Add gamepadJoystick.java

app_pojavlauncher/src/main/java/net/kdt/pojavlaunch/customcontrols/gamepad/GamepadJoystick.java

@@ -0,0 +1,93 @@
+package net.kdt.pojavlaunch.customcontrols.gamepad;
+
+import android.view.InputDevice;
+import android.view.MotionEvent;
+
+import com.google.android.material.math.MathUtils;
+
+public class GamepadJoystick {
+
+    //Directions
+    public static final int DIRECTION_NONE = -1; //GamepadJoystick at the center
+    public static final int DIRECTION_NORTH = 0;
+    public static final int DIRECTION_NORTH_EAST = 7;
+    public static final int DIRECTION_EAST = 6;
+    public static final int DIRECTION_SOUTH_EAST = 5;
+    public static final int DIRECTION_SOUTH = 4;
+    public static final int DIRECTION_SOUTH_WEST = 3;
+    public static final int DIRECTION_WEST = 2;
+    public static final int DIRECTION_NORTH_WEST = 1;
+
+    public static final float JOYSTICK_DEADZONE = 0.20f;
+
+    private final int verticalAxis;
+    private final int horizontalAxis;
+
+    public GamepadJoystick(int horizontalAxis, int verticalAxis){
+        this.verticalAxis = verticalAxis;
+        this.horizontalAxis = horizontalAxis;
+    }
+
+    public double getAngleRadian(MotionEvent event){
+        float x = getHorizontalAxis(event);
+        float y = getVerticalAxis(event);
+        if(x == y && x == 0)
+            return 0.00; //atan2 don't like when x and y == 0
+
+        double angle = -Math.atan2(y, x);
+        return angle;
+    }
+
+    public double getAngle(MotionEvent event){
+        float x = getHorizontalAxis(event);
+        float y = getVerticalAxis(event);
+        if(x == y && x == 0)
+            return 0.00; //atan2 don't like when x and y == 0
+
+        return 180+(Math.atan2(x, y)*57);
+    }
+
+    public double getMagnitude(MotionEvent event){
+        float x = Math.abs(event.getAxisValue(horizontalAxis));
+        float y = Math.abs(event.getAxisValue(verticalAxis));
+
+        return MathUtils.dist(0,0, x, y);
+    }
+
+    public float getVerticalAxis(MotionEvent event){
+        return applyDeadzone(event, verticalAxis);
+    }
+
+    public float getHorizontalAxis(MotionEvent event){
+        return applyDeadzone(event, horizontalAxis);
+    }
+
+    private float applyDeadzone(MotionEvent event, int axis){
+        //TODO: tweakable deadzone ?
+        /*
+            This piece of code also modifies the value
+            to make it seem like there was no deadzone in the first place
+         */
+        double magnitude = getMagnitude(event);
+        if (magnitude < JOYSTICK_DEADZONE){
+            return 0;
+        }else{
+            //if( Math.abs(event.getAxisValue(axis)) < 0.035) return 0;
+            return (float) ((event.getAxisValue(axis) / magnitude) * ((magnitude - JOYSTICK_DEADZONE) / (1 - JOYSTICK_DEADZONE)));
+        }
+    }
+
+    public static boolean isJoystickEvent(MotionEvent event){
+        return (event.getSource() & InputDevice.SOURCE_JOYSTICK) == InputDevice.SOURCE_JOYSTICK
+                && event.getAction() == MotionEvent.ACTION_MOVE;
+    }
+
+
+    public int getHeightDirection(MotionEvent event){
+        if(getMagnitude(event) <= JOYSTICK_DEADZONE ) return DIRECTION_NONE;
+        return ((int) ((getAngle(event)+22.5)/45)) % 8;
+    }
+
+
+
+}