From 7841c3d0b636b8423842aa04d07e9cacbf130ae0 Mon Sep 17 00:00:00 2001
From: tildearrow <tildearrow@protonmail.com>
Date: Wed, 23 Nov 2022 04:03:03 -0500
Subject: [PATCH] GUI: natural ctrl-scroll zoom in sample editor!

---
 src/gui/sampleEdit.cpp | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/gui/sampleEdit.cpp b/src/gui/sampleEdit.cpp
index 077732dd..8a6809c5 100644
--- a/src/gui/sampleEdit.cpp
+++ b/src/gui/sampleEdit.cpp
@@ -965,11 +965,18 @@ void FurnaceGUI::drawSampleEdit() {
             double zoomPercent=100.0/sampleZoom;
             if (wheelY>0) {
               for (int i=0; i<wheelY; i++) {
+                double oldArea=round(rectSize.x*100.0/zoomPercent);
                 zoomPercent+=zoomPercent/8.0;
+                double increment=fabs(oldArea-(rectSize.x*100.0/zoomPercent))*((ImGui::GetMousePos().x-rectMin.x)/rectSize.x);
+                samplePos+=increment;
               }
             } else {
               for (int i=0; i<-wheelY; i++) {
+                double oldArea=round(rectSize.x*100.0/zoomPercent);
                 zoomPercent-=zoomPercent/8.0;
+                double increment=fabs(oldArea-(rectSize.x*100.0/zoomPercent))*((ImGui::GetMousePos().x-rectMin.x)/rectSize.x);
+                samplePos-=increment;
+                if (samplePos<0) samplePos=0;
               }
             }
             if (zoomPercent>10000.0) zoomPercent=10000.0;