bool snapTo(const SubtargetGeometry& geom, const IntPoint& touchPoint, const IntRect& touchArea, IntPoint& adjustedPoint)
{
FrameView* view = geom.node()->document()->view();
FloatQuad quad = geom.quad();
if (quad.isRectilinear()) {
IntRect contentBounds = geom.boundingBox();
// Convert from frame coordinates to window coordinates.
IntRect bounds = view->contentsToWindow(contentBounds);
if (bounds.contains(touchPoint)) {
adjustedPoint = touchPoint;
return true;
}
if (bounds.intersects(touchArea)) {
bounds.intersect(touchArea);
adjustedPoint = bounds.center();
return true;
}
return false;
}
// The following code tries to adjust the point to place inside a both the touchArea and the non-rectilinear quad.
// FIXME: This will return the point inside the touch area that is the closest to the quad center, but does not
// guarantee that the point will be inside the quad. Corner-cases exist where the quad will intersect but this
// will fail to adjust the point to somewhere in the intersection.
// Convert quad from content to window coordinates.
FloatPoint p1 = contentsToWindow(view, quad.p1());
FloatPoint p2 = contentsToWindow(view, quad.p2());
FloatPoint p3 = contentsToWindow(view, quad.p3());
FloatPoint p4 = contentsToWindow(view, quad.p4());
quad = FloatQuad(p1, p2, p3, p4);
if (quad.containsPoint(touchPoint)) {
adjustedPoint = touchPoint;
return true;
}
// Pull point towards the center of the element.
FloatPoint center = quad.center();
adjustPointToRect(center, touchArea);
adjustedPoint = roundedIntPoint(center);
return quad.containsPoint(adjustedPoint);
}