add belt anchor line on first layer when needed

src/kiri/init.js

@@ -916,6 +916,7 @@
             API.function.clear();
             API.conf.save();
             showDevices();
+            API.modal.hide();
         };
         UI.deviceAdd.onclick = function() {
             API.function.clear();

src/kiri/print.js

@@ -124,6 +124,7 @@
         let dz = 0,
             abs = true,
             absE = true,
+            belt = false,
             defh = 0,
             height = 0,
             factor = 1,
@@ -216,6 +217,9 @@
                 defh = parseFloat(hd[4]);
                 if (fdm) dz = -defh / 2;
             }
+            if (line.indexOf("BED TYPE: BELT") > 0) {
+                belt = true;
+            }
             line = line.split(";")[0].split(" ").filter(v => v);
             let cmd = line.shift();
             if (!cmd) return;
@@ -270,6 +274,7 @@
         scope.lines = lines.length;
         scope.bytes = gcode.length;
         scope.maxSpeed = Math.floor(maxf / 60);
+        scope.belt = belt;
 
         done({ output: scope.output });
     };

src/mode/fdm/slice.js

@@ -201,7 +201,9 @@
                     ) && !vaseMode;
                 doShells(slice, spro.sliceShells, firstOffset, shellOffset, fillOffset, {
                     vase: vaseMode,
-                    thin: spro.detectThinWalls
+                    thin: spro.detectThinWalls,
+                    belt0: sdev.bedBelt && slice.index === 0,
+                    widget: widget
                 });
                 if (solid) {
                     doSolidLayerFill(slice, fillSpacing, sliceFillAngle);
@@ -358,8 +360,7 @@
      * @param {number} fillOffset
      * @param {Obejct} options
      */
-    function doShells(slice, count, offset1, offsetN, fillOffset, options) {
+    function doShells(slice, count, offset1, offsetN, fillOffset, opt = {}) {
-        const opt = options || {};
         slice.tops.forEach(function(top) {
             let top_poly = [ top.poly ];
 
@@ -464,6 +465,14 @@
 
             // for diffing
             top.last = last;
+
+            if (opt.belt0 && top.shells.length === 0) {
+                let bounds = opt.widget.bounds;
+                top.shells.push(BASE.newPolygon()
+                    .setOpen()
+                    .add(bounds.min.x - 5,0,slice.z)
+                    .add(bounds.max.x + 5,0,slice.z));
+            }
         });
     };