private void mouseDown(GwtEvent<? extends EventHandler> event) {
int[] coord = getCoordinates(event);
previousX = coord[0];
previousY = coord[1];
isMouseDown = true;
if (canvas instanceof InteractorCanvas && draggableNode == null)
draggableNode = ((InteractorCanvas) canvas).getDraggableNode(new Point(previousX, previousY));
diagramPane.hideTooltip();
}
private void centreObject(GraphObject obj) {
// Centre selected object
// PathwayCanvas c = diagramPane.getCanvas();
double scale = canvas.getScale();
Point objPos = obj.getPosition();
double objX = objPos.getX();
double objY = objPos.getY();
double x = (objX * -1.0 * scale) + (canvas.getCoordinateSpaceWidth() / 2);
double y = (objY * -1.0 * scale) + (canvas.getCoordinateSpaceHeight() / 2);
diagramPane.reset();
diagramPane.scale(scale);
diagramPane.translate(x, y, true);
diagramPane.hideTooltip();
}