1 files changed, 83 insertions, 0 deletions
diff --git a/libraries/TFT/examples/Esplora/EsploraTFTEtchASketch/EsploraTFTEtchASketch.ino b/libraries/TFT/examples/Esplora/EsploraTFTEtchASketch/EsploraTFTEtchASketch.ino
new file mode 100644
index 0000000..a1430d3
--- /dev/null
+++ b/libraries/TFT/examples/Esplora/EsploraTFTEtchASketch/EsploraTFTEtchASketch.ino
@@ -0,0 +1,83 @@
+/*
+
+ Esplora TFT EtchASketch
+ 
+ This example for the Arduino TFT and Esplora draws 
+ a white line on the screen, based on the position 
+ of the joystick. To clear the screen, shake the 
+ Esplora, using the values from the accelerometer.
+ 
+ This example code is in the public domain.
+ 
+ Created 15 April 2013 by Scott Fitzgerald
+ 
+ http://arduino.cc/en/Tutorial/EsploraTFTEtchASketch
+ 
+ */
+ 
+#include <Esplora.h>
+#include <TFT.h>  // Arduino LCD library
+#include <SPI.h>
+
+// initial position of the cursor
+int xPos = EsploraTFT.width()/2;
+int yPos = EsploraTFT.height()/2;
+
+void setup() {
+  // initialize the display
+  EsploraTFT.begin();
+  
+  // clear the background
+  EsploraTFT.background(0,0,0); 
+}
+
+void loop()
+{
+
+  int xAxis = Esplora.readJoystickX();    // read the X axis
+  int yAxis = Esplora.readJoystickY();    // read the Y axis
+
+  // update the position of the line
+  // depending on the position of the joystick
+  if (xAxis<10 && xAxis>-10){
+    xPos=xPos;
+  }
+  else{
+    xPos = xPos + (map(xAxis, -512, 512, 2, -2));
+  }
+  if (yAxis<10 && yAxis>-10){
+    yAxis=yAxis;
+  }
+  else{
+    yPos = yPos + (map(yAxis, -512, 512, -2, 2));
+  }
+
+// don't let the point go past the screen edges
+  if(xPos > 159){
+    (xPos = 159);
+  }
+
+  if(xPos < 0){
+    (xPos = 0);
+  }
+  if(yPos > 127){
+    (yPos = 127);
+  }
+
+  if(yPos < 0){
+    (yPos = 0);
+  }
+  
+  // draw the point
+  EsploraTFT.stroke(255,255,255);
+  EsploraTFT.point(xPos,yPos);
+
+  // check the accelerometer values and clear
+  // the screen if it is being shaken 
+  if(abs(Esplora.readAccelerometer(X_AXIS))>200 || abs(Esplora.readAccelerometer(Y_AXIS))>200){
+    EsploraTFT.background(0,0,0);
+  }
+  
+  delay(33);            
+}
+