From 9085727425bd7f403abc7bbebd5f91dc482bd748 Mon Sep 17 00:00:00 2001
From: Andrew Belt <andrewpbelt@gmail.com>
Date: Tue, 26 Dec 2017 17:33:00 -0500
Subject: [PATCH] Added support for continuous encoders, aka Knob widgets with
 infinite min/max values

---
 src/app/Knob.cpp    | 6 +++++-
 src/app/SVGKnob.cpp | 4 +++-
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/src/app/Knob.cpp b/src/app/Knob.cpp
index fbb5ee37..f47f3349 100644
--- a/src/app/Knob.cpp
+++ b/src/app/Knob.cpp
@@ -18,7 +18,11 @@ void Knob::onDragStart(EventDragStart &e) {
 
 void Knob::onDragMove(EventDragMove &e) {
 	// Drag slower if Mod
-	float delta = KNOB_SENSITIVITY * (maxValue - minValue) * -e.mouseRel.y * speed;
+	float range = maxValue - minValue;
+	float delta = KNOB_SENSITIVITY * -e.mouseRel.y * speed;
+	if (std::isfinite(range))
+		delta *= range;
+
 	if (guiIsModPressed())
 		delta /= 16.0;
 	dragValue += delta;
diff --git a/src/app/SVGKnob.cpp b/src/app/SVGKnob.cpp
index ae25ddb3..fc96b131 100644
--- a/src/app/SVGKnob.cpp
+++ b/src/app/SVGKnob.cpp
@@ -23,7 +23,9 @@ void SVGKnob::step() {
 	// Re-transform TransformWidget if dirty
 	if (dirty) {
 		tw->box.size = box.size;
-		float angle = rescalef(value, minValue, maxValue, minAngle, maxAngle);
+		float angle = 0.0;
+		if (std::isfinite(minValue) && std::isfinite(maxValue))
+			angle = rescalef(value, minValue, maxValue, minAngle, maxAngle);
 		tw->identity();
 		// Scale SVG to box
 		tw->scale(box.size.div(sw->box.size));