From 12f5714b37fd178468b6c8138bad922f90f6796e Mon Sep 17 00:00:00 2001
From: mfranz <mfranz>
Date: Wed, 7 Feb 2007 22:13:51 +0000
Subject: [PATCH] add support for x/y/z axes. The built-in function is (still)
 a NOOP, but aircraft can plug a custom function. This function can access all
 internal variables of the ViewManager class. It can set me.{x,y,z}_offset,
 and also add offsets to me.{heading,pitch,roll}_offset. Example:

dynamic_view.register_headshake(func {
        me.x_offset = rand() * 0.02;  # Parkinson effect
});

The advantage of this implementation is that it doesn't break MMB drag
functionality, and that is can be frozen by mouse movements.
---
 Nasal/dynamic_view.nas | 25 ++++++++++++++++++++++++-
 1 file changed, 24 insertions(+), 1 deletion(-)

diff --git a/Nasal/dynamic_view.nas b/Nasal/dynamic_view.nas
index 54bb9de1e..5fbb092b1 100644
--- a/Nasal/dynamic_view.nas
+++ b/Nasal/dynamic_view.nas
@@ -61,7 +61,10 @@ var Input = {
 var ViewAxis = {
 	new : func(prop) {
 		var m = { parents : [ViewAxis] };
-		m.prop = props.globals.getNode(prop, 0);
+		m.prop = props.globals.getNode(prop, 1);
+		if (m.prop.getType() == "NONE") {
+			m.prop.setDoubleValue(0);
+		}
 		m.reset();
 		return m;
 	},
@@ -110,6 +113,10 @@ var ViewManager = {
 		m.pitch_axis = ViewAxis.new("/sim/current-view/goal-pitch-offset-deg");
 		m.roll_axis = ViewAxis.new("/sim/current-view/goal-roll-offset-deg");
 
+		m.x_axis = ViewAxis.new("/sim/current-view/x-offset-m");
+		m.y_axis = ViewAxis.new("/sim/current-view/y-offset-m");
+		m.z_axis = ViewAxis.new("/sim/current-view/z-offset-m");
+
 		# accelerations are converted to G (Earth gravitation is omitted)
 		m.ax = Input.new("/accelerations/pilot/x-accel-fps_sec", 0.03108095, 0, 0.58, 0);
 		m.ay = Input.new("/accelerations/pilot/y-accel-fps_sec", 0.03108095, 0, 0.95);
@@ -167,6 +174,7 @@ var ViewManager = {
 		me.roll = me.rollN.getValue();
 
 		me.calculate();
+		me.headshake();
 
 		var b = me.blendN.getValue();
 		var B = 1 - b;
@@ -177,6 +185,10 @@ var ViewManager = {
 		me.heading_axis.apply(me.heading);
 		me.pitch_axis.apply(me.pitch);
 		me.roll_axis.apply(me.roll);
+
+		me.x_axis.apply(me.x_offset);
+		me.y_axis.apply(me.y_offset);
+		me.z_axis.apply(me.z_offset);
 	},
 	lookat : func(heading = nil, pitch = nil, roll = nil) {
 		if (heading == nil) {
@@ -258,6 +270,13 @@ ViewManager.default_helicopter = func {
 
 
 
+# default headshaking code (NOOP)
+#
+ViewManager.headshake = func {
+	me.x_offset = me.y_offset = me.z_offset = 0;
+}
+
+
 # Update loop for the whole dynamic view manager. It only runs if
 # /sim/view[0]/dynamic/enabled is true.
 #
@@ -285,6 +304,10 @@ var register = func(f) {
 	view_manager.calculate = f;
 }
 
+var register_headshake = func(f) {
+	view_manager.headshake = f;
+}
+
 var reset = func {
 	view_manager.reset();
 }