1 files changed, 63 insertions, 0 deletions
diff --git a/libraries/TFT/examples/Esplora/EsploraTFTHorizon/EsploraTFTHorizon.ino b/libraries/TFT/examples/Esplora/EsploraTFTHorizon/EsploraTFTHorizon.ino
new file mode 100644
index 0000000..a7945c9
--- /dev/null
+++ b/libraries/TFT/examples/Esplora/EsploraTFTHorizon/EsploraTFTHorizon.ino
@@ -0,0 +1,63 @@
+/*
+
+ Esplora TFT Horizon
+ 
+ This example for the Arduino TFT and Esplora draws 
+ a line on the screen that stays level with the ground
+ as you tile the Esplora side to side
+ 
+ This example code is in the public domain.
+ 
+ Created 15 April 2013 by Scott Fitzgerald
+ 
+ http://arduino.cc/en/Tutorial/EsploraTFTHorizon
+ 
+ */
+
+#include <Esplora.h>
+#include <TFT.h>            // Arduino LCD library
+#include <SPI.h>
+
+// horizontal start and end positions
+int yStart = EsploraTFT.height()/2;
+int yEnd = EsploraTFT.height()/2;
+
+// previous start and end positions
+int oldEndY;
+int oldStartY;
+
+void setup() {
+  // initialize the display
+  EsploraTFT.begin();
+  // make the background black
+  EsploraTFT.background(0,0,0); 
+}
+
+void loop()
+{
+  // read the x-axis of te accelerometer
+  int tilt = Esplora.readAccelerometer(X_AXIS);
+
+  // the values are 100 when tilted to the left
+  // and  -100 when tilted to the right
+  // map these values to the start and end points
+  yStart = map(tilt,-100,100,EsploraTFT.height(),0);
+  yEnd = map(tilt,-100,100,0,EsploraTFT.height());
+
+  // if the previous values are different than the current values
+  // erase the previous line
+  if (oldStartY != yStart || oldEndY != yEnd) {
+    EsploraTFT.stroke(0,0,0);
+    EsploraTFT.line(0, oldStartY, EsploraTFT.width(), oldEndY);
+  }
+
+  // draw the line in magenta
+  EsploraTFT.stroke(255,0,255);
+  EsploraTFT.line(0,yStart,EsploraTFT.width(),yEnd);
+
+  // save the current start and end points
+  // to compare int he next loop
+  oldStartY= yStart;
+  oldEndY = yEnd;
+  delay(10);            
+}