[#814,tutorial,docs][xl]: add initial version of the second tutorial, rename basic-example to learn-example, clean up learn-example

examples/learn-example/components/LineChart.tsx

@@ -0,0 +1,55 @@
+import VegaLite from "./VegaLite";
+
+export default function LineChart({
+  data = [],
+  fullWidth = false,
+  title = "",
+  xAxis = "x",
+  yAxis = "y",
+}) {
+  var tmp = data;
+  if (Array.isArray(data)) {
+    tmp = data.map((r, i) => {
+      return { x: r[0], y: r[1] };
+    });
+  }
+  const vegaData = { table: tmp };
+  const spec = {
+    $schema: "https://vega.github.io/schema/vega-lite/v5.json",
+    title,
+    width: "container",
+    height: 300,
+    mark: {
+      type: "line",
+      color: "black",
+      strokeWidth: 1,
+      tooltip: true,
+    },
+    data: {
+      name: "table",
+    },
+    selection: {
+      grid: {
+        type: "interval",
+        bind: "scales",
+      },
+    },
+    encoding: {
+      x: {
+        field: xAxis,
+        timeUnit: "year",
+        type: "temporal",
+      },
+      y: {
+        field: yAxis,
+        type: "quantitative",
+      },
+    },
+  };
+  if (typeof data === 'string') {
+    spec.data = { "url": data } as any
+    return <VegaLite fullWidth={fullWidth} spec={spec} />;
+  }
+
+  return <VegaLite fullWidth={fullWidth} data={vegaData} spec={spec} />;
+}