From 79fd318bea020f88929a88d4718cc18b92815cbe Mon Sep 17 00:00:00 2001
From: Stewart Allen <stewart.allen@gmail.com>
Date: Sun, 5 Sep 2021 20:14:47 -0400
Subject: [PATCH] checkpoint zpress work

---
 src/kiri/slicer.js    | 42 +++++++++++++++++++++++++++++++++++++-----
 src/mode/fdm/slice.js |  2 ++
 2 files changed, 39 insertions(+), 5 deletions(-)

diff --git a/src/kiri/slicer.js b/src/kiri/slicer.js
index e147799e..85c469fc 100644
--- a/src/kiri/slicer.js
+++ b/src/kiri/slicer.js
@@ -25,7 +25,9 @@
         time = UTIL.time,
         tracker = UTIL.pwait,
         newSlice = KIRI.newSlice,
-        newOrderedLine = BASE.newOrderedLine;
+        newOrderedLine = BASE.newOrderedLine,
+        beltfact = Math.cos(Math.PI/4),
+        ibeltfact = 1/beltfact;
 
     /**
      * Convenience method. Gets a Widget's points and calls slice()
@@ -53,19 +55,48 @@
      */
     function slice(points, bounds, options, ondone, onupdate) {
         let useFlats = options.flats,
-            zCut = options.zCut || 0,
+            isBelt = options.isBelt || false,
+            zPress = options.zPress || 0, // compress z values less than zPress (flaten bottom)
+            zCut = options.zCut || 0, // cut bottom off model below bed/belt
             xray = options.xray,
+            zList = {},         // map count of z index points for adaptive slicing
             ox = 0,
             oy = 0;
 
-        if (zCut) {
+        // support moving parts below bed to "cut" them
+        // and/or flatten part bottoms
+        let zpress = 0;
+        let zneg = 0;
+        if (zCut || zPress) {
             for (let p of points) {
                 if (!p._z) {
                     p._z = p.z;
-                    p.z -= zCut;
+                    if (zPress) {
+                        if (isBelt) {
+                            let z = (p.z - p.y);
+                            let zo = z * ibeltfact;
+                            let zb = z * beltfact;
+        if (z < 0) zneg++;
+                            if (zo > 0 && zo < zPress) {
+                                p.y += z;
+                                p.z -= z;
+        zpress++;
+                            }
+                            countZ(zo);
+                        } else {
+                            if (p.z < zPress) p.z = 0;
+                        }
+                    }
+                    if (zCut) {
+                        p.z -= zCut;
+                    }
                 }
             }
         }
+        console.log({zpress, zneg});
+        console.log({
+            zList: Object.entries(zList).sort((a,b) => { return parseFloat(a[0]) - parseFloat(b[0]) })
+        });
 
         let zMin = options.zmin || options.firstHeight || Math.floor(bounds.min.z),
             zMax = options.zmax || Math.ceil(bounds.max.z),
@@ -77,7 +108,7 @@
             zIndexes = [],      // auto-detected z slicing offsets (laser/cam)
             zOrdered = [],      // ordered list of Z indexes
             zThick = [],        // ordered list of Z slice thickness (laser)
-            zList = {},         // map count of z index points for adaptive slicing
+            // zList = {},         // map count of z index points for adaptive slicing
             zFlat = {},         // map area of z index flat areas (cam)
             zLines = {},        // map count of z index lines
             zScale,             // bucket span in z units
@@ -105,6 +136,7 @@
             p1 = points[i++];
             p2 = points[i++];
             p3 = points[i++];
+            // used to calculate buckets
             zSum += (Math.abs(p1.z - p2.z) + Math.abs(p2.z - p3.z) + Math.abs(p3.z - p1.z));
             // laser auto-detect z slice points
             if (zInc === 0 || zIncMin) {
diff --git a/src/mode/fdm/slice.js b/src/mode/fdm/slice.js
index 7402790c..09571a1c 100644
--- a/src/mode/fdm/slice.js
+++ b/src/mode/fdm/slice.js
@@ -179,6 +179,8 @@
         SLICER.sliceWidget(widget, {
             mode: 'FDM',
             zCut: widget.track.zcut || 0,
+            zPress: 1,//0.05,
+            isBelt,
             height: sliceHeight,
             minHeight: sliceMinHeight,
             firstHeight: sliceHeightBase,