Vala言語とOpenGL (3)
三角形の回転にScaleウィジェを利用しています。
gtkclutter3.vala
using Gtk;
using GtkClutter;
using Clutter;
public class MainWindow : Gtk.Window
{
private Clutter.Actor coglbox;
private static float alpha;
public MainWindow ()
{
title = "GtkClutterGL";
set_default_size (400, 460);
destroy.connect (Gtk.main_quit);
var vbox = new Gtk.Box (Gtk.Orientation.VERTICAL, 0);
var box2 = new Gtk.Box (Gtk.Orientation.VERTICAL, 0);
var scale = new Gtk.Scale.with_range (Gtk.Orientation.HORIZONTAL, 0, 360, 2);
var button = new Gtk.Button.with_label ("Quit");
button.clicked.connect (Gtk.main_quit);
vbox.pack_start (box2, true, true, 0);
vbox.pack_start (scale, false, false, 0);
vbox.pack_start (button, false, false, 0);
add (vbox);
var widget = new Embed ();
box2.pack_start (widget, true, true, 0);
var stage = widget.get_stage ();
stage.width = stage.height = 400;
stage.background_color = Clutter.Color () { alpha = 255 };
coglbox = new Clutter.Actor ();
stage.add_actor (coglbox);
coglbox.paint.connect (paint_cb);
scale.value_changed.connect *1;
alpha = (float)scale.get_value ();
coglbox.queue_redraw ();
});
}
private void paint_cb ()
{
Cogl.TextureVertex vertices1[3];
Cogl.push_matrix ();
Cogl.translate (200, 200, 0);
Cogl.rotate (alpha, 0, 0, 1);
vertices1[0].x = 0;
vertices1[0].y = -150;
vertices1[0].z = 0;
vertices1[0].color.set_from_4f (1.0f, 0.0f, 0.0f, 1.0f);
vertices1[1].x = -150;
vertices1[1].y = 150;
vertices1[1].z = 0;
vertices1[1].color.set_from_4f (0.0f, 1.0f, 0.0f, 1.0f);
vertices1[2].x = 150;
vertices1[2].y = 150;
vertices1[2].z = 0;
vertices1[2].color.set_from_4f (0.0f, 0.0f, 1.0f, 1.0f);
Cogl.polygon (vertices1, true);
Cogl.pop_matrix();
}
}
void main (string[] args)
{
GtkClutter.init (ref args);
var window = new MainWindow ();
window.show_all ();
Gtk.main ();
}
ビルド
valac --pkg gtk+-3.0 --pkg clutter-gtk-1.0 gtkcluttergl3.vala
Scaleの使い方
１ Scaleウィジェの生成には、Scale.with_rangeメソッドを使います。
var scale = new Gtk.Scale.with_range (Gtk.Orientation.HORIZONTAL, 0, 360, 2);
Scaleの方向、初めの値、終りの値、ステップの値を設定します。
２ Scaleの値によって三角形を回転させるには、value_changedシグナルを使います。
これは、Scaleの親クラスであるRangeのシグナルです。
scale.value_changed.connect *2;
alpha = (float)scale.get_value ();
coglbox.queue_redraw ();
});
