Question

I m试图利用捆绑的 j脚带进入一个cl窗。我的问题是,除了略为不同的名称的一半职能外,不管我所尝试的是什么,热罗图也没有显示。我利用了奏效的猪的榜样,并把它放到 j。 I m还利用外推测获得Clutter模块检查。 I m还使用0.7.14的js版本。任何人都能够告诉我什么是错的。

下面是使用Im的范例。

const cairo = imports.cairo;
const clutter =  imports.gi.Clutter;

function on_button_press_event (stage, event) {
    clutter.main_quit();
}

function draw(cairo_tex) {
    var context = cairo_tex.create();


    context.scale(200, 200);
    context.setLineWidth(0.1);
    var colour2 = new clutter.Color();
    colour2.from_string( #dd000088 );
    clutter.cairo_set_source_color(context, colour2);
    context.translate(0.5, 0.5);
    context.arc(0, 0, 0.4, 0, Math.PI * 2);
    context.stroke();
}

function main () {
    clutter.init(0, null);
    var stage = new clutter.Stage();
    var colour = new clutter.Color();
    colour.from_string("#ffccccff");
    stage.set_color(colour);
    stage.set_size(400, 300);
    stage.connect( button-press-event ,  on_button_press_event);
    stage.connect( destroy , clutter.main_quit);

    var cairo_tex = new clutter.CairoTexture.new(200, 200);
    cairo_tex.set_position((stage.get_width() - 200) / 2,
                       (stage.get_height() - 200) / 2);

    draw(cairo_tex);


    var center_x = cairo_tex.get_width() / 2;
    var center_z = cairo_tex.get_height() / 2;
    cairo_tex.set_rotation(clutter.AlignAxis.Y_AXIS, 45.0, center_x, 0, center_z);
    stage.add_actor(cairo_tex);
    cairo_tex.show();

    stage.show();

    clutter.main();
}

main();

I think the reason this is not working has to do with the deletion of the cairo context in javascript. context.destroy does not exist and using delete doesn t either. Infact if I use delete then I get the warning

WARNING:  applying the  delete  operator to an unqualified name is deprecated

这根本无助于。根据参与j的有些开发商所公布的情况,分配到无效的,由于其垃圾收集,应当产生同样的效果。我怀疑在幕后是否有东西可以收集。

如果说情况确实如此,那么我会接受这一说法。

最新资料:

我将问题领域缩小到进口。我尝试了另一个例子,但这次使用Gtk而不是Clutter,以下守则实际上行之有效。

cairo = imports.cairo;
Gtk = imports.gi.Gtk;
Gdk = imports.gi.Gdk;

function draw_arc(drawing_area){
    var cr = Gdk.cairo_create(drawing_area.get_window());

    cr.scale(2, 2);

    cr.operator = cairo.Operator.CLEAR;
    cr.paint();
    cr.operator = cairo.Operator.OVER;

    cr.setSourceRGB(0,255,0);
    cr.arc(128, 128, 76.8, 0, 2*Math.PI);
    cr.fill();

    return false;
}

Gtk.init(0, null);

var w = new Gtk.Window();
w.connect( delete-event , Gtk.main_quit);

var d = new Gtk.DrawingArea();
w.add(d);

w.resize(500,600);
w.decorated = false;

d.connect( draw , draw_arc);

w.show_all();
Gtk.main();

这使我相信,问题不在于执行盖罗,而在于执行Clutter开罗会议的投机方法。我现在想到这一点。 CairoTexture.new or clutter. 《开罗协议》没有适当执行。我怀疑这是utter。 CairoTexture.create, which is caused the problem.

Answer 1

利用Clutter与开罗之间的新融合,特别是Clutter.Canvas,这将吸引一个圈子:

const Clutter = imports.gi.Clutter;
const Cairo = imports.cairo;

const draw_stuff = function (canvas, cr, width, height) {
    cr.save ();
    cr.setOperator (Cairo.Operator.CLEAR);
    cr.paint ();
    cr.restore ();
    cr.setOperator (Cairo.Operator.OVER);
    cr.scale (width, height);
    cr.setLineCap (Cairo.LineCap.ROUND);
    cr.setLineWidth (0.1);

    cr.translate (0.5, 0.5);
    cr.arc (0, 0, 0.4, 0, Math.PI * 2);
    cr.stroke ();

    return true;
};

const test = function () {
    Clutter.init(null);

    let stage = new Clutter.Stage();
    stage.set_title ("Circle!");

    let color = new Clutter.Color({
        red : 255,
        green : 0,
        blue : 0,
        alpha : 128 // Just for the heck of it.
});
stage.set_background_color(color);
stage.set_size(300, 300);

let canvas = new Clutter.Canvas ();
canvas.set_size (155, 155);

let dummy = new Clutter.Actor ();
dummy.set_content (canvas);
dummy.set_size(155, 155);
stage.add_child (dummy);

stage.connect ("destroy", Clutter.main_quit);
canvas.connect ("draw", draw_stuff);
canvas.invalidate ();
stage.show_all();

Clutter.main ();
};

test ();

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