snapshot of https://github.com/excalidraw/excalidraw.git (master, 2026-09-16; blobs > 131072B omitted)

packages/excalidraw/charts/charts.radar.ts

@@ -0,0 +1,199 @@
+import { pointFrom } from "@excalidraw/math";
+
+import {
+  FONT_FAMILY,
+  FONT_SIZES,
+  getFontString,
+  getLineHeight,
+  ROUGHNESS,
+} from "@excalidraw/common";
+
+import {
+  measureText,
+  newLinearElement,
+  newTextElement,
+} from "@excalidraw/element";
+
+import type { LocalPoint } from "@excalidraw/math";
+
+import {
+  BAR_GAP,
+  BAR_HEIGHT,
+  GRID_OPACITY,
+  RADAR_GRID_LEVELS,
+  RADAR_LABEL_OFFSET,
+  commonProps,
+} from "./charts.constants";
+import {
+  createRadarAxisLabels,
+  createSeriesLegend,
+  getBackgroundColor,
+  getColorOffset,
+  getRadarDimensions,
+  getRadarDisplayText,
+  getRadarValueScale,
+  getSeriesColors,
+  isSpreadsheetValidForChartType,
+} from "./charts.helpers";
+
+import type { ChartElements, Spreadsheet } from "./charts.types";
+
+export const renderRadarChart = (
+  spreadsheet: Spreadsheet,
+  x: number,
+  y: number,
+  colorSeed?: number,
+): ChartElements | null => {
+  if (!isSpreadsheetValidForChartType(spreadsheet, "radar")) {
+    return null;
+  }
+
+  const labels =
+    spreadsheet.labels ??
+    spreadsheet.series[0].values.map((_, index) => `Value ${index + 1}`);
+
+  const series = spreadsheet.series;
+  const { normalize, renderSteps } = getRadarValueScale(series, labels.length);
+  const colorOffset = getColorOffset(colorSeed);
+  const backgroundColor = getBackgroundColor(colorOffset);
+  const seriesColors = getSeriesColors(series.length, colorOffset);
+  const { chartWidth, chartHeight } = getRadarDimensions();
+  const centerX = x + chartWidth / 2;
+  const centerY = y - chartHeight / 2;
+  const radius = BAR_HEIGHT / 2;
+  const angles = labels.map(
+    (_, index) => -Math.PI / 2 + (Math.PI * 2 * index) / labels.length,
+  );
+
+  const { axisLabels, axisLabelTopY, axisLabelBottomY } = createRadarAxisLabels(
+    labels,
+    angles,
+    centerX,
+    centerY,
+    radius,
+    backgroundColor,
+  );
+
+  const titleFontFamily = FONT_FAMILY["Lilita One"];
+  const titleFontSize = FONT_SIZES.xl;
+  const titleLineHeight = getLineHeight(titleFontFamily);
+  const titleFontString = getFontString({
+    fontFamily: titleFontFamily,
+    fontSize: titleFontSize,
+  });
+  const titleText = spreadsheet.title
+    ? getRadarDisplayText(
+        spreadsheet.title,
+        titleFontString,
+        chartWidth + RADAR_LABEL_OFFSET * 2,
+      )
+    : null;
+  const titleTextMetrics = titleText
+    ? measureText(titleText, titleFontString, titleLineHeight)
+    : null;
+  const title = titleText
+    ? newTextElement({
+        backgroundColor,
+        ...commonProps,
+        text: titleText,
+        originalText: spreadsheet.title ?? titleText,
+        x: x + chartWidth / 2,
+        y: axisLabelTopY - RADAR_LABEL_OFFSET - titleTextMetrics!.height / 2,
+        fontFamily: titleFontFamily,
+        fontSize: titleFontSize,
+        lineHeight: titleLineHeight,
+        textAlign: "center",
+      })
+    : null;
+
+  const radarGridLines = renderSteps
+    ? Array.from({ length: RADAR_GRID_LEVELS }, (_, levelIndex) => {
+        const levelRatio = (levelIndex + 1) / RADAR_GRID_LEVELS;
+        const levelRadius = radius * levelRatio;
+        const points = angles.map((angle) =>
+          pointFrom<LocalPoint>(
+            Math.cos(angle) * levelRadius,
+            Math.sin(angle) * levelRadius,
+          ),
+        );
+        points.push(pointFrom(points[0][0], points[0][1]));
+
+        return newLinearElement({
+          backgroundColor: "transparent",
+          ...commonProps,
+          type: "line",
+          x: centerX,
+          y: centerY,
+          width: levelRadius * 2,
+          height: levelRadius * 2,
+          strokeStyle: "solid",
+          roughness: ROUGHNESS.architect,
+          opacity: GRID_OPACITY,
+          polygon: true,
+          points,
+        });
+      })
+    : [];
+
+  const spokes = angles.map((angle) => {
+    const px = Math.cos(angle) * radius;
+    const py = Math.sin(angle) * radius;
+    return newLinearElement({
+      backgroundColor: "transparent",
+      ...commonProps,
+      type: "line",
+      x: centerX,
+      y: centerY,
+      width: Math.abs(px),
+      height: Math.abs(py),
+      strokeStyle: "solid",
+      roughness: ROUGHNESS.architect,
+      opacity: GRID_OPACITY,
+      points: [pointFrom(0, 0), pointFrom(px, py)],
+    });
+  });
+
+  const seriesPolygons = series.map((seriesData, index) => {
+    const points = angles.map((angle, axisIndex) => {
+      const value = seriesData.values[axisIndex] ?? 0;
+      const pointRadius = normalize(value, axisIndex) * radius;
+      return pointFrom<LocalPoint>(
+        Math.cos(angle) * pointRadius,
+        Math.sin(angle) * pointRadius,
+      );
+    });
+    points.push(pointFrom(points[0][0], points[0][1]));
+
+    return newLinearElement({
+      backgroundColor: "transparent",
+      ...commonProps,
+      type: "line",
+      x: centerX,
+      y: centerY,
+      width: radius * 2,
+      height: radius * 2,
+      strokeColor: seriesColors[index],
+      strokeWidth: 2,
+      polygon: true,
+      points,
+    });
+  });
+
+  const seriesLegend = createSeriesLegend(
+    series,
+    seriesColors,
+    centerX,
+    axisLabelBottomY,
+    y + BAR_GAP * 5,
+    backgroundColor,
+  );
+
+  return [
+    ...(title ? [title] : []),
+    ...axisLabels,
+    ...radarGridLines,
+    ...spokes,
+    ...seriesPolygons,
+    ...seriesLegend,
+  ];
+};