Messages from Usenet group comp.lang.idl-pvwave, compiled by Paulo Penteado
Re: Scrolling in draw widgets - newbie's question
Evgeny Turchin wrote: > > Hello, All ! > Here's the text of my program: > > base = WIDGET_BASE(XSIZE=650, YSIZE=400) > draw1 = WIDGET_DRAW(base, XSIZE = 550, X_SCROLL_SIZE=200, YSIZE = 550, > Y_SCROLL_SIZE=200, XOFFSET=5, /APP_SCROLL) > WIDGET_CONTROL, /REALIZE, base > WIDGET_CONTROL, draw1, GET_VALUE = index > WSET, index > ImageIsRead=DIALOG_READ_IMAGE(FILE=FileName, FILTER_TYPE='.tif, .tiff', $ > IMAGE=PhotoArray) > TVSCL, PhotoArray > > The image is successfuly loaded in the viewport but the scrolling does not > work. Does anybody know > how to solve the problem and create the widget where scrolling is possible > in graphic viewport? > I'm using IDL 5.4 for Win32. Try this instead: base = widget_base() draw = widget_draw(base, xsize=1024, ysize=1024, $ x_scroll_size=512, y_scroll_size=512) widget_control, base, /realize plot, indgen(10) Also see the SWINDOW procedure: http://www.astro.washington.edu/deutsch-bin/idllibsrch?keywo rd=swindow Cheers, Liam. Practical IDL Programming http://www.gumley.com/
Evgeny Turchin (evgturchin@narod.ru) writes: > Here's the text of my program: > > base = WIDGET_BASE(XSIZE=650, YSIZE=400) > draw1 = WIDGET_DRAW(base, XSIZE = 550, X_SCROLL_SIZE=200, YSIZE = 550, > Y_SCROLL_SIZE=200, XOFFSET=5, /APP_SCROLL) > WIDGET_CONTROL, /REALIZE, base > WIDGET_CONTROL, draw1, GET_VALUE = index > WSET, index > ImageIsRead=DIALOG_READ_IMAGE(FILE=FileName, FILTER_TYPE='.tif, .tiff', $ > IMAGE=PhotoArray) > TVSCL, PhotoArray > > The image is successfuly loaded in the viewport but the scrolling does not > work. Well, it is hard to know what "doesn't work" means, unless this is the *entire* program, then it's pretty obvious: most of the required code is missing. :-) Here is a program that appears to "work". ************************************************************ ****** PRO Example_Event, event Widget_Control, event.top, Get_UValue=image IF event.type EQ 3 THEN BEGIN ; Scroll events s = Size(image, /Dimensions) xstart = 0 > event.x < (s[0]/2) xfinish = (s[0]/2) > (event.x + (s[0]/2)) < (s[0]-1) ystart = 0 > event.y < (s[1]/2) yfinish = (s[1]/2) > (event.y + (s[1]/2)) < (s[1]-1) TV, image[xstart:xfinish, ystart:yfinish] ENDIF IF event.type EQ 4 THEN BEGIN ; Expose events Widget_Control, event.id, Get_Draw_View=viewport s = Size(image, /Dimensions) xstart = 0 > viewport[0] < (s[0]/2) xfinish = (s[0]/2) > (viewport[0] + (s[0]/2)) < (s[0]-1) ystart = 0 > viewport[1] < (s[1]/2) yfinish = (s[1]/2) > (viewport[1] + (s[1]/2)) < (s[1]-1) TV, image[xstart:xfinish, ystart:yfinish] ENDIF END PRO Example, image IF N_Elements(image) EQ 0 THEN BEGIN image = BytArr(360,360) filename = Filepath(SubDir=['examples', 'data'], 'worldelv.dat') OpenR, lun, filename, /Get_Lun ReadU, lun, image Free_Lun, lun ENDIF s = Size(image, /Dimensions) base = WIDGET_BASE() draw1 = WIDGET_DRAW(base, XSIZE = s[0], X_SCROLL_SIZE=s[0]/2, $ YSIZE = s[1], Y_SCROLL_SIZE=s[1]/2, /APP_SCROLL) WIDGET_CONTROL, /REALIZE, base WIDGET_CONTROL, draw1, GET_VALUE = index WSET, index TV, image[0:s[0]-1, s[1]/2:*] WIDGET_CONTROL, base, Set_UValue=image XManager, 'example', base, /No_Block END ************************************************************ ****** Call it with your image, like this: IDL> ImageIsRead=DIALOG_READ_IMAGE(FILE=FileName, $ FILTER_TYPE='.tif, .tiff', IMAGE=PhotoArray) IDL> Example, photoarray Unfortunately, I'm afraid this is going to raise more questions than it answers. :-( Cheers, David -- David W. Fanning, Ph.D. Fanning Software Consulting, Inc. Phone: 970-221-0438, E-mail: david@dfanning.com Coyote's Guide to IDL Programming: http://www.dfanning.com/ Toll-Free IDL Book Orders: 1-888-461-0155