blob: b1844466a521f879b9a089d0060f4930d9f3e015 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
|
Wet & Sticky
The Chalk Wet & Sticky module is derived from the seminal dissertation
"Wet & Stick: A Novel Model for Computer-Based Painting" by Malcom Tunde
Cockshott, and the implementation of that model by Tunde Cockshott,
David England and Kevin Waite. The complete source code to the first
implementation is included in the module_ws/ws and is released under
the terms of the GPL.
The W&S model is implemented in the following components:
* A color strategy
* A paint op
* A filter
The color strategy implements the canvas; the paint op implements the
application of paint and the filter implements the paint simulation
engine.
This system adds the following interesting capabilities to Chalk:
* Extending the tool options dialog with a widget describing the
paint op.
* Extending the paint op class with properties beyond opacity and
color to a more generic structure with can contain the many different
properties needed by more complex color models to calculate bitBlt's.
All the ordinary paint ops still work, but they act as if they are
applying dry, thin paint, conforming to Cockshott's analysis of the
Shoup model (which Chalk implemented in the first instance) as a subset
of the W&S model.
* Adding continuously running filters (either in separate threads or
called by a timer) to a particular paint device.
* Adding a new way to mix colour; the older colour selection widgets
still work, but only give completely dry, infinitely thin paint.
* Creating a layer with a fill of 'substrate' cells -- i.e, filling not just
with colour, but also with certain calculated amounts of height,
gravity and absorbency.
|
