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waffle tips #2132

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merged 17 commits into from
Nov 21, 2024
Merged

waffle tips #2132

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7dcccea
waffle tips
Fil Aug 10, 2024
da7d094
test faceting
Fil Aug 14, 2024
1f0d634
simpler x
Fil Aug 15, 2024
caa5009
support waffle pointer, and simplify
Fil Aug 15, 2024
83d0a4d
crazy logic to compute the waffles' centroids
Fil Aug 29, 2024
f27e321
remove single hint
mbostock Sep 9, 2024
c7ef726
prettier
mbostock Sep 9, 2024
0233683
Merge branch 'main' into fil/waffle-tips
Fil Oct 30, 2024
8ef4c82
Merge branch 'main' into fil/waffle-tips
mbostock Nov 21, 2024
57f8e3c
tidy
mbostock Nov 21, 2024
0c7224f
pass cell dimensions as channels
mbostock Nov 21, 2024
e927e69
prettier
mbostock Nov 21, 2024
4ef5034
no filter on polygon
mbostock Nov 21, 2024
1f4518c
prettier
mbostock Nov 21, 2024
28bdcaf
fix tip option type
mbostock Nov 21, 2024
bed5d25
fewer channels
mbostock Nov 21, 2024
a67bd8d
default maxRadius to infinity
mbostock Nov 21, 2024
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112 changes: 92 additions & 20 deletions src/marks/waffle.js
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Original file line number Diff line number Diff line change
@@ -1,9 +1,11 @@
import {extent, namespaces} from "d3";
import {valueObject} from "../channel.js";
import {create} from "../context.js";
import {composeRender} from "../mark.js";
import {hasXY, identity, indexOf} from "../options.js";
import {applyChannelStyles, applyDirectStyles, applyIndirectStyles, getPatternId} from "../style.js";
import {template} from "../template.js";
import {initializer} from "../transforms/basic.js";
import {maybeIdentityX, maybeIdentityY} from "../transforms/identity.js";
import {maybeIntervalX, maybeIntervalY} from "../transforms/interval.js";
import {maybeStackX, maybeStackY} from "../transforms/stack.js";
Expand All @@ -15,7 +17,8 @@ const waffleDefaults = {

export class WaffleX extends BarX {
constructor(data, {unit = 1, gap = 1, round, render, multiple, ...options} = {}) {
super(data, {...options, render: composeRender(render, waffleRender("x"))}, waffleDefaults);
options = initializer({...options, render: composeRender(render, waffleRender("x"))}, waffleInitializer("x"));
super(data, options, waffleDefaults);
this.unit = Math.max(0, unit);
this.gap = +gap;
this.round = maybeRound(round);
Expand All @@ -25,19 +28,20 @@ export class WaffleX extends BarX {

export class WaffleY extends BarY {
constructor(data, {unit = 1, gap = 1, round, render, multiple, ...options} = {}) {
super(data, {...options, render: composeRender(render, waffleRender("y"))}, waffleDefaults);
options = initializer({...options, render: composeRender(render, waffleRender("y"))}, waffleInitializer("y"));
super(data, options, waffleDefaults);
this.unit = Math.max(0, unit);
this.gap = +gap;
this.round = maybeRound(round);
this.multiple = maybeMultiple(multiple);
}
}

function waffleRender(y) {
return function (index, scales, values, dimensions, context) {
const {ariaLabel, href, title, ...visualValues} = values;
const {unit, gap, rx, ry, round} = this;
const {document} = context;
function waffleInitializer(y) {
return function (data, facets, channels, scales, dimensions) {
const {round, unit} = this;

const values = valueObject(channels, scales);
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const Y1 = values.channels[`${y}1`].value;
const Y2 = values.channels[`${y}2`].value;

Expand All @@ -55,12 +59,51 @@ function waffleRender(y) {
const cx = Math.min(barwidth / multiple, scale * multiple);
const cy = scale * multiple;

// TODO insets?
const transform = y === "y" ? ([x, y]) => [x * cx, -y * cy] : ([x, y]) => [y * cy, x * cx];
// The reference position.
const tx = (barwidth - multiple * cx) / 2;
const x0 = typeof barx === "function" ? (i) => barx(i) + tx : barx + tx;
const y0 = scales[y](0);

// TODO insets?
const transform = y === "y" ? ([x, y]) => [x * cx, -y * cy] : ([x, y]) => [y * cy, x * cx];
const mx = typeof x0 === "function" ? (i) => x0(i) - barwidth / 2 : () => x0;
const [ix, iy] = y === "y" ? [0, 1] : [1, 0];

const n = Y2.length;
const P = new Array(n);
const X = new Float64Array(n);
const Y = new Float64Array(n);

for (let i = 0; i < n; ++i) {
P[i] = wafflePoints(round(Y1[i] / unit), round(Y2[i] / unit), multiple).map(transform);
const c = P[i].pop();
X[i] = c[ix] + mx(i);
Y[i] = c[iy] + y0;
}

this.cx = cx;
this.cy = cy;
this.x0 = x0;
this.y0 = y0;
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return {
channels: {
polygon: {value: P, source: null},
[y === "y" ? "x" : "y"]: {value: X, scale: null, source: null},
[`${y}1`]: {value: Y, scale: null, source: channels[`${y}1`]},
[`${y}2`]: {value: Y, scale: null, source: channels[`${y}2`]}
}
};
};
}

function waffleRender(y) {
return function (index, scales, values, dimensions, context) {
const {gap, cx, cy, rx, ry, x0, y0} = this;
const {ariaLabel, href, title, ...visualValues} = values;
const {document} = context;
const polygon = values.channels.polygon.value;

// Create a base pattern with shared attributes for cloning.
const patternId = getPatternId();
const basePattern = document.createElementNS(namespaces.svg, "pattern");
Expand Down Expand Up @@ -96,13 +139,7 @@ function waffleRender(y) {
.enter()
.append("path")
.attr("transform", y === "y" ? template`translate(${x0},${y0})` : template`translate(${y0},${x0})`)
.attr(
"d",
(i) =>
`M${wafflePoints(round(Y1[i] / unit), round(Y2[i] / unit), multiple)
.map(transform)
.join("L")}Z`
)
.attr("d", (i) => `M${polygon[i].join("L")}Z`)
.attr("fill", (i) => `url(#${patternId}-${i})`)
.attr("stroke", this.stroke == null ? null : (i) => `url(#${patternId}-${i})`)
.call(applyChannelStyles, this, {ariaLabel, href, title})
Expand Down Expand Up @@ -148,6 +185,8 @@ function waffleRender(y) {
// Waffles can also represent fractional intervals (e.g., 2.4–10.1). These
// require additional corner cuts, so the implementation below generates a few
// more points.
//
// The last point describes the centroid (used for pointing)
function wafflePoints(i1, i2, columns) {
if (i1 < 0 || i2 < 0) {
const k = Math.ceil(-Math.min(i1, i2) / columns); // shift negative to positive
Expand Down Expand Up @@ -177,9 +216,42 @@ function wafflePoints(i1, i2, columns) {
points.push([x2f, y2c]);
if (y2c > y1c) points.push([0, y2c]);
}
points.push(centroid(i1, i2, columns));
return points;
}

function centroid(i1, i2, columns) {
const r = Math.floor(i2 / columns) - Math.floor(i1 / columns);
return r === 0 // Single row
? singleRowCentroid(i1, i2, columns)
: // Two incomplete rows, use the midpoint of their overlap if they do, otherwise use the largest
r === 1
? Math.floor(i2 % columns) > Math.ceil(i1 % columns)
? [(Math.floor(i2 % columns) + Math.ceil(i1 % columns)) / 2, Math.floor(i2 / columns)]
: i2 % columns > columns - (i1 % columns)
? singleRowCentroid(i2 - (i2 % columns), i2, columns)
: singleRowCentroid(i1, columns * Math.ceil(i1 / columns), columns)
: // At least one full row, take the midpoint of all the rows that include the middle
[columns / 2, (Math.round(i1 / columns) + Math.round(i2 / columns)) / 2];
}

function singleRowCentroid(i1, i2, columns) {
const c = Math.floor(i2) - Math.floor(i1);
return c === 0 // Single cell
? [Math.floor(i1 % columns) + 0.5, Math.floor(i1 / columns) + (((i1 + i2) / 2) % 1)]
: c === 1 // Two incomplete cells, use the overlap if it is large enough, otherwise use the largest
? (i2 % 1) - (i1 % 1) > 0.5
? [Math.ceil(i1 % columns), Math.floor(i2 / columns) + ((i1 % 1) + (i2 % 1)) / 2]
: i2 % 1 > 1 - (i1 % 1)
? [Math.floor(i2 % columns) + 0.5, Math.floor(i2 / columns) + (i2 % 1) / 2]
: [Math.floor(i1 % columns) + 0.5, Math.floor(i1 / columns) + (1 + (i1 % 1)) / 2]
: // At least one full cell, take their midpoint
[
Math.ceil(i1 % columns) + Math.ceil(Math.floor(i2) - Math.ceil(i1)) / 2,
Math.floor(i1 / columns) + (i2 >= 1 + i1 ? 0.5 : ((i1 + i2) / 2) % 1)
];
}

function maybeRound(round) {
if (round === undefined || round === false) return Number;
if (round === true) return Math.round;
Expand All @@ -200,12 +272,12 @@ function spread(domain) {
return max - min;
}

export function waffleX(data, options = {}) {
export function waffleX(data, {tip, ...options} = {}) {
if (!hasXY(options)) options = {...options, y: indexOf, x2: identity};
return new WaffleX(data, maybeStackX(maybeIntervalX(maybeIdentityX(options))));
return new WaffleX(data, {tip, ...maybeStackX(maybeIntervalX(maybeIdentityX(options)))});
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What is this change doing? It’s not covered by tests, and I don’t notice any difference in manual testing.

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@mbostock mbostock Nov 21, 2024 •
edited
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Ah, so it’s removing the default behavior of the stack transform when the tip option is true, which is to use pointer: "y" on on waffleX, and pointer: "x" on waffleY. I get why you’re doing it, but I’m not sure it’s an improvement — in a way it makes things worse by having lots of dead space where the tip isn’t activated even though you’re hovering over a waffle; you need to be within 40px of the waffle centroid for it to activate, but it isn’t always obvious where that centroid is, and why the tip isn’t activating.

I wonder if this means we should set the maxRadius to Infinity for waffle marks (just so it’s clear that something is happening), or if it means the overall approach of choosing a single representative point for a mark is insufficient, and we need to supply the pointer transform with a full geometry so it can do e.g. a signed distance check.

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@mbostock mbostock Nov 21, 2024 •
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Perhaps another possibility is to change the pointer behavior when x (or y) is a band scale. But that’s a bit weird because the provided x here is already in screen space… (and the x scale may not even exist).

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I think setting maxRadius to infinity is the correct interim choice. But it would be neat to have a full geometry (both for geo and waffles) in the future.

Note that, for the geo mark, one thing that works well currently with a centroid-based pointer — and will be harder to solve with full geometry —, is to make "small countries" discoverable even when their shape is very small (islands are easy, the hard part is small countries surrounded by larger countries).

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Hmm, I’m not sure how we’d set maxRadius to Infinity for waffle marks. We can do it on the tip option for the derived tip, but that wouldn’t affect how the pointer transform behaves when applied to the waffle mark. 🤔 It kind of makes me think the waffle mark should supply a geometry channel, and then the pointer transform should compute the signed distance to the geometries… (That would also let us fix pointing at bars wider than 40px, too.)

}

export function waffleY(data, options = {}) {
export function waffleY(data, {tip, ...options} = {}) {
if (!hasXY(options)) options = {...options, x: indexOf, y2: identity};
return new WaffleY(data, maybeStackY(maybeIntervalY(maybeIdentityY(options))));
return new WaffleY(data, {tip, ...maybeStackY(maybeIntervalY(maybeIdentityY(options)))});
}
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