Text style is specified by the string which may contain: color id characters ‘wkrgbcymhRGBCYMHW’ (see Color styles), and font style (‘ribwou’) and/or alignment (‘LRC’) specifications. At this, font style and alignment begin after the separator ‘:’. For example, ‘r:iCb’ sets the bold (‘b’) italic (‘i’) font text aligned at the center (‘C’) and with red color (‘r’). Starting from MathGL v.2.3, you can set not single color for whole text, but use color gradient for printed text (see Color scheme).
The font styles are: ‘r’ – roman (or regular) font, ‘i’ – italic style, ‘b’ – bold style. By default roman roman font is used. The align types are: ‘L’ – align left (default), ‘C’ – align center, ‘R’ – align right, ‘T’ – align under, ‘V’ – align center vertical. Additional font effects are: ‘w’ – wired, ‘o’ – over-lined, ‘u’ – underlined.
Also a parsing of the LaTeX-like syntax is provided. There are commands for the font style changing inside the string (for example, use \b for bold font): \a or \overline – over-lined, \b or \textbf – bold, \i or \textit – italic, \r or \textrm – roman (disable bold and italic attributes), \u or \underline – underlined, \w or \wire – wired, \big – bigger size, @ – smaller size. The lower and upper indexes are specified by ‘_’ and ‘^’ symbols. At this the changed font style is applied only on next symbol or symbols in braces {}. The text in braces {} are treated as single symbol that allow one to print the index of index. For example, compare the strings ‘sin (x^{2^3})’ and ‘sin (x^2^3)’. You may also change text color inside string by command #? or by \color? where ‘?’ is symbolic id of the color (see Color styles). For example, words ‘blue’ and ‘red’ will be colored in the string ‘#b{blue} and \colorr{red} text’. The most of functions understand the newline symbol ‘\n’ and allows one to print multi-line text. Finally, you can use arbitrary (if it was defined in font-face) UTF codes by command \utf0x????. For example, \utf0x3b1 will produce
α symbol.
The most of commands for special TeX or AMSTeX symbols, the commands for font style changing (\textrm, \textbf, \textit, \textsc, \overline, \underline), accents (\hat, \tilde, \dot, \ddot, \acute, \check, \grave, \bar, \breve) and roots (\sqrt, \sqrt3, \sqrt4) are recognized. The full list contain approximately 2000 commands. Note that first space symbol after the command is ignored, but second one is printed as normal symbol (space). For example, the following strings produce the same result \tilde a: ‘\tilde{a}’; ‘\tilde a’; ‘\tilde{}a’.
In particular, the Greek letters are recognizable special symbols: α – \alpha, β – \beta, γ – \gamma, δ – \delta, ε – \epsilon, η – \eta, ι – \iota, χ – \chi, κ – \kappa, λ – \lambda, μ – \mu, ν – \nu, o – \o, ω – \omega, ϕ – \phi, π – \pi, ψ – \psi, ρ – \rho, σ – \sigma, θ – \theta, τ – \tau, υ – \upsilon, ξ – \xi, ζ – \zeta, ς – \varsigma, ɛ – \varepsilon, ϑ – \vartheta, φ – \varphi, ϰ – \varkappa; A – \Alpha, B – \Beta, Γ – \Gamma, Δ – \Delta, E – \Epsilon, H – \Eta, I – \Iota, C – \Chi, K – \Kappa, Λ – \Lambda, M – \Mu, N – \Nu, O – \O, Ω – \Omega, Φ – \Phi, Π – \Pi, Ψ – \Psi, R – \Rho, Σ – \Sigma, Θ – \Theta, T – \Tau, Υ – \Upsilon, Ξ – \Xi, Z – \Zeta.The small part of most common special TeX symbols are: ∠ – \angle, ⋅ – \cdot, ♣ – \clubsuit, ✓ – \checkmark, ∪ – \cup, ∩ – \cap, ♢ – \diamondsuit, ◇ – \diamond, ÷ – \div, ↓ – \downarrow, † – \dag, ‡ – \ddag, ≡ – \equiv, ∃ – \exists, ⌢ – \frown, ♭ – \flat, ≥ – \ge, ≥ – \geq, ≧ – \geqq, ← – \gets, ♡ – \heartsuit, ∞ – \infty, ∫ – \int, \Int, ℑ – \Im, ♢ – \lozenge, ⟨ – \langle, ≤ – \le, ≤ – \leq, ≦ – \leqq, ← – \leftarrow, ∓ – \mp, ∇ – \nabla, ≠ – \ne, ≠ – \neq, ♮ – \natural, ∮ – \oint, ⊙ – \odot, ⊕ – \oplus, ∂ – \partial, ∥ – \parallel, ⊥ –\perp, ± – \pm, ∝ – \propto, ∏ – \prod, ℜ – \Re, → – \rightarrow, ⟩ – \rangle, ♠ – \spadesuit, ~ – \sim, ⌣ – \smile, ⊂ – \subset, ⊃ – \supset, √ – \sqrt or \surd, § – \S, ♯ – \sharp, ∑ – \sum, × – \times, → – \to, ∴ – \therefore, ↑ – \uparrow, ℘ – \wp.
The font size can be defined explicitly (if size>0) or relatively to a base font size as |size|*FontSize (if size<0). The value size=0 specifies that the string will not be printed. The base font size is measured in internal “MathGL” units. Special functions SetFontSizePT(), SetFontSizeCM(), SetFontSizeIN() (see Font settings) allow one to set it in more “common” variables for a given dpi value of the picture.