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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) .
translate() moves an object in the image
window. It takes two or three parameters, being thedisplacements along the directions
,
(and
), respectively.
rotate() is used to rotate objects in the image
window. This is obtained by (left) multiplying thecoordinates of each pixel of the object by a rotation
matrix. Rotations are always specified around the top leftcorner of the window (
coordinate). Translations can be used to move the
rotation axis to other points. Rotation angles are specifiedin radians. Recall that
. For example, insert the rotation
rotate(PI/3) before the second
image() command in
[link] . In three dimensions, we can use elementary rotations
around the coordinate axes
rotateX() ,
rotateY() , e
rotateZ() .
scale() allows to expand or contract an object by
multiplication of its point coordinates by a constant. When itis invoked with two or three parameters, different scalings can
be applied to the three axes.
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.
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