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
|
#pragma once
#define M_PI 3.14159265358979323846
#include <glib.h>
#include <cairo.h>
void
draw_gradient_quad (cairo_t *cr, unsigned width, unsigned height);
void
draw_rotated_quad (cairo_t *cr, double width, double rotation);
void
draw_fps (cairo_t *cr,
double width,
const gchar *str);
void
draw_gradient_circle (cairo_t *cr, unsigned width, unsigned height);
void
draw_rounded_quad (cairo_t *cr, unsigned width, unsigned height);
void
draw_gradient_quad (cairo_t *cr, unsigned width, unsigned height)
{
cairo_pattern_t *pat = cairo_pattern_create_linear (0.0, 0.0, 0.0, height);
cairo_pattern_add_color_stop_rgba (pat, 1, 0, 0, 0, 1);
cairo_pattern_add_color_stop_rgba (pat, 0, 1, 1, 1, 1);
cairo_rectangle (cr, 0, 0, width, height);
cairo_set_source (cr, pat);
cairo_fill (cr);
cairo_pattern_destroy (pat);
}
void
draw_rotated_quad (cairo_t *cr, double width, double rotation)
{
cairo_translate(cr, width/2, width/2);
cairo_rotate(cr, rotation);
cairo_rectangle(cr, -(width/4.0), -(width/4.0), width/2.0, width/2.0);
cairo_set_source_rgb(cr, 0.9, 0.3, 0.3);
cairo_fill(cr);
}
void
draw_fps (cairo_t *cr,
double width,
const gchar *str)
{
cairo_identity_matrix (cr);
cairo_select_font_face (cr, "Sans",
CAIRO_FONT_SLANT_NORMAL,
CAIRO_FONT_WEIGHT_NORMAL);
cairo_set_font_size(cr, 24);
cairo_text_extents_t extents;
cairo_text_extents (cr, str, &extents);
cairo_move_to (cr, width/2 - extents.width/2, width/2 - extents.height/2);
cairo_set_source_rgb (cr, 1.0, 1.0, 1.0);
cairo_show_text (cr, str);
}
void
draw_gradient_circle (cairo_t *cr, unsigned width, unsigned height)
{
double r0;
if (width < height)
r0 = (double) width / 10.0;
else
r0 = (double) height / 10.0;
double radius = r0 * 3.0;
double r1 = r0 * 5.0;
double center_x = (double) width / 2.0;
double center_y = (double) height / 2.0;
double cx0 = center_x - r0 / 2.0;
double cy0 = center_y - r0;
double cx1 = center_x - r0;
double cy1 = center_y - r0;
cairo_pattern_t *pat = cairo_pattern_create_radial (cx0, cy0, r0,
cx1, cy1, r1);
cairo_pattern_add_color_stop_rgba (pat, 0, 1, 1, 1, 1);
cairo_pattern_add_color_stop_rgba (pat, 1, 0, 0, 0, 1);
cairo_set_source (cr, pat);
cairo_arc (cr, center_x, center_y, radius, 0, 2 * M_PI);
cairo_fill (cr);
cairo_pattern_destroy (pat);
cairo_select_font_face (cr, "Sans",
CAIRO_FONT_SLANT_NORMAL,
CAIRO_FONT_WEIGHT_NORMAL);
cairo_set_font_size (cr, 52.0);
cairo_text_extents_t extents;
cairo_text_extents (cr, "R", &extents);
cairo_move_to (cr, center_x, center_y);
cairo_set_source_rgb (cr, 0.8, 0.3, 0.3);
cairo_show_text (cr, "R");
double x_offset = extents.width;
cairo_move_to (cr, center_x + x_offset, center_y);
cairo_set_source_rgb (cr, 0.3, 0.8, 0.3);
cairo_show_text (cr, "G");
cairo_text_extents (cr, "G", &extents);
x_offset += extents.width;
cairo_move_to (cr, center_x + x_offset, center_y);
cairo_set_source_rgb (cr, 0.3, 0.3, 0.8);
cairo_show_text (cr, "B");
}
void
draw_rounded_quad (cairo_t *cr, unsigned width, unsigned height)
{
/* rounded rectangle taken from:
*
* http://cairographics.org/samples/rounded_rectangle/
*
* we leave 1 pixel around the edges to avoid jagged edges
* when rotating the actor
*/
double x = 1.0, /* parameters like cairo_rectangle */
y = 1.0,
width_t = width - 2.0,
height_t = height - 2.0,
aspect = 1.0, /* aspect ratio */
corner_radius = height_t / 20.0; /* and corner curvature radius */
double radius = corner_radius / aspect;
double degrees = M_PI / 180.0;
cairo_save (cr);
cairo_set_operator (cr, CAIRO_OPERATOR_CLEAR);
cairo_paint (cr);
cairo_restore (cr);
cairo_new_sub_path (cr);
cairo_arc (cr, x + width_t - radius, y + radius,
radius, -90 * degrees, 0 * degrees);
cairo_arc (cr, x + width_t - radius, y + height_t - radius,
radius, 0 * degrees, 90 * degrees);
cairo_arc (cr, x + radius, y + height_t - radius,
radius, 90 * degrees, 180 * degrees);
cairo_arc (cr, x + radius, y + radius,
radius, 180 * degrees, 270 * degrees);
cairo_close_path (cr);
cairo_set_source_rgba (cr, 0.5, 0.5, 1, 0.95);
cairo_fill (cr);
}
|
