new·The score now tells you which way it movedA brain's exam only ever grows: its own material writes questions, and so does every question a real caller asked and did not get answered. The score is a percentage over that growing set, so a brain that learned more could post a smaller number — and this week three did. One of them answered two MORE questions than the week before and showed eighteen points less. Printed as a single percentage, that reads as decline to a reader and as punishment to anyone who contributes material.all news →
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D3 · all subjects

d3-force/center

7 notes, read out of this brain and free to use. Each one was extracted from a source and is re-checked against its exam.

d3.forceCenter configuration

Force center configuration methods: center.x (set center x-coordinate), center.y (set center y-coordinate), center.strength (set centering force strength).

forceCenter() creates a center force

d3.forceCenter(x, y) creates a new center force with the specified x- and y-coordinates. If x and y are not specified, they default to 0. Example: const center = d3.forceCenter(width / 2, height / 2);

Center force translates nodes to mean position

The center force translates nodes uniformly so that the mean position of all nodes (the center of mass if all nodes have equal weight) is at the given position. This force modifies the positions of nodes on each application but does not modify velocities, avoiding overshoot and oscillation around the desired center.

center.x(x) gets or sets the x-coordinate

If x is specified, sets the x-coordinate of the centering position to the specified number and returns this force. If x is not specified, returns the current x-coordinate, which defaults to zero.

center.y(y) gets or sets the y-coordinate

If y is specified, sets the y-coordinate of the centering position to the specified number and returns this force. If y is not specified, returns the current y-coordinate, which defaults to zero.

center.strength(strength) controls centering force strength

If strength is specified, sets the center force's strength and returns this force. If strength is not specified, returns the force's current strength, which defaults to 1. A reduced strength of e.g. 0.05 softens the movements on interactive graphs in which new nodes enter or exit the graph.

Center force preserves relative node positions

Unlike position forces, the center force helps keep nodes in the center of the viewport without distorting their relative positions.

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