Negative numbers and touch functionality

Added the ability to count down (including going negative), and touchscreen input.

apps/counter/counter.js

@@ -6,22 +6,41 @@ function updateScreen() {
   g.clearRect(0, 50, 250, 150);
   g.setFont("Vector",40).setFontAlign(0,0);
   g.drawString(Math.floor(counter), g.getWidth()/2, 100);
+  g.drawString('-', 45, 100);
+  g.drawString('+', 185, 100);
 }
 
 
-// add a count by using BTN1
+// add a count by using BTN1 or BTN5
 setWatch(() => {
   counter += 1;
   updateScreen();
 }, BTN1, {repeat:true});
 
 setWatch(() => {
-  counter = 0;
+  counter += 1;
+  updateScreen();
+}, BTN5, {repeat:true});
+
+// subtract a count by using BTN3 or BTN4
+setWatch(() => {
+  counter -= 1;
+  updateScreen();
+}, BTN4, {repeat:true});
+
+setWatch(() => {
+  counter -= 1;
   updateScreen();
 }, BTN3, {repeat:true});
 
+// reset by using BTN2
+setWatch(() => {
+  counter = 0;
+  updateScreen();
+}, BTN2, {repeat:true});
+
 g.clear(1).setFont("6x8");
-g.drawString('Use BTN1 to increase\nthe counter by one.\nUse BTN3 to reset counter.', 25, 200);
+g.drawString('Tap right or BTN1 to increase\nTap left or BTN3 to decrease\nPress BTN2 to reset.', 25, 200);
 
 Bangle.loadWidgets();
 Bangle.drawWidgets();