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
|
#!/usr/bin/env python3
"""
Based on cairo-demo/X11/cairo-demo.c
"""
import cairo
import gi
gi.require_version('Gtk', '4.0')
from gi.repository import Gtk
SIZE = 30
class Application(Gtk.Application):
def do_activate(self):
window = Gtk.ApplicationWindow(application=self, default_width=450, default_height=600)
drawing_area = Gtk.DrawingArea()
drawing_area.set_draw_func(self.draw)
window.set_child(drawing_area)
window.present()
def triangle(self, ctx):
ctx.move_to(SIZE, 0)
ctx.rel_line_to(SIZE, 2 * SIZE)
ctx.rel_line_to(-2 * SIZE, 0)
ctx.close_path()
def square(self, ctx):
ctx.move_to(0, 0)
ctx.rel_line_to(2 * SIZE, 0)
ctx.rel_line_to(0, 2 * SIZE)
ctx.rel_line_to(-2 * SIZE, 0)
ctx.close_path()
def bowtie(self, ctx):
ctx.move_to(0, 0)
ctx.rel_line_to(2 * SIZE, 2 * SIZE)
ctx.rel_line_to(-2 * SIZE, 0)
ctx.rel_line_to(2 * SIZE, -2 * SIZE)
ctx.close_path()
def inf(self, ctx):
ctx.move_to(0, SIZE)
ctx.rel_curve_to(0, SIZE, SIZE, SIZE, 2 * SIZE, 0)
ctx.rel_curve_to(SIZE, -SIZE, 2 * SIZE, -SIZE, 2 * SIZE, 0)
ctx.rel_curve_to(0, SIZE, -SIZE, SIZE, - 2 * SIZE, 0)
ctx.rel_curve_to(-SIZE, -SIZE, - 2 * SIZE, -SIZE, - 2 * SIZE, 0)
ctx.close_path()
def draw_shapes(self, ctx, x, y, fill):
ctx.save()
ctx.new_path()
ctx.translate(x + SIZE, y + SIZE)
self.bowtie(ctx)
if fill:
ctx.fill()
else:
ctx.stroke()
ctx.new_path()
ctx.translate(3 * SIZE, 0)
self.square(ctx)
if fill:
ctx.fill()
else:
ctx.stroke()
ctx.new_path()
ctx.translate(3 * SIZE, 0)
self.triangle(ctx)
if fill:
ctx.fill()
else:
ctx.stroke()
ctx.new_path()
ctx.translate(3 * SIZE, 0)
self.inf(ctx)
if fill:
ctx.fill()
else:
ctx.stroke()
ctx.restore()
def fill_shapes(self, ctx, x, y):
self.draw_shapes(ctx, x, y, True)
def stroke_shapes(self, ctx, x, y):
self.draw_shapes(ctx, x, y, False)
def draw(self, da, ctx, width, height):
ctx.set_source_rgb(0, 0, 0)
ctx.set_line_width(SIZE / 4)
ctx.set_tolerance(0.1)
ctx.set_line_join(cairo.LINE_JOIN_ROUND)
ctx.set_dash([SIZE / 4.0, SIZE / 4.0], 0)
self.stroke_shapes(ctx, 0, 0)
ctx.set_dash([], 0)
self.stroke_shapes(ctx, 0, 3 * SIZE)
ctx.set_line_join(cairo.LINE_JOIN_BEVEL)
self.stroke_shapes(ctx, 0, 6 * SIZE)
ctx.set_line_join(cairo.LINE_JOIN_MITER)
self.stroke_shapes(ctx, 0, 9 * SIZE)
self.fill_shapes(ctx, 0, 12 * SIZE)
ctx.set_line_join(cairo.LINE_JOIN_BEVEL)
self.fill_shapes(ctx, 0, 15 * SIZE)
ctx.set_source_rgb(1, 0, 0)
self.stroke_shapes(ctx, 0, 15 * SIZE)
app = Application()
app.run()
|
