Adding Example9_Lines. Illustrates correct line functionality

Author: PaulZC

examples/Example9_Lines/Example9_Lines.ino

@@ -0,0 +1,97 @@
+/*
+  SFE_MicroOLED Library Demo
+  Paul Clark @ SparkFun Electronics
+  Original Creation Date: December 10th, 2020
+
+  This sketch uses the MicroOLED library to show all the functionality built into the library -
+  specifically the line function. This example is based on Gist by buckle2000
+  https://gist.github.com/buckle2000/68dad3f24613d37625e9c2f590dd3f52
+
+  Hardware Connections:
+    This example assumes you are using Qwiic. See the SPI examples for
+    a detailed breakdown of connection info.
+
+  This code is beerware; if you see me (or any other SparkFun employee) at the
+  local, and you've found our code helpful, please buy us a round!
+  
+  Distributed as-is; no warranty is given.
+*/
+
+#include <Wire.h>
+#include <SFE_MicroOLED.h> //Click here to get the library: http://librarymanager/All#SparkFun_Micro_OLED
+
+#define PIN_RESET 9
+#define DC_JUMPER 0
+MicroOLED oled(PIN_RESET, DC_JUMPER); // I2C declaration
+
+void setup()
+{
+  delay(100);
+  Wire.begin();
+
+  Serial.begin(115200);
+  Serial.println(F("Micro OLED Example"));
+
+  oled.enableDebugging(); // Uncomment this line to enable debug messages on Serial
+
+  oled.begin();    // Initialize the OLED
+  oled.clear(ALL); // Clear the display's internal memory
+  oled.display();  // Display what's in the buffer (splashscreen)
+
+  int MIDDLE_X = oled.getLCDWidth() / 2; // Find the centre of the display
+  int MIDDLE_Y = oled.getLCDHeight() / 2;
+
+  oled.clear(PAGE);
+  oled.line(MIDDLE_X - 10, MIDDLE_Y - 20, MIDDLE_X + 10, MIDDLE_Y + 20); // Steep x0<x1
+  oled.display();
+  delay(500);
+  
+  oled.clear(PAGE);
+  oled.line(MIDDLE_X - 10, MIDDLE_Y - 10, MIDDLE_X + 10, MIDDLE_Y + 10); // 45-degrees x0<x1
+  oled.display();
+  delay(500);
+  
+  oled.clear(PAGE);
+  oled.line(MIDDLE_X - 10, MIDDLE_Y - 5, MIDDLE_X + 10, MIDDLE_Y + 5); // Shallow x0<x1
+  oled.display();
+  delay(500);
+  
+  oled.clear(PAGE);
+  oled.line(MIDDLE_X - 10, MIDDLE_Y, MIDDLE_X + 10, MIDDLE_Y); // Horizontal x0<x1
+  oled.display();
+  delay(500);
+  
+  oled.clear(PAGE);
+  oled.line(MIDDLE_X, MIDDLE_Y - 10, MIDDLE_X, MIDDLE_Y + 10); // Vertical y0<y1
+  oled.display();
+  delay(500);
+  
+  oled.clear(PAGE);
+  oled.line(MIDDLE_X + 10, MIDDLE_Y - 20, MIDDLE_X - 10, MIDDLE_Y + 20); // Steep x0>x1
+  oled.display();
+  delay(500);
+  
+  oled.clear(PAGE);
+  oled.line(MIDDLE_X + 10, MIDDLE_Y - 10, MIDDLE_X - 10, MIDDLE_Y + 10); // 45-degrees x0>x1
+  oled.display();
+  delay(500);
+  
+  oled.clear(PAGE);
+  oled.line(MIDDLE_X + 10, MIDDLE_Y - 5, MIDDLE_X - 10, MIDDLE_Y + 5); // Shallow x0>x1
+  oled.display();
+  delay(500);
+  
+  oled.clear(PAGE);
+  oled.line(MIDDLE_X + 10, MIDDLE_Y, MIDDLE_X - 10, MIDDLE_Y); // Horizontal x0>x1
+  oled.display();
+  delay(500);
+
+  oled.clear(PAGE);
+  oled.line(MIDDLE_X, MIDDLE_Y + 10, MIDDLE_X, MIDDLE_Y - 10); // Vertical y0>y1
+  oled.display();
+}
+
+void loop()
+{
+  // Nothing to do here...
+}