rendering).
// Offset is the hole center in drawing-local coordinates.
curpos = new Vector(savedPos.X + subpgm.Offset.X, savedPos.Y + subpgm.Offset.Y);
// The sub-program's frame origin in this program's frame is
// frameOrigin + Offset — independent of current tool position.
curpos = new Vector(frameOrigin.X + subpgm.Offset.X, frameOrigin.Y + subpgm.Offset.Y);
AddProgram(subpgm.Program, ref mode, ref curpos, ref geometry);
mode = savedMode;
// Restore curpos: ConvertMode.ToIncremental skips SubProgramCalls
// when computing deltas, so subsequent incremental codes expect
// curpos to be where it was before the call.
curpos = savedPos;
break;
}
}