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# -*- indent-tabs-mode: nil -*-
class CanvasSamplePrimitives < Gtk::VBox
private
def item_event(item, event)
case event.event_type
when Gdk::Event::BUTTON_PRESS
item_x, item_y = item.parent.w2i(event.x, event.y)
case event.button
when 1
if event.state & Gdk::Window::SHIFT_MASK == Gdk::Window::SHIFT_MASK
item.destroy()
else
@x = item_x;
@y = item_y;
fleur = Gdk::Cursor.new(Gdk::Cursor::FLEUR)
item.grab(Gdk::Event::POINTER_MOTION_MASK | Gdk::Event::BUTTON_RELEASE_MASK,
fleur,
event.time)
@dragging = true
end
when 2
if event.state & Gdk::Window::SHIFT_MASK == Gdk::Window::SHIFT_MASK
item.lower_to_bottom()
else
item.lower(1)
end
when 3
if event.state & Gdk::Window::SHIFT_MASK == Gdk::Window::SHIFT_MASK
item.raise_to_top()
else
item.raise(1)
end
end
when Gdk::Event::MOTION_NOTIFY
item_x, item_y = item.parent.w2i(event.x, event.y)
if @dragging && (event.state & Gdk::Window::BUTTON1_MASK == Gdk::Window::BUTTON1_MASK)
item.move(item_x - @x, item_y - @y)
@x = item_x;
@y = item_y;
end
when Gdk::Event::BUTTON_RELEASE
item.ungrab(event.time)
@dragging = false;
end
end
def setup_item(item)
item.signal_connect("event") do |item, event|
item_event(item, event)
end
end
def setup_heading(root, text, pos)
Gnome::CanvasText.new(root,
{:text => text,
:x => (pos % 3) * 200 + 100,
:y => (pos / 3) * 150 + 5,
:font => "Sans 12",
:anchor => Gtk::ANCHOR_N,
:fill_color => "black"})
end
def setup_divisions(root)
group = Gnome::CanvasGroup.new(root,
{:x => 0.0,
:y => 0.0})
setup_item(group)
Gnome::CanvasRect.new(group,
{:x1 => 0.0,
:y1 => 0.0,
:x2 => 600.0,
:y2 => 450.0,
:outline_color => "black",
:width_units => 4.0})
Gnome::CanvasLine.new(group,
{:points => [[0.0, 150.0], [600.0, 150.0]],
:fill_color => "black",
:width_units => 4.0})
Gnome::CanvasLine.new(group,
{:points => [[0.0, 300.0], [600.0, 300.0]],
:fill_color => "black",
:width_units => 4.0})
Gnome::CanvasLine.new(group,
{:points => [[200.0, 0.0], [200.0, 450.0]],
:fill_color => "black",
:width_units => 4.0})
Gnome::CanvasLine.new(group,
{:points => [[400.0, 0.0], [400.0, 450.0]],
:fill_color => "black",
:width_units => 4.0})
setup_heading(group, "Rectangles", 0)
setup_heading(group, "Ellipses", 1)
setup_heading(group, "Texts", 2)
setup_heading(group, "Images", 3)
setup_heading(group, "Lines", 4)
setup_heading(group, "Curves", 5)
setup_heading(group, "Arcs", 6)
setup_heading(group, "Polygons", 7)
setup_heading(group, "Widgets", 8)
end
Gray50_Width = 2
Gray50_Height = 2
Gray50_Bits = [0x02, 0x01].pack("CC")
def setup_rectangles(root)
setup_item(Gnome::CanvasRect.new(root,
{:x1 => 20.0,
:y1 => 30.0,
:x2 => 70.0,
:y2 => 60.0,
:outline_color => "red",
:width_pixels => 8}))
if root.canvas.aa?
setup_item(Gnome::CanvasRect.new(root,
{:x1 => 90.0,
:y1 => 40.0,
:x2 => 180.0,
:y2 => 100.0,
:fill_color_rgba => 0x3cb37180,
:outline_color => "black",
:width_units => 4.0}))
else
stipple = Gdk::Pixmap.create_from_data(nil, Gray50_Bits, Gray50_Width, Gray50_Height)
setup_item(Gnome::CanvasRect.new(root,
{:x1 => 90.0,
:y1 => 40.0,
:x2 => 180.0,
:y2 => 100.0,
:fill_color => "mediumseagreen",
:fill_stipple => stipple,
:outline_color => "black",
:width_units => 4.0}))
end
setup_item(Gnome::CanvasRect.new(root,
{:x1 => 10.0,
:y1 => 80.0,
:x2 => 80.0,
:y2 => 140.0,
:fill_color => "steelblue"}))
end
def setup_ellipses(root)
setup_item(Gnome::CanvasEllipse.new(root,
{:x1 => 220.0,
:y1 => 30.0,
:x2 => 270.0,
:y2 => 60.0,
:outline_color => "goldenrod",
:width_pixels => 8}))
setup_item(Gnome::CanvasEllipse.new(root,
{:x1 => 290.0,
:y1 => 40.0,
:x2 => 380.0,
:y2 => 100.0,
:fill_color => "wheat",
:outline_color => "midnightblue",
:width_units => 4.0}))
if root.canvas.aa?
setup_item(Gnome::CanvasEllipse.new(root,
{:x1 => 210.0,
:y1 => 80.0,
:x2 => 280.0,
:y2 => 140.0,
:fill_color_rgba => 0x5f9ea080,
:outline_color => "black",
:width_pixels => 0}))
else
stipple = Gdk::Pixmap.create_from_data(nil, Gray50_Bits, Gray50_Width, Gray50_Height)
setup_item(Gnome::CanvasEllipse.new(root,
{:x1 => 210.0,
:y1 => 80.0,
:x2 => 280.0,
:y2 => 140.0,
:fill_color => "cadetblue",
:fill_stipple => stipple,
:outline_color => "black",
:width_pixels => 0}))
end
end
def make_anchor(root, x, y)
group = Gnome::CanvasGroup.new(root,
{:x => x,
:y => y})
setup_item(group)
Gnome::CanvasRect.new(group,
{:x1 => -2.0,
:y1 => -2.0,
:x2 => 2.0,
:y2 => 2.0,
:outline_color => "black",
:width_pixels => 1})
group
end
def setup_texts(root)
if root.canvas.aa?
Gnome::CanvasText.new(make_anchor(root, 420.0, 20.0),
{:text => "Anchor NW",
:x => 0.0,
:y => 0.0,
:font => "Sans Bold 24",
:anchor => Gtk::ANCHOR_NW,
:fill_color_rgba => 0x0000ff80})
else
stipple = Gdk::Pixmap.create_from_data(nil, Gray50_Bits, Gray50_Width, Gray50_Height)
Gnome::CanvasText.new(make_anchor(root, 420.0, 20.0),
{:text => "Anchor NW",
:x => 0.0,
:y => 0.0,
:font => "Sans Bold 24",
:anchor => Gtk::ANCHOR_NW,
:fill_color => "blue",
:fill_stipple => stipple})
end
Gnome::CanvasText.new(make_anchor(root, 470.0, 75.0),
{:text => "Anchor center\nJustify center\nMultiline text",
:x => 0.0,
:y => 0.0,
:font => "monospace bold 14",
:anchor => Gtk::ANCHOR_CENTER,
:justification => Gtk::JUSTIFY_CENTER,
:fill_color => "firebrick"})
Gnome::CanvasText.new(make_anchor(root, 590.0, 140.0),
{:text => "Clipped text\nClipped text\nClipped text\nClipped text\nClipped text\nClipped text",
:x => 0.0,
:y => 0.0,
:font => "Sans 12",
:anchor => Gtk::ANCHOR_SE,
:clip => true,
:clip_width => 50.0,
:clip_height => 55.0,
:x_offset => 10.0,
:fill_color => "darkgreen"})
end
def plant_flower(root, x, y, anchor, aa)
im = Gdk::Pixbuf.new("flower.png")
unless im.nil?
image = Gnome::CanvasPixbuf.new(root,
:pixbuf => im,
:x => x,
:y => y,
:width => im.width,
:height => im.height,
:anchor => anchor)
setup_item(image)
image.signal_connect("destroy", im) do |item, im|
end
end
end
def setup_images(root, aa)
im = Gdk::Pixbuf.new("toroid.png")
unless im.nil?
image = Gnome::CanvasPixbuf.new(root,
{:pixbuf => im,
:x => 100.0,
:y => 225.0,
:width => im.width,
:height => im.height,
:anchor => Gtk::ANCHOR_CENTER})
setup_item(image)
image.signal_connect("destroy", im) do |item, im|
end
end
plant_flower(root, 20.0, 170.0, Gtk::ANCHOR_NW, aa);
plant_flower(root, 180.0, 170.0, Gtk::ANCHOR_NE, aa);
plant_flower(root, 20.0, 280.0, Gtk::ANCHOR_SW, aa);
plant_flower(root, 180.0, 280.0, Gtk::ANCHOR_SE, aa);
end
VERTICES = 10
RADIUS = 60.0
def polish_diamond(root)
group = Gnome::CanvasGroup.new(root,
{:x => 270.0,
:y => 230.0})
setup_item(group)
points = []
0.upto(VERTICES - 1) do |i|
a = 2.0 * Math::PI * i / VERTICES
points[0] = [RADIUS * Math::cos(a), RADIUS * Math::sin(a)]
(i + 1).upto(VERTICES - 1) do |j|
a = 2.0 * Math::PI * j / VERTICES
points[1] = [RADIUS * Math::cos(a), RADIUS * Math::sin(a)]
Gnome::CanvasLine.new(group,
{:points => points,
:fill_color => "black",
:width_units => 1.0,
:cap_style => Gdk::GC::CAP_ROUND})
end
end
end
SCALE = 7.0
def make_hilbert(root)
hilbert = "urdrrulurulldluuruluurdrurddldrrruluurdrurddldrddlulldrdldrrurd"
points = []
points << [340.0, 290.0]
hilbert.split(//).each_with_index do |c, i|
case c
when 'u'
points << [points.last[0], points.last[1] - SCALE]
when 'd'
points << [points.last[0], points.last[1] + SCALE]
when 'l'
points << [points.last[0] - SCALE, points.last[1]]
when 'r'
points << [points.last[0] + SCALE, points.last[1]]
end
end
if root.canvas.aa?
setup_item(Gnome::CanvasLine.new(root,
{:points => points,
:fill_color_rgba => 0xff000080,
:width_units => 4.0,
:cap_style => Gdk::GC::CAP_PROJECTING,
:join_style => Gdk::GC::JOIN_MITER}))
else
stipple = Gdk::Pixmap.create_from_data(nil, Gray50_Bits, Gray50_Width, Gray50_Height)
setup_item(Gnome::CanvasLine.new(root,
{:points => points,
:fill_color => "red",
:fill_stipple => stipple,
:width_units => 4.0,
:cap_style => Gdk::GC::CAP_PROJECTING,
:join_style => Gdk::GC::JOIN_MITER}))
end
end
def setup_lines(root)
polish_diamond(root)
make_hilbert(root)
# Arrow tests
points = [[340.0, 170.0], [340.0, 230.0], [390.0, 230.0], [390.0, 170.0]]
setup_item(Gnome::CanvasLine.new(root,
{:points => points,
:fill_color => "midnightblue",
:width_units => 3.0,
:first_arrowhead => true,
:last_arrowhead => true,
:arrow_shape_a => 8.0,
:arrow_shape_b => 12.0,
:arrow_shape_c => 4.0}))
points = [[356.0, 180.0], [374.0, 220.0]]
setup_item(Gnome::CanvasLine.new(root,
{:points => points,
:fill_color => "blue",
:width_pixels => 0,
:first_arrowhead => true,
:last_arrowhead => true,
:arrow_shape_a => 6.0,
:arrow_shape_b => 6.0,
:arrow_shape_c => 4.0}))
points = [[356.0, 220.0], [374.0, 180.0]]
setup_item(Gnome::CanvasLine.new(root,
{:points => points,
:fill_color => "blue",
:width_pixels => 0,
:first_arrowhead => true,
:last_arrowhead => true,
:arrow_shape_a => 6.0,
:arrow_shape_b => 6.0,
:arrow_shape_c => 4.0}))
end
def setup_curves(root)
path_def = Gnome::CanvasPathDef.new()
path_def.moveto(500.0, 175.0)
path_def.curveto(550.0, 175.0, 550.0, 275.0, 500.0, 275.0)
setup_item(Gnome::CanvasBpath.new(root,
{:bpath => path_def,
:outline_color => "black",
:width_pixels => 4}))
end
def setup_polygons(root)
points = [[210.0, 320.0], [210.0, 380.0], [260.0, 350.0]]
if root.canvas.aa?
setup_item(Gnome::CanvasPolygon.new(root,
{:points => points,
:fill_color_rgba => 0x0000ff80,
:outline_color => "black"}))
else
stipple = Gdk::Pixmap.create_from_data(nil, Gray50_Bits, Gray50_Width, Gray50_Height)
setup_item(Gnome::CanvasPolygon.new(root,
{:points => points,
:fill_color => "blue",
:fill_stipple => stipple,
:outline_color => "black"}))
end
points = []
points << [270.0, 330.0]
points << [270.0, 430.0]
points << [390.0, 430.0]
points << [390.0, 330.0]
points << [310.0, 330.0]
points << [310.0, 390.0]
points << [350.0, 390.0]
points << [350.0, 370.0]
points << [330.0, 370.0]
points << [330.0, 350.0]
points << [370.0, 350.0]
points << [370.0, 410.0]
points << [290.0, 410.0]
points << [290.0, 330.0]
setup_item(Gnome::CanvasPolygon.new(root,
{:points => points,
:fill_color => "tan",
:outline_color => "black",
:width_units => 3.0}))
end
def setup_widgets(root)
w = Gtk::Button.new("Hello world!")
setup_item(Gnome::CanvasWidget.new(root,
{:widget => w,
:x => 420.0,
:y => 330.0,
:width => 100.0,
:height => 40.0,
:anchor => Gtk::ANCHOR_NW,
:size_pixels => FALSE}))
w.show()
end
def key_press(canvas, event)
x, y = canvas.scroll_offsets
case event.keyval
when Gdk::Keyval::GDK_Up
canvas.scroll_to(x, y - 20)
when Gdk::Keyval::GDK_Down
canvas.scroll_to(x, y + 20)
when Gdk::Keyval::GDK_Left
canvas.scroll_to(x - 10, y)
when Gdk::Keyval::GDK_Right
canvas.scroll_to(x + 10, y)
end
end
def initialize(aa)
super(false, 4)
@dragging = false
border_width = 4
show()
w = Gtk::Label.new(<<EOS)
Drag an item with button 1. Click button 2 on an item to lower it,
or button 3 to raise it. Shift+click with buttons 2 or 3 to send
an item to the bottom or top, respectively.
EOS
pack_start(w, false, false, 0)
w.show()
hbox = Gtk::HBox.new(false, 4)
pack_start(hbox, false, false, 0)
hbox.show()
# Create the canvas
canvas = Gnome::Canvas.new(aa)
# Setup canvas items
root = canvas.root
setup_divisions(root)
setup_rectangles(root)
setup_ellipses(root)
setup_texts(root)
setup_images(root, aa)
setup_lines(root)
setup_curves(root)
setup_polygons(root)
setup_widgets(root)
# Zoom
w = Gtk::Label.new("Zoom:")
hbox.pack_start(w, false, false, 0)
w.show()
adj = Gtk::Adjustment.new(1.00, 0.05, 5.00, 0.05, 0.50, 0.50)
adj.signal_connect("value_changed") do
canvas.set_pixels_per_unit(adj.value)
end
w = Gtk::SpinButton.new(adj, 0.0, 2)
w.set_size_request(50, -1)
hbox.pack_start(w, false, false, 0)
w.show()
# Layout the stuff
table = Gtk::Table.new(2, 2, false)
table.set_row_spacings(4)
table.set_column_spacings(4)
pack_start(table, true, true, 0)
table.show()
frame = Gtk::Frame.new()
frame.set_shadow_type(Gtk::SHADOW_IN);
table.attach(frame,
0, 1, 0, 1,
Gtk::EXPAND | Gtk::FILL | Gtk::SHRINK,
Gtk::EXPAND | Gtk::FILL | Gtk::SHRINK,
0, 0)
frame.show()
canvas.set_size_request(600, 450)
canvas.set_scroll_region(0, 0, 600, 450);
frame.add(canvas)
canvas.show()
canvas.signal_connect_after("key_press_event") do |item, event|
key_press(item, event)
end
w = Gtk::HScrollbar.new(canvas.hadjustment)
table.attach(w,
0, 1, 1, 2,
Gtk::EXPAND | Gtk::FILL | Gtk::SHRINK,
Gtk::FILL,
0, 0);
w.show()
w = Gtk::VScrollbar.new(canvas.vadjustment)
table.attach(w,
1, 2, 0, 1,
Gtk::FILL,
Gtk::EXPAND | Gtk::FILL | Gtk::SHRINK,
0, 0);
w.show()
canvas.flags = Gtk::Widget::CAN_FOCUS
canvas.grab_focus()
end
end
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