do oled library better

src/ESP8266_and_ESP32_OLED_driver_for_SSD1306_displays/src/OLEDDisplay.cpp

@@ -677,6 +677,63 @@ uint16_t OLEDDisplay::drawStringMaxWidth(int16_t xMove, int16_t yMove, uint16_t
   uint16_t firstLineChars = 0;
   uint16_t drawStringResult = 1; // later tested for 0 == error, so initialize to 1
 
+  for (uint16_t i = 0; i < length; i++) {
+    char c = (this->fontTableLookupFunction)(text[i]);
+    if (c == 0)
+      continue;
+    strWidth += pgm_read_byte(fontData + JUMPTABLE_START + (c - firstChar) * JUMPTABLE_BYTES + JUMPTABLE_WIDTH);
+
+    // Always try to break on a space, dash or slash
+    if (text[i] == ' ' || text[i]== '-' || text[i] == '/') {
+      preferredBreakpoint = i + 1;
+      widthAtBreakpoint = strWidth;
+    }
+
+    if (strWidth >= maxLineWidth) {
+      if (preferredBreakpoint == 0) {
+        preferredBreakpoint = i;
+        widthAtBreakpoint = strWidth;
+      }
+      drawStringResult = drawStringInternal(xMove, yMove + (lineNumber++) * lineHeight , &text[lastDrawnPos], preferredBreakpoint - lastDrawnPos, widthAtBreakpoint, true);
+      if (firstLineChars == 0)
+        firstLineChars = preferredBreakpoint;
+      lastDrawnPos = preferredBreakpoint;
+      // It is possible that we did not draw all letters to i so we need
+      // to account for the width of the chars from `i - preferredBreakpoint`
+      // by calculating the width we did not draw yet.
+      strWidth = strWidth - widthAtBreakpoint;
+      preferredBreakpoint = 0;
+      if (drawStringResult == 0) // we are past the display already?
+        break;
+    }
+  }
+
+  // Draw last part if needed
+  if (drawStringResult != 0 && lastDrawnPos < length) {
+    drawStringResult = drawStringInternal(xMove, yMove + (lineNumber++) * lineHeight , &text[lastDrawnPos], length - lastDrawnPos, getStringWidth(&text[lastDrawnPos], length - lastDrawnPos, true), true);
+  }
+
+  if (drawStringResult == 0 || (yMove + lineNumber * lineHeight) >= this->height()) // text did not fit on screen
+    return firstLineChars;
+  return 0; // everything was drawn
+}
+
+uint16_t OLEDDisplay::FDRS_drawStringMaxWidth(int16_t xMove, int16_t yMove, uint16_t maxLineWidth, const String &strUser) {
+  uint16_t firstChar  = pgm_read_byte(fontData + FIRST_CHAR_POS);
+  uint16_t lineHeight = pgm_read_byte(fontData + HEIGHT_POS);
+
+  const char* text = strUser.c_str();
+
+  uint16_t length = strlen(text);
+  uint16_t lastDrawnPos = 0;
+  uint16_t lineNumber = 0;
+  uint16_t strWidth = 0;
+
+  uint16_t preferredBreakpoint = 0;
+  uint16_t widthAtBreakpoint = 0;
+  uint16_t firstLineChars = 0;
+  uint16_t drawStringResult = 1; // later tested for 0 == error, so initialize to 1
+
   for (uint16_t i = 0; i < length; i++) {
     char c = (this->fontTableLookupFunction)(text[i]);
     if (c == 0)

src/ESP8266_and_ESP32_OLED_driver_for_SSD1306_displays/src/OLEDDisplay.h

@@ -254,7 +254,12 @@ class OLEDDisplay : public Stream {
     // returns 0 if everything fits on the screen or the numbers of characters in the
     // first line if not
     uint16_t drawStringMaxWidth(int16_t x, int16_t y, uint16_t maxLineWidth, const String &text);
-
+    
+    
+    // Modified version with closer spacing. Also returns number of lines used.
+  
+    uint16_t FDRS_drawStringMaxWidth(int16_t x, int16_t y, uint16_t maxLineWidth, const String &text);
+    
     // Returns the width of the const char* with the current
     // font settings
     uint16_t getStringWidth(const char* text, uint16_t length, bool utf8 = false);

src/fdrs_gateway_oled.h

@@ -34,7 +34,7 @@ void debug_OLED(String debug_text)
     uint8_t lineNumber = 0;
     for (uint8_t i = 0; i < 5; i++)
     {
-        uint8_t ret = display.drawStringMaxWidth(0, 17 + (lineNumber * 9), 127, debug_buffer[i]);
+        uint8_t ret = display.FDRS_drawStringMaxWidth(0, 17 + (lineNumber * 9), 127, debug_buffer[i]);
         lineNumber = ret + lineNumber;
         if (lineNumber > 5)
             break;