Barchart dynamic height example (#763)

* fix for empty layers toggle showing small circle

* Barchart dynamic height example

Author: cycle4passion

docs/src/examples/components/BarChart/dynamic-height.svelte

@@ -0,0 +1,56 @@
+<script>
+	import { BarChart, defaultChartPadding } from 'layerchart';
+
+	let data2 = [
+		{ name: 'One', value1: 10, value2: 20 },
+		{ name: 'Two', value1: 5, value2: 20 }
+	];
+
+	let data4 = [
+		{ name: 'One', value1: 10, value2: 20 },
+		{ name: 'Two', value1: 5, value2: 20 },
+		{ name: 'Three', value1: 15, value2: 15 },
+		{ name: 'Four', value1: 10, value2: 5 }
+	];
+
+	let data6 = [
+		{ name: 'One', value1: 10, value2: 20 },
+		{ name: 'Two', value1: 5, value2: 20 },
+		{ name: 'Three', value1: 15, value2: 15 },
+		{ name: 'Four', value1: 10, value2: 5 },
+		{ name: 'Five', value1: 8, value2: 5 },
+		{ name: 'Size', value1: 3, value2: 5 }
+	];
+
+	let seriesCount = $state(2);
+	let data = $derived(seriesCount === 2 ? data2 : seriesCount === 4 ? data4 : data6);
+
+	let barHeight = 50;
+	let padding = { top: 4, bottom: 20 };
+	let bandPadding = 0.4;
+	let chartHeight = $derived(
+		(barHeight + barHeight * bandPadding) * seriesCount +
+			barHeight * bandPadding +
+			padding.top +
+			padding.bottom +
+			8
+	);
+</script>
+
+<label><input bind:group={seriesCount} type="radio" value={2} /> 2</label>
+<label><input bind:group={seriesCount} type="radio" value={4} /> 4</label>
+<label><input bind:group={seriesCount} type="radio" value={6} /> 6</label>
+
+<BarChart
+	{data}
+	{bandPadding}
+	y="name"
+	series={[
+		{ key: 'value1', color: 'hsl(100 100% 50%)' },
+		{ key: 'value2', color: 'hsl(200 100% 50%)' }
+	]}
+	orientation="horizontal"
+	seriesLayout="stackExpand"
+	padding={defaultChartPadding({ left: 20 })}
+	height={chartHeight}
+/>