From 5161cca503a89a4de2d8e5021a396e6a4e4e4611 Mon Sep 17 00:00:00 2001
From: Blue Fox <bluefox@privacynerd.de>
Date: Sun, 21 Aug 2022 17:04:44 +0200
Subject: [PATCH] Added display functinality

---
 losungepaper.ino | 128 +++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 123 insertions(+), 5 deletions(-)

diff --git a/losungepaper.ino b/losungepaper.ino
index afe72bb..2238c31 100755
--- a/losungepaper.ino
+++ b/losungepaper.ino
@@ -8,27 +8,141 @@
 Epd epd;
 
 // style of the frame shown
-sFONT TITLE_FONT = Font16;
+sFONT TITLE_FONT = Font20;
 char TITLE_TEXT[] = "Losung heute";
+sFONT TEXT_FONT = Font12;  // for the daily text
+int TEXT_WIDTH = 168;  // width of the box around the text; should be a multiple of the width of the font (eg. Font8 => multiple of 8)
+int TEXT_PADDING_TOP = 40;
+int TEXT_PADDING_BETWEEN_BLOCKS = 20;  // pixels between the lines
+int TEXT_PADDING_BETWEEN_LINES = 1;  // pixels between the lines
+sFONT SOURCE_FONT = Font8;  // for the position in bible
+
+
+String pad(String text, int pad_length, char pad_letter) {
+  if(text.length() >= pad_length) return text;  // if theres nothing to fill, return the text unmodified
+  
+  for(int i = 0; text.length()<pad_length; i++) text += pad_letter;  // fill with pad_letter until the text is as long as padlength specifies
+  return text;
+}
+String pad(String text, int pad_length) { return pad(text, pad_length, ' '); }  // just a fallback for pad_letter
+
+/* Tell how many rows of text will be needed at given font-width and box-width for the text given */
+int getMaxRows(String text, int width, int letter_width) {
+  int lettersPerRow = width / letter_width;
+  float maxRows = float(text.length())/float(lettersPerRow);
+  int maxRowsFloor = text.length()/lettersPerRow;
+  if(maxRows>maxRowsFloor) maxRows = maxRowsFloor+1.0;  // if maxRows is e.g. 5.2, write the next-bigger integer into maxRows
+
+  return maxRows;
+}
+
+/* text_of_row_x tells which row shall be given, 0 for first row */
+String getRow(String text, int width, int letter_width, int text_of_row_x) {  // width should be a multiple of letter_width to fit perfect
+  // calculate needed vars
+  int lettersPerRow = width / letter_width;
+  int maxRows = getMaxRows(text, width, letter_width);
+  text = pad(text, maxRows*lettersPerRow, ' ');
+
+  // some tests
+  if(text_of_row_x > maxRows) return String();
+  if(text_of_row_x < 0) return String();
+
+  return text.substring(lettersPerRow*text_of_row_x, lettersPerRow*(text_of_row_x+1));
+}
+
+// remove special characters (ä,ö,ü,ß)
+String removeSpecialChars(String text) {
+  text.replace("ä", "ae");
+  text.replace("Ä", "AE");
+  text.replace("ö", "oe");
+  text.replace("Ö", "OE");
+  text.replace("ü", "ue");
+  text.replace("Ü", "UE");
+  text.replace("ß", "ss");
+  text.replace("ẞ", "SS");
+
+  return text;
+}
+
+// show the daily text on the epd
+void showDailyText(String losung, String lehrtext, String losungPosition, String lehrtextPosition) {
+  // clean the strings for
+  losung = removeSpecialChars(losung);
+  lehrtext = removeSpecialChars(lehrtext);
+
+  Serial.println(lehrtext);
+
+  // position vars
+  int text_x = 0;
+  int text_y = 0;
 
-void showDailyText() {
   /* This clears the SRAM of the e-paper display and displays it */
   epd.ClearFrame();
   epd.DisplayFrame();
 
   // now the drawing init
   unsigned char image[2048];
-  Paint paint(image, 176, 30);    // width should be the multiple of 8
+  Paint paint(image, 176, TITLE_FONT.Height+2);    // width should be the multiple of 8
   
+  // display title
   paint.Clear(UNCOLORED);
   int startTitleAtX = round((paint.GetWidth()-strlen(TITLE_TEXT)*TITLE_FONT.Width)/2);
   paint.DrawStringAt(startTitleAtX, 2, TITLE_TEXT, &TITLE_FONT, COLORED);
   paint.DrawHorizontalLine(startTitleAtX+15, TITLE_FONT.Height+1, paint.GetWidth()-(startTitleAtX+15)*2, COLORED);
 
-  epd.TransmitPartialData(paint.GetImage(), 0, 0, paint.GetWidth(), paint.GetHeight());
-  epd.RefreshPartial(0, 0, paint.GetWidth(), paint.GetHeight());
+  epd.TransmitPartialData(paint.GetImage(), text_x, text_y, paint.GetWidth(), paint.GetHeight());
+  text_y += TITLE_FONT.Height+2;
+
+  // Losung
+  paint.SetWidth(TEXT_WIDTH);
+  paint.SetHeight(TEXT_FONT.Height);
+  text_y += TEXT_PADDING_TOP;
+
+  for(int row = 0; row<getMaxRows(losung, TEXT_WIDTH, TEXT_FONT.Width); row++) {
+    String text_of_row = getRow(losung, TEXT_WIDTH, TEXT_FONT.Width, row);
+
+    paint.Clear(COLORED);
+    paint.DrawStringAt(0, 0, text_of_row.c_str(), &TEXT_FONT, UNCOLORED);
+    epd.TransmitPartialData(paint.GetImage(), EPD_WIDTH-TEXT_WIDTH, text_y, paint.GetWidth(), paint.GetHeight());
+    text_y += paint.GetHeight();
+    text_y += TEXT_PADDING_BETWEEN_LINES;
+  }
+
+  // Losung bible position
+  paint.SetWidth(losungPosition.length()*SOURCE_FONT.Width);
+  paint.SetHeight(SOURCE_FONT.Height);
+  paint.Clear(UNCOLORED);
+  paint.DrawStringAt(0, 0, losungPosition.c_str(), &SOURCE_FONT, COLORED);
+  epd.TransmitPartialData(paint.GetImage(), EPD_WIDTH-losungPosition.length()*SOURCE_FONT.Width, text_y, paint.GetWidth(), paint.GetHeight());
+
+  // Lehrtext
+  paint.SetWidth(TEXT_WIDTH);  // text block width
+  paint.SetHeight(TEXT_FONT.Height);
+  text_y += TEXT_PADDING_BETWEEN_BLOCKS;  // some space between "losung" block
+
+  for(int row = 0; row<getMaxRows(lehrtext, TEXT_WIDTH, TEXT_FONT.Width); row++) {
+    String text_of_row = getRow(lehrtext, TEXT_WIDTH, TEXT_FONT.Width, row);
+
+    paint.Clear(UNCOLORED);
+    paint.DrawStringAt(0, 0, text_of_row.c_str(), &TEXT_FONT, COLORED);
+    epd.TransmitPartialData(paint.GetImage(), 0, text_y, paint.GetWidth(), paint.GetHeight());
+    text_y += paint.GetHeight();
+    text_y += TEXT_PADDING_BETWEEN_LINES;
+  }
+
+  // Lehrtext bible position
+  paint.SetWidth(lehrtextPosition.length()*SOURCE_FONT.Width);
+  paint.SetHeight(SOURCE_FONT.Height);
+  paint.Clear(COLORED);
+  paint.DrawStringAt(0, 0, lehrtextPosition.c_str(), &SOURCE_FONT, UNCOLORED);
+  epd.TransmitPartialData(paint.GetImage(), 5, text_y, paint.GetWidth(), paint.GetHeight());
+
+
+  // display the whole sent data
+  epd.DisplayFrame();
 }  
 
+
 void setup() {
   // put your setup code here, to run once:
   Serial.begin(115200);
@@ -39,6 +153,10 @@ void setup() {
     return;
   }
   Serial.println("[INFO] Initialized e-Paper!");
+
+  String losung = "Gott spricht: Ich will für Israel wie der Tau sein, dass es blüht wie eine Lilie.";
+  String lehrtext = "Ich bin der Weinstock, ihr seid die Reben. Wer in mir bleibt und ich in ihm, der bringt viel Frucht; denn ohne mich könnt ihr nichts tun.";
+  showDailyText(losung, lehrtext, "Hosea 14,6", "Johannes 15,5");
 }
 
 void loop() {