Skip to content

RandomSequence

Demo

Quick Start

randomsequence.py
from terminaltexteffects.effects.effect_random_sequence import RandomSequence

effect = RandomSequence("YourTextHere")
with effect.terminal_output() as terminal:
    for frame in effect:
        terminal.print(frame)

Prints the input data in a random sequence, one character at a time.

Classes:

Name Description
RandomSequence

Prints the input data in a random sequence.
RandomSequenceConfig

Configuration for the RandomSequence effect.
RandomSequenceIterator

Iterator for the RandomSequence effect. Does not normally need to be called directly.

RandomSequence

Bases: BaseEffect[RandomSequenceConfig]

Prints the input data in a random sequence, one character at a time.

Attributes:

Name Type Description
effect_config PourConfig

Configuration for the effect.
terminal_config TerminalConfig

Configuration for the terminal.
Source code in terminaltexteffects/effects/effect_random_sequence.py 
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
class RandomSequence(BaseEffect[RandomSequenceConfig]):
    """Prints the input data in a random sequence, one character at a time.

    Attributes:
        effect_config (PourConfig): Configuration for the effect.
        terminal_config (TerminalConfig): Configuration for the terminal.

    """

    @property
    def _config_cls(self) -> type[RandomSequenceConfig]:
        return RandomSequenceConfig

    @property
    def _iterator_cls(self) -> type[RandomSequenceIterator]:
        return RandomSequenceIterator

RandomSequenceConfig dataclass

Bases: BaseConfig

Configuration for the RandomSequence effect.

Attributes:

Name Type Description
speed float

Speed of the animation as a percentage of the total number of characters to reveal in each tick. Valid values are 0 < n <= 1.
final_gradient_stops tuple[Color, ...]

Tuple of colors for the final color gradient. If only one color is provided, the characters will be displayed in that color.
final_gradient_steps tuple[int, ...] | int

Tuple of the number of gradient steps to use. More steps will create a smoother and longer gradient animation. Valid values are n > 0.
final_gradient_frames int

Number of frames to display each gradient step. Increase to slow down the gradient animation.
final_gradient_direction Direction

Direction of the final gradient.
Source code in terminaltexteffects/effects/effect_random_sequence.py 
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
@dataclass
class RandomSequenceConfig(BaseConfig):
    """Configuration for the RandomSequence effect.

    Attributes:
        speed (float): Speed of the animation as a percentage of the total number of characters to reveal in each tick.
            Valid values are 0 < n <= 1.
        final_gradient_stops (tuple[Color, ...]): Tuple of colors for the final color gradient. If only one color is
            provided, the characters will be displayed in that color.
        final_gradient_steps (tuple[int, ...] | int): Tuple of the number of gradient steps to use. More steps will
            create a smoother and longer gradient animation. Valid values are n > 0.
        final_gradient_frames (int): Number of frames to display each gradient step. Increase to slow down the
            gradient animation.
        final_gradient_direction (Gradient.Direction): Direction of the final gradient.

    """

    parser_spec: argutils.ParserSpec = argutils.ParserSpec(
        name="randomsequence",
        help="Prints the input data in a random sequence.",
        description="randomsequence | Prints the input data in a random sequence.",
        epilog=(
            "Example: terminaltexteffects randomsequence --speed 0.007 --final-gradient-stops 8A008A 00D1FF "
            "ffffff --final-gradient-steps 12 --final-gradient-frames 8 --final-gradient-direction vertical"
        ),
    )

    speed: float = argutils.ArgSpec(
        name="--speed",
        type=argutils.PositiveFloat.type_parser,
        default=0.007,
        metavar=argutils.PositiveFloat.METAVAR,
        help="Speed of the animation as a percentage of the total number of characters to reveal in each tick.",
    )  # pyright: ignore[reportAssignmentType]
    "float : Speed of the animation as a percentage of the total number of characters to reveal in each tick."

    final_gradient_stops: tuple[Color, ...] = FinalGradientStopsArg(
        default=(Color("#8A008A"), Color("#00D1FF"), Color("#FFFFFF")),
    )  # pyright: ignore[reportAssignmentType]
    (
        "tuple[Color, ...] : Tuple of colors for the final color gradient. "
        "If only one color is provided, the characters will be displayed in that color."
    )

    final_gradient_steps: tuple[int, ...] | int = FinalGradientStepsArg(
        default=12,
    )  # pyright: ignore[reportAssignmentType]
    (
        "tuple[int, ...] | int : Int or Tuple of ints for the number of gradient steps to use. "
        "More steps will create a smoother and longer gradient animation."
    )

    final_gradient_frames: int = FinalGradientFramesArg(
        default=8,
    )  # pyright: ignore[reportAssignmentType]
    "int : Number of frames to display each gradient step. Increase to slow down the gradient animation."

    final_gradient_direction: Gradient.Direction = FinalGradientDirectionArg(
        default=Gradient.Direction.VERTICAL,
    )  # pyright: ignore[reportAssignmentType]
    "Gradient.Direction : Direction of the final gradient."

final_gradient_direction = FinalGradientDirectionArg(default=(Gradient.Direction.VERTICAL)) class-attribute instance-attribute

Gradient.Direction : Direction of the final gradient.

final_gradient_frames = FinalGradientFramesArg(default=8) class-attribute instance-attribute

int : Number of frames to display each gradient step. Increase to slow down the gradient animation.

final_gradient_steps = FinalGradientStepsArg(default=12) class-attribute instance-attribute

tuple[int, ...] | int : Int or Tuple of ints for the number of gradient steps to use. More steps will create a smoother and longer gradient animation.

final_gradient_stops = FinalGradientStopsArg(default=(Color('#8A008A'), Color('#00D1FF'), Color('#FFFFFF'))) class-attribute instance-attribute

tuple[Color, ...] : Tuple of colors for the final color gradient. If only one color is provided, the characters will be displayed in that color.

speed = argutils.ArgSpec(name='--speed', type=(argutils.PositiveFloat.type_parser), default=0.007, metavar=(argutils.PositiveFloat.METAVAR), help='Speed of the animation as a percentage of the total number of characters to reveal in each tick.') class-attribute instance-attribute

float : Speed of the animation as a percentage of the total number of characters to reveal in each tick.

RandomSequenceIterator

Bases: BaseEffectIterator[RandomSequenceConfig]

Iterator for the RandomSequence effect.

Source code in terminaltexteffects/effects/effect_random_sequence.py 
 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
class RandomSequenceIterator(BaseEffectIterator[RandomSequenceConfig]):
    """Iterator for the RandomSequence effect."""

    DYNAMIC_NEUTRAL_GRAY = Color("#808080")

    def __init__(self, effect: RandomSequence) -> None:
        """Initialize the effect iterator.

        Args:
            effect (RandomSequence): The effect to use for the iterator.

        """
        super().__init__(effect)
        self.pending_chars: list[EffectCharacter] = []
        self.character_final_color_map: dict[EffectCharacter, ColorPair] = {}
        self.characters_per_tick = max(int(self.config.speed * len(self.terminal._input_characters)), 1)
        self.build()

    def build(self) -> None:
        """Build the initial state of the effect."""
        terminal_background_color = self.terminal.config.terminal_background_color
        final_gradient = Gradient(*self.config.final_gradient_stops, steps=self.config.final_gradient_steps)
        final_gradient_mapping = final_gradient.build_coordinate_color_mapping(
            self.terminal.canvas.text_bottom,
            self.terminal.canvas.text_top,
            self.terminal.canvas.text_left,
            self.terminal.canvas.text_right,
            self.config.final_gradient_direction,
        )
        for character in self.terminal.get_characters():
            if self.terminal.config.existing_color_handling == "dynamic":
                self.character_final_color_map[character] = ColorPair(
                    fg=character.animation.input_fg_color,
                    bg=character.animation.input_bg_color,
                )
            else:
                self.character_final_color_map[character] = ColorPair(
                    fg=final_gradient_mapping[character.input_coord],
                )
            self.terminal.set_character_visibility(character, is_visible=False)
            gradient_scn = character.animation.new_scene()
            if self.terminal.config.existing_color_handling == "dynamic":
                final_fg_color = self.character_final_color_map[character].fg_color
                final_bg_color = self.character_final_color_map[character].bg_color
                if final_fg_color or final_bg_color:
                    fg_gradient = (
                        Gradient(terminal_background_color, final_fg_color, steps=7) if final_fg_color else None
                    )
                    bg_gradient = (
                        Gradient(terminal_background_color, final_bg_color, steps=7) if final_bg_color else None
                    )
                    gradient_scn.apply_gradient_to_symbols(
                        character.input_symbol,
                        self.config.final_gradient_frames,
                        fg_gradient=fg_gradient,
                        bg_gradient=bg_gradient,
                    )
                else:
                    gradient_scn.apply_gradient_to_symbols(
                        character.input_symbol,
                        self.config.final_gradient_frames,
                        fg_gradient=Gradient(terminal_background_color, self.DYNAMIC_NEUTRAL_GRAY, steps=7),
                    )
                    gradient_scn.add_frame(
                        character.input_symbol,
                        self.config.final_gradient_frames,
                        colors=ColorPair(),
                    )
            else:
                final_fg_color = self.character_final_color_map[character].fg_color
                assert final_fg_color is not None
                gradient = Gradient(terminal_background_color, final_fg_color, steps=7)
                gradient_scn.apply_gradient_to_symbols(
                    character.input_symbol,
                    self.config.final_gradient_frames,
                    fg_gradient=gradient,
                )
            character.animation.activate_scene(gradient_scn)
            self.pending_chars.append(character)
        random.shuffle(self.pending_chars)

    def __next__(self) -> str:
        """Return the next frame in the animation."""
        if self.pending_chars or self.active_characters:
            for _ in range(self.characters_per_tick):
                if self.pending_chars:
                    next_char = self.pending_chars.pop()
                    self.terminal.set_character_visibility(next_char, is_visible=True)
                    self.active_characters.add(next_char)
            self.update()
            return self.frame
        raise StopIteration

__init__(effect)

Initialize the effect iterator.

Parameters:

Name Type Description Default
effect RandomSequence

The effect to use for the iterator.

 required
Source code in terminaltexteffects/effects/effect_random_sequence.py 
104
105
106
107
108
109
110
111
112
113
114
115
def __init__(self, effect: RandomSequence) -> None:
    """Initialize the effect iterator.

    Args:
        effect (RandomSequence): The effect to use for the iterator.

    """
    super().__init__(effect)
    self.pending_chars: list[EffectCharacter] = []
    self.character_final_color_map: dict[EffectCharacter, ColorPair] = {}
    self.characters_per_tick = max(int(self.config.speed * len(self.terminal._input_characters)), 1)
    self.build()

__next__()

Return the next frame in the animation.

Source code in terminaltexteffects/effects/effect_random_sequence.py 
180
181
182
183
184
185
186
187
188
189
190
def __next__(self) -> str:
    """Return the next frame in the animation."""
    if self.pending_chars or self.active_characters:
        for _ in range(self.characters_per_tick):
            if self.pending_chars:
                next_char = self.pending_chars.pop()
                self.terminal.set_character_visibility(next_char, is_visible=True)
                self.active_characters.add(next_char)
        self.update()
        return self.frame
    raise StopIteration

build()

Build the initial state of the effect.

Source code in terminaltexteffects/effects/effect_random_sequence.py 
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
def build(self) -> None:
    """Build the initial state of the effect."""
    terminal_background_color = self.terminal.config.terminal_background_color
    final_gradient = Gradient(*self.config.final_gradient_stops, steps=self.config.final_gradient_steps)
    final_gradient_mapping = final_gradient.build_coordinate_color_mapping(
        self.terminal.canvas.text_bottom,
        self.terminal.canvas.text_top,
        self.terminal.canvas.text_left,
        self.terminal.canvas.text_right,
        self.config.final_gradient_direction,
    )
    for character in self.terminal.get_characters():
        if self.terminal.config.existing_color_handling == "dynamic":
            self.character_final_color_map[character] = ColorPair(
                fg=character.animation.input_fg_color,
                bg=character.animation.input_bg_color,
            )
        else:
            self.character_final_color_map[character] = ColorPair(
                fg=final_gradient_mapping[character.input_coord],
            )
        self.terminal.set_character_visibility(character, is_visible=False)
        gradient_scn = character.animation.new_scene()
        if self.terminal.config.existing_color_handling == "dynamic":
            final_fg_color = self.character_final_color_map[character].fg_color
            final_bg_color = self.character_final_color_map[character].bg_color
            if final_fg_color or final_bg_color:
                fg_gradient = (
                    Gradient(terminal_background_color, final_fg_color, steps=7) if final_fg_color else None
                )
                bg_gradient = (
                    Gradient(terminal_background_color, final_bg_color, steps=7) if final_bg_color else None
                )
                gradient_scn.apply_gradient_to_symbols(
                    character.input_symbol,
                    self.config.final_gradient_frames,
                    fg_gradient=fg_gradient,
                    bg_gradient=bg_gradient,
                )
            else:
                gradient_scn.apply_gradient_to_symbols(
                    character.input_symbol,
                    self.config.final_gradient_frames,
                    fg_gradient=Gradient(terminal_background_color, self.DYNAMIC_NEUTRAL_GRAY, steps=7),
                )
                gradient_scn.add_frame(
                    character.input_symbol,
                    self.config.final_gradient_frames,
                    colors=ColorPair(),
                )
        else:
            final_fg_color = self.character_final_color_map[character].fg_color
            assert final_fg_color is not None
            gradient = Gradient(terminal_background_color, final_fg_color, steps=7)
            gradient_scn.apply_gradient_to_symbols(
                character.input_symbol,
                self.config.final_gradient_frames,
                fg_gradient=gradient,
            )
        character.animation.activate_scene(gradient_scn)
        self.pending_chars.append(character)
    random.shuffle(self.pending_chars)

get_effect_resources()

Get the command, effect class, and configuration class for the effect.

Returns:

Type Description
tuple[str, type[BaseEffect], type[BaseConfig]]

tuple[str, type[BaseEffect], type[BaseConfig]]: The command name, effect class, and configuration class.
Source code in terminaltexteffects/effects/effect_random_sequence.py 
26
27
28
29
30
31
32
33
def get_effect_resources() -> tuple[str, type[BaseEffect], type[BaseConfig]]:
    """Get the command, effect class, and configuration class for the effect.

    Returns:
        tuple[str, type[BaseEffect], type[BaseConfig]]: The command name, effect class, and configuration class.

    """
    return "randomsequence", RandomSequence, RandomSequenceConfig