class

Opal::UI::CurveEditor

Inherits Opal::UI::Control < Opal::UI::InputHookable < Opal::UI::Element < Opal::UI::Themable < Reference < Object

Interactive Bézier Curve & Easing Editor. Features 2x4 sub-pixel Unicode Braille plotting, draggable P1/P2 control handles, CSS cubic-bezier output, standard presets, and real-time physics easing preview.

Constants

PRESETS = {"linear" => {0.0, 0.0, 1.0, 1.0}, "ease" => {0.25, 0.1, 0.25, 1.0}, "ease_in" => {0.42, 0.0, 1.0, 1.0}, "ease_out" => {0.0, 0.0, 0.58, 1.0}, "ease_in_out" => {0.42, 0.0, 0.58, 1.0}, "ease_in_back" => {0.36, 0.0, 0.66, -0.56}, "ease_out_back" => {0.34, 1.56, 0.64, 1.0}}

Presets

Constructors

new(p1_x : Float64 = 0.42, p1_y : Float64 = 0.0, p2_x : Float64 = 0.58, p2_y : Float64 = 1.0, width : Int32 = 36, height : Int32 = 16)

Instance methods

active_handle

Active handle being manipulated: 1 for P1, 2 for P2

active_handle=(active_handle : Int32)

Active handle being manipulated: 1 for P1, 2 for P2

anim_progress

anim_progress=(anim_progress : Float64)

border_color

border_color=(border_color : Color)

curve_color

Visual styling

curve_color=(curve_color : Color)

Visual styling

evaluate_easing(x : Float64) : Float64

Solves for y given x in [0.0..1.0] using bisection (approximate inversion for animation easing)

grid_color

grid_color=(grid_color : Color)

handle_key(key : Terminal::KeyEvent) : Bool

Default key event handler. Override in subclasses if not using @default_input_proc.

handle_mouse(event : Terminal::MouseEvent) : Bool

Default mouse event handler. Override in subclasses if not using @default_input_proc.

handle_p1_color

handle_p1_color=(handle_p1_color : Color)

handle_p2_color

handle_p2_color=(handle_p2_color : Color)

height

height=(height : Int32)

last_h

last_h=(last_h : Int32)

last_w

last_w=(last_w : Int32)

last_x

last_x=(last_x : Int32)

last_y

last_y=(last_y : Int32)

on_change

Callbacks

on_change=(on_change : Proc(Float64, Float64, Float64, Float64, Nil) | Nil)

Callbacks

p1_x

p1_x=(p1_x : Float64)

p1_y

p1_y=(p1_y : Float64)

p2_x

p2_x=(p2_x : Float64)

p2_y

p2_y=(p2_y : Float64)

preferred_size(available_w : Int32, available_h : Int32) : Tuple(Int32, Int32)

preset(name : String) : Nil

Applies a named preset (e.g. "ease_in_out", "ease", "linear")

render(buffer : Buffer, x : Int32, y : Int32, width : Int32, height : Int32) : Nil

render(buffer : Buffer) : Nil

sample_bezier(t : Float64) : Tuple(Float64, Float64)

Evaluates cubic Bézier parametric coordinate (bx, by) at parameter t in [0.0..1.0]

show_ball_track

show_ball_track=(show_ball_track : Bool)

tick_anim(delta : Float64 = 0.05) : Nil

Increments animation preview progress

to_css

Generates CSS cubic-bezier string

width

width=(width : Int32)