1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
|
# -*- indent-tabs-mode: nil -*-
class CanvasSampleArrowhead < Gtk::VBox
LEFT = 50.0
RIGHT = 350.0
MIDDLE = 150.0
DEFAULT_WIDTH = 2
DEFAULT_SHAPE_A = 8
DEFAULT_SHAPE_B = 10
DEFAULT_SHAPE_C = 3
private
def set_dimension(arrow, text, x1, y1, x2, y2, tx, ty, dim)
arrow.set({:points => [[x1, y1], [x2, y2]]})
text.set({:text => dim.to_s,
:x => tx,
:y => ty})
end
def move_drag_box(item, x, y)
item.set({:x1 => x - 5.0,
:y1 => y - 5.0,
:x2 => x + 5.0,
:y2 => y + 5.0})
end
def set_arrow_shape(canvas)
# Big arrow
@big_arrow.set({:width_pixels => 10 * @width,
:arrow_shape_a => @shape_a * 10,
:arrow_shape_b => @shape_b * 10,
:arrow_shape_c => @shape_c * 10})
# Outline
points = []
points << [RIGHT - 10 * @shape_a, MIDDLE]
points << [RIGHT - 10 * @shape_b, MIDDLE - 10 * (@shape_c + @width / 2.0)]
points << [RIGHT, MIDDLE]
points << [points[1][0], MIDDLE + 10 * (@shape_c + @width / 2.0)]
points << [points[0][0], points[0][1]]
@outline.set({:points => points})
# Drag boxes
move_drag_box(@width_drag_box, LEFT, MIDDLE - 10 * @width / 2.0)
move_drag_box(@shape_a_drag_box, RIGHT - 10 * @shape_a, MIDDLE)
move_drag_box(@shape_b_c_drag_box, RIGHT - 10 * @shape_b, MIDDLE - 10 * (@shape_c + @width / 2.0))
#Dimensions
set_dimension(@width_arrow, @width_text,
LEFT - 10,
MIDDLE - 10 * @width / 2.0,
LEFT - 10,
MIDDLE + 10 * @width / 2.0,
LEFT - 15,
MIDDLE,
@width);
set_dimension(@shape_a_arrow, @shape_a_text,
RIGHT - 10 * @shape_a,
MIDDLE + 10 * (@width / 2.0 + @shape_c) + 10,
RIGHT,
MIDDLE + 10 * (@width / 2.0 + @shape_c) + 10,
RIGHT - 10 * @shape_a / 2.0,
MIDDLE + 10 * (@width / 2.0 + @shape_c) + 15,
@shape_a);
set_dimension(@shape_b_arrow, @shape_b_text,
RIGHT - 10 * @shape_b,
MIDDLE + 10 * (@width / 2.0 + @shape_c) + 35,
RIGHT,
MIDDLE + 10 * (@width / 2.0 + @shape_c) + 35,
RIGHT - 10 * @shape_b / 2.0,
MIDDLE + 10 * (@width / 2.0 + @shape_c) + 40,
@shape_b);
set_dimension(@shape_c_arrow, @shape_c_text,
RIGHT + 10,
MIDDLE - 10 * @width / 2.0,
RIGHT + 10,
MIDDLE - 10 * (@width / 2.0 + @shape_c),
RIGHT + 15,
MIDDLE - 10 * (@width / 2.0 + @shape_c / 2.0),
@shape_c);
# Info
@width_info.set({:text => @width.to_s})
@shape_a_info.set({:text => @shape_a.to_s})
@shape_b_info.set({:text => @shape_b.to_s})
@shape_c_info.set({:text => @shape_c.to_s})
# Sample arrows
@sample_1.set({:width_pixels => @width,
:arrow_shape_a => @shape_a,
:arrow_shape_b => @shape_b,
:arrow_shape_c => @shape_c})
@sample_2.set({:width_pixels => @width,
:arrow_shape_a => @shape_a,
:arrow_shape_b => @shape_b,
:arrow_shape_c => @shape_c})
@sample_3.set({:width_pixels => @width,
:arrow_shape_a => @shape_a,
:arrow_shape_b => @shape_b,
:arrow_shape_c => @shape_c})
end
def create_drag_box(root)
box = Gnome::CanvasRect.new(root,
{:fill_color => nil,
:outline_color => "black",
:width_pixels => 1})
box.signal_connect("event") do |item, event|
case event.event_type
when Gdk::Event::ENTER_NOTIFY
item.set({:fill_color => "red"})
when Gdk::Event::LEAVE_NOTIFY
if event.state & Gdk::Window::BUTTON1_MASK == 0
item.set({:fill_color => nil})
end
when Gdk::Event::BUTTON_PRESS
fleur = Gdk::Cursor.new(Gdk::Cursor::FLEUR)
item.grab(Gdk::Event::POINTER_MOTION_MASK | Gdk::Event::BUTTON_RELEASE_MASK,
fleur,
event.time)
when Gdk::Event::BUTTON_RELEASE
item.ungrab(event.time)
end
end
box.signal_connect("event", Proc.new()) do |item, event, proc|
proc.call(item, event)
end
box
end
def width_event(item, event)
return if event.event_type != Gdk::Event::MOTION_NOTIFY
return if event.state & Gdk::Window::BUTTON1_MASK == 0
width = (MIDDLE - event.y) / 5.0
return if width < 0.0
@width = width
set_arrow_shape(item.canvas)
end
def shape_a_event(item, event)
return if event.event_type != Gdk::Event::MOTION_NOTIFY
return if event.state & Gdk::Window::BUTTON1_MASK == 0
shape_a = (RIGHT - event.x) / 10.0
return if shape_a < 0.0 || shape_a > 30.0
@shape_a = shape_a
set_arrow_shape(item.canvas)
end
def shape_b_c_event(item, event)
return if event.event_type != Gdk::Event::MOTION_NOTIFY
return if event.state & Gdk::Window::BUTTON1_MASK == 0
change = false
shape_b = (RIGHT - event.x) / 10.0
if shape_b >= 0.0 && shape_b <= 30.0
@shape_b = shape_b
change = true
end
shape_c = (MIDDLE - 5 * @width - event.y) / 10.0
if shape_c >= 0.0
@shape_c = shape_c
change = true
end
set_arrow_shape(item.canvas) if change
end
def create_dimension(root, anchor)
arrow = Gnome::CanvasLine.new(root,
{:fill_color => "black",
:first_arrowhead => true,
:last_arrowhead => true,
:arrow_shape_a => 5.0,
:arrow_shape_b => 5.0,
:arrow_shape_c => 3.0})
text = Gnome::CanvasText.new(root,
{:fill_color => "black",
:font => "Sans 12",
:anchor => anchor})
return arrow, text
end
def create_info(root, x, y)
Gnome::CanvasText.new(root,
{:x => x,
:y => y,
:fill_color => "black",
:font => "Sans 14",
:anchor => Gtk::ANCHOR_NW})
end
def create_sample_arrow(root, x1, y1, x2, y2)
item = Gnome::CanvasLine.new(root,
{:points => [[x1, y1], [x2, y2]],
:fill_color => "black",
:first_arrowhead => true,
:last_arrowhead => true})
item
end
def initialize
super(false, 4)
border_width = 4
show
w = Gtk::Label.new(<<EOS)
This demo allows you to edit arrowhead shapes. Drag the little boxes
to change the shape of the line and its arrowhead. You can see the
arrows at their normal scale on the right hand side of the window.
EOS
pack_start(w, false, false, 0)
w.show()
w = Gtk::Alignment.new(0.5, 0.5, 0.0, 0.0)
pack_start(w, true, true, 0)
w.show()
frame = Gtk::Frame.new()
frame.set_shadow_type(Gtk::SHADOW_IN)
w.add(frame)
frame.show()
canvas = Gnome::Canvas.new()
canvas.set_size_request(500, 350)
canvas.set_scroll_region(0, 0, 500, 350)
frame.add(canvas)
canvas.show()
root = canvas.root
@width = DEFAULT_WIDTH
@shape_a = DEFAULT_SHAPE_A
@shape_b = DEFAULT_SHAPE_B
@shape_c = DEFAULT_SHAPE_C
# Big allow
@big_arrow = Gnome::CanvasLine.new(root,
{:points => [[LEFT, MIDDLE], [RIGHT, MIDDLE]],
:fill_color => "mediumseagreen",
:width_pixels => DEFAULT_WIDTH * 20,
:last_arrowhead => true})
# Arrow outline
@outline = Gnome::CanvasLine.new(root,
{:fill_color => "black",
:width_pixels => 2,
:cap_style => Gdk::GC::CAP_ROUND,
:join_style => Gdk::GC::JOIN_ROUND})
# Drag boxes
@width_drag_box = create_drag_box(root) do |item, event|
width_event(item, event)
end
@shape_a_drag_box = create_drag_box(root) do |item, event|
shape_a_event(item, event)
end
@shape_b_c_drag_box = create_drag_box(root) do |item, event|
shape_b_c_event(item, event)
end
# Dimensions
@width_arrow, @width_text = create_dimension(root, Gtk::ANCHOR_E)
@shape_a_arrow, @shape_a_text = create_dimension(root, Gtk::ANCHOR_N)
@shape_b_arrow, @shape_b_text = create_dimension(root, Gtk::ANCHOR_N)
@shape_c_arrow, @shape_c_text = create_dimension(root, Gtk::ANCHOR_N)
# Info
@width_info = create_info(root, LEFT, 260)
@shape_a_info = create_info(root, LEFT, 280)
@shape_b_info = create_info(root, LEFT, 300)
@shape_c_info = create_info(root, LEFT, 320)
# Division line
Gnome::CanvasLine.new(root,
{:points => [[RIGHT + 50, 0], [RIGHT + 50, 1000]],
:fill_color => "black",
:width_pixels => 2})
# Sample arrows
@sample_1 = create_sample_arrow(root, RIGHT + 100, 30, RIGHT + 100, MIDDLE - 30)
@sample_2 = create_sample_arrow(root, RIGHT + 70, MIDDLE, RIGHT + 130, MIDDLE)
@sample_3 = create_sample_arrow(root, RIGHT + 70, MIDDLE + 30, RIGHT + 130, MIDDLE + 120)
# Done!
set_arrow_shape(canvas)
end
end
|
