0.1 Media representation in processing  (Page 3/6)

Tinging an image

An image can be tinged with a color and its transparency can be set by assigning a given value to the alpha channel. Forthis purpose, the function tint() can be used. For example, a blue tone can be assigned to the inlaidimage of [link] by just preceding the second image() command with tint(0, 153, 204, 126) .

Translations, rotations, and scale transformations

Representing points and vectors

homogeneous coordinates

quadruples of numbers, where the first triple is to be read in the X-Y-Z space, while thefourth number indicates a vector if it takes value 0, or a point if it takes value 1.

Translations

Rotations

0 0

Scale transformations

Typographic elements

Every tool or language for media manipulation gives the opportunity towork with written words and with their fundamental visual elements: typographic characters.

The aspect of a type has two main components: font and size.

Processing has the class PFont and the methods loadFont() (to load a font and assign it to an object of the PFont class) and textFont() (to activate a font with a specific size). In order to load afont, this has to be pre-loaded into the directory data of the current sketch. The tool Create Font , accessible from the Tools menu in Processing, creates the bitmaps of the characters that theprogrammer intends to use. The file with the bitmaps is put in the data directory. After these preliminary operations, the font can be used to write some text, using thefunction text() . With this function, a string of characters can be put in the 2D or 3D space, possiblyinserting it within a rectangular box. The alignment of characters in the box is governed by the function textAlign() . In the default configuration, the written text can be spatially transformed like any otherobject. The color of characters can be set with the usual fill() , like for any other graphic object.