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C-krivulje

magistrsko delo
Authors: Čarman, Mateja;
Abstract

C-Bézierjeve krivulje predstavljajo razširitev kubičnih Bézierjevih krivulj. Definirane so kot linearna kombinacija baznih funkcij $sin t$, $cos t$ in 1. V definiciji nastopa še parameter $alpha$, ki dodatno vpliva na obliko krivulje. C-Bézierjeve krivulje v limitnem primeru $alpha to 0$ konvergirajo h kubičnim Bézierjevim krivuljam. Obe družini krivulj se zaradi številnih lepih geometrijskih lastnosti uporabljata v računalniško podprtem geometrijskem oblikovanju. V delu na kratko predstavimo še sorodne Fergusonove krivulje in njihovo razširitev na C-krivulje. Glavna prednost C-Bézierjevih krivulj je ta, da lahko z njimi eksaktno narišemo krožni lok in lok elipse. V delu je podana geometrijska karakterizacija krivulje, ki predstavlja krožni lok in polovico loka elipse. Na koncu predstavimo še Bézierjeve in C-Bézierjeve krivulje kot PH krivulje, ki se uporabljajo v programih CNC strojev.

The C-Bézier curves represent the extension of the cubic Bézier curves. They are defined as a linear combination of the basis functions $sin t$, $cos t$ and 1. The definition also includes a parameter $alpha$ that additionally affects the shape of the curve. In the limit case $alpha to 0$, the C-Bézier curves converge to Cubic Béziers curves. Both families of curves are used in computer aided geometric design because of their numerous beautiful geometric properties. In this work we briefly present the related Ferguson curves and their extension to the C-curves. The main advantage of the C-Bézier curves is that we can accurately plot the circular arc and arc ellipse. The geometric characterization of the curve, which represents a circular arc and a half of the arc of the ellipse, is also given in the paper. Finally, we present Bézier and C-Bézier curves as PH curves used in CNC machines.

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Keywords

interpolacija s krivuljami, info:eu-repo/classification/udc/519.6, gladkost, algoritmi za aproksimacijo funkcij, computer aided design, curve fitting, računalniško podprto oblikovanje, smoothing, algorithms for functional approximation

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
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