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43 lines
1.6 KiB
43 lines
1.6 KiB
Wet & Sticky
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The Chalk Wet & Sticky module is derived from the seminal dissertation
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"Wet & Stick: A Novel Model for Computer-Based Painting" by Malcom Tunde
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Cockshott, and the implementation of that model by Tunde Cockshott,
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David England and Kevin Waite. The complete source code to the first
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implementation is included in the module_ws/ws and is released under
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the terms of the GPL.
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The W&S model is implemented in the following components:
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* A color strategy
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* A paint op
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* A filter
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The color strategy implements the canvas; the paint op implements the
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application of paint and the filter implements the paint simulation
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engine.
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This system adds the following interesting capabilities to Chalk:
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* Extending the tool options dialog with a widget describing the
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paint op.
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* Extending the paint op class with properties beyond opacity and
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color to a more generic structure with can contain the many different
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properties needed by more complex color models to calculate bitBlt's.
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All the ordinary paint ops still work, but they act as if they are
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applying dry, thin paint, conforming to Cockshott's analysis of the
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Shoup model (which Chalk implemented in the first instance) as a subset
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of the W&S model.
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* Adding continuously running filters (either in separate threads or
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called by a timer) to a particular paint device.
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* Adding a new way to mix colour; the older colour selection widgets
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still work, but only give completely dry, infinitely thin paint.
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* Creating a layer with a fill of 'substrate' cells -- i.e, filling not just
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with colour, but also with certain calculated amounts of height,
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gravity and absorbency.
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