class Opal::UI::EquationViewer

• Opal::UI::EquationViewer
• Opal::UI::Control
• Opal::UI::Element
• Reference
• Object

Overview

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.

Defined in:

Constant Summary

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 Method Summary

• .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 Method Summary

• #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 : Color
• #axis_color=(axis_color : Color)
• #border_color : Color
• #border_color=(border_color : Color)
• #curve_color : Color

  Colors

• #curve_color=(curve_color : Color)

  Colors

• #formula_color : Color
• #formula_color=(formula_color : Color)
• #function : Proc(Float64, Float64) | Nil

  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 : String
• #function_title=(function_title : String)
• #grid_color : Color
• #grid_color=(grid_color : Color)
• #handle_key(key : Terminal::KeyEvent) : Bool

  Default key event handler.

• #handle_mouse(event : Terminal::MouseEvent) : Bool

  Default mouse event handler.

• #height : Int32
• #height=(height : Int32)
• #last_h : Int32
• #last_h=(last_h : Int32)
• #last_w : Int32
• #last_w=(last_w : Int32)
• #last_x : Int32
• #last_x=(last_x : Int32)
• #last_y : Int32
• #last_y=(last_y : Int32)
• #math_nodes : Array(MathNode)
• #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? : Bool
• #show_graph=(show_graph : Bool)

  Display settings

• #show_graph? : Bool

  Display settings

• #width : Int32
• #width=(width : Int32)
• #x_max : Float64
• #x_max=(x_max : Float64)
• #x_min : Float64

  Viewport bounds

• #x_min=(x_min : Float64)

  Viewport bounds

• #y_max : Float64
• #y_max=(y_max : Float64)
• #y_min : Float64
• #y_min=(y_min : Float64)
• #zoom(factor : Float64) : Nil

  Zooms in/out

Constructor Detail

Class Method Detail

Instance Method Detail