Spinner

Author V. C. Mohan
Date Aug 2014
EMail: mohanvc

Spinner plugin for Avisynth 2.5+ version, is free to use under GPL 3 licence.

Spinner plugin rotates a frame or selected part of it about the given axis coordinates in floating point precision. It displays the common area of the rotated disc and a specified rectangular area. Thus a thin strip can be rotated about an axis situated outside of it (appears as cartwheeling). Either the original clip or a different clip can be used as background or a chosen color can be painted in areas not undergoing rotation.

Quality of processing q can be Nearest neighbour, bilinear,Lagrange and Lanczos interpolations. Location precision p in quantiles can be specified.

Facility to linearly vary over the clip most of the parameters is provided. The variation will be from starting input frame to ending input frame. If opted it checks whether the axis and the rotating disc are outside the frame. and whether atleast a part of the rectangular strip to be shown cartwheeling is within the rotating disc. Eventhough a part of rotating disc can be located outside frame by choosing the axis coordinates beyond frame boundary, it will not make much sense as parts of the display will go blank. However the radius of disc can be choosen larger to ensure the full frame is rotated. In that case specify check as false

This plugin works in all avisynth version supported color spaces.

Details of parameters
Description	Name	Type	Limits	Default
Input clip		clip		none
(initial) radius of rotating disc	r	integer	more than 0	if check is true half of smaller side of frame, otherwise half of diagonal of frame
(initial) angle of rotation in degrees	angle	float	no limit. +ve clockwise	90
(initial) x coordinate of rotation axis	x	float	atleast part of disc should be in frame	width/2
(initial) y coordinate of rotation axis	y	float	atleast part of disc should be in frame	height/2
interpolation quality	q	integer	0 : nearest neighbour, 1 : bilinear, 2 :Lagrange 4 point 3 : Lagrange 6 point, 4 : Lanczos 4 point, 5 : Lanczos 6 point	5{lanczos 6 pt)
Is background clip frame (original or different) or colored	bg	boolean	true for clip frame, false for painting color	true
background color if background coloring is opted	color	integer	in RRGGBB format	0
clip for background	tclip	clip	if not specified and bg is true then original clip is used as backgound	none.
end radius of rotating disc	er	integer	more than 0	r
end angle of rotation in degrees	eangle	float	no limit. -ve clockwise	angle
end x coordinate of rotation axis	ex	float	atleast part of disc should be in frame	x
end y coordinate of rotation axis	ey	float	atleast part of disc should be in frame	y
(initial) left x coordinate of rctangle to display	lx	integer	should be in frame	0
(initial) right x coordinate of rectangle to display	rx	integer	should be in frame	width - 1
(initial) top y coordinate of rctangle to display	ty	integer	should be in frame	0
(initial) bottom y coordinate of rectangle to display	by	integer	should be in frame	height - 1
end left x coordinate of rctangle to display	elx	integer	should be in frame	lx
end right x coordinate of rectangle to display	rx	integer	should be in frame	rx
end top y coordinate of rctangle to display	ety	integer	should be in frame	ty
end bottom y coordinate of rectangle to display	eby	integer	should be in frame	by
location percentile accuracy	p	integer	should be 5 to 100	50
do you need a error message if this rectangle is outside rotation disc and if even part of disc is out of frame?	check	boolean	true for yes, false for do not check	true

Usage examples

#Spinner()
im1 = imagereader("E:\images\canyon.jpg", end = 21).converttoRGB24()
r1=Spinner(im1,q = 0, angle = 240, eangle = 4800, lx = 100, rx = 400, ty = 200, by = 250, check = false)
r2=Spinner(im1,q = 2, angle = 240,  x = 210.4, y = 188.6, r=140)

Images with above script.
r1

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