/**
* Computes clipping rectangle(s) for a given connection. Will consider all enclosing viewports,
* excluding the root viewport.
*/
protected Rectangle[] getEdgeClippingRectangle(Connection connection) {
// start with clipping the connection at its original bounds
Rectangle clipRect = getAbsoluteBoundsAsCopy(connection);
// in case we cannot infer source and target of the connection (e.g.
// if XYAnchors are used), returning the bounds is all we can do
ConnectionAnchor sourceAnchor = connection.getSourceAnchor();
ConnectionAnchor targetAnchor = connection.getTargetAnchor();
if (sourceAnchor == null
|| sourceAnchor.getOwner() == null
|| targetAnchor == null
|| targetAnchor.getOwner() == null) {
return new Rectangle[] {clipRect};
}
// source and target figure are known, see if there is common
// viewport
// the connection has to be clipped at.
IFigure sourceFigure = sourceAnchor.getOwner();
IFigure targetFigure = targetAnchor.getOwner();
Viewport nearestEnclosingCommonViewport =
ViewportUtilities.getNearestCommonViewport(sourceFigure, targetFigure);
if (nearestEnclosingCommonViewport == null) {
return new Rectangle[] {clipRect};
}
// if the nearest common viewport is not the root viewport, we may
// start with clipping the connection at this viewport.
if (nearestEnclosingCommonViewport != getRootViewport()) {
clipRect.intersect(getNodeClippingRectangle(nearestEnclosingCommonViewport));
}
// if the nearest common viewport of source and target is not
// simultaneously
// the nearest enclosing viewport of source and target respectively, the
// connection has to be further clipped (the connection may even not be
// visible at all)
Viewport nearestEnclosingSourceViewport =
ViewportUtilities.getNearestEnclosingViewport(sourceFigure);
Viewport nearestEnclosingTargetViewport =
ViewportUtilities.getNearestEnclosingViewport(targetFigure);
if (nearestEnclosingSourceViewport != nearestEnclosingTargetViewport) {
// compute if source and target anchor are visible
// within the nearest common enclosing viewport (which may
// itself be nested in other viewports).
Rectangle sourceClipRect = getAbsoluteBoundsAsCopy(connection);
if (nearestEnclosingSourceViewport != nearestEnclosingCommonViewport) {
clipAtViewports(
sourceClipRect,
ViewportUtilities.getViewportsPath(
nearestEnclosingSourceViewport, nearestEnclosingCommonViewport, false));
}
Rectangle targetClipRect = getAbsoluteBoundsAsCopy(connection);
if (nearestEnclosingTargetViewport != nearestEnclosingCommonViewport) {
clipAtViewports(
targetClipRect,
ViewportUtilities.getViewportsPath(
nearestEnclosingTargetViewport, nearestEnclosingCommonViewport, false));
}
PointList absolutePointsAsCopy = getAbsolutePointsAsCopy(connection);
boolean sourceAnchorVisible =
sourceClipRect.getExpanded(PRIVATE_INSETS).contains(absolutePointsAsCopy.getFirstPoint());
boolean targetAnchorVisible =
targetClipRect.getExpanded(PRIVATE_INSETS).contains(absolutePointsAsCopy.getLastPoint());
if (!sourceAnchorVisible || !targetAnchorVisible) {
// one (or both) of source or target anchor is invisible
// within the nearest common viewport, so up to now
// we regard the edge as invisible.
return new Rectangle[] {};
// TODO: We could come up with a more decent strategy here,
// which also computes clipping fragments in those cases
// where source/target are not visible but the edge
// intersects with the enclosing source/target viewport's
// parents bounds.
} else {
// both ends are visible, so just return what we have
// computed before
// (clipping at nearest enclosing viewport)
return new Rectangle[] {clipRect};
}
} else {
// source and target share the same enclosing viewport, so just
// return what we have computed before (clipping at nearest
// enclosing viewport)
return new Rectangle[] {clipRect};
}
}
