Hi Larry, hi Stefan thank you for your detailed explanation! So the Current Scale in Change Style>Scale is equal the RealScale.
But what is about the check box "Only show layer when scale is between:" There we find the hint Units/Pixel. Is the "Smallest/Largest" Scale in Units/Pixel (InternalScale) or the RealScale from Stefan? Regards, Uwe Larry Becker schrieb: > Oops, I meant to say: > > Of course, a scale expressed as a ratio of 1:3780 means that one > unit on the map represents 3780 units on the ground. So if we were to > print out the new project window as it was first opened, we would see > that one cm on the paper would be equivalent to 3780 cm or 37.8 m in the > real world. This, of course, assumes that Stefan's math is correct. > > Larry > On 8/18/07, Larry Becker <[EMAIL PROTECTED]> wrote: > >> Hi Uwe, >> >> There are two kinds of scale in JUMP. The internal scale is given by: >> >> internalScale = ModeViewWidth / PixelViewWidth. (typically units of >> meters/pixel) >> >> The internalScale is used to transform distance between model space >> and screen space (at a particular view's zoom level) via a simple >> multiplication or division. >> >> Stefan modified the Change Style>Scale panel to compute a new display >> scale in late 2005 he called real scale. He used: >> >> realScale = ModeViewWidth * 100 / (INCHTOCM / SCREENRES * PixelViewWidth) >> >> This is basically the same equation with the conversion from pixel >> size to model units factored in. When a new project window is first >> created, the internalScale will be 1 and every pixel will be one model >> unit wide. The realScale will be 3779.527559055118 or approximately >> 3780 as you reported (given a SCREENRES of 96 and an INCHTOCM of >> 2.54). >> >> Of course, a scale expressed as a ratio of say 1:5000 means that one >> unit on the map represents 5000 units on the ground. So if we were to >> print out the new project window as it was first opened, we would see >> that one cm on the paper would be equivalent to 5000 cm or 50 m in the >> real world. This, of course, assumes that Stefan's math is correct. >> :-) >> >> regards, >> Larry Becker >> >> >> >> On 8/18/07, Uwe Dalluege <[EMAIL PROTECTED]> wrote: >> >>> Hi, >>> >>> does anybody knows how the scale >>> of Change Style>Scale is calculate? >>> >>> I have a screen resolution of 1280 x 1024 pixel. >>> When I use OpenJUMP with full screen >>> the graphical window has a size of about 1060 x 860 units >>> (coordinate display). >>> >>> The current scale shows me a value of 1:3780. >>> >>> What does it mean? >>> >>> Regards, >>> >>> Uwe >>> >>> >>> >>> ------------------------------------------------------------------------- >>> This SF.net email is sponsored by: Splunk Inc. >>> Still grepping through log files to find problems? Stop. >>> Now Search log events and configuration files using AJAX and a browser. >>> Download your FREE copy of Splunk now >> http://get.splunk.com/ >>> _______________________________________________ >>> Jump-pilot-devel mailing list >>> Jump-pilot-devel@lists.sourceforge.net >>> https://lists.sourceforge.net/lists/listinfo/jump-pilot-devel >>> >>> >> -- >> http://amusingprogrammer.blogspot.com/ >> >> > > > ------------------------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/ _______________________________________________ Jump-pilot-devel mailing list Jump-pilot-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/jump-pilot-devel
