class

Opal::UI::EquationViewer

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

Mathematical equation viewer and interactive 2D function grapher. Features 2D Unicode mathematical typesetting (fractions, integrals, radicals, summations) and interactive Cartesian graphing f(x) with braille sub-pixel rendering, zoom, and pan.

Constants

SUBSCRIPTS = {'0' => '₀', '1' => '₁', '2' => '₂', '3' => '₃', '4' => '₄', '5' => '₅', '6' => '₆', '7' => '₇', '8' => '₈', '9' => '₉', '+' => '₊', '-' => '₋', '=' => '₌', '(' => '₍', ')' => '₎', 'a' => 'ₐ', 'e' => 'ₑ', 'i' => 'ᵢ', 'j' => 'ⱼ', 'k' => 'ₖ', 'n' => 'ₙ', 'x' => 'ₓ'}

SUPERSCRIPTS = {'0' => '⁰', '1' => '¹', '2' => '²', '3' => '³', '4' => '⁴', '5' => '⁵', '6' => '⁶', '7' => '⁷', '8' => '⁸', '9' => '⁹', '+' => '⁺', '-' => '⁻', '=' => '⁼', '(' => '⁽', ')' => '⁾', 'n' => 'ⁿ', 'i' => 'ⁱ', 'x' => 'ˣ', 'y' => 'ʸ'}

Unicode character map for superscripts and subscripts

Constructors

new(function_title : String = "f(x) = sin(x)", x_min : Float64 = -5.0, x_max : Float64 = 5.0, y_min : Float64 = -3.0, y_max : Float64 = 3.0, width : Int32 = 42, height : Int32 = 16, function : Proc(Float64, Float64) | Nil = nil)

new(function_title : String = "f(x) = sin(x)", x_min : Float64 = -5.0, x_max : Float64 = 5.0, y_min : Float64 = -3.0, y_max : Float64 = 3.0, width : Int32 = 42, height : Int32 = 16, &block : Float64 -> Float64)

Class methods

format_super_sub(expr : String) : String

Converts a regular string with ^(exp) or _(sub) into Unicode super/subscripts

sqrt_text(inner : String) : String

Formats a square root: √(expr) with Unicode overbar

Instance methods

add_fraction(num : String, den : String) : Nil

Adds a fraction node

add_integral(lower : String, upper : String, integrand : String) : Nil

Adds an integral node

add_text(text : String) : Nil

Adds a text node

axis_color

axis_color=(axis_color : Color)

border_color

border_color=(border_color : Color)

curve_color

Colors

curve_color=(curve_color : Color)

Colors

formula_color

formula_color=(formula_color : Color)

function

Function to graph: receives float x and returns float y = f(x)

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

Function to graph: receives float x and returns float y = f(x)

function_title

function_title=(function_title : String)

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.

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)

math_nodes

math_nodes=(math_nodes : Array(MathNode))

pan(dx_pct : Float64, dy_pct : Float64) : Nil

Pans viewport

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

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

render(buffer : Buffer) : Nil

show_formula=(show_formula : Bool)

show_formula?

show_graph=(show_graph : Bool)

Display settings

show_graph?

Display settings

width

width=(width : Int32)

x_max

x_max=(x_max : Float64)

x_min

Viewport bounds

x_min=(x_min : Float64)

Viewport bounds

y_max

y_max=(y_max : Float64)

y_min

y_min=(y_min : Float64)

zoom(factor : Float64) : Nil

Zooms in/out

Nested types