Turn

Turn function rotates a frame or selected part of it about the specified fulcrum. The function accepts all avisynth+ supported RGB, YUY2 and Planar YUV in all bit dephs. This is thread safe. MT_NICE_FILTER . It displays the the rotated disc visible in specified rectangule. 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. it checks whether atleast a part of the rotating area is within frame. 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.

Details of parameters

Description	Name	Type	Limits	Default
Input clip		clip		none
clip for background	bg	clip	if not specified original clip is used as backgound	none.
(initial) radius of rotating disc	r	integer	more than 0	half of diagonal of frame
(initial) angle of rotation in degrees	angle	float	no limit. +ve clockwise	45
(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 type	q	integer	1 : nearest neighbour, 2 : bilinear, 3 : Bicubic 4 :Lanczos 6x6 point	3 (Bicubic)
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
Location precision to be maintained	p	integer	2 to 10	4
Are coordinates normalized?	norm	boolean	true, false	false

Usage examples

im1 = imagereader(................).converttoRGB24()
r1=Turn(im1,q = 0, angle = 240, eangle = 4800, lx = 100, rx = 400, ty = 200, by = 250)
r2=Turn(im1,q = 2, angle = 240,  x = 210.4, y = 188.6, r=140)