| Re: x/y margin from map_set to plot position and cgimage [message #85679 is a reply to message #85677] |
Mon, 26 August 2013 11:20   |
Andy Sayer
Messages: 127
Registered: February 2009
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Senior Member |
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I guess this question could be posed more generally as: how can I identify what parts of an image window lie within the portion available for drawing the map after a call to map_set, and how can I pass this to other routines such as cgimage?
Andy
On Monday, August 26, 2013 1:36:06 PM UTC-4, AMS wrote:
> Hi all,
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> Suppose I have set up a part of a window to draw a map, and used xmargin and ymargin to specify the margins around this map. For example:
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> map_set,0,0,xmargin=[2,2],ymargin=[2,2]
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> Suppose I then want to draw an image (with cgimage) inside this map. Is there a way to pass the xmargin/ymargin information so the image is drawn inside the map region rather than the whole plot window? I don't see those as keywords to cgimage. If not, is there some way I can pull out the plot position which arose from my map_set call and pass this to cgimage? I can't necessarily assume that !p.multi=0, so I don't think the cgimage position keyword would help me here?
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> (I am switching over a lot of old code written for IDL 5/6 to use newer features and the Coyote library... so am now becoming familiar with some 'under the hood' stuff which I had not looked at in detail before. I'm now using IDL 7.1.1 and 8.2.2.)
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> I would not be averse to recoding to use something like the Coyote Graphics position keyword in my map_set call, but as far as I know that can't be done with map_set (and I don't want to pass the position keyword to map_set because often !p.multi will not be 0).
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> The longer story for what I am trying to do is that I have written code to map regularly or irregularly lat-lon gridded data from e.g. satellites. This basically makes use of polyfill to draw each point. If the grid is not regular, my code allows for a proper expression of the ground pixel size. But if the grid is regular (e.g. level 3 data), I figure I should be able to map it as an image, which could be a lot faster than using polyfill.
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> Thanks,
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> Andy
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