There is a method on RenderObject to get the correct absolute
coordinates of the renderer, which correctly takes transforms,
scrolling etc into account: RenderObject::localToAbsolute(). This is
not a trivial problem.
There are APIs exposed to JavaScript for this too: the offsetParent/
offsetX/offsetY, and getBoundingClientRect (see http://www.w3.org/TR/cssom-view/
); these, however, are not transform-aware.
What code are you in where you need these coordinates?
Simon
On Jun 1, 2009, at 10:00 AM, Lucius Fox wrote:
Thank you.
So to get absolute co-ordinates of each Render Object, I need to do
something like:
int absolute_x = 0;
int absolute_y = 0;
parent = renderObject.getParent()
while (parent != RenderBody) {
absolute_x += parent.getX();
absolute_y += parent.getY();
}
Is that right?
Thank you.
On Sun, May 31, 2009 at 3:11 PM, Eric Seidel <[email protected]>
wrote:
To expand Darin's answer: there are exceptions to the
relative-to-containing-block rule. SVG results for example are
absolute
(mostly). There are also hacks the the DRT output, where we "lie"
about
metrics in order to keep consistent with historical results (to
minimize the
scope of a single patch). If you're trying to use DRT for anything
other
than testing, you will likely need to fork WebCore's
RenderTreeAsText.cpp
and SVGRenderTreeAsText.cpp substantially to fit your needs.
-eric
On Sun, May 31, 2009 at 10:19 AM, Darin Adler <[email protected]>
wrote:
Coordinates in DumpRenderTree output are relative to the
containing block,
not absolute.
-- Darin
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