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Slide

Demo

Quick Start

slide.py
from terminaltexteffects.effects.effect_slide import Slide

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

Slide characters into view from outside the terminal.

Classes:

Name Description
Slide

Slide characters into view from outside the terminal.
SlideConfig

Configuration for the Slide effect.
SlideIterator

Effect iterator for the Slide effect. Does not normally need to be called directly.

Slide

Bases: BaseEffect[SlideConfig]

Slides characters into view from outside the terminal.

Attributes:

Name Type Description
effect_config SlideConfig

Configuration for the effect.
terminal_config TerminalConfig

Configuration for the terminal.
Source code in terminaltexteffects/effects/effect_slide.py 
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class Slide(BaseEffect[SlideConfig]):
    """Slides characters into view from outside the terminal.

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

    """

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

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

SlideConfig dataclass

Bases: ArgsDataClass

Configuration for the Slide effect.

Attributes:

Name Type Description
movement_speed float

Speed of the characters. Valid values are n > 0.
grouping Literal['row', 'column', 'diagonal']

Direction to group characters. Valid values are 'row', 'column', 'diagonal'.
gap int

Number of frames to wait before adding the next group of characters. Increasing this value creates a more staggered effect. Valid values are n >= 0.
reverse_direction bool

Reverse the direction of the characters.
merge bool

Merge the character groups originating.
movement_easing EasingFunction

Easing function to use for character movement.
final_gradient_stops tuple[Color, ...]

Tuple of colors for the character 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 gradient.
Source code in terminaltexteffects/effects/effect_slide.py 
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@argclass(
    name="slide",
    help="Slide characters into view from outside the terminal.",
    description="slide | Slide characters into view from outside the terminal, grouped by row, column, or diagonal.",
    epilog=(
        f"{argvalidators.EASING_EPILOG} Example: terminaltexteffects slide --movement-speed 0.5 --grouping row "
        "--final-gradient-stops 833ab4 fd1d1d fcb045 --final-gradient-steps 12 --final-gradient-frames 10 "
        "--final-gradient-direction vertical --gap 3 --reverse-direction --merge --movement-easing OUT_QUAD"
    ),
)
@dataclass
class SlideConfig(ArgsDataClass):
    """Configuration for the Slide effect.

    Attributes:
        movement_speed (float): Speed of the characters. Valid values are n > 0.
        grouping (typing.Literal["row", "column", "diagonal"]): Direction to group characters. Valid values are
            'row', 'column', 'diagonal'.
        gap (int): Number of frames to wait before adding the next group of characters. Increasing this value
            creates a more staggered effect. Valid values are n >= 0.
        reverse_direction (bool): Reverse the direction of the characters.
        merge (bool): Merge the character groups originating.
        movement_easing (easing.EasingFunction): Easing function to use for character movement.
        final_gradient_stops (tuple[Color, ...]): Tuple of colors for the character 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 gradient.

    """

    movement_speed: float = ArgField(
        cmd_name="--movement-speed",
        type_parser=argvalidators.PositiveFloat.type_parser,
        default=0.5,
        metavar=argvalidators.PositiveFloat.METAVAR,
        help="Speed of the characters.",
    )  # type: ignore[assignment]
    "float : Speed of the characters."

    grouping: typing.Literal["row", "column", "diagonal"] = ArgField(
        cmd_name="--grouping",
        default="row",
        choices=["row", "column", "diagonal"],
        help="Direction to group characters.",
    )  # type: ignore[assignment]
    (
        "typing.Literal['row', 'column', 'diagonal'] : Direction to group characters. Valid values are "
        "Literal['row', 'column', 'diagonal']."
    )

    gap: int = ArgField(
        cmd_name="--gap",
        type_parser=argvalidators.NonNegativeInt.type_parser,
        default=3,
        metavar=argvalidators.NonNegativeInt.METAVAR,
        help="Number of frames to wait before adding the next group of characters. Increasing this value creates a "
        "more staggered effect.",
    )  # type: ignore[assignment]
    (
        "int : Number of frames to wait before adding the next group of characters. Increasing this value creates a "
        "more staggered effect."
    )

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

    merge: bool = ArgField(
        cmd_name="--merge",
        action="store_true",
        help="Merge the character groups originating from either side of the terminal. (--reverse-direction is "
        "ignored when merging)",
    )  # type: ignore[assignment]
    "bool : Merge the character groups originating from either side of the terminal."

    movement_easing: easing.EasingFunction = ArgField(
        cmd_name=["--movement-easing"],
        default=easing.in_out_quad,
        type_parser=argvalidators.Ease.type_parser,
        metavar=argvalidators.Ease.METAVAR,
        help="Easing function to use for character movement.",
    )  # type: ignore[assignment]
    "easing.EasingFunction : Easing function to use for character movement."

    final_gradient_stops: tuple[Color, ...] = ArgField(
        cmd_name=["--final-gradient-stops"],
        type_parser=argvalidators.ColorArg.type_parser,
        nargs="+",
        default=(Color("#833ab4"), Color("#fd1d1d"), Color("#fcb045")),
        metavar=argvalidators.ColorArg.METAVAR,
        help="Space separated, unquoted, list of colors for the character gradient. If only one color is provided, "
        "the characters will be displayed in that color.",
    )  # type: ignore[assignment]
    (
        "tuple[Color, ...] : Tuple of colors for the character 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,
        default=12,
        metavar=argvalidators.PositiveInt.METAVAR,
        help="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_frames: int = ArgField(
        cmd_name="--final-gradient-frames",
        type_parser=argvalidators.PositiveInt.type_parser,
        default=10,
        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."

    final_gradient_direction: Gradient.Direction = ArgField(
        cmd_name="--final-gradient-direction",
        default=Gradient.Direction.VERTICAL,
        type_parser=argvalidators.GradientDirection.type_parser,
        help="Direction of the gradient (vertical, horizontal, diagonal, center).",
    )  # type: ignore[assignment]
    "Gradient.Direction : Direction of the gradient."

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

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

Gradient.Direction : Direction of the gradient.

final_gradient_frames = ArgField(cmd_name='--final-gradient-frames', type_parser=argvalidators.PositiveInt.type_parser, default=10, 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.

final_gradient_steps = ArgField(cmd_name='--final-gradient-steps', type_parser=argvalidators.PositiveInt.type_parser, default=12, metavar=argvalidators.PositiveInt.METAVAR, help='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('#833ab4'), Color('#fd1d1d'), Color('#fcb045')), metavar=argvalidators.ColorArg.METAVAR, help='Space separated, unquoted, list of colors for the character gradient. 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 character gradient. If only one color is provided, the characters will be displayed in that color.

gap = ArgField(cmd_name='--gap', type_parser=argvalidators.NonNegativeInt.type_parser, default=3, metavar=argvalidators.NonNegativeInt.METAVAR, help='Number of frames to wait before adding the next group of characters. Increasing this value creates a more staggered effect.') class-attribute instance-attribute

int : Number of frames to wait before adding the next group of characters. Increasing this value creates a more staggered effect.

grouping = ArgField(cmd_name='--grouping', default='row', choices=['row', 'column', 'diagonal'], help='Direction to group characters.') class-attribute instance-attribute

typing.Literal['row', 'column', 'diagonal'] : Direction to group characters. Valid values are Literal['row', 'column', 'diagonal'].

merge = ArgField(cmd_name='--merge', action='store_true', help='Merge the character groups originating from either side of the terminal. (--reverse-direction is ignored when merging)') class-attribute instance-attribute

bool : Merge the character groups originating from either side of the terminal.

movement_easing = ArgField(cmd_name=['--movement-easing'], default=easing.in_out_quad, type_parser=argvalidators.Ease.type_parser, metavar=argvalidators.Ease.METAVAR, help='Easing function to use for character movement.') class-attribute instance-attribute

easing.EasingFunction : Easing function to use for character movement.

movement_speed = ArgField(cmd_name='--movement-speed', type_parser=argvalidators.PositiveFloat.type_parser, default=0.5, metavar=argvalidators.PositiveFloat.METAVAR, help='Speed of the characters.') class-attribute instance-attribute

float : Speed of the characters.

reverse_direction = ArgField(cmd_name='--reverse-direction', action='store_true', help='Reverse the direction of the characters.') class-attribute instance-attribute

bool : Reverse the direction of the characters.

get_effect_class() classmethod

Get the effect class associated with this configuration.

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

SlideIterator

Bases: BaseEffectIterator[SlideConfig]

Effect iterator for the Slide effect.

Source code in terminaltexteffects/effects/effect_slide.py 
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class SlideIterator(BaseEffectIterator[SlideConfig]):
    """Effect iterator for the Slide effect."""

    def __init__(self, effect: Slide) -> None:
        """Initialize the Slide effect iterator."""
        super().__init__(effect)
        self.pending_chars: list[EffectCharacter] = []
        self.pending_groups: list[list[EffectCharacter]] = []
        self.character_final_color_map: dict[EffectCharacter, Color] = {}
        self.build()

    def build(self) -> None:  # noqa: PLR0915
        """Build 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]

        groups: list[list[EffectCharacter]] = []
        if self.config.grouping == "row":
            groups = self.terminal.get_characters_grouped(self.terminal.CharacterGroup.ROW_TOP_TO_BOTTOM)
        elif self.config.grouping == "column":
            groups = self.terminal.get_characters_grouped(self.terminal.CharacterGroup.COLUMN_LEFT_TO_RIGHT)
        elif self.config.grouping == "diagonal":
            groups = self.terminal.get_characters_grouped(
                self.terminal.CharacterGroup.DIAGONAL_TOP_LEFT_TO_BOTTOM_RIGHT,
            )
        for group in groups:
            for character in group:
                input_path = character.motion.new_path(
                    path_id="input_path",
                    speed=self.config.movement_speed,
                    ease=self.config.movement_easing,
                )
                input_path.new_waypoint(character.input_coord)

        for group_index, group in enumerate(groups):
            if self.config.grouping == "row":
                if self.config.merge and group_index % 2 == 0:
                    starting_column = self.terminal.canvas.right + 1
                else:
                    groups[group_index] = groups[group_index][::-1]
                    starting_column = self.terminal.canvas.left - 1
                if self.config.reverse_direction and not self.config.merge:
                    groups[group_index] = groups[group_index][::-1]
                    starting_column = self.terminal.canvas.right + 1
                for character in groups[group_index]:
                    character.motion.set_coordinate(geometry.Coord(starting_column, character.input_coord.row))
            elif self.config.grouping == "column":
                if self.config.merge and group_index % 2 == 0:
                    starting_row = self.terminal.canvas.bottom - 1
                else:
                    groups[group_index] = groups[group_index][::-1]
                    starting_row = self.terminal.canvas.top + 1
                if self.config.reverse_direction and not self.config.merge:
                    groups[group_index] = groups[group_index][::-1]
                    starting_row = self.terminal.canvas.bottom - 1
                for character in groups[group_index]:
                    character.motion.set_coordinate(geometry.Coord(character.input_coord.column, starting_row))
            if self.config.grouping == "diagonal":
                distance_from_outside_bottom = group[-1].input_coord.row - (self.terminal.canvas.bottom - 1)
                starting_coord = geometry.Coord(
                    group[-1].input_coord.column - distance_from_outside_bottom,
                    group[-1].input_coord.row - distance_from_outside_bottom,
                )
                if self.config.merge and group_index % 2 == 0:
                    groups[group_index] = groups[group_index][::-1]
                    distance_from_outside = (self.terminal.canvas.top + 1) - group[0].input_coord.row
                    starting_coord = geometry.Coord(
                        group[0].input_coord.column + distance_from_outside,
                        group[0].input_coord.row + distance_from_outside,
                    )
                if self.config.reverse_direction and not self.config.merge:
                    groups[group_index] = groups[group_index][::-1]
                    distance_from_outside = (self.terminal.canvas.top + 1) - group[0].input_coord.row
                    starting_coord = geometry.Coord(
                        group[0].input_coord.column + distance_from_outside,
                        group[0].input_coord.row + distance_from_outside,
                    )

                for character in groups[group_index]:
                    character.motion.set_coordinate(starting_coord)
            for character in group:
                gradient_scn = character.animation.new_scene()
                char_gradient = Gradient(
                    self.config.final_gradient_stops[0],
                    self.character_final_color_map[character],
                    steps=10,
                )
                gradient_scn.apply_gradient_to_symbols(
                    character.input_symbol,
                    self.config.final_gradient_frames,
                    fg_gradient=char_gradient,
                )
                character.animation.activate_scene(gradient_scn)

        self.pending_groups = groups
        self._active_groups: list[list[EffectCharacter]] = []
        self._current_gap = 0

    def __next__(self) -> str:
        """Return the next frame in the animation."""
        if self.pending_groups or self.active_characters or self._active_groups:
            if self._current_gap == self.config.gap and self.pending_groups:
                self._active_groups.append(self.pending_groups.pop(0))
                self._current_gap = 0
            elif self.pending_groups:
                self._current_gap += 1
            for group in self._active_groups:
                if group:
                    next_char = group.pop(0)
                    self.terminal.set_character_visibility(next_char, is_visible=True)
                    next_char.motion.activate_path(next_char.motion.paths["input_path"])
                    self.active_characters.add(next_char)
            self._active_groups = [group for group in self._active_groups if group]
            self.update()
            return self.frame
        raise StopIteration

__init__(effect)

Initialize the Slide effect iterator.

Source code in terminaltexteffects/effects/effect_slide.py 
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def __init__(self, effect: Slide) -> None:
    """Initialize the Slide effect iterator."""
    super().__init__(effect)
    self.pending_chars: list[EffectCharacter] = []
    self.pending_groups: list[list[EffectCharacter]] = []
    self.character_final_color_map: dict[EffectCharacter, Color] = {}
    self.build()

__next__()

Return the next frame in the animation.

Source code in terminaltexteffects/effects/effect_slide.py 
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def __next__(self) -> str:
    """Return the next frame in the animation."""
    if self.pending_groups or self.active_characters or self._active_groups:
        if self._current_gap == self.config.gap and self.pending_groups:
            self._active_groups.append(self.pending_groups.pop(0))
            self._current_gap = 0
        elif self.pending_groups:
            self._current_gap += 1
        for group in self._active_groups:
            if group:
                next_char = group.pop(0)
                self.terminal.set_character_visibility(next_char, is_visible=True)
                next_char.motion.activate_path(next_char.motion.paths["input_path"])
                self.active_characters.add(next_char)
        self._active_groups = [group for group in self._active_groups if group]
        self.update()
        return self.frame
    raise StopIteration

build()

Build the effect.

Source code in terminaltexteffects/effects/effect_slide.py 
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def build(self) -> None:  # noqa: PLR0915
    """Build 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]

    groups: list[list[EffectCharacter]] = []
    if self.config.grouping == "row":
        groups = self.terminal.get_characters_grouped(self.terminal.CharacterGroup.ROW_TOP_TO_BOTTOM)
    elif self.config.grouping == "column":
        groups = self.terminal.get_characters_grouped(self.terminal.CharacterGroup.COLUMN_LEFT_TO_RIGHT)
    elif self.config.grouping == "diagonal":
        groups = self.terminal.get_characters_grouped(
            self.terminal.CharacterGroup.DIAGONAL_TOP_LEFT_TO_BOTTOM_RIGHT,
        )
    for group in groups:
        for character in group:
            input_path = character.motion.new_path(
                path_id="input_path",
                speed=self.config.movement_speed,
                ease=self.config.movement_easing,
            )
            input_path.new_waypoint(character.input_coord)

    for group_index, group in enumerate(groups):
        if self.config.grouping == "row":
            if self.config.merge and group_index % 2 == 0:
                starting_column = self.terminal.canvas.right + 1
            else:
                groups[group_index] = groups[group_index][::-1]
                starting_column = self.terminal.canvas.left - 1
            if self.config.reverse_direction and not self.config.merge:
                groups[group_index] = groups[group_index][::-1]
                starting_column = self.terminal.canvas.right + 1
            for character in groups[group_index]:
                character.motion.set_coordinate(geometry.Coord(starting_column, character.input_coord.row))
        elif self.config.grouping == "column":
            if self.config.merge and group_index % 2 == 0:
                starting_row = self.terminal.canvas.bottom - 1
            else:
                groups[group_index] = groups[group_index][::-1]
                starting_row = self.terminal.canvas.top + 1
            if self.config.reverse_direction and not self.config.merge:
                groups[group_index] = groups[group_index][::-1]
                starting_row = self.terminal.canvas.bottom - 1
            for character in groups[group_index]:
                character.motion.set_coordinate(geometry.Coord(character.input_coord.column, starting_row))
        if self.config.grouping == "diagonal":
            distance_from_outside_bottom = group[-1].input_coord.row - (self.terminal.canvas.bottom - 1)
            starting_coord = geometry.Coord(
                group[-1].input_coord.column - distance_from_outside_bottom,
                group[-1].input_coord.row - distance_from_outside_bottom,
            )
            if self.config.merge and group_index % 2 == 0:
                groups[group_index] = groups[group_index][::-1]
                distance_from_outside = (self.terminal.canvas.top + 1) - group[0].input_coord.row
                starting_coord = geometry.Coord(
                    group[0].input_coord.column + distance_from_outside,
                    group[0].input_coord.row + distance_from_outside,
                )
            if self.config.reverse_direction and not self.config.merge:
                groups[group_index] = groups[group_index][::-1]
                distance_from_outside = (self.terminal.canvas.top + 1) - group[0].input_coord.row
                starting_coord = geometry.Coord(
                    group[0].input_coord.column + distance_from_outside,
                    group[0].input_coord.row + distance_from_outside,
                )

            for character in groups[group_index]:
                character.motion.set_coordinate(starting_coord)
        for character in group:
            gradient_scn = character.animation.new_scene()
            char_gradient = Gradient(
                self.config.final_gradient_stops[0],
                self.character_final_color_map[character],
                steps=10,
            )
            gradient_scn.apply_gradient_to_symbols(
                character.input_symbol,
                self.config.final_gradient_frames,
                fg_gradient=char_gradient,
            )
            character.animation.activate_scene(gradient_scn)

    self.pending_groups = groups
    self._active_groups: list[list[EffectCharacter]] = []
    self._current_gap = 0

get_effect_and_args()

Get the effect class and its configuration class.

Source code in terminaltexteffects/effects/effect_slide.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 Slide, SlideConfig