forked from bevyengine/bevy
-
Notifications
You must be signed in to change notification settings - Fork 0
/
text.rs
144 lines (133 loc) · 4.87 KB
/
text.rs
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
//! This example illustrates how to create UI text and update it in a system.
//!
//! It displays the current FPS in the top left corner, as well as text that changes color
//! in the bottom right. For text within a scene, please see the text2d example.
use bevy::{
diagnostic::{DiagnosticsStore, FrameTimeDiagnosticsPlugin},
prelude::*,
};
fn main() {
App::new()
.add_plugins((DefaultPlugins, FrameTimeDiagnosticsPlugin))
.add_systems(Startup, setup)
.add_systems(Update, (text_update_system, text_color_system))
.run();
}
// A unit struct to help identify the FPS UI component, since there may be many Text components
#[derive(Component)]
struct FpsText;
// A unit struct to help identify the color-changing Text component
#[derive(Component)]
struct ColorText;
fn setup(mut commands: Commands, asset_server: Res<AssetServer>) {
// UI camera
commands.spawn(Camera2dBundle::default());
// Text with one section
commands.spawn((
// Create a TextBundle that has a Text with a single section.
TextBundle::from_section(
// Accepts a `String` or any type that converts into a `String`, such as `&str`
"hello\nbevy!",
TextStyle {
// This font is loaded and will be used instead of the default font.
font: asset_server.load("fonts/FiraSans-Bold.ttf"),
font_size: 100.0,
..default()
},
) // Set the justification of the Text
.with_text_justify(JustifyText::Center)
// Set the style of the TextBundle itself.
.with_style(Style {
position_type: PositionType::Absolute,
bottom: Val::Px(5.0),
right: Val::Px(5.0),
..default()
}),
ColorText,
));
// Text with multiple sections
commands.spawn((
// Create a TextBundle that has a Text with a list of sections.
TextBundle::from_sections([
TextSection::new(
"FPS: ",
TextStyle {
// This font is loaded and will be used instead of the default font.
font: asset_server.load("fonts/FiraSans-Bold.ttf"),
font_size: 60.0,
..default()
},
),
TextSection::from_style(if cfg!(feature = "default_font") {
TextStyle {
font_size: 60.0,
color: Color::GOLD,
// If no font is specified, the default font (a minimal subset of FiraMono) will be used.
..default()
}
} else {
// "default_font" feature is unavailable, load a font to use instead.
TextStyle {
font: asset_server.load("fonts/FiraMono-Medium.ttf"),
font_size: 60.0,
color: Color::GOLD,
}
}),
]),
FpsText,
));
#[cfg(feature = "default_font")]
commands.spawn(
// Here we are able to call the `From` method instead of creating a new `TextSection`.
// This will use the default font (a minimal subset of FiraMono) and apply the default styling.
TextBundle::from("From an &str into a TextBundle with the default font!").with_style(
Style {
position_type: PositionType::Absolute,
bottom: Val::Px(5.0),
left: Val::Px(15.0),
..default()
},
),
);
#[cfg(not(feature = "default_font"))]
commands.spawn(
TextBundle::from_section(
"Default font disabled",
TextStyle {
font: asset_server.load("fonts/FiraMono-Medium.ttf"),
..default()
},
)
.with_style(Style {
position_type: PositionType::Absolute,
bottom: Val::Px(5.0),
left: Val::Px(15.0),
..default()
}),
);
}
fn text_color_system(time: Res<Time>, mut query: Query<&mut Text, With<ColorText>>) {
for mut text in &mut query {
let seconds = time.elapsed_seconds();
// Update the color of the first and only section.
text.sections[0].style.color = Color::Rgba {
red: (1.25 * seconds).sin() / 2.0 + 0.5,
green: (0.75 * seconds).sin() / 2.0 + 0.5,
blue: (0.50 * seconds).sin() / 2.0 + 0.5,
alpha: 1.0,
};
}
}
fn text_update_system(
diagnostics: Res<DiagnosticsStore>,
mut query: Query<&mut Text, With<FpsText>>,
) {
for mut text in &mut query {
if let Some(fps) = diagnostics.get(&FrameTimeDiagnosticsPlugin::FPS) {
if let Some(value) = fps.smoothed() {
// Update the value of the second section
text.sections[1].value = format!("{value:.2}");
}
}
}
}