[Gambas-user] an "Is this possible question" about images

Sun Apr 17 05:21:49 CEST 2011

On Sunday 17 April 2011 10:16:52 Shane Powell wrote:
> On 16/04/11 21:38, richard terry wrote:
> > On Saturday 16 April 2011 20:32:22 Shane Powell wrote:
> > Hi Shane,
> >
> > I''ve re-arranged the screen from 0.0.3 to show you what happens when 
> > you have a (roughly) proportional picture.
> >
> > If you leave the drawing code as is in DrawingArea1_Draw() you'll see
> > what I mean about the area under the mouse cursor point not being
> > translated into the viewing window. I've set it back to the shoulder Xray
> > which is tiny.
> >
> > I wondered if there was a logical relationship then, between the mouse
> > cursor using this drawing method and what to show.
> >
> > Regards
> >
> > Richard
> >
> >> On 16/04/11 15:27, richard terry wrote:
> >>> On Saturday 16 April 2011 10:29:15 Shane Powell wrote:
> >>>
> >>> Hi Shane,
> >>>
> >>> I had an 11MB picture I wanted to magnify (I'll send you an image of
> >>> this off list), with your last code iteration only part of the image
> >>> was shown, so I changed the code in the drawingarea1_draw, to make the
> >>> whole image show.
> >>>
> >>> However now, the mouse pointer dosn't show what's under it.
> >>>
> >>> ?? fixable??
> >>>
> >>> I'll send make the picture where the mouse was so that you can see what
> >>> the mouse was actually pointing at and what showed in the magnified
> >>> area.
> >>>
> >>> Otherwise, the prototype looks good. We should buff it up and put it
> >>> into the gambas examples!
> >>>
> >>> Regards
> >>>
> >>> richard
> >>>
> >>>> On 16/04/11 08:53, richard terry wrote:
> >>>>> On Saturday 16 April 2011 00:23:47 Shane Powell wrote:
> >>>>>
> >>>>> Thanks heaps to shane, Caveat and all - I'll try a look at all this
> >>>>> today and report back.
> >>>>>
> >>>>> Regards
> >>>>>
> >>>>> Richard
> >>>>>
> >>>>>> On 15/04/11 22:58, richard terry wrote:
> >>>>>>> On Friday 15 April 2011 17:02:25 richard terry wrote:
> >>>>>>> Hi Kevin/List,
> >>>>>>>
> >>>>>>> I took at quick look at this, but my lame brain never functions
> >>>>>>> with basic mathematical problems, I enclose an embryonic code.
> >>>>>>>
> >>>>>>> This 'sort of' works, theres a drawing area into which I loaded the
> >>>>>>> image of a shoulder Xray and then another  on top which will be the
> >>>>>>> magnifier. I put a couple of textboxes on it to change some of the
> >>>>>>> internal values, but can't seem to figure out the magnification
> >>>>>>> factors.
> >>>>>>>
> >>>>>>> If I click over this it does move around and magnify, albeit not
> >>>>>>> lined up properly and sometimes it seems to get lost. It would be
> >>>>>>> nice to have this be say a circle, with a border, and be accurate,
> >>>>>>> maybe someone can modfy the code to make it work.
> >>>>>>>
> >>>>>>> Any help appreciated.
> >>>>>>>
> >>>>>>>> On Friday 15 April 2011 16:15:13 Kevin Fishburne wrote:
> >>>>>>>> Thanks, and to  Rolf-Werner Eilert's reply, I'll take a look at
> >>>>>>>> these suggestions when I go home.
> >>>>>>>>
> >>>>>>>> I need a little 'side project' to stave off the bordum of the
> >>>>>>>> hum-drum debugging of the main project.
> >>>>>>>>
> >>>>>>>> Will post back my  sucess or lack therof
> >>>>>>>>
> >>>>>>>> Regards
> >>>>>>>>
> >>>>>>>> Richard
> >>>>>>>>
> >>>>>>>>> On 04/15/2011 12:47 AM, richard terry wrote:
> >>>>>>>>>>> Do you need it to look like a fisheye-style lens effect, or
> >>>>>>>>>>> just box-zoom an area? If the latter this can be done easily in
> >>>>>>>>>>> gb code.
> >>>>>>>>>>
> >>>>>>>>>> Just the box-zoom .
> >>>>>>>>>>
> >>>>>>>>>> Any change of you giving me a helping hand? I've not done
> >>>>>>>>>> anything much with images or drawing.
> >>>>>>>>>>
> >>>>>>>>>> I'll mail you a sample png if you want - the purpose here is to
> >>>>>>>>>> magnify areas of either skin, xray films or dermatascope images
> >>>>>>>>>> - all are images at the end of the day.
> >>>>>>>>>>
> >>>>>>>>>> Its for our open - source medical records project that Ian and I
> >>>>>>>>>> are chuggling slowly along with - not releasable as yet by I'm
> >>>>>>>>>> hoping that by the end of 2011 it will be pretty much beta.
> >>>>>>>>>
> >>>>>>>>> That is very cool. I'm doing a game so I know a little about
> >>>>>>>>> images in gb.
> >>>>>>>>>
> >>>>>>>>> I'm going to assume that you're using Qt or GTK and not SDL or
> >>>>>>>>> OpenGL, but correct me if I'm wrong. For those the easiest way to
> >>>>>>>>> do graphics is with a DrawingArea control. After creating it on
> >>>>>>>>> the form I'd change the Cached property to True so it will
> >>>>>>>>> automatically redraw itself if something moves over it.
> >>>>>>>>>
> >>>>>>>>> You create image variables and load image files into them like
> >>>>>>>>> this:
> >>>>>>>>>
> >>>>>>>>> Dim/Public someimage As Image
> >>>>>>>>> someimage = Image.Load("FleshEatingVirusNooooo.jpg")
> >>>>>>>>>
> >>>>>>>>> You write images to the DrawingArea control like this:
> >>>>>>>>>
> >>>>>>>>> Draw.Begin(DrawingArea1)
> >>>>>>>>>        Draw.Image(someimage, X, Y, [Width, Height, SrcX, SrcY,
> >>>>>>>>> SrcWidth, SrcHeight])
> >>>>>>>>>        ' Add more "Draw.Image" statements here to composite
> >>>>>>>>> additional images into the DrawingArea.
> >>>>>>>>> Draw.End ' Commits the composition to the DrawingArea so that it
> >>>>>>>>> may be seen. May need a "Wait" statement if done repeatedly.
> >>>>>>>>>
> >>>>>>>>> The [bracketed] parameters are optional. someimage is the source
> >>>>>>>>> and the DrawingArea is the target. You can specify a subset of
> >>>>>>>>> the source (the area to be zoomed) by playing with SrcX and SrcY
> >>>>>>>>> (upper-left corner of source to be drawn) and SrcWidth and
> >>>>>>>>> SrcHeight (width and height relative to SrcX and SrcY of source
> >>>>>>>>> to be drawn). You can scale the source by playing with Width and
> >>>>>>>>> Height.
> >>>>>>>>>
> >>>>>>>>> So that the source image writes to the DrawingArea don't leave a
> >>>>>>>>> trail, I'd first draw the main (unzoomed) image to the
> >>>>>>>>> DrawingArea, then draw the zoomed area onto that for each "frame"
> >>>>>>>>> that you draw. The logic would go something like:
> >>>>>>>>>
> >>>>>>>>> ' Create your image variables.
> >>>>>>>>> ' Load images into your image variables.
> >>>>>>>>> Draw.Begin(DrawingAreaControlName)
> >>>>>>>>> ' Draw the main image into the DrawingArea.
> >>>>>>>>> ' Draw part of the main image into the DrawingArea adjusted by
> >>>>>>>>> cursor position, zoom area size and zoom level.
> >>>>>>>>> ' Draw text or whatever else you need to into the DrawingArea.
> >>>>>>>>> Draw.End
> >>>>>>>>>
> >>>>>>>>> To draw text, which is really cool, you may do something like
> >>>>>>>>> this inside the Draw.Begin/End:
> >>>>>>>>>
> >>>>>>>>> Draw.Foreground = Color.Black
> >>>>>>>>> Draw.Text("Look, it's text on an image with a crappy shadow!!!",
> >>>>>>>>> X, Y) Draw.Foreground = Color.White
> >>>>>>>>> Draw.Text("Look, it's text on an image with a crappy shadow!!!",
> >>>>>>>>> X + 1, Y - 1)
> >>>>>>>>>
> >>>>>>>>> I don't have any project examples that are simple enough to
> >>>>>>>>> demonstrate this, but if you're really having trouble I could put
> >>>>>>>>> something together.
> >>>>>>>>
> >>>>>>>> ------------------------------------------------------------------
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> >>>>>>>> _______________________________________________
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> >>>>>>>>
> >>>>>>>>
> >>>>>>>>
> >>>>>>>> ------------------------------------------------------------------
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> >>>>>>>> virtualization is a top priority.Virtualization can reduce costs,
> >>>>>>>> simplify management, and improve application availability and
> >>>>>>>> disaster protection. Learn more about boosting the value of server
> >>>>>>>> virtualization.
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> >>>>>>>>
> >>>>>>>>
> >>>>>>>> _______________________________________________
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> >>>>>>
> >>>>>> this is how i would do it when the mouse cursor get to the right  or
> >>>>>> the bottom of the image it starts to strech but you could just limit
> >>>>>> the mouse travel and the rest you could make how you wanted easy i
> >>>>>> think hope it helps
> >>>>>
> >>>>> ---------------------------------------------------------------------
> >>>>>-- -- ----- Benefiting from Server Virtualization: Beyond Initial
> >>>>> Workload Consolidation -- Increasing the use of server virtualization
> >>>>> is a top priority.Virtualization can reduce costs, simplify
> >>>>> management, and improve application availability and disaster
> >>>>> protection. Learn more about boosting the value of server
> >>>>> virtualization.
> >>>>> http://p.sf.net/sfu/vmware-sfdev2dev
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> >>>>
> >>>> just some more tinkering
> >>>>
> >>>>
> >>>>
> >>>> ----------------------------------------------------------------------
> >>>>-- ------ Benefiting from Server Virtualization: Beyond Initial
> >>>> Workload Consolidation -- Increasing the use of server virtualization
> >>>> is a top priority.Virtualization can reduce costs, simplify
> >>>> management, and improve application availability and disaster
> >>>> protection. Learn more about boosting the value of server
> >>>> virtualization.
> >>>> http://p.sf.net/sfu/vmware-sfdev2dev
> >>>>
> >>>>
> >>>> _______________________________________________
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> >>
> >> hi richard try this
> >>
> >>
> >>
> >> ------------------------------------------------------------------------
> >>------ Benefiting from Server Virtualization: Beyond Initial Workload
> >> Consolidation -- Increasing the use of server virtualization is a top
> >> priority.Virtualization can reduce costs, simplify management, and
> >> improve application availability and disaster protection. Learn more
> >> about boosting the value of server virtualization.
> >> http://p.sf.net/sfu/vmware-sfdev2dev
> >>
> >>
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> 
> ok i see what you mean The reason for this is the magnifying code works
> with the original picture loaded but when you load the main picture it
> has been scaled up to fit the drawing area or in some case maybe scaled
> down and possibly not keeping the aspect ratio. to my mind showing the
> picture at it original size and then magnifying a small area would be
> the way to but if not you just need to work with the picture in the
> drawingarea. also if this is the case why not just scale the whole
> picture up and down ?

One does need to see the whole picture, I guess displaying this keeping the 
aspect ration would be the way to go. Also my original method was to have a 
second drawing area with property not fixed, sitting on top of the picture, 
which the mouse would then move around magnifying what was under it. I had 
hoped at some point to make this a 'fancy' design - ie looking like a 
magnifying glass, with the contents being the magnifed area.

For Xrays, the method you describe (up/down scaling) would work well. For 
dermoscopy pictures (hi-magnification snaps of skin lesions), you really need 
to move over a section of the image.

Anway, thank for all your input/help. If you are interested in continuing to 
develop this little module, I'd love some help, as I don't have the abilities 
to do it.

Regards

Richard

> 
> ---------------------------------------------------------------------------
> --- Benefiting from Server Virtualization: Beyond Initial Workload
> Consolidation -- Increasing the use of server virtualization is a top
> priority.Virtualization can reduce costs, simplify management, and improve
> application availability and disaster protection. Learn more about boosting
> the value of server virtualization. http://p.sf.net/sfu/vmware-sfdev2dev
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