From 4c9356ff8414e193d582310ba42e655513b915f5 Mon Sep 17 00:00:00 2001
From: Stewart Allen <stewart.allen@gmail.com>
Date: Tue, 13 Dec 2022 19:55:31 -0500
Subject: [PATCH] fix for mutli-color, multi-extruder with purge tower and
 anchor on belt -- still has a render bug that will be hard to fix because
 render happens before anchor cleanup

---
 src/kiri-mode/fdm/slice.js | 15 ++++++++++-----
 src/kiri-run/worker.js     |  2 ++
 2 files changed, 12 insertions(+), 5 deletions(-)

diff --git a/src/kiri-mode/fdm/slice.js b/src/kiri-mode/fdm/slice.js
index 28ca20c8..553e5276 100644
--- a/src/kiri-mode/fdm/slice.js
+++ b/src/kiri-mode/fdm/slice.js
@@ -63,8 +63,6 @@ FDM.sliceAll = function(settings, onupdate) {
         .sort((a,b) => {
             return a.slices[0].z - b.slices[0].z
         });
-    // ignore first widget
-    widgets.shift();
     // count extruders used
     let ext = [];
     for (let w of widgets) {
@@ -75,10 +73,17 @@ FDM.sliceAll = function(settings, onupdate) {
             }
         }
     }
+    // sort widgets by first slice Z
+    widgets.sort((a,b) => {
+        return a.slices[0].z - b.slices[0].z;
+    });
+    // give first widget a pass since it should have the anchor
+    widgets.shift();
     // remove anchor slices from other widgets (only with multi-material)
-    if (ext.length > 1)
-    for (let w of widgets) {
-        w.slices = w.slices.filter(s => s.index >= 0);
+    if (ext.length > 1) {
+        for (let w of widgets) {
+            w.slices = w.slices.filter(s => s.index >= 0);
+        }
     }
 };
 
diff --git a/src/kiri-run/worker.js b/src/kiri-run/worker.js
index 64fb59bf..8725dc00 100644
--- a/src/kiri-run/worker.js
+++ b/src/kiri-run/worker.js
@@ -55,6 +55,8 @@ self.alert = function(o) {
     console.log(o);
 };
 
+self.uuid = ((Math.random() * Date.now()) | 0).toString(36);
+
 function minhandler(msg) {
     let data = msg.data;
     let seq = data.seq;