zoom.extent([extent]) If extent is specified, sets the viewport extent to the specified array of points [[x0, y0], [x1, y1]], where [x0, y0] is the top-left corner of the viewport and [x1, y1] is the bottom-right corner of the viewport, and returns this zoom behavior. The extent may also be specified as a function which returns such an array; if a function, it is invoked for each selected element, being passed the current datum d and index i, with the this context as the current DOM element.

zoom.filter([filter]) If filter is specified, sets the filter to the specified function and returns the zoom behavior. If filter is not specified, returns the current filter, which defaults to: function filter() { return !event.button; } If the filter returns falsey, the initiating event is ignored and no zoom gestures are started. Thus, the filter determines which input events are ignored. The default filter ignores mousedown events on secondary buttons, since those buttons are typically

x.x([x]) If x is specified, sets the x-coordinate accessor to the specified number or function, re-evaluates the x-accessor for each node, and returns this force. If x is not specified, returns the current x-accessor, which defaults to: function x() { return 0; } The x-accessor is invoked for each node in the simulation, being passed the node and its zero-based index. The resulting number is then stored internally, such that the target x-coordinate of each node is only recomputed when the

y.y([y]) If y is specified, sets the y-coordinate accessor to the specified number or function, re-evaluates the y-accessor for each node, and returns this force. If y is not specified, returns the current y-accessor, which defaults to: function y() { return 0; } The y-accessor is invoked for each node in the simulation, being passed the node and its zero-based index. The resulting number is then stored internally, such that the target y-coordinate of each node is only recomputed when the

y.strength([strength]) If strength is specified, sets the strength accessor to the specified number or function, re-evaluates the strength accessor for each node, and returns this force. The strength determines how much to increment the node’s y-velocity: (y - node.y) × strength. For example, a value of 0.1 indicates that the node should move a tenth of the way from its current y-position to the target y-position with each application. Higher values moves nodes more quickly to the target pos

voronoi.size([size]) An alias for voronoi.extent where the minimum x and y of the extent are ⟨0,0⟩. Equivalent to: voronoi.extent([[0, 0], size]);

voronoi.triangles(data) Returns the Delaunay triangulation of the specified data array as an array of triangles. Each triangle is a three-element array of elements from data. Equivalent to: voronoi(data).triangles(); See diagram.triangles for more detail.

voronoi.y([y]) If y is specified, sets the y-coordinate accessor. If y is not specified, returns the current y-coordinate accessor, which defaults to: function y(d) { return d[1]; }

voronoi.x([x]) If x is specified, sets the x-coordinate accessor. If x is not specified, returns the current x-coordinate accessor, which defaults to: function x(d) { return d[0]; }

x.strength([strength]) If strength is specified, sets the strength accessor to the specified number or function, re-evaluates the strength accessor for each node, and returns this force. The strength determines how much to increment the node’s x-velocity: (x - node.x) × strength. For example, a value of 0.1 indicates that the node should move a tenth of the way from its current x-position to the target x-position with each application. Higher values moves nodes more quickly to the target pos