scrolling text

src/main.cpp

@@ -53,6 +53,7 @@
 #include "BME280.h"
 #include "image.h"
 #include "rotary.h"
+#include "selectionlist.h"
 
 U8G2_SSD1306_128X64_NONAME_F_SW_I2C u8g2(U8G2_R0, /* clock=*/ 15, /* data=*/ 4, /* reset=*/ 16);
 
@@ -66,9 +67,12 @@ char timeStr[20];
 BME280 bme280;
 MP3 mp3;
 Rotary rotary;
+SelectionList menu;
 
 uint32_t lastButtonPress = 0;
 
+u8g2_uint_t titleStr_offset = 0;
+
 //Variables for the sensor and the battery
 static const int buttonPin = 0;
 static const int ResetPin = 17;
@@ -297,16 +301,20 @@ void loop()
     u8g2.setFont(u8g2_font_inb19_mf);
     u8g2.drawStr(0, 20, timeStr);
 
-    char title1[32];   char title2[32];
-    strncpy(title1, titleStr, 22); title1[22] = '\0';
-    strncpy(title2, titleStr+22, 32); title2[31] = '\0';
     char weather[32];
     u8g2.setFont(u8g2_font_profont12_mf); // choose a suitable font
     sprintf(weather, "%.1f°C  %.1f%%  %.0fhPa", bme280.readTemperature(), bme280.readHumidity(), bme280.readPressure());
     u8g2.drawUTF8(0, 30, weather);
     u8g2.setFont(u8g2_font_prospero_bold_nbp_tf); // choose a suitable font
-    u8g2.drawUTF8(0, 54, title1);
-    u8g2.drawUTF8(0, 64, title2);
+
+    u8g2_uint_t width = u8g2.getUTF8Width(titleStr); // calculate the pixel width of the text
+								// repeated drawing of the scrolling text...
+    u8g2.drawUTF8(titleStr_offset, 54, titleStr);			// draw the scolling text
+
+    titleStr_offset-=4;							// scroll by one pixel
+    if ( (u8g2_uint_t)titleStr_offset < (u8g2_uint_t)-width )
+      titleStr_offset = 0; // start over again // u8g2.getDisplayWidth()
+
   } else {
     u8g2.drawXBMP(0,0, IMG_1872_width, IMG_1872_height, IMG_1872_bits);
   }

src/selectionlist.cpp

@@ -0,0 +1,7 @@
+#include "selectionlist.h"
+
+SelectionList::SelectionList() {}
+
+SelectionList::SelectionList(const char* title, uint8_t start_pos, const char* string_list) {}
+
+void SelectionList::draw() {}

src/selectionlist.h

@@ -0,0 +1,27 @@
+#ifndef _SELECTIONLIST_H
+#define _SELECTIONLIST_H
+
+#include <Arduino.h>
+
+class SelectionList {
+  public:
+    SelectionList();
+    SelectionList(const char*, uint8_t, const char*);
+    void draw(void);
+  private:
+    const char* title = "Cloud Types";
+    const char *string_list = 
+      "Altocumulus\n"
+      "Altostratus\n"
+      "Cirrocumulus\n"
+      "Cirrostratus\n"
+      "Cirrus\n"
+      "Cumulonimbus\n"
+      "Cumulus\n"
+      "Nimbostratus\n"
+      "Stratocumulus\n"
+      "Stratus";
+    uint8_t current_selection = 1;
+};
+
+#endif /* _SELECTIONLIST_H */