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

packages/element/tests/textElement.test.ts

@@ -0,0 +1,379 @@
+import { getLineHeight } from "@excalidraw/common";
+import { API } from "@excalidraw/excalidraw/tests/helpers/api";
+
+import { FONT_FAMILY, TEXT_ALIGN, VERTICAL_ALIGN } from "@excalidraw/common";
+
+import {
+  computeContainerDimensionForBoundText,
+  getContainerCoords,
+  getBoundTextMaxWidth,
+  getBoundTextMaxHeight,
+  computeBoundTextPosition,
+} from "../src/textElement";
+import { detectLineHeight, getLineHeightInPx } from "../src/textMeasurements";
+
+import type { ExcalidrawTextElementWithContainer } from "../src/types";
+
+describe("Test measureText", () => {
+  describe("Test getContainerCoords", () => {
+    const params = { width: 200, height: 100, x: 10, y: 20 };
+
+    it("should compute coords correctly when ellipse", () => {
+      const element = API.createElement({
+        type: "ellipse",
+        ...params,
+      });
+      expect(getContainerCoords(element)).toEqual({
+        x: 44.2893218813452455,
+        y: 39.64466094067262,
+      });
+    });
+
+    it("should compute coords correctly when rectangle", () => {
+      const element = API.createElement({
+        type: "rectangle",
+        ...params,
+      });
+      expect(getContainerCoords(element)).toEqual({
+        x: 15,
+        y: 25,
+      });
+    });
+
+    it("should compute coords correctly when diamond", () => {
+      const element = API.createElement({
+        type: "diamond",
+        ...params,
+      });
+      expect(getContainerCoords(element)).toEqual({
+        x: 65,
+        y: 50,
+      });
+    });
+  });
+
+  describe("Test computeContainerDimensionForBoundText", () => {
+    const params = {
+      width: 178,
+      height: 194,
+    };
+
+    it("should compute container height correctly for rectangle", () => {
+      const element = API.createElement({
+        type: "rectangle",
+        ...params,
+      });
+      expect(computeContainerDimensionForBoundText(150, element.type)).toEqual(
+        160,
+      );
+    });
+
+    it("should compute container height correctly for ellipse", () => {
+      const element = API.createElement({
+        type: "ellipse",
+        ...params,
+      });
+      expect(computeContainerDimensionForBoundText(150, element.type)).toEqual(
+        226,
+      );
+    });
+
+    it("should compute container height correctly for diamond", () => {
+      const element = API.createElement({
+        type: "diamond",
+        ...params,
+      });
+      expect(computeContainerDimensionForBoundText(150, element.type)).toEqual(
+        320,
+      );
+    });
+  });
+
+  describe("Test getBoundTextMaxWidth", () => {
+    const params = {
+      width: 178,
+      height: 194,
+    };
+
+    it("should return max width when container is rectangle", () => {
+      const container = API.createElement({ type: "rectangle", ...params });
+      expect(getBoundTextMaxWidth(container, null)).toBe(168);
+    });
+
+    it("should return max width when container is ellipse", () => {
+      const container = API.createElement({ type: "ellipse", ...params });
+      expect(getBoundTextMaxWidth(container, null)).toBe(116);
+    });
+
+    it("should return max width when container is diamond", () => {
+      const container = API.createElement({ type: "diamond", ...params });
+      expect(getBoundTextMaxWidth(container, null)).toBe(79);
+    });
+  });
+
+  describe("Test getBoundTextMaxHeight", () => {
+    const params = {
+      width: 178,
+      height: 194,
+      id: '"container-id',
+    };
+
+    const boundTextElement = API.createElement({
+      type: "text",
+      id: "text-id",
+      x: 560.51171875,
+      y: 202.033203125,
+      width: 154,
+      height: 175,
+      fontSize: 20,
+      fontFamily: 1,
+      text: "Excalidraw is a\nvirtual \nopensource \nwhiteboard for \nsketching \nhand-drawn like\ndiagrams",
+      textAlign: "center",
+      verticalAlign: "middle",
+      containerId: params.id,
+    }) as ExcalidrawTextElementWithContainer;
+
+    it("should return max height when container is rectangle", () => {
+      const container = API.createElement({ type: "rectangle", ...params });
+      expect(getBoundTextMaxHeight(container, boundTextElement)).toBe(184);
+    });
+
+    it("should return max height when container is ellipse", () => {
+      const container = API.createElement({ type: "ellipse", ...params });
+      expect(getBoundTextMaxHeight(container, boundTextElement)).toBe(127);
+    });
+
+    it("should return max height when container is diamond", () => {
+      const container = API.createElement({ type: "diamond", ...params });
+      expect(getBoundTextMaxHeight(container, boundTextElement)).toBe(87);
+    });
+
+    it("should return max height when container is arrow", () => {
+      const container = API.createElement({
+        type: "arrow",
+        ...params,
+      });
+      expect(getBoundTextMaxHeight(container, boundTextElement)).toBe(194);
+    });
+
+    it("should return max height when container is arrow and height is less than threshold", () => {
+      const container = API.createElement({
+        type: "arrow",
+        ...params,
+        height: 70,
+        boundElements: [{ type: "text", id: "text-id" }],
+      });
+
+      expect(getBoundTextMaxHeight(container, boundTextElement)).toBe(
+        boundTextElement.height,
+      );
+    });
+  });
+});
+
+const textElement = API.createElement({
+  type: "text",
+  text: "Excalidraw is a\nvirtual \nopensource \nwhiteboard for \nsketching \nhand-drawn like\ndiagrams",
+  fontSize: 20,
+  fontFamily: 1,
+  height: 175,
+});
+
+describe("Test detectLineHeight", () => {
+  it("should return correct line height", () => {
+    expect(detectLineHeight(textElement)).toBe(1.25);
+  });
+});
+
+describe("Test getLineHeightInPx", () => {
+  it("should return correct line height", () => {
+    expect(
+      getLineHeightInPx(textElement.fontSize, textElement.lineHeight),
+    ).toBe(25);
+  });
+});
+
+describe("Test getDefaultLineHeight", () => {
+  it("should return line height using default font family when not passed", () => {
+    //@ts-ignore
+    expect(getLineHeight()).toBe(1.25);
+  });
+
+  it("should return line height using default font family for unknown font", () => {
+    const UNKNOWN_FONT = 5;
+    expect(getLineHeight(UNKNOWN_FONT)).toBe(1.25);
+  });
+
+  it("should return correct line height", () => {
+    expect(getLineHeight(FONT_FAMILY.Cascadia)).toBe(1.2);
+  });
+});
+
+describe("Test computeBoundTextPosition", () => {
+  const createMockElementsMap = () => new Map();
+
+  // Helper function to create rectangle test case with 90-degree rotation
+  const createRotatedRectangleTestCase = (
+    textAlign: string,
+    verticalAlign: string,
+  ) => {
+    const container = API.createElement({
+      type: "rectangle",
+      x: 100,
+      y: 100,
+      width: 200,
+      height: 100,
+      angle: (Math.PI / 2) as any, // 90 degrees
+    });
+
+    const boundTextElement = API.createElement({
+      type: "text",
+      width: 80,
+      height: 40,
+      text: "hello darkness my old friend",
+      textAlign: textAlign as any,
+      verticalAlign: verticalAlign as any,
+      containerId: container.id,
+    }) as ExcalidrawTextElementWithContainer;
+
+    const elementsMap = createMockElementsMap();
+
+    return { container, boundTextElement, elementsMap };
+  };
+
+  describe("90-degree rotation with all alignment combinations", () => {
+    // Test all 9 combinations of horizontal (left, center, right) and vertical (top, middle, bottom) alignment
+
+    it("should position text with LEFT + TOP alignment at 90-degree rotation", () => {
+      const { container, boundTextElement, elementsMap } =
+        createRotatedRectangleTestCase(TEXT_ALIGN.LEFT, VERTICAL_ALIGN.TOP);
+
+      const result = computeBoundTextPosition(
+        container,
+        boundTextElement,
+        elementsMap,
+      );
+
+      expect(result.x).toBeCloseTo(185, 1);
+      expect(result.y).toBeCloseTo(75, 1);
+    });
+
+    it("should position text with LEFT + MIDDLE alignment at 90-degree rotation", () => {
+      const { container, boundTextElement, elementsMap } =
+        createRotatedRectangleTestCase(TEXT_ALIGN.LEFT, VERTICAL_ALIGN.MIDDLE);
+
+      const result = computeBoundTextPosition(
+        container,
+        boundTextElement,
+        elementsMap,
+      );
+
+      expect(result.x).toBeCloseTo(160, 1);
+      expect(result.y).toBeCloseTo(75, 1);
+    });
+
+    it("should position text with LEFT + BOTTOM alignment at 90-degree rotation", () => {
+      const { container, boundTextElement, elementsMap } =
+        createRotatedRectangleTestCase(TEXT_ALIGN.LEFT, VERTICAL_ALIGN.BOTTOM);
+
+      const result = computeBoundTextPosition(
+        container,
+        boundTextElement,
+        elementsMap,
+      );
+
+      expect(result.x).toBeCloseTo(135, 1);
+      expect(result.y).toBeCloseTo(75, 1);
+    });
+
+    it("should position text with CENTER + TOP alignment at 90-degree rotation", () => {
+      const { container, boundTextElement, elementsMap } =
+        createRotatedRectangleTestCase(TEXT_ALIGN.CENTER, VERTICAL_ALIGN.TOP);
+
+      const result = computeBoundTextPosition(
+        container,
+        boundTextElement,
+        elementsMap,
+      );
+
+      expect(result.x).toBeCloseTo(185, 1);
+      expect(result.y).toBeCloseTo(130, 1);
+    });
+
+    it("should position text with CENTER + MIDDLE alignment at 90-degree rotation", () => {
+      const { container, boundTextElement, elementsMap } =
+        createRotatedRectangleTestCase(
+          TEXT_ALIGN.CENTER,
+          VERTICAL_ALIGN.MIDDLE,
+        );
+
+      const result = computeBoundTextPosition(
+        container,
+        boundTextElement,
+        elementsMap,
+      );
+
+      expect(result.x).toBeCloseTo(160, 1);
+      expect(result.y).toBeCloseTo(130, 1);
+    });
+
+    it("should position text with CENTER + BOTTOM alignment at 90-degree rotation", () => {
+      const { container, boundTextElement, elementsMap } =
+        createRotatedRectangleTestCase(
+          TEXT_ALIGN.CENTER,
+          VERTICAL_ALIGN.BOTTOM,
+        );
+
+      const result = computeBoundTextPosition(
+        container,
+        boundTextElement,
+        elementsMap,
+      );
+
+      expect(result.x).toBeCloseTo(135, 1);
+      expect(result.y).toBeCloseTo(130, 1);
+    });
+
+    it("should position text with RIGHT + TOP alignment at 90-degree rotation", () => {
+      const { container, boundTextElement, elementsMap } =
+        createRotatedRectangleTestCase(TEXT_ALIGN.RIGHT, VERTICAL_ALIGN.TOP);
+
+      const result = computeBoundTextPosition(
+        container,
+        boundTextElement,
+        elementsMap,
+      );
+
+      expect(result.x).toBeCloseTo(185, 1);
+      expect(result.y).toBeCloseTo(185, 1);
+    });
+
+    it("should position text with RIGHT + MIDDLE alignment at 90-degree rotation", () => {
+      const { container, boundTextElement, elementsMap } =
+        createRotatedRectangleTestCase(TEXT_ALIGN.RIGHT, VERTICAL_ALIGN.MIDDLE);
+
+      const result = computeBoundTextPosition(
+        container,
+        boundTextElement,
+        elementsMap,
+      );
+
+      expect(result.x).toBeCloseTo(160, 1);
+      expect(result.y).toBeCloseTo(185, 1);
+    });
+
+    it("should position text with RIGHT + BOTTOM alignment at 90-degree rotation", () => {
+      const { container, boundTextElement, elementsMap } =
+        createRotatedRectangleTestCase(TEXT_ALIGN.RIGHT, VERTICAL_ALIGN.BOTTOM);
+
+      const result = computeBoundTextPosition(
+        container,
+        boundTextElement,
+        elementsMap,
+      );
+
+      expect(result.x).toBeCloseTo(135, 1);
+      expect(result.y).toBeCloseTo(185, 1);
+    });
+  });
+});