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
|
# vim: set fileencoding=utf-8 :
# Written by Behdad Esfahbod, 2014
# Not copyrighted, in public domain.
# A theme file should define two functions:
#
# - prepare_page(renderer): should draw any background and return a tuple of
# x,y,w,h that is the area to use for slide canvas.
#
# - draw_bubble(renderer, x, y, w, h, data=None): should setup canvas for the
# slide to run. Can draw a speaking-bubble for example. x,y,w,h is the
# actual extents that the slide will consume. Data will be the user-data
# dictionary from the slide.
#
# Renderer is an object similar to a cairo.Context and pangocairo.CairoContext
# but has its own methods too. The more useful of them here are put_text and
# put_image. See their pydocs.
import cairo
avatar_margin = .10
logo_margin = .01
footer_margin = .06
padding = .000
bubble_rad = .25
def bubble (cr, x0, y0, x, y, w, h):
r = min (w, h) * (bubble_rad / (1 - 2./8*bubble_rad))
p = r / 7.
x, y, w, h, r = x - p, y - p, w + 2*p, h + 2*p, r + p
x1, y1, x2, y2 = x, y, x + w, y + h
cr.move_to (x1+r, y1)
cr.line_to (x2-r, y1)
cr.curve_to (x2, y1, x2, y1, x2, y1+r)
cr.line_to (x2, y2-r)
cr.curve_to (x2, y2, x2, y2, x2-r, y2)
cr.line_to (x1+r, y2)
cr.curve_to (x1, y2, x1, y2, x1, y2-r)
cr.line_to (x1, y1+r)
cr.curve_to (x1, y1, x1, y1, x1+r, y1)
cr.close_path ()
xc, yc = .5 * (x1 + x2), .5 * (y1 + y2)
cr.move_to (xc+r, yc)
cr.curve_to (xc+r, y0, .5 * (xc+r+x0), (yc+y0*2)/3, x0, y0)
cr.curve_to (.5 * (xc-r+x0), (yc+y0*2)/3, xc-r, y0, xc-r, yc)
def prepare_page (renderer):
cr = renderer.cr
width = renderer.width
height = renderer.height
a = avatar_margin * width
s = (logo_margin + footer_margin) * .5 * width
l = logo_margin * height
f = footer_margin * height
p = padding * min (width, height)
p2 = 2 * p
cr.paint ()
sky = cairo.LinearGradient (0, 0, 0, height)
sky.add_color_stop_rgba (0, 0x02/255., 0x23/255., 0x80/255., 1.)
sky.add_color_stop_rgba (1, 0x9b/255., 0x84/255., 0x66/255., 1.)
cr.set_source (sky)
cr.paint ()
# Background image
#cr.move_to (width / 2., height / 2.)
#renderer.put_image ("pillars.jpg", height = height, width = width)
cr.move_to (.5 * width, height-p2)
b = 150.
cr.set_source_rgb (0x9b/b, 0x84/b, 0x66/b)
renderer.put_text ("TYPO Labs, 10 & 11 May, 2016, Berlin", height=f-p2, valign=-1, desc="")
# Cartoon icons for speakers
who = renderer.data.get ('who', None)
if who:
if who < 0:
cr.move_to (p, height-p)
renderer.put_image ("behdad.png", width = a-p2, valign=-1, halign=+1)
else:
cr.move_to (width-p, height-p)
renderer.put_image (who, width = a-p2, valign=-1, halign=-1)
# Compute rectangle available for slide content
w = width - s - s - p * 2
x = s + p
h = height - l - f - p * 2
y = l + p
# Adjust for bubble padding. the 8 comes from bezier calculations
d = min (w, h) * bubble_rad / 8.
x, y, w, h = x + d, y + d, w - d*2, h - d*2
return x, y, w, h
def draw_bubble (renderer, x, y, w, h, data={}):
# Fancy speech bubble!
cr = renderer.cr
width = renderer.width
height = renderer.height
s = avatar_margin * width
p = padding * min (width, height)
cr.save()
x, y = cr.user_to_device (x, y)
w, h = cr.user_to_device_distance (w, h)
cr.identity_matrix ()
who = data.get ('who', None)
if not who:
xc, yc = x + w*.5, y + h*.5
elif who < 0:
xc, yc = s * .9, height - .7 * s
else:
xc, yc = width - s * .9, height - .7 * s
bubble (cr, xc, yc, x, y, w, h)
cr.rectangle (width, 0, -width, height)
cr.clip ()
bubble (cr, xc, yc, x, y, w, h)
#cr.set_source_rgb (0, 0, 0)
#cr.set_line_width (p)
#cr.set_miter_limit (20)
#cr.stroke_preserve ()
cr.restore ()
cr.clip ()
cr.set_source_rgba (1, 1, 1, .94)
cr.paint ()
b = 700.
cr.set_source_rgb (0xbe/b, 0xa3/b, 0x89/b)
|
