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FlightGear Newsletter April 2017: Difference between revisions
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== Development news == | == Development news == | ||
=== Creating Canvas UI dialogs procedurally === | |||
[[File:Draw-masks-via-canvas.png|thumb|FlightGear [[Draw masks]] GUI dialog procedurally created by the [[Canvas]] system.s]] | |||
Most end-users will hardly be familiar with so called [[Draw masks]], however one stated goal is to add more node bits (and a GUI dialog to control them) so various categories of objects can be disabled during the update pass. | |||
This will mean the direct hit of, say, AI models vs particles vs random trees can be measured. | |||
Of course it won't account for resources (memory, textures) burned by such things, but would still help different people identify slowness on their setups. <ref>{{cite web | |||
|url = https://sourceforge.net/p/flightgear/mailman/message/29564161/ | |||
|title = <nowiki> Re: [Flightgear-devel] Rendering passes question </nowiki> | |||
|author = <nowiki> James Turner </nowiki> | |||
|date = Jul 19th, 2012 | |||
|added = Jul 19th, 2012 | |||
|script_version = 0.40 | |||
}}</ref> | |||
The following snippet of Nasal/Canvas code (mostly based on code taken from [[Canvas Snippets]] demonstrates how easily such a dialog can be procedurally created using the Canvas system: | |||
<syntaxhighlight lang="nasal"> | |||
var (width,height) = (320,160); | |||
var title = 'Draw Masks'; | |||
var window = canvas.Window.new([width,height],"dialog").set('title',title); | |||
window.del = func() | |||
{ | |||
print("Cleaning up window:",title,"\n"); | |||
call(canvas.Window.del, [], me); | |||
}; | |||
# adding a canvas to the new window and setting up background colors/transparency | |||
var myCanvas = window.createCanvas().set("background", canvas.style.getColor("bg_color")); | |||
# creating the top-level/root group which will contain all other elements/group | |||
var root = myCanvas.createGroup(); | |||
var drawMasks = props.globals.getNode("/sim/rendering/draw-mask").getChildren(); | |||
# create a new layout | |||
window.Layout = canvas.VBoxLayout.new(); | |||
# assign it to the Canvas | |||
myCanvas.setLayout(window.Layout); | |||
foreach(var mask; drawMasks) { | |||
(func() { | |||
var m = mask; | |||
# print("Found mask:", mask.getName(), "=", mask.getValue() ); | |||
var checkbox = canvas.gui.widgets.CheckBox.new(root, canvas.style, {wordWrap: 0}) | |||
.setText( "render " ~ m.getName() ) | |||
.listen("toggled", func(e) { | |||
setprop(m.getPath(), e.detail.checked); | |||
}) | |||
.setChecked( m.getValue() ); | |||
window.Layout.addItem(checkbox); | |||
}) (); | |||
} | |||
</syntaxhighlight> | |||
== In the hangar == | == In the hangar == | ||