Source modules canvas_efis display-unit.nas
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#------------------------------------------
# display-unit.nas - Canvas EFIS framework
# author: jsb
# created: 12/2017
#------------------------------------------
# Class DisplayUnit (DU) - handles a named display 3D object in the cockpit
# * creates a canvas that is placed on the 3D object once
# * creates an image element on canvas to show source input
# * handles power on/off by (un-)hiding canvas root group
var DisplayUnit =
{
#-- static members
_instances: [],
bgcolor: [0.01, 0.01, 0.01, 1],
# call del() on all instances
unload: func() {
foreach (var instance; DisplayUnit._instances) {
instance.del();
}
DisplayUnit._instances = [];
},
del: func() {
if (me.window != nil) {
me.window.del();
me.window = nil;
}
if (me.placement != nil) {
me.placement.remove();
me.placement = nil;
}
if (me.du_canvas != nil) {
me.du_canvas.del();
me.du_canvas = nil;
}
},
# name: string, used in canvas window title and on DU test canvas
# canvas_settings: hash
# screen_obj: string, name of 3D object for canvas placement
# parent_obj: string, optional parent 3D object for placement
new: func(name, canvas_settings, screen_obj, parent_obj = nil) {
var obj = {
parents: [me],
_id: size(DisplayUnit._instances),
canvas_settings: canvas_settings,
placement_node: screen_obj,
placement_parent: parent_obj,
placement: nil,
du_canvas: nil,
root: nil,
window: nil,
name: name,
img: nil, # canvas image element, shall use other canvas as source
powerN: nil,
};
append(DisplayUnit._instances, obj);
return obj._init();
},
_init: func() {
me.canvas_settings["name"] = "DisplayUnit " ~ size(DisplayUnit._instances);
me.du_canvas = canvas.new(me.canvas_settings).setColorBackground(DisplayUnit.bgcolor);
me.root = me.du_canvas.createGroup();
#-- optional for development: create test image
me._test_img();
me.img = me.root.createChild("image", "DisplayUnit "~me.name);
var place = { parent: me.placement_parent, node: me.placement_node };
me.placement = me.du_canvas.addPlacement(place);
#var status = me.placement.getNode("status-msg",1);
return me;
},
_test_img: func() {
var x = num(me.canvas_settings.view[0])/2 or 20;
var y = num(me.canvas_settings.view[1])/2 or 20;
me.root.createChild("text").setText("'"~me.name~"'\n no source ")
.setColor(1,1,1,1)
.setAlignment("center-center")
.setTranslation(x, y);
var L = int(y/16);
var black = [0, 0, 0, 1];
var blue = [0, 0.2, 0.9, 1];
var yellow = [1, 1, 0, 1];
var grey = [0.7, 0.7, 0.7, 1];
var tl = me.root.createChild("group", "top-left");
var r = tl.createChild("path").rect(L, L, 8*L, 8*L)
.setColorFill(grey);
for (var i=1; i <= 3; i += 1) {
for (var j=1; j <= 8; j += 1) {
var r = tl.createChild("path").rect(i*L, j*L, L, L);
# .setStrokeLineWidth(0);
math.mod(i+j, 2) ? r.setColorFill(black) : r.setColorFill(yellow);
}
}
var F = tl.createChild("path")
.setColorFill(blue)
.setColor(blue)
.setStrokeLineJoin("round")
.setStrokeLineWidth(3);
F.moveTo(5*L, 2*L)
.line(3.5*L, 0).line(0, L).line(-2.5*L, 0)
.line(0, L)
.line(2*L, 0).line(0, L).line(-2*L, 0)
.line(0, 3*L)
.line(-L, 0)
.close();
x = me.canvas_settings.view[0]-L;
y = me.canvas_settings.view[1]-L;
me.root.createChild("path", "square-top-left").rect(0, 0, L, L)
.setColorFill(1,1,1,1);
me.root.createChild("path", "square-top-right").rect(x, 0, L, L)
.setColorFill(1,1,1,1);
me.root.createChild("path", "square-btm-left").rect(0, y, L, L)
.setColorFill(1,1,1,1);
me.root.createChild("path", "square-btm-right").rect(x, y, L, L)
.setColorFill(1,1,1,1);
},
# set a new source path for canvas image element
setSource: func(path) {
#print("DisplayUnit.setSource for "~me.du_canvas.getPath()~" ("~me.name~") to "~path);
if (path == "")
me.img.hide();
else {
me.img.set("src", path);
me.img.show();
}
return me;
},
setPowerSource: func(prop, min) {
me.powerN = props.getNode(prop,1);
setlistener(me.powerN, func(n) {
if ((n.getValue() or 0) >= min) me.root.show();
else me.root.hide();
}, 1, 0);
},
asWindow: func(window_size) {
me.window = canvas.Window.new(window_size, "dialog");
me.window.set('title', "EFIS " ~ me.name)
.set("resize", 1)
.setCanvas(me.du_canvas);
me.window.move(me._id*200, me._id*40);
if (typeof(me.window.lockAspectRatio) == "func")
me.window.lockAspectRatio(1);
me.window.del = func() { call(canvas.Window.del, [], me); }
return me.window
},
};