Adding horizontal bargraph support with example avri2c sketch

examples/bargraphAvrI2cExample/bargraphAvrI2cExample.ino

@@ -0,0 +1,68 @@
+//Added by jonathanmlang
+#include <Arduino.h>
+#include "SSD1306Ascii.h"
+#include "SSD1306AsciiAvrI2c.h"
+
+// 0X3C+SA0 - 0x3C or 0x3D
+#define I2C_ADDRESS 0x3C
+
+// Define proper RST_PIN if required.
+#define RST_PIN -1
+
+SSD1306AsciiAvrI2c oled;
+//------------------------------------------------------------------------------
+
+byte barLength =118; //total length of bar excluding ends
+byte barVal    =52;  //value of bar
+byte barNotch  =10;  //location of notch in bar
+
+byte barXpos   =5;
+byte barYcol   =5;
+
+void setup() {
+
+#if RST_PIN >= 0
+  oled.begin(&Adafruit128x64, I2C_ADDRESS, RST_PIN);
+#else // RST_PIN >= 0
+  oled.begin(&Adafruit128x64, I2C_ADDRESS);
+  //oled.begin(&ST7567_128x64, I2C_ADDRESS);
+#endif // RST_PIN >= 0
+
+
+
+}
+
+void drawBar(){
+
+  oled.setFont(bargraph);
+
+  oled.setCursor(barXpos-1,barYcol);
+
+  oled.print('b'); //small bar line to close the front of the bar
+
+  for (byte barPos=0; barPos < barLength; barPos++){
+    if (barPos == barNotch){
+      oled.print(barPos<barVal ? 'b' : 'e');    //if the bar position equals barNotch, draw the bar thinner to create a notch.
+    }
+    else{
+      oled.print(barPos<barVal ? 'a' : 'd');    //if the bar position is less than bar value, draw filled line else draw empty line
+    }
+  }
+  oled.print('b'); //small bar line to close the end of the bar
+
+}
+
+//------------------------------------------------------------------------------
+void loop() {
+
+  oled.setFont(System5x7);
+  oled.setCursor(2,1);
+
+  oled.print("Bar value: "); oled.print(barVal); oled.print("   ");
+
+  drawBar();
+
+  barVal<barLength ? barVal++ : barVal=0;
+
+  delay(100);
+}

src/fonts/allFonts.h

@@ -128,6 +128,7 @@ inline uint8_t readFontByte(uint8_t const *addr) { return *addr; }
  */
 #include "cp437font8x8.h"  // fixed Font from 80's IBM PC
 #include "font8x8.h"       // fixed wider font but similar to system5x7 font
+#include "bargraph.h"      // bargraph font
 
 /*
  * These fonts require UTF8 encoding support

src/fonts/bargraph.h

@@ -0,0 +1,21 @@
+// Added by jonathanmlang
+
+#ifndef BARGRAPH_H
+#define BARGRAPH_H
+
+GLCDFONTDECL(bargraph) = {
+    0x0, 0x1, // size of one indicates fixed font width and no pixel padding
+    0x01, // width
+    0x08, // height
+    0x61, // first char  a
+    0x05, // char count 7
+
+0xFE,  // a | //large bar line
+0x7C,  // b l //smaller bar line
+0x00,  // c   // gap
+0x82,  // d : // empty bar
+0x44,  // e thin : //narrow empty bar
+
+};
+
+#endif