Search All of the Math Forum:
Views expressed in these public forums are not endorsed by
NCTM or The Math Forum.



Re: Placing images in the coordinate system?
Posted:
Oct 5, 2009 7:38 AM


I had a similar questin for v 6 where I want to be able to rescale the image & graphic interactively.
I have a bitmap image (.bmp file)  call it pict  that I wish to use as the background for some graphics. I do this with
Graphics[Table[Point[{x, 50 Sin[2 \[Pi] x/100]}], {x, 0, 100}], Prolog > Inset[pict]]
(the actual graphics is more complicated than a sine curve but never mind).
Now if I just display the graphics by typing pict I can rescale this by clicking on the image and dragging the corners of the orange box. However when I overlay the graphics onto the image (as above) and try to drag the box it rescales the plot but not the background image. Is there any way I can link the two together so I can rescale by dragging the cursor? I tried GraphcsGrouping but that didn't get me anywhere.
> Original Message > From: mathgroupadm@smc.vnet.net > [mailto:mathgroupadm@smc.vnet.net] On Behalf Of Dave > Sent: 03 October 2009 14:03 > To: mathgroup@smc.vnet.net > Subject: Placing images in the coordinate system? > > Hello, > > Using Mathematica 7.0, how can I take an image and give it a position > and scale, so that it can be combined with other graphics? > > Here's what I am trying to do: I would like to have an image map of > the moon as the background for my plot or contour plot. I want to be > able to plot points by their lat,lon positions and have them appear at > the correct points on the map. > > I came up with a hack to do this by rasterizing the plot using Image[] > so that it is the same resolution as the moon image, and then > combining the two images. > (I found a similar technique here: > http://mathgis.blogspot.com/2007/12/funwithimageoverlay.html) > > The problem is this does not work if the plot has Axes>True, because > some space is used for the axes, so the coordinate systems don't match > exactly anymore. > > I really would like to have both Axes and the image together. Is there > a good way to do this? > > > Thanks, > Dave > >



