Added effect marquee, which will scroll a given message through the display.

include/effect_marquee.h

@@ -0,0 +1,18 @@
+#pragma once
+
+#include "prototypes.h"
+#include "functions.h"
+#include "Effect.h"
+
+class MarqueeEffect : public Effect {
+private:
+	Window* window = new Window(0, 0, LED_WIDTH, LED_HEIGHT-6);
+	String _text = String("No text set +++ ");
+	saccum78 _position = (window->width<<8);
+public:
+    boolean supports_window = true;
+    boolean can_be_shown_with_clock();
+    void loop();
+    void apply_option(String key, String value) override;
+};
+

src/effect_marquee.cpp

@@ -0,0 +1,26 @@
+#include "effect_marquee.h"
+#include "fonts.h"
+
+boolean MarqueeEffect::can_be_shown_with_clock() {
+	return true;
+}
+
+void MarqueeEffect::loop() {
+	static int loop_counter = 0;
+	window->clear();
+	CRGB color = CHSV(0, 255, 255);
+	uint16_t width = _text.length() * 6;
+	window->drawSubText(&font5x7, _position, 0, _text, &color);
+	_position-=100;
+	if ((_position>>8) <= -width) { // Font is out of the window
+		_position = 0;
+	}
+	if ((_position>>8) + width < window->width) { // Text isn't filling the window up any more
+		window->drawSubText(&font5x7, _position + (width<<8), 0, _text, &color);
+	}
+	
+}
+
+void MarqueeEffect::apply_option(String key, String value) {
+	if (key.equals("text")) _text = value;
+}

src/effects.cpp

@@ -20,6 +20,7 @@
 #include "effect_dvd.h"
 #include "effect_analogclock.h"
 #include "effect_sines.h"
+#include "effect_marquee.h"
 #include "effect_blur2d.h"
 
 Effect* current_effect;
@@ -57,6 +58,7 @@ Effect* select_effect(uint32_t code) {
 		case 25: case 0x8CA97519 /* analog_clock           */ : return new AnalogClockEffect();
 		case 26: case 0xADB18CC5 /* sines                  */ : return new SinesEffect();
 		case 27: case 0x0407881E /* blur2d                 */ : return new Blur2DEffect();
+		case 28: case 0x935CFA7C /* marquee                */ : return new MarqueeEffect();
 		default                                      : return NULL;
 	};
 }