Add FlxSound.scrollFactor, getPosition

Author: Raltyro

source/flixel/sound/FlxSound.hx

@@ -21,6 +21,7 @@ import flixel.math.FlxMath;
 import flixel.math.FlxPoint;
 import flixel.system.FlxAssets.FlxSoundAsset;
 import flixel.tweens.FlxTween;
+import flixel.util.FlxDestroyUtil;
 import flixel.util.FlxSignal;
 import flixel.util.FlxStringUtil;
 import flixel.FlxBasic;
@@ -136,11 +137,18 @@ class FlxSound extends FlxBasic {
 	public var radius:Float;
 
 	/**
-	 * Whether the proximity alters the pan or not
+	 * Whether the proximity alters the pan or not.
 	 * @since raltyMod
 	 */
 	public var proximityPan:Bool;
 
+	/**
+	 * Controls how much this object is affected by camera scrolling. `0` = no movement (e.g. a static sound),
+	 * This is only useful if used with proximity (Initialized once proximity is used).
+	 * @since raltyMod
+	 */
+	public var scrollFactor(default, null):FlxPoint;
+
 	/**
 	 * Stores for how much channels are in the loaded sound.
 	 * @since raltyMod
@@ -302,6 +310,8 @@ class FlxSound extends FlxBasic {
 		_lastTime = null;
 
 		if (destroySound) {
+			scrollFactor = FlxDestroyUtil.put(scrollFactor);
+
 			if (group != null) group.remove(this);
 
 			if (_channel != null) {
@@ -348,15 +358,24 @@ class FlxSound extends FlxBasic {
 
 		_amplitudeUpdate = true;
 
-		// Distance-based volume control (TODO for Ralty: REDO THIS)
+		// Distance-based volume control
 		if (target != null) {
-			var targetPosition = target.getPosition();
-			var radialMultiplier = targetPosition.distanceTo(FlxPoint.weak(x, y)) / radius;
-			targetPosition.put();
-			radialMultiplier = 1 - FlxMath.bound(radialMultiplier, 0, 1);
+			var targetPosition = target.getPosition(), position = getPosition();
+			var camera = camera;
+			if (camera != null) {
+				targetPosition.subtract(camera.scroll.x * target.scrollFactor.x, camera.scroll.y * target.scrollFactor.y);
+				if (scrollFactor != null) position.subtract(camera.scroll.x * scrollFactor.x, camera.scroll.y * scrollFactor.y);
+				else position.subtract(camera.scroll.x, camera.scroll.y);
+			}
+
+			var radialMultiplier = targetPosition.distanceTo(position) / radius;
+
+			// Make it so it affects the 3d position of the source and not just the panning?
+			_volumeAdjust = 1 - FlxMath.bound(radialMultiplier, 0, 1);
+			if (proximityPan) _panAdjust = (position.x - targetPosition.x) / radius;
 
-			_volumeAdjust = radialMultiplier;
-			if (proximityPan) _panAdjust = (x - target.x) / radius;
+			targetPosition.put();
+			position.put();
 		}
 		else
 			_volumeAdjust = 1.0;
@@ -536,27 +555,44 @@ class FlxSound extends FlxBasic {
 	 * @param	Pan			Whether panning should be used in addition to the volume changes.
 	 * @return	This FlxSound instance (nice for chaining stuff together, if you're into that).
 	 */
-	public function proximity(x = 0.0, y = 0.0, ?targetObject:FlxObject, ?radius:Float, pan = true):FlxSound {
+	public function proximity(x = 0.0, y = 0.0, ?targetObject:FlxObject, ?radius:Float, pan = true, ?scrollFactor:FlxPoint):FlxSound {
 		setPosition(x, y);
 		if (targetObject != null) this.target = targetObject;
 		if (radius != null) this.radius = radius;
 		proximityPan = pan;
 
+		if (this.scrollFactor == null) this.scrollFactor = FlxPoint.get(1, 1);
+		if (scrollFactor != null) this.scrollFactor.copyFrom(scrollFactor);
+
 		return this;
 	}
 
 	/**
 	 * Helper function to set the coordinates of this object.
 	 * Sound positioning is used in conjunction with proximity/panning.
 	 *
-	 * @param        x        The new x position
-	 * @param        y        The new y position
+	 * @param  x  The new x position
+	 * @param  y  The new y position
 	 */
-	public inline function setPosition(x = 0.0, y = 0.0):Void {
+	public function setPosition(x = 0.0, y = 0.0):Void {
 		this.x = x;
 		this.y = y;
 	}
 
+	/**
+	 * Returns the world position of this object.
+	 * 
+	 * @param   result  Optional arg for the returning point.
+	 * @return  The world position of this object.
+	 * @since   raltyMod
+	 */
+	public function getPosition(?result:FlxPoint):FlxPoint {
+		if (result == null)
+			result = FlxPoint.get();
+
+		return result.set(x, y);
+	}
+
 	/**
 	 * Call this function to play the sound - also works on paused sounds.
 	 *