test.vala

   1 using Gtk;
   2 using Goo;
   3 using Rsvg;
   4 using Cairo;
   5
   6 // https://live.gnome.org/Vala/Tutorial
   7 // https://live.gnome.org/Vala/GTKSample
   8 // http://www.vala-project.org/doc/docu/goocanvas.vapi/index.html
   9
  10 public class SVGItem : Goo.CanvasItemSimple {
  11     private double x;
  12     private double y;
  13     private double height;
  14     private double width;
  15     private Rsvg.Handle rsvg_handle;
  16
  17     public SVGItem (double px, double py, Rsvg.Handle handle) {
  18         stdout.printf("SVGItem::SVGItem\n");
  19         x = px;
  20         y = py;
  21         width = handle.width;
  22         height = handle.height;
  23         rsvg_handle = handle;
  24         stdout.printf(" h=%lf, w=%lf\n", height, width);
  25     }
  26
  27     public override void simple_paint (Cairo.Context cr, Goo.CanvasBounds bounds) {
  28         stdout.printf("SVGItem::simple_paint\n");
  29         Cairo.Matrix matrix;
  30         cr.get_matrix(out matrix);
  31         matrix.translate(x, y);
  32         cr.set_matrix(matrix);
  33         rsvg_handle.render_cairo(cr);
  34         cr.move_to(x, y);
  35         cr.line_to(x, y + height);
  36         cr.line_to(x + width, y + height);
  37         cr.line_to(x + width, y);
  38         cr.close_path();
  39     }
  40
  41     public override void simple_update (Cairo.Context cr) {
  42         stdout.printf("SVGItem::simple_update\n");
  43         bounds.x1 = x;
  44         bounds.x2 = x + width;
  45         bounds.y1 = y;
  46         bounds.y1 = y + height;
  47     }
  48
  49     public override bool simple_is_item_at (double px, double py, Cairo.Context cr, bool is_pointer_event) {
  50         stdout.printf("SVGItem::simple_is_item_at\n");
  51         if (px < x || (px > x + width) || py < y || (py > y + height))
  52         {
  53             return false;
  54         } else {
  55             return true;
  56         }
  57     }
  58 }
  59
  60 int main (string[] args) {
  61     Gtk.init (ref args);
  62
  63     var window = new Window ();
  64     window.title = "Test Program";
  65     window.window_position = WindowPosition.CENTER;
  66     window.set_default_size (640, 600);
  67     window.destroy.connect (Gtk.main_quit);
  68
  69     var scroll = new ScrolledWindow (null, null);
  70     scroll.set_policy (PolicyType.AUTOMATIC, PolicyType.AUTOMATIC);
  71     window.add (scroll);
  72
  73     var canvas = new Canvas ();
  74     canvas.automatic_bounds = true;
  75     scroll.add (canvas);
  76
  77     var root = canvas.get_root_item ();
  78
  79     double zoom = 1.0;
  80     root.set_simple_transform(0, 0, zoom, 0);
  81
  82     canvas.button_press_event.connect ((target, event) => {
  83                     return false;
  84         });
  85
  86     canvas.button_release_event.connect ((target, event) => {
  87                     return false;
  88         });
  89
  90     canvas.motion_notify_event.connect ((target, event) => {
  91                     return false;
  92         });
  93
  94     canvas.scroll_event.connect ((target, event) => {
  95                     if (event.direction == Gdk.ScrollDirection.UP || event.direction == Gdk.ScrollDirection.LEFT)
  96                     {
  97                       zoom *= 0.9;
  98                     } else {
  99                       zoom /= 0.9;
 100                     }
 101                     root.set_simple_transform(0, 0, zoom, 0);
 102                     return false;
 103         });
 104
 105     var red_svg = new Rsvg.Handle.from_file("images/redCircle.svg");
 106
 107     var red_item = new SVGItem (10, 10, red_svg);
 108     red_item.set_parent(root);
 109     root.add_child(red_item, 0);
 110
 111     var rect_item = CanvasRect.create(root, 100, 100, 400, 400,
 112                                    "line-width", 10.0,
 113                                    "radius-x", 20.0,
 114                                    "radius-y", 10.0,
 115                                    "stroke-color", "yellow",
 116                                    "fill-color", "red");
 117
 118     bool dragging = false;
 119     double drag_x = 0;
 120     double drag_y = 0;
 121
 122     rect_item.button_press_event.connect ((target, event) => {
 123                     stdout.printf("Pressed\n");
 124                     if (event.button == 1)
 125                     {
 126                         drag_x = event.x;
 127                         drag_y = event.y;
 128                         dragging = true;
 129                         return true;
 130                     }
 131                     return false;
 132         });
 133
 134     rect_item.button_release_event.connect ((target, event) => {
 135                     stdout.printf("Released\n");
 136                     dragging = false;
 137                     return true;
 138         });
 139
 140     rect_item.motion_notify_event.connect ((target, event) => {
 141                     if (dragging)
 142                     {
 143                         double new_x = event.x;
 144                         double new_y = event.y;
 145                         target.translate(new_x - drag_x, new_y - drag_y);
 146                         return true;
 147                     }
 148                     return false;
 149         });
 150
 151     window.show_all ();
 152
 153     Gtk.main ();
 154     return 0;
 155 }
 156