From 962ac8186543ea4297b2d9a26abb92915131317b Mon Sep 17 00:00:00 2001
From: Stewart Allen <stewart.allen@gmail.com>
Date: Thu, 4 Mar 2021 14:47:24 -0500
Subject: [PATCH] play with incremental rendering

---
 src/kiri/stack.js  | 10 ++++++++++
 src/kiri/stacks.js | 12 ++++++++++++
 2 files changed, 22 insertions(+)

diff --git a/src/kiri/stack.js b/src/kiri/stack.js
index 206c3509..a510b60c 100644
--- a/src/kiri/stack.js
+++ b/src/kiri/stack.js
@@ -44,6 +44,16 @@
             this.show();
             for (let i=0, s=this.slices, len=s.length; i<len; i++) {
                 s[i].visible = i >= newMin && i <= newMax;
+                if (s[i].visible) this.lastVis = s[i];
+            }
+        }
+
+        setLastFraction(frac = 1) {
+            for (let mesh of this.lastVis.children) {
+                let geo = mesh.geometry;
+                let pos = geo.attributes.position;
+                let len = frac === 1 ? Infinity : Math.round(pos.count * frac);
+                geo.setDrawRange(0, len);
             }
         }
 
diff --git a/src/kiri/stacks.js b/src/kiri/stacks.js
index 24106415..dce39e29 100644
--- a/src/kiri/stacks.js
+++ b/src/kiri/stacks.js
@@ -52,6 +52,10 @@
         return stacks[name];
     }
 
+    function getStacks() {
+        return Object.entries(stacks);
+    }
+
     function getLabels() {
         return Object.keys(DYN);
     }
@@ -139,16 +143,24 @@
         max = newMax;
     }
 
+    function setFraction(frac) {
+        Object.values(stacks).forEach(stack => {
+            stack.obj.setLastFraction(frac);
+        });
+    }
+
     KIRI.stacks = {
         clear,
         create,
         rotate,
         remove,
         getStack,
+        getStacks,
         getRange,
         setRange,
         getLabels,
         setVisible,
+        setFraction,
         setFreeMem
     };