From 2cc9f470d37c990d857a14cfddc71e7946c9f52d Mon Sep 17 00:00:00 2001
From: Stewart Allen <stewart.allen@gmail.com>
Date: Tue, 27 Apr 2021 22:34:53 -0400
Subject: [PATCH] add anchor bump to help it peel around the belt end

---
 src/kiri/conf.js      |  1 +
 src/kiri/init.js      |  1 +
 src/mode/fdm/slice.js | 20 +++++++++++++++++++-
 web/kiri/lang/en.js   |  2 ++
 4 files changed, 23 insertions(+), 1 deletion(-)

diff --git a/src/kiri/conf.js b/src/kiri/conf.js
index 0ed1beb7..cb9f0aa6 100644
--- a/src/kiri/conf.js
+++ b/src/kiri/conf.js
@@ -321,6 +321,7 @@
                     firstLayerBrimComb: 0,
                     firstLayerBrimGap: 0,
                     firstLayerBeltLead: 3,
+                    firstLayerBeltBump: 0,
                     firstLayerFanSpeed: 0,
                     outputRaft: false,
                     outputRaftSpacing: 0.2,
diff --git a/src/kiri/init.js b/src/kiri/init.js
index 4dc5f5ae..41fd4a77 100644
--- a/src/kiri/init.js
+++ b/src/kiri/init.js
@@ -1680,6 +1680,7 @@
             firstLayerBrimGap:   UC.newInput(LANG.fl_brgp_s, {title:LANG.fl_brgp_l, convert:UC.toFloat, modes:FDM, show:isBelt}),
             fdmSep:              UC.newBlank({class:"pop-sep", modes:FDM, show:isBelt}),
             firstLayerBeltLead:  UC.newInput(LANG.fl_bled_s, {title:LANG.fl_bled_l, convert:UC.toFloat, modes:FDM, show:isBelt}),
+            firstLayerBeltBump:  UC.newInput(LANG.fl_blmp_s, {title:LANG.fl_blmp_l, convert:UC.toFloat, bound:UC.bound(0, 10), modes:FDM, show:isBelt}),
             fdmSep:              UC.newBlank({class:"pop-sep", modes:FDM, show:isNotBelt}),
             outputBrimCount:     UC.newInput(LANG.fl_skrt_s, {title:LANG.fl_skrt_l, convert:UC.toInt, modes:FDM, show:isNotBelt}),
             outputBrimOffset:    UC.newInput(LANG.fl_skro_s, {title:LANG.fl_skro_l, convert:UC.toFloat, modes:FDM, show:isNotBelt}),
diff --git a/src/mode/fdm/slice.js b/src/mode/fdm/slice.js
index 5cca6a72..3d8d843c 100644
--- a/src/mode/fdm/slice.js
+++ b/src/mode/fdm/slice.js
@@ -357,6 +357,7 @@
                     minx -= brim;
                     maxx += brim;
                 }
+                let adds = [];
                 while (offset && start && offset >= sliceHeight) {
                     let addto = start.down;
                     if (!addto) {
@@ -373,10 +374,27 @@
                     let y = z - smin - (nozzleSize / 2);
                     // let splat = BASE.newPolygon().add(wb.min.x, y, z).add(wb.max.x, y, z).setOpen();
                     let splat = BASE.newPolygon().add(minx, y, z).add(maxx, y, z).setOpen();
-                    addto.addTop(splat).fill_sparse = [ splat ];
+                    let snew = addto.addTop(splat).fill_sparse = [ splat ];
+                    adds.push(snew);
                     start = addto;
                     offset -= sliceHeight;
                 }
+                // add anchor bump
+                let bump = spro.firstLayerBeltBump;
+                if (bump) {
+                    adds = adds.reverse().slice(1, adds.length - 1);
+                    let count = 1;
+                    for (let add of adds) {
+                        let poly = add[0];
+                        let y = count++ * -nozzleSize;
+                        if (-y > bump) {
+                            break;
+                        }
+                        poly.push(poly.last().add({x:0, y, z:0}));
+                        poly.push(poly.first().add({x:0, y, z:0}));
+                        poly.setClosed();
+                    }
+                }
             }
 
             // calculations only relevant when solid layers are used
diff --git a/web/kiri/lang/en.js b/web/kiri/lang/en.js
index 5371bcbf..09ff1ed4 100644
--- a/web/kiri/lang/en.js
+++ b/web/kiri/lang/en.js
@@ -325,6 +325,8 @@ kiri.lang['en-us'] = {
     fl_brgp_l:      ["spacing between brim and part","in millimeters"],
     fl_bled_s:      "part anchor",
     fl_bled_l:      ["belt part anchor","at start of print","in millimeters"],
+    fl_blmp_s:      "anchor bump",
+    fl_blmp_l:      ["add a bump to the start of","an anchor to help it peel","off at the end of the belt","in millimeters"],
 
     // FDM SUPPORT
     sp_menu:        "support",