https://wiki.inkscape.org/wiki/index.php?action=history&feed=atom&title=CoordinateSystems 2026-04-30T22:56:42Z Revision history for this page on the wiki MediaWiki 1.36.1 https://wiki.inkscape.org/wiki/index.php?title=CoordinateSystems&diff=432&oldid=prev 2006-01-22T02:32:49Z

<p>link fix</p> <p><b>New page</b></p><div>Coordinate systems mentioned in the code or elsewhere:<br /> <br /> * Desktop<br /> * World<br /> * Root<br /> * Document: used for the contents of the document ie the SPObjects and whotnot. Each item in the SVG tree can have a transform, and the SPRoot appears to have yet another transform that can be applied (SPRoot::c2p).<br /> <br /> Abbreviations used for coordinate systems:<br /> <br /> * d<br /> * dt --- usually seems to mean `desktop'<br /> * doc<br /> * w --- I think this means `world'. GTK's view of things; used to pass in click positions etc.??<br /> <br /> Notes:<br /> <br /> Desktop has:<br /> * SPDesktop::_w2d. Only set in SPDesktop::set_display_area(). This seems to be called to set the viewport, and is set to be a scale of (1/newscale, 1/-newscale). Widely used by event handlers to convert from mouse click coordinates (from [[GdkEventButton]] etc.) into desktop coordinates, so I think w2d in this context means &quot;world to desktop&quot; where world is basically GDK's view of things.<br /> * SPDesktop::_d2w. Only set in the same place as _w2d. Set to (newscale, -newscale), ie the inverse of _w2d.<br /> * SPDesktop::_doc2dt. Initialised to a scale of (1, -1). After that only _doc2dt[5] is touched, ie the y translation. This is set to the height of the drawing whenever it changes.</div>

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