Interactive button-pressing demo for shape-shifting without collision-detection

source/main.cpp

@@ -162,17 +162,32 @@ MicroBitImage Block::image() const {
     }
 }
 
+int x = 1;
+
+void a_button_pressed(MicroBitEvent) {
+    x--;
+}
+
+void b_button_pressed(MicroBitEvent) {
+    x++;
+}
 
 void debug_test() {
     // XXX: simple debug test to check my FLASH images were stored correctly
     // for accurately-timed animations irrespective of framerate, track time
     unsigned long stopwatch = UBIT.systemTime();
-    unsigned long move_speed = 350; // move down one block every 350ms
+    unsigned long move_speed = 1000; // move down one block every 350ms
+    // set up event handlers
+    UBIT.messageBus.listen(
+        MICROBIT_ID_BUTTON_A, MICROBIT_BUTTON_EVT_CLICK, a_button_pressed
+    );
+    UBIT.messageBus.listen(
+        MICROBIT_ID_BUTTON_B, MICROBIT_BUTTON_EVT_CLICK, b_button_pressed
+    );
     while (true) {
         // scroll random blocks down the screen
         Block block; // make a new random Block
         // starting positions:
-        int x = 1;
         int y = -3;
         // print image until scrolled down off the screen
         while (y < 6) {
@@ -183,10 +198,10 @@ void debug_test() {
                 unsigned long stopwatch_now = UBIT.systemTime();
                 if ((stopwatch_now - stopwatch) >= move_speed) {
                     y++;
-                }
                     // update the "stopwatch"
                     stopwatch = stopwatch_now;
                 }
+            }
             UBIT.sleep(50); // 50ms sleep for 20 FPS
         }
     }