refactor(generation): drawCultures start

src/layers/renderers/drawCultures.ts

@@ -0,0 +1,41 @@
+import {connectVertices} from "scripts/connectVertices";
+
+export function drawCultures() {
+  /* uses */ const {cells, vertices, cultures} = pack;
+
+  cults.selectAll("path").remove(); // cleanup
+
+  const used = new Uint8Array(cells.i.length);
+  const paths = new Array(cultures.length).fill("");
+
+  for (const i of cells.i) {
+    if (!cells.culture[i]) continue;
+    if (used[i]) continue;
+    used[i] = 1;
+    const cultureId = cells.culture[i];
+    const onborder = cells.c[i].some(n => cells.culture[n] !== cultureId);
+    if (!onborder) continue;
+
+    const startingVertex = cells.v[i].find(v => vertices.c[v].some(i => cells.culture[i] !== cultureId));
+    if (startingVertex === undefined)
+      throw new Error(`Draw cultures: starting vertex for culture ${cultureId} is not found`);
+
+    const ofSameType = (cellId: number) => cells.culture[cellId] === cultureId;
+    const chain = connectVertices({vertices, startingVertex, ofSameType});
+
+    if (chain.length < 3) continue;
+    const points = chain.map(v => vertices.p[v]);
+
+    paths[cultureId] += "M" + points.join("L") + "Z";
+  }
+
+  const data = paths.map((p, i) => [p, i]).filter(d => d[0].length > 10);
+  cults
+    .selectAll("path")
+    .data(data)
+    .enter()
+    .append("path")
+    .attr("d", d => d[0])
+    .attr("fill", d => cultures[d[1]].color)
+    .attr("id", d => "culture" + d[1]);
+}