Added AnimationEffect::Blinker to quickly create a blinking sprite effect from an image file.

include/effect_animation.h

@@ -11,12 +11,14 @@ private:
     const char* name;
     uint16_t xOffset;
     uint16_t yOffset;
+    unsigned long _last_blink_at;
+    uint16_t _blink_freq;
 public:
-    AnimationEffect(const char* name) : AnimationEffect(name, 0x000000, 0, 0) {}
-    AnimationEffect(const char* name, uint32_t bg_color) : AnimationEffect(name, bg_color, 0, 0) {}
-    AnimationEffect(const char* name, uint32_t bg_color, int x, int y);
+    AnimationEffect(const char* name, uint32_t bg_color=0x000000, int x=0, int y=0);
+    static AnimationEffect* Blinker(const char* name, uint16_t interval, uint32_t color, uint32_t background_color=0x000000);
     ~AnimationEffect();
     AnimationEffect* setFgColor(uint32_t c);
+    AnimationEffect* setBlinkFrequency(uint16_t);
     void loop(uint16_t ms);
     String get_name() override;
 };

src/effect_animation.cpp

@@ -9,6 +9,8 @@ AnimationEffect::AnimationEffect(const char* name, uint32_t bg, int x, int y) {
     this->animation = new Animation(name, window);
     this->animation->setBgColor(bg);
     this->animation->setOffsets(this->xOffset, this->yOffset);
+    
+    _last_blink_at = millis();
 }
 
 AnimationEffect* AnimationEffect::setFgColor(uint32_t c) {
@@ -16,11 +18,23 @@ AnimationEffect* AnimationEffect::setFgColor(uint32_t c) {
 	return this;
 }
 
+AnimationEffect* AnimationEffect::setBlinkFrequency(uint16_t ms) {
+	_blink_freq = ms;
+	return this;
+}
+
 AnimationEffect::~AnimationEffect() {
     delete this->animation;
 }
 
 void AnimationEffect::loop(uint16_t ms) {
+	if (_blink_freq > 0) {
+		unsigned long mil = millis();
+		if (mil < _last_blink_at || _last_blink_at + _blink_freq <= mil) {
+			this->animation->invert();
+			_last_blink_at = mil;
+		}
+	}
     this->animation->drawFrame();
     this->animation->advance();
 }
@@ -30,3 +44,10 @@ String AnimationEffect::get_name() {
 	s += this->name;
 	return s;
 }
+
+AnimationEffect* AnimationEffect::Blinker(const char* name, uint16_t interval, uint32_t color, uint32_t background_color) {
+	AnimationEffect* anim = new AnimationEffect(name, background_color);
+	anim->setFgColor(color);
+	anim->setBlinkFrequency(interval);
+	return anim;
+}

src/effects.cpp

@@ -31,11 +31,11 @@ ClockEffect effect_clock;
 TimerEffect effect_timer;
 
 // We're using 0 instead of false to get a better visual difference between true and false.
-const EffectEntry effects[] = {
+EffectEntry effects[] = {
 	/*  0 */ {"sinematrix3",           true,  [](){ return new Sinematrix3Effect(); }},
 	/*  1 */ {"big_clock",             true,  [](){ return new BigClockEffect(); }},
 	/*  2 */ {"clock",                 0,     [](){ return new ClockEffect(); }},
-	/*  3 */ {"bell",                  0,     [](){ return new BellEffect(); }},
+	/*  3 */ {"bell",                  0,     [](){ return AnimationEffect::Blinker("/bell.pia", 300, 0xFFFF00); }},
 	/*  4 */ {"off",                   0,     [](){ return new StaticEffect(0x000000); }},
 	/*  5 */ {"single_dynamic",        true,  [](){ return new SingleDynamicEffect(); }},
 	/*  6 */ {"multi_dynamic",         true,  [](){ return new MultiDynamicEffect(); }},