Implementation and tests for vectorGrid() helper.

frontend/farm_designer/plants/grid/__tests__/generate_grid_test.ts

@@ -0,0 +1,37 @@
+import { vectorGrid } from "../generate_grid";
+
+describe("vectorGrid", () => {
+  it("handles zeros (edge case)", () => {
+    const results = vectorGrid({
+      startX: 0,
+      startY: 0,
+      spacingH: 0,
+      spacingV: 0,
+      numPlantsH: 0,
+      numPlantsV: 0,
+    });
+    expect(results).toEqual([]);
+  });
+
+  it("generates a grid", () => {
+    const p = { // Prime numbers yeah
+      startX: 11,
+      startY: 31,
+      spacingH: 5,
+      spacingV: 7,
+      numPlantsH: 2,
+      numPlantsV: 3
+    };
+    const results = vectorGrid(p);
+    expect(results.length).toEqual(p.numPlantsH * p.numPlantsV);
+    const expected = JSON.stringify([
+      [11, 31],
+      [11, 38],
+      [11, 45],
+      [16, 31],
+      [16, 38],
+      [16, 45]
+    ]);
+    expect(JSON.stringify(results)).toEqual(expected);
+  });
+});

frontend/farm_designer/plants/grid/constants.ts

@@ -1,9 +1,11 @@
 export type PlantGridKey =
   "startX" | "startY" | "spacingH" | "spacingV" | "numPlantsH" | "numPlantsV";
 
+export type PlantGridData = Record<PlantGridKey, number>;
+
 export interface PlantGridState {
   status: "clean" | "dirty",
-  grid: Record<PlantGridKey, number>;
+  grid: PlantGridData;
 }
 
 export interface PlantGridProps {

frontend/farm_designer/plants/grid/generate_grid.ts

@@ -0,0 +1,24 @@
+import { TaggedPlant } from "../../map/interfaces";
+import { PlantGridData } from "./constants";
+import { range } from "lodash";
+
+export function vectorGrid(params: PlantGridData): [number, number][] {
+  const rows = range(params.startX,
+    params.startX + (params.numPlantsH * params.spacingH),
+    params.spacingH);
+
+  const cols = range(params.startY,
+    params.startY + (params.numPlantsV * params.spacingV),
+    params.spacingV);
+
+  const results: [number, number][] = [];
+
+  rows.map(x => cols.map(y => results.push([x, y])));
+
+  return results;
+}
+
+export function initPlantGrid(_params: PlantGridData): TaggedPlant[] {
+  const output: TaggedPlant[] = [];
+  return output;
+}