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view_limiter:

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- new parameter naming (left/right instead of min/max; signs are ignored)
- fix wrap-around skips
- use regular constructor so as not to confuse people  ;-)
This commit is contained in:
mfranz 2008-04-15 13:02:18 +00:00
parent c4ebd9a0f2
commit 7fbeb50695
2 changed files with 43 additions and 29 deletions
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57
Nasal/view.nas
View file

@ -323,42 +323,51 @@ var fly_by_view_handler = {
var pilot_view_limiter = { var pilot_view_limiter = {
new : func {
return { parents: [pilot_view_limiter] };
},
init : func { init : func {
me.hdgN = props.globals.getNode("/sim/current-view/heading-offset-deg"); me.hdgN = props.globals.getNode("/sim/current-view/heading-offset-deg");
me.xoffsetN = props.globals.getNode("/sim/current-view/x-offset-m"); me.xoffsetN = props.globals.getNode("/sim/current-view/x-offset-m");
me.xoffset_lowpass = aircraft.lowpass.new(0.1); me.xoffset_lowpass = aircraft.lowpass.new(0.05);
me.old_offset = 0; me.old_offset = 0;
}, },
start : func { start : func {
var limits = current.getNode("config/limits", 1); var limits = current.getNode("config/limits", 1);
me.heading_min = limits.getNode("heading-min-deg", 1).getValue(); me.left = {
me.heading_max = limits.getNode("heading-max-deg", 1).getValue(); heading_max : abs(limits.getNode("left/heading-max-deg", 1).getValue() or 1000),
me.max_xoffset = limits.getNode("x-offset-max-m", 1).getValue() or 0; xoffset_max : abs(limits.getNode("left/x-offset-max-m", 1).getValue() or 0),
me.threshold_min = limits.getNode("x-offset-heading-min-deg", 1).getValue() or 0; threshold : -abs(limits.getNode("left/x-offset-threshold-deg", 1).getValue() or 0),
me.threshold_max = limits.getNode("x-offset-heading-max-deg", 1).getValue() or 0; };
me.right = {
if (me.heading_max == nil) heading_max : -abs(limits.getNode("right/heading-max-deg", 1).getValue() or 1000),
me.heading_max = 1000; xoffset_max : -abs(limits.getNode("right/x-offset-max-m", 1).getValue() or 0),
if (me.heading_min == nil) threshold : abs(limits.getNode("right/x-offset-threshold-deg", 1).getValue() or 0),
me.heading_min = -1000; };
me.left.range = me.left.threshold - me.left.heading_max;
me.right.range = me.right.threshold - me.right.heading_max;
me.last_hdg = normdeg(me.hdgN.getValue());
me.enable_xoffset = me.right.xoffset_max > 0.001 or me.left.xoffset_max > 0.001;
}, },
update : func { update : func {
var hdg = normdeg(me.hdgN.getValue()); var hdg = normdeg(me.hdgN.getValue());
if (abs(me.last_hdg - hdg) > 180) # avoid wrap-around skips
if (hdg > me.heading_max) me.hdgN.setDoubleValue(hdg = me.last_hdg);
me.hdgN.setDoubleValue(hdg = me.heading_max); elsif (hdg > me.left.heading_max)
elsif (hdg < me.heading_min) me.hdgN.setDoubleValue(hdg = me.left.heading_max);
me.hdgN.setDoubleValue(hdg = me.heading_min); elsif (hdg < me.right.heading_max)
me.hdgN.setDoubleValue(hdg = me.right.heading_max);
me.last_hdg = hdg;
# translate view on X axis to look far right or far left # translate view on X axis to look far right or far left
if (me.max_xoffset > 0.001) { if (me.enable_xoffset) {
var norm = 0; var offset = 0;
if (hdg <= me.threshold_min) if (hdg >= me.left.threshold)
norm = (hdg - me.threshold_min) / (me.heading_min - me.threshold_min); offset = me.left.xoffset_max * (hdg - me.left.threshold) / me.left.range;
elsif (hdg >= me.threshold_max) elsif (hdg <= me.right.threshold)
norm = -(hdg - me.threshold_max) / (me.heading_max - me.threshold_max); offset = me.right.xoffset_max * (hdg - me.right.threshold) / me.right.range;
var new_offset = me.xoffset_lowpass.filter(norm * me.max_xoffset); var new_offset = me.xoffset_lowpass.filter(offset);
me.xoffsetN.setDoubleValue(me.xoffsetN.getValue() - me.old_offset + new_offset); me.xoffsetN.setDoubleValue(me.xoffsetN.getValue() - me.old_offset + new_offset);
me.old_offset = new_offset; me.old_offset = new_offset;
} }
@ -560,7 +569,7 @@ _setlistener("/sim/signals/fdm-initialized", func {
var limits = views[i].getNode("config/limits/enabled"); var limits = views[i].getNode("config/limits/enabled");
if (limits != nil) { if (limits != nil) {
func (i) { func (i) {
var limiter = { parents: [ pilot_view_limiter ] }; var limiter = pilot_view_limiter.new();
setlistener(limits, func(n) { setlistener(limits, func(n) {
manager.register(i, n.getBoolValue() ? limiter : nil); manager.register(i, n.getBoolValue() ? limiter : nil);
manager.set_view(); manager.set_view();

11
preferences.xml
View file

@ -284,11 +284,16 @@ Started September 2000 by David Megginson, david@megginson.com
<dynamic-view type="bool">true</dynamic-view> <dynamic-view type="bool">true</dynamic-view>
<limits> <limits>
<enabled type="bool">false</enabled> <enabled type="bool">false</enabled>
<heading-min-deg type="double">-140</heading-min-deg> <left>
<heading-max-deg type="double">140</heading-max-deg> <heading-max-deg type="double">140</heading-max-deg>
<x-offset-max-m type="double">0.15</x-offset-max-m> <x-offset-max-m type="double">0.15</x-offset-max-m>
<x-offset-heading-min-deg type="double">-65</x-offset-heading-min-deg> <x-offset-threshold-deg type="double">65</x-offset-threshold-deg>
<x-offset-heading-max-deg type="double">65</x-offset-heading-max-deg> </left>
<right>
<heading-max-deg type="double">140</heading-max-deg>
<x-offset-max-m type="double">0.15</x-offset-max-m>
<x-offset-threshold-deg type="double">65</x-offset-threshold-deg>
</right>
</limits> </limits>
</config> </config>
</view> </view>