From 76fabfa7f5192b87dd9fd522f3dc5d1097655bcc Mon Sep 17 00:00:00 2001
From: Stewart Allen <stewart.allen@gmail.com>
Date: Thu, 1 Jan 2026 22:43:35 -0500
Subject: [PATCH] arc notes. rm dead code

---
 src/kiri/core/print.js       |  3 ++-
 src/kiri/mode/cam/prepare.js |  1 +
 src/kiri/mode/fdm/export.js  | 17 ++++++-----------
 3 files changed, 9 insertions(+), 12 deletions(-)

diff --git a/src/kiri/core/print.js b/src/kiri/core/print.js
index 17bdf87e..3b19b106 100644
--- a/src/kiri/core/print.js
+++ b/src/kiri/core/print.js
@@ -212,12 +212,13 @@ class Print {
             let { arc } = point;
             if (arc) {
                 arcInfo = arc;
-                // non-emit arc points get -1 for rendering
                 scope.addOutput(output, point, shellMult, moveSpeed, tool);
+                // arc center is relative to first point
                 arcInfo.center.move({ x: -point.x, y: -point.y, z: 0 });
                 last = point;
                 continue;
             } else if (arcInfo) {
+                // accumulate and pass to last point to calc FDM E value
                 arcDist += last.distTo2D(point);
                 if (--arcInfo.skip === 0) {
                     arcInfo.distance = arcDist;
diff --git a/src/kiri/mode/cam/prepare.js b/src/kiri/mode/cam/prepare.js
index 43a0794e..179108f8 100644
--- a/src/kiri/mode/cam/prepare.js
+++ b/src/kiri/mode/cam/prepare.js
@@ -866,6 +866,7 @@ export async function prepare_one(widget, settings, print, firstPoint, update) {
                     let { arc } = point;
                     skip = arc.skip;
                     type = arc.clockwise ? 2 : 3;
+                    // arc center is relative to first point
                     center = arc.center.clone().move({ x: -point.x, y: -point.y });
                     xfactors.push(xfactors.shift());
                 }
diff --git a/src/kiri/mode/fdm/export.js b/src/kiri/mode/fdm/export.js
index c84fa007..0ebd97ff 100644
--- a/src/kiri/mode/fdm/export.js
+++ b/src/kiri/mode/fdm/export.js
@@ -120,6 +120,7 @@ export function fdm_export(print, online, ondone, ondebug) {
         // lenghts of each filament (by nozzle) consumed
         segments = [];
 
+    // build tool use list for this job
     let tools_used = Object.keys(tools);
     for (let tool of tools_used) {
         subst[`tool_used_${tool}`] = true;
@@ -694,6 +695,7 @@ export function fdm_export(print, online, ondone, ondebug) {
                 continue;
             }
 
+            // distance to last point for accumulation and emit calc
             dist = lastp ? lastp.distTo2D(point) : 0;
 
             // re-engage post-retraction before new extrusion
@@ -705,6 +707,8 @@ export function fdm_export(print, online, ondone, ondebug) {
             if (isBelt) {
                 setTempFanSpeed(out.fan);
             }
+
+            // run fan speed macro when value changes
             if (fanSpeed !== lastFanSpeed) {
                 appendAllSub(gcodeFan);
                 lastFanSpeed = fanSpeed;
@@ -741,10 +745,8 @@ export function fdm_export(print, online, ondone, ondebug) {
             if (dist && speedMMM) {
                 time += (dist / speedMMM) * 60 * timeFactor;
             }
-            // if (isNaN(time)) {
-            //     console.log({ layer, path, dist, speedMMM, timeFactor });
-            //     throw "NaN";
-            // }
+
+            // accumulate distance traveled and update macro var
             distance += dist;
             subst.progress = progress = Math.round((distance / totaldistance) * 100);
 
@@ -773,13 +775,6 @@ export function fdm_export(print, online, ondone, ondebug) {
         subst.remain_time = Math.ceil(print.total_time / 60);
     }
 
-    function emitQrec(rec) {
-        let {e, x, y, dist, emitPerMM, speedMMM} = rec;
-        emitMM = extrudeMM(dist, emitPerMM, e);
-        moveTo({x:x, y:y, e:emitMM}, speedMMM);
-        emitted += emitMM;
-    }
-
     if (inloops) {
         append(`M808`);
     }