From 84e5e859191eeca5cf8b58da29b5f369be25c93c Mon Sep 17 00:00:00 2001
From: Mikko Rasa <tdb@tdb.fi>
Date: Fri, 19 Dec 2014 05:04:11 +0200
Subject: [PATCH] Improve SmoothControl range API

Since gestures can generate axis values greater than one, the ability to
disable the upper threshold becomes necessary.
---
 source/input/smoothcontrol.cpp | 35 +++++++++++++++++++++++++++-------
 source/input/smoothcontrol.h   |  6 +++++-
 2 files changed, 33 insertions(+), 8 deletions(-)

diff --git a/source/input/smoothcontrol.cpp b/source/input/smoothcontrol.cpp
index f32e551..6f4f5a4 100644
--- a/source/input/smoothcontrol.cpp
+++ b/source/input/smoothcontrol.cpp
@@ -1,5 +1,8 @@
+#include <stdexcept>
 #include "smoothcontrol.h"
 
+using namespace std;
+
 namespace Msp {
 namespace Input {
 
@@ -33,11 +36,23 @@ SmoothControl::~SmoothControl()
 
 void SmoothControl::set_dead_zone(float d)
 {
+	if(d<0 || (threshold>0 && d>=threshold))
+		throw invalid_argument("SmoothControl::set_dead_zone");
 	dead_zone = d;
 }
 
 void SmoothControl::set_threshold(float t)
 {
+	if(t>=0 && t<=dead_zone)
+		throw invalid_argument("SmoothControl::set_threshold");
+	threshold = t;
+}
+
+void SmoothControl::set_range(float d, float t)
+{
+	if(d<0 || (t>=0 && d>=t))
+		throw invalid_argument("SmoothControl::set_range");
+	dead_zone = d;
 	threshold = t;
 }
 
@@ -72,17 +87,23 @@ void SmoothControl::on_release()
 
 void SmoothControl::on_motion(float v, float r)
 {
-	if(v<-threshold)
-		value = -1;
-	else if(v>threshold)
-		value = 1;
-	else if(v<-dead_zone)
-		value = (v+dead_zone)/(threshold-dead_zone);
+	if(v<-dead_zone)
+		value = v+dead_zone;
 	else if(v>dead_zone)
-		value = (v-dead_zone)/(threshold-dead_zone);
+		value = v-dead_zone;
 	else
 		value = 0;
 
+	if(threshold>=0)
+	{
+		if(v<-threshold)
+			value = -1;
+		else if(v>threshold)
+			value = 1;
+		else
+			value /= threshold-dead_zone;
+	}
+
 	signal_motion.emit(value);
 
 	if(paired_ctrl && (v>0 || (v==0 && paired_ctrl->value!=0)))
diff --git a/source/input/smoothcontrol.h b/source/input/smoothcontrol.h
index 78edbb3..f16177b 100644
--- a/source/input/smoothcontrol.h
+++ b/source/input/smoothcontrol.h
@@ -34,9 +34,13 @@ public:
 	/// Sets the dead zone value.  Any value below this will be treated as 0.
 	void set_dead_zone(float);
 
-	/// Sets the max-out threshold.  Any value above this will be treated as 1.
+	/** Sets the max-out threshold.  Any value above this will be treated as 1.
+	A negative value can be used to disable the threshold entirely. */
 	void set_threshold(float);
 
+	/// Sets dead zone and threshold in a single function call.
+	void set_range(float, float);
+
 	void pair(SmoothControl *ctrl);
 	float get_value() const { return value; }
 
-- 
2.43.0