Strokes Skeletons And Envelopes

The constant thickness stroke is still the basic drawing primitive provided by most commercially available vector based drawing packages 34,39 . To create pictures like figures 2, 3, 17 and 19 with these packages usually involves scanning in an original copy (which has already been created on paper) or tracing out its outlines manually or automatically. Indeed, many impressive illustrations that fill the pages of manuals of many market-leading packages are there to demonstrate the package's...

Rendering a Recursive Stroke

Rendering a recursive stroke explicitly by determining the resultant geometry is in general impossible. Since a recursive stroke is equivalent to an IFS (Iterated Function System) code (with a condensation set if objects other than itself are present in the definition) 3,4,5,6 , the attractor is often a fractal with a fractal dimension less than 2. We therefore have to resort to one of the approximation methods for rendering these fractals. The Escape Time Algorithm 4 would result in a clean...

General Drawing Applications

We anticipate that skeletal strokes would have considerable impact on many drawing applications in fashion design where stylish bold strokes are often used in interior design where pseudo-3D strokes representing furniture and architectural objects can be laid out with ease in dynamic clip-arts which can deform dramatically beyond the limits of stretching, shrinking, shearing, twisting and bending. If implemented in windowing system kernels or page description languages like PostScript, the...

Animation with Skeletal Draw

Animation takes full advantage of the picture and deformation abstraction capability provided by skeletal strokes. The Skeletal Draw program has also been built with facilities to generate animation sequences. Traditional key-frame technique is used by Skeletal Draw. To create the key-frames, the user directly manipulates the characters in the scene. The system then calculates the in-betweens by interpolating Catmull-Rom splines. After the keyframes have been laid out, the program can do a...