Code cleanup, fixed compilation error and added button based joystick as default

TWANG32/TWANG32.ino

@@ -32,19 +32,21 @@
 #define VERSION "2018-06-28"
 
 #include <FastLED.h>
-#include<Wire.h>
+#include <Wire.h>
 #include "Arduino.h"
 #include "RunningMedian.h"
 
 // twang files
 #include "config.h"
+#ifdef USE_GYRO_JOYSTICK
 #include "twang_mpu.h"
-#include "enemy.h"
-#include "particle.h"
-#include "spawner.h"
-#include "lava.h"
-#include "boss.h"
-#include "conveyor.h"
+#endif
+#include "Enemy.h"
+#include "Particle.h"
+#include "Spawner.h"
+#include "Lava.h"
+#include "Boss.h"
+#include "Conveyor.h"
 #include "iSin.h"
 #include "sound.h"
 #include "settings.h"
@@ -90,7 +92,9 @@ bool attacking = 0;                // Is the attack in progress?
 #define WIN_CLEAR_DURATION 1000
 #define WIN_OFF_DURATION 1200
 
+#ifdef USE_GYRO_JOYSTICK
 Twang_MPU accelgyro = Twang_MPU();
+#endif
 CRGB leds[VIRTUAL_LED_COUNT];
 RunningMedian MPUAngleSamples = RunningMedian(5);
 RunningMedian MPUWobbleSamples = RunningMedian(5);
@@ -203,7 +207,9 @@ void setup() {
     settings_init();    // load the user settings from EEPROM
 
     Wire.begin();
+#ifdef USE_GYRO_JOYSTICK
     accelgyro.initialize();
+#endif
 
 #ifdef USE_NEOPIXEL
     Serial.print("\r\nCompiled for WS2812B (Neopixel) LEDs");
@@ -223,12 +229,18 @@ void setup() {
 
     sound_init(DAC_AUDIO_PIN);
 
+#ifndef USE_GYRO_JOYSTICK
+    pinMode(upButtonPinNumber, INPUT_PULLUP);
+    pinMode(downButtonPinNumber, INPUT_PULLUP);
+    pinMode(leftButtonPinNumber, INPUT_PULLUP);
+    pinMode(rightButtonPinNumber, INPUT_PULLUP);
+#endif
+
     ap_setup();
 
     stage = STARTUP;
     stageStartTime = millis();
     lives = user_settings.lives_per_level;
-	
 }
 
 void loop() {
@@ -243,8 +255,6 @@ void loop() {
           SFXattacking();
       }else{
           SFXtilt(joystickTilt);
-					
-					
       }
   }else if(stage == DEAD){
       SFXdead();
@@ -349,9 +359,7 @@ void loop() {
             if (stageStartTime+GAMEOVER_FADE_DURATION > mm)
             {
                 tickGameover(mm);
-						}
-						else
-						{
+            } else {
                 FastLED.clear();
                 save_game_stats(false);     // boss not killed
 
@@ -359,16 +367,11 @@ void loop() {
                 stage = STARTUP;
                 stageStartTime = millis();
                 lives = user_settings.lives_per_level;
-						
             }
         }
-
         //FastLED.show();
         FastLEDshowESP32();
-
     }
-
-  
 }
 
 // ---------------------------------
@@ -1144,6 +1147,7 @@ void screenSaverTick(){
 
 }
 
+#ifdef USE_GYRO_JOYSTICK
 // ---------------------------------
 // ----------- JOYSTICK ------------
 // ---------------------------------
@@ -1188,6 +1192,34 @@ void getInput(){
         #endif
 
 }
+#else
+
+void getInput() {
+  // This is responsible for the player movement speed and attacking.
+  // You can replace it with anything you want that passes a -90>+90 value to joystickTilt
+  // and any value to joystickWobble that is greater than ATTACK_THRESHOLD (defined at start)
+  // For example you could use 3 momentary buttons:
+
+  bool up = digitalRead(upButtonPinNumber) == LOW;
+  bool down = digitalRead(downButtonPinNumber) == LOW;
+  bool left = digitalRead(leftButtonPinNumber) == LOW;
+  bool right = digitalRead(rightButtonPinNumber) == LOW;
+
+  joystickTilt = 0;
+  if (up) {
+    joystickTilt = 90 ;
+  } else if (down) {
+    joystickTilt = -90;
+  }
+
+  if (left || right) {
+    joystickWobble = user_settings.attack_threshold;
+  } else {
+    joystickWobble = 0;
+  }
+}
+
+#endif
 
 // ---------------------------------
 // -------------- SFX --------------