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ColorShift

Demo

Quick Start

colorshift.py
from terminaltexteffects import Gradient
from terminaltexteffects.effects.effect_colorshift import ColorShift

effect = ColorShift("YourTextHere")
effect.effect_config.travel = True
effect.effect_config.travel_direction = Gradient.Direction.RADIAL
with effect.terminal_output() as terminal:
    for frame in effect:
        terminal.print(frame)

Display a gradient that shifts colors across the terminal.

Classes:

Name Description
ColorShift

Display a gradient that shifts colors across the terminal.
ColorShiftConfig

Configuration for the ColorShift effect.
ColorShiftIterator

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

ColorShift

Bases: BaseEffect[ColorShiftConfig]

Display a gradient that shifts colors across the terminal.

Source code in terminaltexteffects/effects/effect_colorshift.py 
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class ColorShift(BaseEffect[ColorShiftConfig]):
    """Display a gradient that shifts colors across the terminal."""

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

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

ColorShiftConfig dataclass

Bases: ArgsDataClass

Configuration for the ColorShift effect.

Attributes:

Name Type Description
gradient_stops tuple[Color, ...]

Tuple of colors for the gradient. If only one color is provided, the characters will be displayed in that color.
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.
gradient_frames int

Number of frames to display each gradient step. Increase to slow down the gradient animation.
no_loop bool

Do not loop the gradient. If not set, the gradient generation will loop the final gradient color back to the first gradient color.
travel bool

Display the gradient as a traveling wave.
travel_direction Direction

Direction the gradient travels across the canvas.
reverse_travel_direction bool

Reverse the gradient travel direction.
cycles int

Number of times to cycle the gradient. Use 0 for infinite. Valid values are n >= 0.
skip_final_gradient bool

Skip the final gradient.
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 for the final gradient. More steps will create a smoother and longer gradient animation. Valid values are n > 0.
final_gradient_direction Direction

Direction of the final gradient across the canvas.
Source code in terminaltexteffects/effects/effect_colorshift.py 
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@argclass(
    name="colorshift",
    help="Display a gradient that shifts colors across the terminal.",
    description="Display a gradient that shifts colors across the terminal.",
    epilog=(
        "Example: terminaltexteffects colorshift --gradient-stops 0000ff ffffff 0000ff "
        "--gradient-steps 12 --gradient-frames 10 --cycles 3 --travel --travel-direction radial --final-gradient-stops "
        "00c3ff ffff1c --final-gradient-steps 12"
    ),
)
@dataclass
class ColorShiftConfig(ArgsDataClass):
    """Configuration for the ColorShift effect.

    Attributes:
        gradient_stops (tuple[Color, ...]): Tuple of colors for the gradient. If only one color is provided, the
            characters will be displayed in that color.
        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.
        gradient_frames (int): Number of frames to display each gradient step. Increase to slow down the
            gradient animation.
        no_loop (bool): Do not loop the gradient. If not set, the gradient generation will loop the final gradient
            color back to the first gradient color.
        travel (bool): Display the gradient as a traveling wave.
        travel_direction (Gradient.Direction): Direction the gradient travels across the canvas.
        reverse_travel_direction (bool): Reverse the gradient travel direction.
        cycles (int): Number of times to cycle the gradient. Use 0 for infinite. Valid values are n >= 0.
        skip_final_gradient (bool): Skip the final gradient.
        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 for the final
            gradient. More steps will create a smoother and longer gradient animation. Valid values are n > 0.
        final_gradient_direction (Gradient.Direction): Direction of the final gradient across the canvas.

    """

    gradient_stops: tuple[Color, ...] = ArgField(
        cmd_name=["--gradient-stops"],
        type_parser=argvalidators.ColorArg.type_parser,
        nargs="+",
        default=(
            Color("e81416"),
            Color("ffa500"),
            Color("faeb36"),
            Color("79c314"),
            Color("487de7"),
            Color("4b369d"),
            Color("70369d"),
        ),
        metavar=argvalidators.ColorArg.METAVAR,
        help="Space separated, unquoted, list of colors for the gradient.",
    )  # type: ignore[assignment]
    (
        "tuple[Color, ...] : Tuple of colors for the gradient. If only one color is provided, the characters will "
        "be displayed in that color."
    )

    gradient_steps: tuple[int, ...] | int = ArgField(
        cmd_name="--gradient-steps",
        type_parser=argvalidators.PositiveInt.type_parser,
        nargs="+",
        default=12,
        metavar=argvalidators.PositiveInt.METAVAR,
        help="Number of gradient steps to use. More steps will create a smoother gradient animation.",
    )  # type: ignore[assignment]
    (
        "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."
    )

    gradient_frames: int = ArgField(
        cmd_name="--gradient-frames",
        type_parser=argvalidators.PositiveInt.type_parser,
        default=5,
        metavar=argvalidators.PositiveInt.METAVAR,
        help="Number of frames to display each gradient step. Increase to slow down the gradient animation.",
    )  # type: ignore[assignment]
    "int : Number of frames to display each gradient step. Increase to slow down the gradient animation."

    travel: bool = ArgField(
        cmd_name="--travel",
        action="store_true",
        help="Display the gradient as a traveling wave",
    )  # type: ignore[assignment]
    "bool : Display the gradient as a traveling wave."

    travel_direction: Gradient.Direction = ArgField(
        cmd_name="--travel-direction",
        default=Gradient.Direction.HORIZONTAL,
        type_parser=argvalidators.GradientDirection.type_parser,
        metavar=argvalidators.GradientDirection.METAVAR,
        help="Direction the gradient travels across the canvas.",
    )  # type: ignore[assignment]
    "Gradient.Direction : Direction the gradient travels across the canvas."

    reverse_travel_direction: bool = ArgField(
        cmd_name="--reverse-travel-direction",
        action="store_true",
        help="Reverse the gradient travel direction.",
    )  # type: ignore[assignment]
    "bool : Reverse the gradient travel direction."

    no_loop: bool = ArgField(
        cmd_name="--no-loop",
        action="store_true",
        help="Do not loop the gradient. If not set, the gradient generation will loop the final gradient "
        "color back to the first gradient color.",
    )  # type: ignore[assignment]
    (
        "bool : Do not loop the gradient. If not set, the gradient generation will loop the final gradient color "
        "back to the first gradient color."
    )

    cycles: int = ArgField(
        cmd_name="--cycles",
        type_parser=argvalidators.PositiveInt.type_parser,
        default=3,
        metavar=argvalidators.PositiveInt.METAVAR,
        help="Number of times to cycle the gradient.",
    )  # type: ignore[assignment]
    "int : Number of times to cycle the gradient. Use 0 for infinite."

    skip_final_gradient: bool = ArgField(
        cmd_name="--skip-final-gradient",
        action="store_true",
        help="Skip the final gradient.",
    )  # type: ignore[assignment]
    "bool : Skip the final gradient."

    final_gradient_stops: tuple[Color, ...] = ArgField(
        cmd_name=["--final-gradient-stops"],
        type_parser=argvalidators.ColorArg.type_parser,
        nargs="+",
        default=(
            Color("e81416"),
            Color("ffa500"),
            Color("faeb36"),
            Color("79c314"),
            Color("487de7"),
            Color("4b369d"),
            Color("70369d"),
        ),
        metavar=argvalidators.ColorArg.METAVAR,
        help="Space separated, unquoted, list of colors for the character gradient (applied across the canvas). "
        "If only one color is provided, the characters will be displayed in that color.",
    )  # type: ignore[assignment]
    (
        "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 = ArgField(
        cmd_name=["--final-gradient-steps"],
        type_parser=argvalidators.PositiveInt.type_parser,
        nargs="+",
        default=12,
        metavar=argvalidators.PositiveInt.METAVAR,
        help="Space separated, unquoted, list of the number of gradient steps to use. More steps will create a "
        "smoother and longer gradient animation.",
    )  # type: ignore[assignment]
    (
        "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_direction: Gradient.Direction = ArgField(
        cmd_name="--final-gradient-direction",
        type_parser=argvalidators.GradientDirection.type_parser,
        default=Gradient.Direction.VERTICAL,
        metavar=argvalidators.GradientDirection.METAVAR,
        help="Direction of the final gradient.",
    )  # type: ignore[assignment]
    "Gradient.Direction : Direction of the final gradient."

    @classmethod
    def get_effect_class(cls) -> type[ColorShift]:
        """Get the effect class associated with this configuration."""
        return ColorShift

cycles = ArgField(cmd_name='--cycles', type_parser=argvalidators.PositiveInt.type_parser, default=3, metavar=argvalidators.PositiveInt.METAVAR, help='Number of times to cycle the gradient.') class-attribute instance-attribute

int : Number of times to cycle the gradient. Use 0 for infinite.

final_gradient_direction = ArgField(cmd_name='--final-gradient-direction', type_parser=argvalidators.GradientDirection.type_parser, default=Gradient.Direction.VERTICAL, metavar=argvalidators.GradientDirection.METAVAR, help='Direction of the final gradient.') class-attribute instance-attribute

Gradient.Direction : Direction of the final gradient.

final_gradient_steps = ArgField(cmd_name=['--final-gradient-steps'], type_parser=argvalidators.PositiveInt.type_parser, nargs='+', default=12, metavar=argvalidators.PositiveInt.METAVAR, help='Space separated, unquoted, list of the number of gradient steps to use. More steps will create a smoother and longer gradient animation.') 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 = ArgField(cmd_name=['--final-gradient-stops'], type_parser=argvalidators.ColorArg.type_parser, nargs='+', default=(Color('e81416'), Color('ffa500'), Color('faeb36'), Color('79c314'), Color('487de7'), Color('4b369d'), Color('70369d')), metavar=argvalidators.ColorArg.METAVAR, help='Space separated, unquoted, list of colors for the character gradient (applied across the canvas). If only one color is provided, the characters will be displayed in that color.') 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.

gradient_frames = ArgField(cmd_name='--gradient-frames', type_parser=argvalidators.PositiveInt.type_parser, default=5, metavar=argvalidators.PositiveInt.METAVAR, help='Number of frames to display each gradient step. Increase to slow down the gradient animation.') class-attribute instance-attribute

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

gradient_steps = ArgField(cmd_name='--gradient-steps', type_parser=argvalidators.PositiveInt.type_parser, nargs='+', default=12, metavar=argvalidators.PositiveInt.METAVAR, help='Number of gradient steps to use. More steps will create a smoother gradient animation.') 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.

gradient_stops = ArgField(cmd_name=['--gradient-stops'], type_parser=argvalidators.ColorArg.type_parser, nargs='+', default=(Color('e81416'), Color('ffa500'), Color('faeb36'), Color('79c314'), Color('487de7'), Color('4b369d'), Color('70369d')), metavar=argvalidators.ColorArg.METAVAR, help='Space separated, unquoted, list of colors for the gradient.') class-attribute instance-attribute

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

no_loop = ArgField(cmd_name='--no-loop', action='store_true', help='Do not loop the gradient. If not set, the gradient generation will loop the final gradient color back to the first gradient color.') class-attribute instance-attribute

bool : Do not loop the gradient. If not set, the gradient generation will loop the final gradient color back to the first gradient color.

reverse_travel_direction = ArgField(cmd_name='--reverse-travel-direction', action='store_true', help='Reverse the gradient travel direction.') class-attribute instance-attribute

bool : Reverse the gradient travel direction.

skip_final_gradient = ArgField(cmd_name='--skip-final-gradient', action='store_true', help='Skip the final gradient.') class-attribute instance-attribute

bool : Skip the final gradient.

travel = ArgField(cmd_name='--travel', action='store_true', help='Display the gradient as a traveling wave') class-attribute instance-attribute

bool : Display the gradient as a traveling wave.

travel_direction = ArgField(cmd_name='--travel-direction', default=Gradient.Direction.HORIZONTAL, type_parser=argvalidators.GradientDirection.type_parser, metavar=argvalidators.GradientDirection.METAVAR, help='Direction the gradient travels across the canvas.') class-attribute instance-attribute

Gradient.Direction : Direction the gradient travels across the canvas.

get_effect_class() classmethod

Get the effect class associated with this configuration.

Source code in terminaltexteffects/effects/effect_colorshift.py 
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@classmethod
def get_effect_class(cls) -> type[ColorShift]:
    """Get the effect class associated with this configuration."""
    return ColorShift

ColorShiftIterator

Bases: BaseEffectIterator[ColorShiftConfig]

Iterator for the ColorShift effect.

Source code in terminaltexteffects/effects/effect_colorshift.py 
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class ColorShiftIterator(BaseEffectIterator[ColorShiftConfig]):
    """Iterator for the ColorShift effect."""

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

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

        """
        super().__init__(effect)
        self.pending_chars: list[EffectCharacter] = []
        self.character_final_color_map: dict[EffectCharacter, Color] = {}
        self.loop_tracker_map: dict[EffectCharacter, int] = {}
        self.build()

    def loop_tracker(self, character: EffectCharacter) -> None:
        """Track the number of times a character has looped through the gradient."""
        self.loop_tracker_map[character] = self.loop_tracker_map.get(character, 0) + 1
        if self.config.cycles == 0 or (self.loop_tracker_map[character] < self.config.cycles):
            character.animation.activate_scene(character.animation.query_scene("gradient"))
        elif not self.config.skip_final_gradient:
            character.animation.activate_scene(character.animation.query_scene("final_gradient"))

    def build(self) -> None:
        """Build the initial state of the effect."""
        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():
            self.character_final_color_map[character] = final_gradient_mapping[character.input_coord]
        gradient = Gradient(*self.config.gradient_stops, steps=self.config.gradient_steps, loop=not self.config.no_loop)
        for character in self.terminal.get_characters():
            self.terminal.set_character_visibility(character, is_visible=True)
            gradient_scn = character.animation.new_scene(scene_id="gradient")
            if self.config.travel:
                if self.config.travel_direction == Gradient.Direction.HORIZONTAL:
                    direction_index = character.input_coord.column / self.terminal.canvas.right
                elif self.config.travel_direction == Gradient.Direction.VERTICAL:
                    direction_index = character.input_coord.row / self.terminal.canvas.top
                elif self.config.travel_direction == Gradient.Direction.DIAGONAL:
                    direction_index = (character.input_coord.row + character.input_coord.column) / (
                        self.terminal.canvas.right + self.terminal.canvas.top
                    )
                else:  # radial
                    direction_index = geometry.find_normalized_distance_from_center(
                        self.terminal.canvas.text_bottom,
                        self.terminal.canvas.text_top,
                        self.terminal.canvas.text_left,
                        self.terminal.canvas.text_right,
                        character.input_coord,
                    )
                shift_distance = int(len(gradient.spectrum) * direction_index)
                if self.config.reverse_travel_direction:
                    shift_distance = shift_distance * -1
                colors = gradient.spectrum[shift_distance:] + gradient.spectrum[:shift_distance]
            else:
                colors = gradient.spectrum
            for color in colors:
                gradient_scn.add_frame(
                    character.input_symbol,
                    self.config.gradient_frames,
                    colors=ColorPair(fg=color),
                )
            final_color_scn = character.animation.new_scene(scene_id="final_gradient")
            for color in Gradient(colors[-1], self.character_final_color_map[character], steps=8):
                final_color_scn.add_frame(
                    character.input_symbol,
                    self.config.gradient_frames,
                    colors=ColorPair(fg=color),
                )
            character.animation.activate_scene(gradient_scn)
            self.active_characters.add(character)
            character.event_handler.register_event(
                EventHandler.Event.SCENE_COMPLETE,
                gradient_scn,
                EventHandler.Action.CALLBACK,
                EventHandler.Callback(self.loop_tracker),
            )

    def __next__(self) -> str:
        """Return the next frame in the animation."""
        if self.pending_chars or self.active_characters:
            # perform effect logic
            self.update()
            return self.frame
        raise StopIteration

__init__(effect)

Initialize the iterator with the provided effect.

Parameters:

Name Type Description Default
effect ColorShift

The effect to use for the iterator.

 required
Source code in terminaltexteffects/effects/effect_colorshift.py 
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def __init__(self, effect: ColorShift) -> None:
    """Initialize the iterator with the provided effect.

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

    """
    super().__init__(effect)
    self.pending_chars: list[EffectCharacter] = []
    self.character_final_color_map: dict[EffectCharacter, Color] = {}
    self.loop_tracker_map: dict[EffectCharacter, int] = {}
    self.build()

__next__()

Return the next frame in the animation.

Source code in terminaltexteffects/effects/effect_colorshift.py 
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def __next__(self) -> str:
    """Return the next frame in the animation."""
    if self.pending_chars or self.active_characters:
        # perform effect logic
        self.update()
        return self.frame
    raise StopIteration

build()

Build the initial state of the effect.

Source code in terminaltexteffects/effects/effect_colorshift.py 
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def build(self) -> None:
    """Build the initial state of the effect."""
    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():
        self.character_final_color_map[character] = final_gradient_mapping[character.input_coord]
    gradient = Gradient(*self.config.gradient_stops, steps=self.config.gradient_steps, loop=not self.config.no_loop)
    for character in self.terminal.get_characters():
        self.terminal.set_character_visibility(character, is_visible=True)
        gradient_scn = character.animation.new_scene(scene_id="gradient")
        if self.config.travel:
            if self.config.travel_direction == Gradient.Direction.HORIZONTAL:
                direction_index = character.input_coord.column / self.terminal.canvas.right
            elif self.config.travel_direction == Gradient.Direction.VERTICAL:
                direction_index = character.input_coord.row / self.terminal.canvas.top
            elif self.config.travel_direction == Gradient.Direction.DIAGONAL:
                direction_index = (character.input_coord.row + character.input_coord.column) / (
                    self.terminal.canvas.right + self.terminal.canvas.top
                )
            else:  # radial
                direction_index = geometry.find_normalized_distance_from_center(
                    self.terminal.canvas.text_bottom,
                    self.terminal.canvas.text_top,
                    self.terminal.canvas.text_left,
                    self.terminal.canvas.text_right,
                    character.input_coord,
                )
            shift_distance = int(len(gradient.spectrum) * direction_index)
            if self.config.reverse_travel_direction:
                shift_distance = shift_distance * -1
            colors = gradient.spectrum[shift_distance:] + gradient.spectrum[:shift_distance]
        else:
            colors = gradient.spectrum
        for color in colors:
            gradient_scn.add_frame(
                character.input_symbol,
                self.config.gradient_frames,
                colors=ColorPair(fg=color),
            )
        final_color_scn = character.animation.new_scene(scene_id="final_gradient")
        for color in Gradient(colors[-1], self.character_final_color_map[character], steps=8):
            final_color_scn.add_frame(
                character.input_symbol,
                self.config.gradient_frames,
                colors=ColorPair(fg=color),
            )
        character.animation.activate_scene(gradient_scn)
        self.active_characters.add(character)
        character.event_handler.register_event(
            EventHandler.Event.SCENE_COMPLETE,
            gradient_scn,
            EventHandler.Action.CALLBACK,
            EventHandler.Callback(self.loop_tracker),
        )

loop_tracker(character)

Track the number of times a character has looped through the gradient.

Source code in terminaltexteffects/effects/effect_colorshift.py 
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def loop_tracker(self, character: EffectCharacter) -> None:
    """Track the number of times a character has looped through the gradient."""
    self.loop_tracker_map[character] = self.loop_tracker_map.get(character, 0) + 1
    if self.config.cycles == 0 or (self.loop_tracker_map[character] < self.config.cycles):
        character.animation.activate_scene(character.animation.query_scene("gradient"))
    elif not self.config.skip_final_gradient:
        character.animation.activate_scene(character.animation.query_scene("final_gradient"))

get_effect_and_args()

Get the effect class and its configuration class.

Source code in terminaltexteffects/effects/effect_colorshift.py 
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def get_effect_and_args() -> tuple[type[typing.Any], type[ArgsDataClass]]:
    """Get the effect class and its configuration class."""
    return ColorShift, ColorShiftConfig