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livetrax/libs/canvas/constraint_test4.cc

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#include <iostream>
#include <gtkmm/adjustment.h>
#include <gtkmm/main.h>
#include <gtkmm/window.h>
#include "gtkmm2ext/colors.h"
#include "canvas/box.h"
#include "canvas/canvas.h"
#include "canvas/circle.h"
#include "canvas/constrained_item.h"
#include "canvas/constraint_packer.h"
#include "canvas/rectangle.h"
#include "canvas/text.h"
using namespace ArdourCanvas;
using namespace Gtk;
using std::cerr;
using std::endl;
int
main (int argc, char* argv[])
{
Gtk::Main app (&argc, &argv);
Gtk::Window win;
Gtk::Adjustment hadj (0, 0, 1000, 1, 10);
Gtk::Adjustment vadj (0, 0, 1000, 1, 10);
GtkCanvasViewport cview (hadj, vadj);
Canvas* c = cview.canvas ();
c->set_background_color (0xffffffff);
srandom (time ((time_t) 0));
win.add (cview);
/* Make some items */
Rectangle* r1 = new Rectangle (c);
Rectangle* r2 = new Rectangle (c);
Rectangle* r3 = new Rectangle (c);
r1->set_fill_color (Gtkmm2ext::random_color());
r2->set_fill_color (Gtkmm2ext::random_color());
r3->set_fill_color (Gtkmm2ext::random_color());
r1->name = "L";
r2->name = "R";
r3->name = "C";
r1->set_intrinsic_size (20, 20);
r2->set_intrinsic_size (30, 30);
r3->set_intrinsic_size (40, 40);
Text* txt = new Text (c);
txt->name = "text";
Pango::FontDescription font ("Sans");
txt->set_font_description (font);
txt->set ("hello world");
Rectangle* bb = new Rectangle (c);
bb->set_fill_color (Gtkmm2ext::random_color());
Circle* circ = new Circle (c);
circ->name = "circle";
circ->set_fill_color (Gtkmm2ext::random_color());
circ->set_outline_color (Gtkmm2ext::random_color());
/* create a container */
ConstraintPacker* packer = new ConstraintPacker (c->root());
/* give it a minimum size */
packer->set_intrinsic_size (100, 100);
/* add stuff */
ConstrainedItem* left = packer->add_constrained (r1);
ConstrainedItem* right = packer->add_constrained (r2);
ConstrainedItem* center = packer->add_constrained (r3);
ConstrainedItem* text = packer->add_constrained (txt);
ConstrainedItem* bens_box = packer->add_constrained (bb);
ConstrainedItem* circle = packer->add_constrained (circ);
/* first, constraints that connect an item dimension to the container dimensions or a constant */
packer->constrain (left->left() == 0);
packer->constrain (left->height() == packer->height);
packer->constrain (left->top() == 0);
packer->constrain (left->width() == 0.5 * packer->width);
packer->constrain (right->right() == packer->width);
packer->constrain (center->height() == 0.5 * packer->height);
/* second, constraints that connect an item dimension to other items */
center->right_of (*left, 50);
right->right_of (*center);
center->same_width_as (*right);
right->same_width_as (*center);
right->same_height_as (*left);
center->top_aligned_with (*left);
right->top_aligned_with (*center);
/* XXX this needs to somehow move into ConstraintPacker but I currently
* see no way to build a constraint from a container of
* ConstrainedItems
*/
packer->constrain (left->width() + right->width() + center->width() +
left->left_padding() + left->right_padding() +
center->left_padding() + center->right_padding() +
right->left_padding() + right->right_padding()
== packer->width);
/* Text at a fixed position */
text->at (Duple (150, 50));
/* Rectangle of fixed position and size */
bens_box->box (Rect (40, 40, 80, 80));
/* a circle sized and centered */
circle->size (Duple (30, 30));
circle->centered_on (*center);
win.show_all ();
app.run ();
return 0;
}