| help with cgDrawVectors [message #91191] |
Mon, 15 June 2015 08:31  |
g.nacarts
Messages: 148
Registered: November 2013
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Senior Member |
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Hi
I have an image 216x216. I wanted to overplot on that image the vectors.
Below it's my code
vector_size = fltarr(20,20)
dims_i_need = size(vector_size, /Dimensions)
posx = Rebin(Findgen(dims_i_need[0]), dims_i_need[0], dims_i_need[1])
posy = Rebin(Reform(Findgen(dims_i_need[1]), 1, dims_i_need[1]), dims_i_need[0], dims_i_need[1])
cgDisplay, 100,100
cgimage, image
cgDrawVectors, Vx, Vy, posx, posy, /ORDERED, overplot = 1
The problem is that the vectors are not plotted at the whole image but at a part of the image.
posx and posy are positions arrays. If the image is [216,216] and the vectors have dimensions [20,20] how we can plot this on top of the whole image?
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| Re: help with cgDrawVectors [message #91194 is a reply to message #91191] |
Mon, 15 June 2015 17:26  |
David Fanning
Messages: 11724
Registered: August 2001
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Senior Member |
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g.nacarts@gmail.com writes:
> I have an image 216x216. I wanted to overplot on that image the vectors.
>
> Below it's my code
>
> vector_size = fltarr(20,20)
> dims_i_need = size(vector_size, /Dimensions)
> posx = Rebin(Findgen(dims_i_need[0]), dims_i_need[0], dims_i_need[1])
> posy = Rebin(Reform(Findgen(dims_i_need[1]), 1, dims_i_need[1]), dims_i_need[0], dims_i_need[1])
>
> cgDisplay, 100,100
> cgimage, image
> cgDrawVectors, Vx, Vy, posx, posy, /ORDERED, overplot = 1
>
> The problem is that the vectors are not plotted at the whole image but at a part of the image.
> posx and posy are positions arrays. If the image is [216,216] and the vectors have dimensions [20,20] how we can plot this on top of the whole image?
You need to set up the appropriate coordinate system (probably through a
set of axes) for your image, in order for your vectors to be draw on top
of it in that coordinate system.
Cheers,
David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.idlcoyote.com/
Sepore ma de ni thue. ("Perhaps thou speakest truth.")
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| Re: help with cgDrawVectors [message #91200 is a reply to message #91194] |
Tue, 16 June 2015 08:11 |
g.nacarts
Messages: 148
Registered: November 2013
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Senior Member |
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I used the XRANGE and YRANGE keywords basically.
i.e. cgimage, image, xrange=[0,19], yrange=[0,19]
The vectors have size [20,20]. When I used xrange=[0,20] and yrange=[0,20] a very small part on the top and left side of the image was empty, so I reduce the max value to 19 but I am not sure whether this make sense or not.
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| Re: help with cgDrawVectors [message #91202 is a reply to message #91200] |
Tue, 16 June 2015 18:57 |
David Fanning
Messages: 11724
Registered: August 2001
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Senior Member |
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g.nacarts@gmail.com writes:
> The vectors have size [20,20]. When I used xrange=[0,20] and yrange=[0,20] a very small part on the top and left side of the image was empty, so I reduce the max value to 19 but I am not sure whether this make sense or not.
What would you need to know to make you sure?
Cheers,
David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.idlcoyote.com/
Sepore ma de ni thue. ("Perhaps thou speakest truth.")
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