Hello, After some experimenting I have figured out that computing mouse position relative to the actual content (also ignoring all borders, margins and padding) can be done as following:
int innerX = xPos - tx - x(); int innerY = yPos - ty - y(); It has worked for me for a long time already. Please let me know if I am wrong and not taking some special cases into account. Sergiy Byelozyorov Computer Graphics Chair Universitat des Saarlandes Tel.: +49 (681) 302-3837 Web: http://graphics.cs.uni-saarland.de/sbyelozyorov/ On Thu, Mar 3, 2011 at 13:50, Sergiy Byelozyorov < [email protected]> wrote: > Hello, > > I develop an extension to WebKit which adds support for > XML3D<http://www.xml3d.org>. > For mouse events on XML3D element I have created custom event type > XML3DMouseEvent that inherits from MouseEvent. In addition to normal > coordinates it also has 3D position and normal of the element under the > cursor. In order to avoid massive changes into WebKit I have decided to > convert existing event from MouseEvent into XML3DMouseEvent when going > though overloaded XML3DElement::dispatchEvent which allows me to create > custom event class only for XML3D elements. > > There I also need to perform picking again to actually receive normal and > position. However at this stage I don't have actual coordinates where mouse > was relative to the actual rendered image (line x, y, tx and ty in > RenderObject::nodeAtPoint). All I get is MouseEvent with all it's parameters > and the element itself. > > Originally I tried using pageX and pageY and deducted offsetTop and > offsetLeft from them, but this does not take borders and padding into > account. I have tried accessing computedStyle to get border and padding > width, but the value in there has type Length and I am not sure how to > convert it to actual pixels. > > Please let me know how can mouse event position relative to element content > (not to border or padding). If there is a nicer and more straitforward way > to implement XML3DMouseEvent I would be happy to hear them. > > Sergiy Byelozyorov > Computer Graphics Chair > Universitat des Saarlandes > Tel.: +49 (681) 302-3837 > Web: http://graphics.cs.uni-saarland.de/sbyelozyorov/ > >
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