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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: BaseConfig

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.
no_travel bool

Do not display the gradient as a 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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@dataclass
class ColorShiftConfig(BaseConfig):
    """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.
        no_travel (bool): Do not display the gradient as a 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.

    """

    parser_spec: ParserSpec = ParserSpec(
        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 "
            "--final-gradient-stops 00c3ff ffff1c --final-gradient-steps 12"
        ),
    )

    gradient_stops: tuple[Color, ...] = ArgSpec(
        name="--gradient-stops",
        type=argutils.ColorArg.type_parser,
        nargs="+",
        action=argutils.TupleAction,
        default=(
            Color("#e81416"),
            Color("#ffa500"),
            Color("#faeb36"),
            Color("#79c314"),
            Color("#487de7"),
            Color("#4b369d"),
            Color("#70369d"),
        ),
        metavar=argutils.ColorArg.METAVAR,
        help="Space separated, unquoted, list of colors for the gradient.",
    )  # pyright: ignore[reportAssignmentType]
    (
        "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 = ArgSpec(
        name="--gradient-steps",
        type=argutils.PositiveInt.type_parser,
        nargs="+",
        action=argutils.TupleAction,
        default=12,
        metavar=argutils.PositiveInt.METAVAR,
        help="Number of gradient steps to use. More steps will create a smoother gradient animation.",
    )  # 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."
    )

    gradient_frames: int = ArgSpec(
        name="--gradient-frames",
        type=argutils.PositiveInt.type_parser,
        default=2,
        metavar=argutils.PositiveInt.METAVAR,
        help="Number of frames to display each gradient step. Increase to slow down the gradient animation.",
    )  # pyright: ignore[reportAssignmentType]
    "int : Number of frames to display each gradient step. Increase to slow down the gradient animation."

    no_travel: bool = ArgSpec(
        name="--no-travel",
        default=False,
        action="store_true",
        help="Do not display the gradient as a wave.",
    )  # pyright: ignore[reportAssignmentType]
    "bool : Do not display the gradient as a wave."

    travel_direction: Gradient.Direction = ArgSpec(
        name="--travel-direction",
        default=Gradient.Direction.RADIAL,
        type=argutils.GradientDirection.type_parser,
        metavar=argutils.GradientDirection.METAVAR,
        help="Direction the gradient travels across the canvas.",
    )  # pyright: ignore[reportAssignmentType]
    "Gradient.Direction : Direction the gradient travels across the canvas."

    reverse_travel_direction: bool = ArgSpec(
        name="--reverse-travel-direction",
        default=False,
        action="store_true",
        help="Reverse the gradient travel direction.",
    )  # pyright: ignore[reportAssignmentType]
    "bool : Reverse the gradient travel direction."

    no_loop: bool = ArgSpec(
        name="--no-loop",
        default=False,
        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.",
    )  # pyright: ignore[reportAssignmentType]
    (
        "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 = ArgSpec(
        name="--cycles",
        type=argutils.PositiveInt.type_parser,
        default=3,
        metavar=argutils.PositiveInt.METAVAR,
        help="Number of times to cycle the gradient.",
    )  # pyright: ignore[reportAssignmentType]
    "int : Number of times to cycle the gradient. Use 0 for infinite."

    skip_final_gradient: bool = ArgSpec(
        name="--skip-final-gradient",
        default=False,
        action="store_true",
        help="Skip the final gradient.",
    )  # pyright: ignore[reportAssignmentType]
    "bool : Skip the final gradient."

    final_gradient_stops: tuple[Color, ...] = ArgSpec(
        name="--final-gradient-stops",
        type=argutils.ColorArg.type_parser,
        nargs="+",
        action=argutils.TupleAction,
        default=(
            Color("#e81416"),
            Color("#ffa500"),
            Color("#faeb36"),
            Color("#79c314"),
            Color("#487de7"),
            Color("#4b369d"),
            Color("#70369d"),
        ),
        metavar=argutils.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.",
    )  # 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 = ArgSpec(
        name="--final-gradient-steps",
        type=argutils.PositiveInt.type_parser,
        nargs="+",
        action=argutils.TupleAction,
        default=12,
        metavar=argutils.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.",
    )  # 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_direction: Gradient.Direction = ArgSpec(
        name="--final-gradient-direction",
        type=argutils.GradientDirection.type_parser,
        default=Gradient.Direction.VERTICAL,
        metavar=argutils.GradientDirection.METAVAR,
        help="Direction of the final gradient.",
    )  # pyright: ignore[reportAssignmentType]
    "Gradient.Direction : Direction of the final gradient."

cycles = ArgSpec(name='--cycles', type=(argutils.PositiveInt.type_parser), default=3, metavar=(argutils.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 = ArgSpec(name='--final-gradient-direction', type=(argutils.GradientDirection.type_parser), default=(Gradient.Direction.VERTICAL), metavar=(argutils.GradientDirection.METAVAR), help='Direction of the final gradient.') class-attribute instance-attribute

Gradient.Direction : Direction of the final gradient.

final_gradient_steps = ArgSpec(name='--final-gradient-steps', type=(argutils.PositiveInt.type_parser), nargs='+', action=(argutils.TupleAction), default=12, metavar=(argutils.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 = ArgSpec(name='--final-gradient-stops', type=(argutils.ColorArg.type_parser), nargs='+', action=(argutils.TupleAction), default=(Color('#e81416'), Color('#ffa500'), Color('#faeb36'), Color('#79c314'), Color('#487de7'), Color('#4b369d'), Color('#70369d')), metavar=(argutils.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 = ArgSpec(name='--gradient-frames', type=(argutils.PositiveInt.type_parser), default=2, metavar=(argutils.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 = ArgSpec(name='--gradient-steps', type=(argutils.PositiveInt.type_parser), nargs='+', action=(argutils.TupleAction), default=12, metavar=(argutils.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 = ArgSpec(name='--gradient-stops', type=(argutils.ColorArg.type_parser), nargs='+', action=(argutils.TupleAction), default=(Color('#e81416'), Color('#ffa500'), Color('#faeb36'), Color('#79c314'), Color('#487de7'), Color('#4b369d'), Color('#70369d')), metavar=(argutils.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 = ArgSpec(name='--no-loop', default=False, 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.

no_travel = ArgSpec(name='--no-travel', default=False, action='store_true', help='Do not display the gradient as a wave.') class-attribute instance-attribute

bool : Do not display the gradient as a wave.

reverse_travel_direction = ArgSpec(name='--reverse-travel-direction', default=False, action='store_true', help='Reverse the gradient travel direction.') class-attribute instance-attribute

bool : Reverse the gradient travel direction.

skip_final_gradient = ArgSpec(name='--skip-final-gradient', default=False, action='store_true', help='Skip the final gradient.') class-attribute instance-attribute

bool : Skip the final gradient.

travel_direction = ArgSpec(name='--travel-direction', default=(Gradient.Direction.RADIAL), type=(argutils.GradientDirection.type_parser), metavar=(argutils.GradientDirection.METAVAR), help='Direction the gradient travels across the canvas.') class-attribute instance-attribute

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

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("gradient")
        elif not self.config.skip_final_gradient:
            character.animation.activate_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.no_travel:
                colors = gradient.spectrum
            else:
                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]
            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.no_travel:
            colors = gradient.spectrum
        else:
            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]
        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("gradient")
    elif not self.config.skip_final_gradient:
        character.animation.activate_scene("final_gradient")

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_colorshift.py 
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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 "colorshift", ColorShift, ColorShiftConfig