MathConstants class

Centralized typesetting constants for the rendering engine.

Design rationale:

• Consolidates all magic numbers, eliminating hardcoded ratios in various Measurers.
• Naming follows TeX typesetting terminology (sigma, xi, mu) for easy comparison with the TeXbook.
• All values are ratio coefficients of fontSize; multiply by fontSizePx to get pixel values.

Reference: TeXbook Appendix G and KaTeX font metrics.

Properties

hashCode → int

The hash code for this object.

no setter, inherited

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

Methods

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

toString() → String

A string representation of this object.

inherited

Operators

operator ==(Object other) → bool

The equality operator.

inherited

Constants

bigOpLimitScale → const double

Limit font size scaling factor

bigOpNamedMinWeight → const int

Named operator minimum fontWeight

bigOpSymbolBaseWeight → const int

Symbol operator normal fontWeight

bigOpSymbolMinWeight → const int

Symbol operator minimum fontWeight

bigOpVerticalScaleWeightReduction → const int

Extra weight reduction after vertical stretch (maximum value)

bigOpWidthOverflowFactor → const double

Operator width overflow protection factor

binomialChildScale → const double

Binomial child scaling factor

binomialGap → const double

Binomial vertical gap / fontSize

boxedBorderWidthDp → const double

Boxed border width (dp)

boxedPadding → const double

Boxed inner padding / fontSize

canvasHorizontalPadding → const double

Canvas horizontal padding / fontSize

canvasVerticalPadding → const double

Canvas vertical padding / fontSize

delimiterPadding → const double

Delimiter vertical padding / fontSize

extensibleArrowHeadSizeDp → const double

Arrow head size (dp)

extensibleArrowMinLengthDp → const double

Arrow minimum length (dp)

extensibleArrowPaddingDp → const double

Arrow horizontal padding (dp)

extensibleArrowStrokeDp → const double

Arrow stroke thickness (dp)

extensibleArrowTextGap → const double

Gap between arrow and scripts / fontSize (KaTeX xArrow: 2mu = 0.111em)

fractionChildScale → const double

Fraction child (numerator/denominator) font size reduction factor

fractionGap → const double

Gap between fraction rule and numerator/denominator / fontSize

fractionRuleInset → const double

Horizontal inset at both ends of the fraction rule / fontSize

fractionRuleThickness → const double

Fraction rule thickness / fontSize (ξ₈, default rule thickness)

integralFontScaleRatio → const double

Distribution ratio (0~1) of fontSize enlargement in mixed stretching. 0.5 means the square root of the total stretch is allocated to fontSize, and the square root to Canvas scale.

integralHeightHintOvershoot → const double

Overshoot coefficient implied by integral height

integralMinVerticalScale → const double

Integral symbol minimum vertical stretch multiplier

integralVisualWidth → const double

Integral symbol visual core width / fontSize

italicLeftOverhang → const double

Left italic overhang for specific first characters / fontSizePx

italicRightOverhangLower → const double

Lowercase right italic overhang / fontSizePx

italicRightOverhangOther → const double

Other characters right italic overhang / fontSizePx

italicRightOverhangUpper → const double

Uppercase right italic overhang / fontSizePx

lineSpacing → const double

Line spacing / fontSize

mathAxisHeightRatio → const double

Fallback ratio of math axis height to font size (used when dynamic calc fails)

matrixColumnSpacing → const double

Matrix column spacing / fontSize

matrixRowSpacing → const double

Matrix row spacing / fontSize

mediumSpace → const double

Medium space : = 4mu ≈ 0.222em

multlineRowSpacing → const double

Multline row spacing / fontSize

operatorRightGap → const double

Operator (sin/cos etc.) right gap / fontSize

quadSpace → const double

Quad space \quad = 18mu = 1em

radicalHookWidth → const double

Radical hook width / fontSize

radicalIndexOffset → const double

Radical index horizontal offset coefficient (relative to hookWidth)

radicalTopGapMultiplier → const double

Gap multiplier from top of radical content to the overline (relative to ruleThickness)

scriptKernDp → const double

Horizontal gap between script and base symbol (dp)

scriptMinGap → const double

Minimum gap between superscript and subscript / fontSize

scriptScale → const double

SCRIPT style font size scaling relative to TEXT/DISPLAY (σ₅)

scriptScriptScale → const double

SCRIPT_SCRIPT style font size scaling (σ₆)

stackScriptScale → const double

Stack vertical content font size scaling factor

stackVerticalGap → const double

Minimum vertical gap between Stack label and base box / fontSize

subscriptShift → const double

Subscript shift-down / fontSize (σ₁₆)

superscriptShift → const double

Superscript shift-up / fontSize (σ₁₃)

thickSpace → const double

Thick space ; = 5mu ≈ 0.278em

thinSpace → const double

Thin space , = 3mu ≈ 0.167em

wideAccentArrowGap → const double

Wide accent arrow gap / fontSize

wideAccentArrowHeight → const double

Wide accent line/arrow height / fontSize

wideAccentDefaultGap → const double

Wide accent default gap / fontSize

wideAccentDefaultHeight → const double

Wide accent default height / fontSize