https://bugs.freedesktop.org/show_bug.cgi?id=50998
Bug #: 50998
Summary: : Suggestion: "coil" shape
Classification: Unclassified
Product: LibreOffice
Version: unspecified
Platform: Other
OS/Version: All
Status: UNCONFIRMED
Status Whiteboard: BSA
Severity: normal
Priority: medium
Component: Drawing
AssignedTo: [email protected]
ReportedBy: [email protected]
There's no easy way to draw springs, coils, sinusoids, etc. The only way to do
this is with a bézier curve (too much precision required), hand-drawn (even
more), or with ellipse arcs (and everyone knows how ugly a "sinusoid" drawn
with half ellipses is).
It might be a good idea to include a line shape that allowed to draw
* a sinusoid
* a "coil" or "spring"
* a cycloid or trochoid (I doubt anyone actually wants to draw this, but it
would be a particular case of "coil")
The parametric formula (for a horizontal coil) is
{ x = t * L/2pi + e*H/2 * cos(t+t0)
{ y = H/2 * sin(t+t0)
{ for t = 0 ... W / (L/2pi)
where H is the height (amplitude), W the width (length), L the distance between
loops (wavelength), e the eccentricity (e=0: sinusoid; e=1: trocoid; 0<e<1:
another coil-shaped line), and t0 the initial phase.
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