fix retraction between widgets. put retraction in prepare instead of export. inline comments

src/mode/fdm/export.js

@@ -212,9 +212,6 @@
         let angle = -Math.PI / 4;
 
         function moveTo(newpos, rate, comment) {
-            if (comment) {
-                append(";; " + comment);
-            }
             let o = [!rate && !newpos.e ? 'G0' : 'G1'];
             let emit = { x: false, y: false, z: false };
             if (typeof newpos.x === 'number' && newpos.x !== pos.x) {
@@ -254,6 +251,9 @@
                 o.append(" F").append(Math.round(rate));
                 pos.f = rate
             }
+            if (comment) {
+                o.append(` ; ${comment}`);
+            }
             let line = o.join('');
             if (last == line) {
                 // console.log({dup:line});
@@ -325,10 +325,6 @@
                 append(`;; --- layer ${layer} (${subst.height} @ ${subst.z.round(3)}) ---`);
             }
 
-            if (layer > 0 && process.outputLayerRetract) {
-                retract();
-            }
-
             // enable fan at fan layer
             if (gcodeFan && layer === process.outputFanLayer) {
                 appendAllSub(gcodeFan);

src/mode/fdm/prepare.js

@@ -34,14 +34,9 @@
             firstLayerMult = process.firstLayerPrintMult,
             firstLayerBrim = process.firstLayerBrim,
             firstLayerBrimTrig = process.firstLayerBrimTrig,
+            layerRetract = process.outputLayerRetract,
             layerno = 0,
             zoff = 0,
-            meshIndex,
-            lastIndex,
-            closest,
-            mindist,
-            minidx,
-            find,
             layerout = [],
             slices = [],
             print = self.worker.print = KIRI.newPrint(settings, widgets),
@@ -271,7 +266,9 @@
             let rec = track[nozzle];
             if (rec) {
                 track[nozzle] = null;
-                if (layer.last()) layer.last().retract = true;
+                if (layer.last()) {
+                    layer.last().retract = true;
+                }
                 start = print.polyPrintPath(rec.poly.clone().setZ(z), start, layer, {
                     tool: using || nozzle,
                     open: true,
@@ -343,6 +340,8 @@
             return a.z - b.z;
         });
 
+        let lastWidget;
+
         // walk cake layers bottom up
         for (let layer of cake) {
             // track purge blocks generated for each layer
@@ -379,10 +378,11 @@
                 });
                 let { z, slice, offset } = order[0];
                 slice.prep = true;
-                // retract between widgets
+                // retract between widgets or layers (when set)
-                if (layerout.length && minidx !== lastIndex) {
+                if (layerout.length && slice.widget !== lastWidget) {
                     layerout.last().retract = true;
                 }
+                lastWidget = slice.widget;
                 layerout.z = z + slice.height / 2;
                 layerout.height = layerout.height || slice.height;
                 // mark layer as anchor if slice is belt and flag set
@@ -408,7 +408,9 @@
                 layerout.appendAll(tmpout);
                 lastOut = slice;
                 lastExt = lastOut.ext
-                lastIndex = minidx;
+                if (layerRetract) {
+                    layerout.last().retract = true;
+                }
             }
 
             // if a declared extruder isn't used in a layer, use selected
@@ -700,9 +702,7 @@
                 .setLayer(opts.other || 'move', moveOpt, opts.moves !== true)
                 .addPolys(moves, { thin: true, z: opts.z });
             // force level when present
-            if (level.z) {
+            let pz = level.z ? level.z - height : opts.z;
-                opts.z = level.z - height;
-            }
             Object.values(prints).forEach(array => {
                 array.forEach(poly => {
                     if (flat && poly.appearsClosed()) {
@@ -715,10 +715,10 @@
                     .addPolys([ poly ],
                         thin ? { thin, z: opts.z, color: poly.color } :
                         flat ? {
-                            flat, z: opts.z, color: poly.color,
+                            flat, z: pz, color: poly.color,
                             outline: true, offset: array.width, open: poly.open  } :
                         {
-                            offset: array.width, height, z: opts.z,
+                            offset: array.width, height, z: pz,
                             color: { face: poly.color, line: poly.color }
                         })
                 });