Support moving continuous encoders (knobs with infinite bounds)

src/app/Knob.cpp

@@ -21,10 +21,14 @@ void Knob::onDragStart(EventDragStart &e) {
 }
 
 void Knob::onDragMove(EventDragMove &e) {
-	float range = maxValue - minValue;
-	float delta = KNOB_SENSITIVITY * -e.mouseRel.y * speed;
-	if (isfinite(range))
-		delta *= range;
+	float range;
+	if (isfinite(minValue) && isfinite(maxValue)) {
+		range = maxValue - minValue;
+	}
+	else {
+		range = 1.0 - (-1.0);
+	}
+	float delta = KNOB_SENSITIVITY * -e.mouseRel.y * speed * range;
 
 	// Drag slower if Mod is held
 	if (windowIsModPressed())

src/app/SVGKnob.cpp

@@ -28,9 +28,14 @@ void SVGKnob::setSVG(std::shared_ptr<SVG> svg) {
 void SVGKnob::step() {
 	// Re-transform TransformWidget if dirty
 	if (dirty) {
-		float angle = 0.0;
-		if (isfinite(minValue) && isfinite(maxValue))
+		float angle;
+		if (isfinite(minValue) && isfinite(maxValue)) {
 			angle = rescale(value, minValue, maxValue, minAngle, maxAngle);
+		}
+		else {
+			angle = rescale(value, -1.0, 1.0, minAngle, maxAngle);
+			angle = fmodf(angle, 2*M_PI);
+		}
 		tw->identity();
 		// Rotate SVG
 		Vec center = sw->box.getCenter();