/*
	<behavior jsname="behavior_camerazoom" description="Camera Zoom">
		<property name="ZoomSpeed" type="float" default="0.1" />
		<property name="MaxZoomAngle" type="float" default="72" />
		<property name="MinZoomAngle" type="float" default="10" />
	</behavior>
*/
behavior_camerazoom = function() {
	this.previousTimeMs = null;            // Time of the previous frame, used for deltaTime calculation
	this.elapsedTimeMs = 0;                // Time difference between current and previous frame (deltaTime)
	this.mouseWheelValue = 0;              // Mouse wheel delta value, set in onMouseEvent
	this.currentZoomAngle = 0;             // Current Field of View (FOV) angle of the camera
};
behavior_camerazoom.prototype.onAnimate = function(node, currentTimeMs) {
	this.previousTimeMs = currentTimeMs;
	if (ccbGetSceneNodeProperty(node, "Type") == "camera") {
		this.currentZoomAngle = ccbGetSceneNodeProperty(node, "FieldOfView_Degrees");
		this.onAnimate = function(node, currentTimeMs) {
			this.elapsedTimeMs = currentTimeMs - this.previousTimeMs;
			this.previousTimeMs = currentTimeMs;
			if (this.elapsedTimeMs > 200)
				this.elapsedTimeMs = 200;
			this.currentZoomAngle -= this.mouseWheelValue * this.ZoomSpeed * this.elapsedTimeMs;
			this.currentZoomAngle = Math.min(Math.max(this.currentZoomAngle, this.MinZoomAngle), this.MaxZoomAngle);
			ccbSetSceneNodeProperty(node, "FieldOfView_Degrees", this.currentZoomAngle);
			if (this.mouseWheelValue)
				print("Camera Zoom | FOV: " + this.currentZoomAngle.toFixed(2));
			this.mouseWheelValue = 0;
		}
		print("Camera Zoom behavior initialized.");
	} else {
		print("Camera Zoom error: attached node is not a camera.");
	}
};
behavior_camerazoom.prototype.onMouseEvent = function(mouseEventType, mouseWheelDelta) {
	this.mouseWheelValue = mouseWheelDelta;
};