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Main #4068

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108 changes: 78 additions & 30 deletions 108 docs/getting-started.md
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Expand Up @@ -354,26 +354,41 @@ As [with React](#d3-in-react), you can use Svelte exclusively for rendering if y

:::code-group
```svelte [LinePlot.svelte]
<script>
<script lang="ts">
import * as d3 from 'd3';

export let data;
export let width = 640;
export let height = 400;
export let marginTop = 20;
export let marginRight = 20;
export let marginBottom = 20;
export let marginLeft = 20;

$: x = d3.scaleLinear([0, data.length - 1], [marginLeft, width - marginRight]);
$: y = d3.scaleLinear(d3.extent(data), [height - marginBottom, marginTop]);
$: line = d3.line((d, i) => x(i), y);
// Define props using $props()
const {
data,
width = 640,
height = 400,
marginTop = 20,
marginRight = 20,
marginBottom = 20,
marginLeft = 20,
} = $props();

// Replace reactive declarations ($:) with $derived()
const x = $derived(
d3.scaleLinear([0, data.length - 1], [marginLeft, width - marginRight])
);

const y = $derived(
d3.scaleLinear(d3.extent(data), [height - marginBottom, marginTop])
);

const line = $derived(
d3.line((d: number, i: number) => x(i), y)
);
</script>

<svg width={width} height={height}>
<path fill="none" stroke="currentColor" stroke-width="1.5" d={line(data)} />
<g fill="white" stroke="currentColor" stroke-width="1.5">
{#each data as d, i}
<circle key={i} cx={x(i)} cy={y(d)} r="2.5" />
{#key i}
<circle cx={x(i)} cy={y(d)} r="2.5" />
{/key}
{/each}
</g>
</svg>
Expand All @@ -382,34 +397,67 @@ As [with React](#d3-in-react), you can use Svelte exclusively for rendering if y

<p style="margin-top: -1em;"><a href="https://svelte.dev/repl/ece91c0d8b204d5ea970dbbc0d6783aa?version=3.59.1" style="font-size: smaller;" target="_blank">REPL ↗︎</a></p>

Svelte’s reactive statements (`$:`) pair nicely with D3 [data joins](./d3-selection/joining.md) for efficient updates. Below, we use them to render dynamic axes as the data changes.
Svelte’s reactive statements (`derived()`) pair nicely with D3 [data joins](./d3-selection/joining.md) for efficient updates. Below, we use them to render dynamic axes as the data changes.

:::code-group
```svelte [LinePlot.svelte]
<script>
import * as d3 from 'd3';
// Import the necessary runes from 'svelte/legacy'
import { $props, $derived, $effect, $state } from 'svelte/legacy';

// 1. Define Props using $props()
const {
data,
width = 640,
height = 400,
marginTop = 20,
marginRight = 20,
marginBottom = 30,
marginLeft = 40,
} = $props();

// 2. Define Element References using $state() and let
// The element references (gx, gy) must be defined with let
// so that bind:this can update them. They should be initialised with $state(undefined).
let gx = $state(undefined);
let gy = $state(undefined);

// 3. Replace Reactive Declarations ($:) with $derived()
const x = $derived(
d3.scaleLinear([0, data.length - 1], [marginLeft, width - marginRight])
);

const y = $derived(
d3.scaleLinear(d3.extent(data), [height - marginBottom, marginTop])
);

const line = $derived(
d3.line((d, i) => x(i), y)
);

export let data;
export let width = 640;
export let height = 400;
export let marginTop = 20;
export let marginRight = 20;
export let marginBottom = 30;
export let marginLeft = 40;

let gx;
let gy;

$: x = d3.scaleLinear([0, data.length - 1], [marginLeft, width - marginRight]);
$: y = d3.scaleLinear(d3.extent(data), [height - marginBottom, marginTop]);
$: line = d3.line((d, i) => x(i), y);
$: d3.select(gy).call(d3.axisLeft(y));
$: d3.select(gx).call(d3.axisBottom(x));
// 4. Replace Reactive Side Effects ($:) with $effect()
// $effect() runs the D3 code whenever the dependent values (gx, gy, x, or y) change.
$effect(() => {
// Check if the element references are defined before calling D3
if (gy) {
d3.select(gy).call(d3.axisLeft(y));
}
});

$effect(() => {
if (gx) {
d3.select(gx).call(d3.axisBottom(x));
}
});
</script>

<svg width={width} height={height}>
<g bind:this={gx} transform="translate(0,{height - marginBottom})" />
<g bind:this={gy} transform="translate({marginLeft},0)" />

<path fill="none" stroke="currentColor" stroke-width="1.5" d={line(data)} />

<g fill="white" stroke="currentColor" stroke-width="1.5">
{#each data as d, i}
<circle key={i} cx={x(i)} cy={y(d)} r="2.5" />
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