Goo::Canvas(3)

NAME
Goo::Canvas

HIERARCHY
  Glib::Object
  +----Glib::InitiallyUnowned
       +----Gtk2::Object
            +----Gtk2::Widget
                 +----Gtk2::Container
                      +----Goo::Canvas

INTERFACES
  Glib::Object::_Unregistered::AtkImplementorIface
  Gtk2::Buildable

SYNOPSIS
    use Goo::Canvas;
    use Gtk2 '-init';
    use Glib qw(TRUE FALSE);

    my $window = Gtk2::Window->new('toplevel');
    $window->signal_connect('delete_event' => sub { Gtk2->main_quit; });
    $window->set_default_size(640, 600);

    my $swin = Gtk2::ScrolledWindow->new;
    $swin->set_shadow_type('in');
    $window->add($swin);

    my $canvas = Goo::Canvas->new();
    $canvas->set_size_request(600, 450);
    $canvas->set_bounds(0, 0, 1000, 1000);
    $swin->add($canvas);

    my $root = $canvas->get_root_item();
    my $rect = Goo::Canvas::Rect->new(
        $root, 100, 100, 400, 400,
        'line-width' => 10,
        'radius-x' => 20,
        'radius-y' => 10,
        'stroke-color' => 'yellow',
        'fill-color' => 'red'
    );
    $rect->signal_connect('button-press-event',
                          \&on_rect_button_press);

    my $text = Goo::Canvas::Text->new(
        $root, "Hello World", 300, 300, -1, 'center',
        'font' => 'Sans 24',
    );
    $text->rotate(45, 300, 300);
    $window->show_all();
    Gtk2->main;

    sub on_rect_button_press {
        print "Rect item pressed!\n";
        return TRUE;
    }

DESCRIPTION
GTK+ doesn't has an built-in canvas widget. GooCanvas is wonderful. It is easy to use and has powerful and extensible methods to create items in canvas. Just try it.

For more documents, please read GooCanvas Manual and the demo programs provided in the source distribution in both perl-Goo::Canvas and GooCanvas.

METHODS

  widget = Goo::Canvas->new

  list = $canvas->get_bounds

  $canvas->set_bounds ($left, $top, $right, $bottom)

•   $left (double)

•   $top (double)

•   $right (double)

•   $bottom (double)

  cairo_surface_t = $pixbuf->cairo_surface_from_pixbuf

  $canvas->convert_from_item_space ($item, $x, $y)

•   $item (Goo::Canvas::Item)

•   $x (double)

•   $y (double)

  $canvas->convert_from_pixels ($x, $y)

•   $x (double)

•   $y (double)

  $canvas->convert_to_item_space ($item, $x, $y)

•   $item (Goo::Canvas::Item)

•   $x (double)

•   $y (double)

  $canvas->convert_to_pixels ($x, $y)

•   $x (double)

•   $y (double)

  item = $canvas->create_item ($model)

•   $model (Goo::Canvas::ItemModel)

  $commands->create_path ($cr)

•   $cr (cairo_t)

  double = $canvas->get_default_line_width

  $canvas->grab_focus ($item)

•   $item (Goo::Canvas::Item)

  item = $canvas->get_item_at ($x, $y, $is_pointer_event)

•   $x (double)

•   $y (double)

•   $is_pointer_event (boolean)

  item = $canvas->get_item ($model)

•   $model (Goo::Canvas::ItemModel)

  arrayref = $canvas->get_items_at ($x, $y, $is_pointer_event)

•   $x (double)

•   $y (double)

•   $is_pointer_event (boolean)

  arrayref = $canvas->get_items_in_area ($area, $inside_area, $allow_overlaps, $include_containers)

•   $area (GooCanvasBounds)

•   $inside_area (boolean)

•   $allow_overlaps (boolean)

•   $include_containers (boolean)

  grabstatus = $canvas->keyboard_grab ($item, $owner_events, $time)

•   $item (Goo::Canvas::Item)

•   $owner_events (boolean)

•   $time (unsigned)

  $canvas->keyboard_ungrab ($item, $time)

•   $item (Goo::Canvas::Item)

•   $time (unsigned)

  GArray = $path_data->parse_path_data

  grabstatus = $canvas->pointer_grab ($item, $event_mask, $cursor, $time)

•   $item (Goo::Canvas::Item)

•   $event_mask (Gtk2::Gdk::EventMask)

•   $cursor (Gtk2::Gdk::Cursor) the cursor to display during the grab, or undef means no change

•   $time (unsigned)

  $canvas->pointer_ungrab ($item, $time)

•   $item (Goo::Canvas::Item)

•   $time (unsigned)

  $canvas->register_widget_item ($witem)

•   $witem (Goo::Canvas::Widget)

  $canvas->render ($cr, $bounds, $scale)

•   $cr (cairo_t)

•   $bounds (GooCanvasBounds)

•   $scale (double)

  $canvas->request_redraw ($bounds)

•   $bounds (GooCanvasBounds)

  $canvas->request_update

  item = $canvas->get_root_item

  itemmodel = $canvas->get_root_item_model

  $canvas->set_root_item_model ($model)

•   $model (Goo::Canvas::ItemModel)

  $canvas->set_root_item ($item)

•   $item (Goo::Canvas::Item)

  double = $canvas->get_scale

  $canvas->set_scale ($scale)

•   $scale (double)

  $canvas->scroll_to ($left, $top)

•   $left (double)

•   $top (double)

  $canvas->unregister_item ($model)

•   $model (Goo::Canvas::ItemModel)

  $canvas->unregister_widget_item ($witem)

•   $witem (Goo::Canvas::Widget)

  $canvas->update

PROPERTIES

'anchor' (Gtk2::AnchorType : default "north-west" : readable / writable)
    Where to place the canvas when it is smaller than the widget's allocated area

'automatic-bounds' (boolean : default false : readable / writable)
    If the bounds are automatically calculated based on the bounds of all the items in the canvas

'background-color' (string : default undef : writable)
    The color to use for the canvas background

'background-color-rgb' (Glib::UInt : default 0 : writable)
    The color to use for the canvas background, specified as a 24-bit integer value, 0xRRGGBB

'bounds-from-origin' (boolean : default true : readable / writable)
    If the automatic bounds are calculated from the origin

'bounds-padding' (double : default 0 : readable / writable)
    The padding added to the automatic bounds

'clear-background' (boolean : default true : readable / writable)
    If the background is cleared before the canvas is painted

'integer-layout' (boolean : default false : readable / writable)
    If all item layout is done to the nearest integer

'redraw-when-scrolled' (boolean : default false : readable / writable)
    If the canvas is completely redrawn when scrolled, to reduce the flicker of static items

'resolution-x' (double : default 96 : readable / writable)
    The horizontal resolution of the display, in dots per inch

'resolution-y' (double : default 96 : readable / writable)
    The vertical resolution of the display, in dots per inch

'scale' (double : default 1 : readable / writable)
    The magnification factor of the canvas

'scale-x' (double : default 1 : readable / writable)
    The horizontal magnification factor of the canvas

'scale-y' (double : default 1 : readable / writable)
    The vertical magnification factor of the canvas

'units' (Gtk2::Unit : default "pixel" : readable / writable)
    The units to use for the canvas

'x1' (double : default 0 : readable / writable)
    The x coordinate of the left edge of the canvas bounds, in canvas units

'x2' (double : default 1000 : readable / writable)
    The x coordinate of the right edge of the canvas bounds, in canvas units

'y1' (double : default 0 : readable / writable)
    The y coordinate of the top edge of the canvas bounds, in canvas units

'y2' (double : default 1000 : readable / writable)
    The y coordinate of the bottom edge of the canvas bounds, in canvas units

SIGNALS

set-scroll-adjustments (Goo::Canvas, Gtk2::Adjustment, Gtk2::Adjustment)
item-created (Goo::Canvas, Goo::Canvas::Item, Goo::Canvas::ItemModel)

ENUMS AND FLAGS

  enum Gtk2::AnchorType

•   'center' / 'GTK_ANCHOR_CENTER'

•   'north' / 'GTK_ANCHOR_NORTH'

•   'north-west' / 'GTK_ANCHOR_NORTH_WEST'

•   'north-east' / 'GTK_ANCHOR_NORTH_EAST'

•   'south' / 'GTK_ANCHOR_SOUTH'

•   'south-west' / 'GTK_ANCHOR_SOUTH_WEST'

•   'south-east' / 'GTK_ANCHOR_SOUTH_EAST'

•   'west' / 'GTK_ANCHOR_WEST'

•   'east' / 'GTK_ANCHOR_EAST'

•   'n' / 'GTK_ANCHOR_N'

•   'nw' / 'GTK_ANCHOR_NW'

•   'ne' / 'GTK_ANCHOR_NE'

•   's' / 'GTK_ANCHOR_S'

•   'sw' / 'GTK_ANCHOR_SW'

•   'se' / 'GTK_ANCHOR_SE'

•   'w' / 'GTK_ANCHOR_W'

•   'e' / 'GTK_ANCHOR_E'

  flags Gtk2::Gdk::EventMask

•   'exposure-mask' / 'GDK_EXPOSURE_MASK'

•   'pointer-motion-mask' / 'GDK_POINTER_MOTION_MASK'

•   'pointer-motion-hint-mask' / 'GDK_POINTER_MOTION_HINT_MASK'

•   'button-motion-mask' / 'GDK_BUTTON_MOTION_MASK'

•   'button1-motion-mask' / 'GDK_BUTTON1_MOTION_MASK'

•   'button2-motion-mask' / 'GDK_BUTTON2_MOTION_MASK'

•   'button3-motion-mask' / 'GDK_BUTTON3_MOTION_MASK'

•   'button-press-mask' / 'GDK_BUTTON_PRESS_MASK'

•   'button-release-mask' / 'GDK_BUTTON_RELEASE_MASK'

•   'key-press-mask' / 'GDK_KEY_PRESS_MASK'

•   'key-release-mask' / 'GDK_KEY_RELEASE_MASK'

•   'enter-notify-mask' / 'GDK_ENTER_NOTIFY_MASK'

•   'leave-notify-mask' / 'GDK_LEAVE_NOTIFY_MASK'

•   'focus-change-mask' / 'GDK_FOCUS_CHANGE_MASK'

•   'structure-mask' / 'GDK_STRUCTURE_MASK'

•   'property-change-mask' / 'GDK_PROPERTY_CHANGE_MASK'

•   'visibility-notify-mask' / 'GDK_VISIBILITY_NOTIFY_MASK'

•   'proximity-in-mask' / 'GDK_PROXIMITY_IN_MASK'

•   'proximity-out-mask' / 'GDK_PROXIMITY_OUT_MASK'

•   'substructure-mask' / 'GDK_SUBSTRUCTURE_MASK'

•   'scroll-mask' / 'GDK_SCROLL_MASK'

•   'all-events-mask' / 'GDK_ALL_EVENTS_MASK'

  enum Gtk2::Gdk::GrabStatus

•   'success' / 'GDK_GRAB_SUCCESS'

•   'already-grabbed' / 'GDK_GRAB_ALREADY_GRABBED'

•   'invalid-time' / 'GDK_GRAB_INVALID_TIME'

•   'not-viewable' / 'GDK_GRAB_NOT_VIEWABLE'

•   'frozen' / 'GDK_GRAB_FROZEN'

  enum Gtk2::Unit

•   'pixel' / 'GTK_UNIT_PIXEL'

•   'points' / 'GTK_UNIT_POINTS'

•   'inch' / 'GTK_UNIT_INCH'

•   'mm' / 'GTK_UNIT_MM'

SEE ALSO
Glib::Object, Glib::InitiallyUnowned, Gtk2::Object, Gtk2::Widget, Gtk2::Container

COPYRIGHT
Copyright (C) 2015 Gtk2-Perl Team