Add filter to map the boolean negation of a flag.

libraries/controllers/src/controllers/impl/Filter.cpp

@@ -22,6 +22,7 @@
 #include "filters/DeadZoneFilter.h"
 #include "filters/HysteresisFilter.h"
 #include "filters/InvertFilter.h"
+#include "filters/NotFilter.h"
 #include "filters/PulseFilter.h"
 #include "filters/ScaleFilter.h"
 #include "filters/TranslateFilter.h"
@@ -40,6 +41,7 @@ REGISTER_FILTER_CLASS_INSTANCE(ConstrainToPositiveIntegerFilter, "constrainToPos
 REGISTER_FILTER_CLASS_INSTANCE(DeadZoneFilter, "deadZone")
 REGISTER_FILTER_CLASS_INSTANCE(HysteresisFilter, "hysteresis")
 REGISTER_FILTER_CLASS_INSTANCE(InvertFilter, "invert")
+REGISTER_FILTER_CLASS_INSTANCE(NotFilter, "not")
 REGISTER_FILTER_CLASS_INSTANCE(ScaleFilter, "scale")
 REGISTER_FILTER_CLASS_INSTANCE(PulseFilter, "pulse")
 REGISTER_FILTER_CLASS_INSTANCE(TranslateFilter, "translate")

libraries/controllers/src/controllers/impl/RouteBuilderProxy.cpp

@@ -24,6 +24,7 @@
 #include "filters/DeadZoneFilter.h"
 #include "filters/HysteresisFilter.h"
 #include "filters/InvertFilter.h"
+#include "filters/NotFilter.h"
 #include "filters/PulseFilter.h"
 #include "filters/ScaleFilter.h"
 #include "filters/TranslateFilter.h"
@@ -148,6 +149,11 @@ QObject* RouteBuilderProxy::pulse(float interval) {
     return this;
 }
 
+QObject* RouteBuilderProxy::not() {
+    addFilter(std::make_shared<NotFilter>());
+    return this;
+}
+
 void RouteBuilderProxy::addFilter(Filter::Pointer filter) {
     _route->filters.push_back(filter);
 }

libraries/controllers/src/controllers/impl/RouteBuilderProxy.h

@@ -53,6 +53,7 @@ class RouteBuilderProxy : public QObject {
         Q_INVOKABLE QObject* postTransform(glm::mat4 transform);
         Q_INVOKABLE QObject* rotate(glm::quat rotation);
         Q_INVOKABLE QObject* lowVelocity(float rotationConstant, float translationConstant);
+        Q_INVOKABLE QObject* not();
 
     private:
         void to(const Endpoint::Pointer& destination);

libraries/controllers/src/controllers/impl/filters/NotFilter.cpp

@@ -0,0 +1,10 @@
+#include "NotFilter.h"
+
+using namespace controller;
+
+NotFilter::NotFilter() {
+}
+
+float NotFilter::apply(float value) const {
+    return (value == 0.0f) ? 1.0f : 0.0f;
+}

libraries/controllers/src/controllers/impl/filters/NotFilter.h

@@ -0,0 +1,21 @@
+#pragma once
+#ifndef hifi_Controllers_Filters_Not_h
+#define hifi_Controllers_Filters_Not_h
+
+#include "../Filter.h"
+
+namespace controller {
+
+class NotFilter : public Filter {
+    REGISTER_FILTER_CLASS(NotFilter);
+public:
+    NotFilter();
+
+    virtual float apply(float value) const override;
+    virtual Pose apply(Pose value) const override { return value; }
+};
+
+}
+
+#endif
+