Add libraries, picocalc notes.

libraries/TFT_eSPI/examples/480 x 320/TFT_String_Align/TFT_String_Align.ino

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+/*
+Tests string alignment
+
+Normally strings are printed relative to the top left corner but this can be
+changed with the setTextDatum() function. The library has #defines for:
+
+TL_DATUM = 0 = Top left
+TC_DATUM = 1 = Top centre
+TR_DATUM = 2 = Top right
+ML_DATUM = 3 = Middle left
+MC_DATUM = 4 = Middle centre
+MR_DATUM = 5 = Middle right
+BL_DATUM = 6 = Bottom left
+BC_DATUM = 7 = Bottom centre
+BR_DATUM = 8 = Bottom right
+
+L_BASELINE =  9 = Left character baseline (Line the 'A' character would sit on)
+C_BASELINE = 10 = Centre character baseline
+R_BASELINE = 11 = Right character baseline
+
+So you can use lines to position text like:
+
+  tft.setTextDatum(BC_DATUM); // Set datum to bottom centre
+ 
+ Needs fonts 2, 4, 6, 7 and 8
+
+  #########################################################################
+  ###### DON'T FORGET TO UPDATE THE User_Setup.h FILE IN THE LIBRARY ######
+  ######        TO SELECT THE FONTS AND PINS YOU USE, SEE ABOVE      ######
+  #########################################################################
+ */
+
+
+#include <SPI.h>
+
+#include <TFT_eSPI.h> // Hardware-specific library
+
+TFT_eSPI tft = TFT_eSPI();       // Invoke custom library
+
+unsigned long drawTime = 0;
+
+int x, y;  // Coordinates for drawing
+
+void setup(void) {
+  Serial.begin(115200);
+  tft.init();
+  tft.setRotation(1);
+}
+
+void loop() {
+
+  tft.fillScreen(TFT_BLACK);
+
+  x = 160, y = 120;
+  
+  //Test all 9 datums 0-8 when plotting numbers
+  for(byte datum = 0; datum < 9; datum++) {
+    tft.setTextColor(TFT_WHITE, TFT_BLACK);
+    
+    tft.setTextDatum(datum);
+    
+    tft.drawNumber(42, x, y, 8);
+    
+    drawCross(x, y, TFT_RED);
+    
+    delay(1000);
+    tft.fillScreen(TFT_BLACK);
+  }
+
+  //Test all 9 datums 0-8 when plotting a string
+  // Datum works when text size is > 1
+  for(byte datum = 0; datum < 9; datum++) {
+    tft.setTextColor(TFT_WHITE, TFT_BLACK);
+    
+    tft.setTextDatum(datum);
+
+    tft.setTextSize(2);
+    
+    tft.drawString("[xox]", x, y, 4);
+    
+    drawCross(x, y, TFT_GREEN);
+    
+    delay(1000);
+    tft.fillScreen(TFT_BLACK);
+  }
+
+  tft.setTextSize(1);
+
+  tft.setTextColor(TFT_BLUE, TFT_BLACK);
+  // Here a special function is used that automatically centres the text
+  // on the x, y coordinate
+  tft.drawCentreString("69", x, y, 8);
+  
+  drawCross(x, y, TFT_CYAN);
+
+  delay(1000);
+  
+  tft.fillScreen(TFT_BLACK);
+  
+  tft.setTextColor(TFT_RED, TFT_BLACK);
+  tft.drawRightString("88",160,120,8);
+  
+  drawCross(x, y, TFT_RED);
+  
+  delay(1000);
+  
+  tft.fillScreen(TFT_BLACK);
+
+  tft.setTextColor(TFT_WHITE, TFT_BLUE);
+
+  //Test floating point drawing function
+
+  tft.setTextDatum(BC_DATUM); // Set datum to bottom centre
+
+  float test = 67.125;
+  y = 180;
+  tft.drawFloat(test, 4, x, y, 4);
+  delay(1000);
+  tft.fillScreen(TFT_BLACK);
+  test = -0.555555;
+  tft.drawFloat(test, 3, x, y, 4);
+  delay(1000);
+  tft.fillScreen(TFT_BLACK);
+  test = 0.1;
+  tft.drawFloat(test, 4, x, y, 4);
+  delay(1000);
+  tft.fillScreen(TFT_BLACK);
+  test = 9999999;
+  tft.drawFloat(test, 1, x, y, 4);
+
+  drawCross(x, y, TFT_RED);
+  
+  delay(4000);
+}
+
+void drawCross(int x, int y, unsigned int color)
+{
+  tft.drawLine(x - 5, y, x + 5, y, color);
+  tft.drawLine(x, y - 5, x, y + 5, color);
+}
+
+
+
+
+