zeGraph - Graphic object library

Graph




















Utility






Auxiliary

zeText

Use .new("text") to create the object. It uses zeFreetype to generate texture-mapped text. The image can be transfered to an array and later used for texture or rendered as points.

:font(object)

Sets the Freetype object to be used to generate text bitmap.

:fontsize(size)

Sets the font size to the specified number of pixels per inch. It should be called before calling the text() function.

:text(string)

Parses the string and use the results as the text content. The tags of <sym> and </sym> mark the number between them as the Unicode of a character; <sup> and </sup> marks a string as superscript; and <sub> and <sub> makrs a string as subscript. The <sym> and </sym> tags also recognize Greek characters by name. Multi-bytes characters (e.g., Japanese and Chinese) can be used if the font file supports them. The functions returns the image width and height.

:set{...}

Sets text properties with a Lua table. Valid key-value pairs in the Lua table are listed as follows.

Key	Value	Type	Remark
color	{r, g, b, a}	Numbers (0 to 1) in table	Sets the text color.
layout	{x0, y0, z0, x1, y1, z1, x2, y2, z2}	Numbers in table	Sets the plane on which the text will be drawn. The plane is determined by vectors from (x0,y0,z0) to (x1,y1,z1) and to (x2,y2,z2)
position	{x, y, z, hor, vert}	Numbers in table	Position the object at (x, y, z) on the x-y plane. If hor =0, center alignment horizontally; if hor > 0, right alignment horizontally; otherwise left alignment horizontally. If ver =0, center alignment vertically; if ver > 0, top alignment vertically; otherwise bottom alignment vertically.
enable	flag	Boolean	Enables or disables the object.

Greek Character Names

alpha:	eta:	nu:	tau:	Gamma:	Sigma:
beta:	theta:	xi:	upsilon:	Delta:	Phi:
gamma:	iota:	o:	phi:	Theta:	Psi:
delta:	kappa:	pi:	chi:	Lambda:	Omega:
epsilon:	lambda:	rho:	psi:	Xi:
zeta:	mu:	sigma:	omega:	Pi: