diff --git a/B07_DesignDetail/openwebcad/src/drawControllers/screenCanvas.drawController.test.ts b/B07_DesignDetail/openwebcad/src/drawControllers/screenCanvas.drawController.test.ts
new file mode 100644
index 00000000..bad08fe9
--- /dev/null
+++ b/B07_DesignDetail/openwebcad/src/drawControllers/screenCanvas.drawController.test.ts
@@ -0,0 +1,39 @@
+import { Point } from '@flatten-js/core';
+import { describe, expect, it } from 'vitest';
+import { ScreenCanvasDrawController } from './screenCanvas.drawController';
+
+/** translate·drawImage 인자만 기록하는 최소 2d 컨텍스트. */
+function recordingContext() {
+	const calls: { translate: number[][]; rotate: number[]; image: number[] } = {
+		translate: [],
+		rotate: [],
+		image: [],
+	};
+	const context = {
+		translate: (x: number, y: number) => calls.translate.push([x, y]),
+		rotate: (a: number) => calls.rotate.push(a),
+		drawImage: (_img: unknown, ...rest: number[]) => calls.image.push(...rest),
+	} as unknown as CanvasRenderingContext2D;
+	return { context, calls };
+}
+
+describe('ScreenCanvasDrawController.drawImage', () => {
+	it('그림 중심은 선·글자와 같은 뒤집힌 y 자리에 놓인다', () => {
+		const { context, calls } = recordingContext();
+		const controller = new ScreenCanvasDrawController(context);
+		controller.setCanvasSize(new Point(800, 600));
+		controller.setScreenOffset(new Point(0, 0));
+		// 세계 (10,-20)~(42,-4) 상자 — 도각 로고 자리처럼 원점 아래.
+		controller.drawImage({} as HTMLImageElement, 10, -20, 32, 16, 0);
+		const center = controller.worldToTarget(new Point(26, -12));
+		expect(calls.translate[0]).toEqual([center.x, 600 - center.y]);
+		expect(calls.image).toEqual([-16, -8, 32, 16]);
+	});
+
+	it('회전은 y 뒤집기에 맞춰 부호를 바꾸고 원상 복구한다', () => {
+		const { context, calls } = recordingContext();
+		const controller = new ScreenCanvasDrawController(context);
+		controller.drawImage({} as HTMLImageElement, 0, 0, 4, 2, 0.5);
+		expect(calls.rotate).toEqual([-0.5, 0.5]);
+	});
+});
diff --git a/B07_DesignDetail/openwebcad/src/drawControllers/screenCanvas.drawController.ts b/B07_DesignDetail/openwebcad/src/drawControllers/screenCanvas.drawController.ts
index efaa8a31..4facbdbd 100644
--- a/B07_DesignDetail/openwebcad/src/drawControllers/screenCanvas.drawController.ts
+++ b/B07_DesignDetail/openwebcad/src/drawControllers/screenCanvas.drawController.ts
@@ -603,11 +603,13 @@ export class ScreenCanvasDrawController implements DrawController {
 		const screenHeight = height * this.screenScale;
 		const screenCenter = this.worldToTarget(new Point(xMin + width / 2, yMin + height / 2));
 		const screenCenterX = screenCenter.x;
-		const screenCenterY = screenCenter.y;
+		// 다른 그리기와 같이 y 를 뒤집는다 — worldToTarget 은 수학 좌표(위가 +y)라 그대로
+		// 쓰면 그림이 거울상 자리(캔버스 밖)에 놓여 화면에 안 보인다(2026-09-02 도각 로고).
+		const screenCenterY = this.canvasSize.y - screenCenter.y;
 
-		// Rotate and translate context
+		// Rotate and translate context (y 를 뒤집었으니 회전 방향도 반대)
 		this.context.translate(screenCenterX, screenCenterY);
-		this.context.rotate(angle);
+		this.context.rotate(-angle);
 
 		// Draw image
 		this.context.drawImage(
@@ -619,7 +621,7 @@ export class ScreenCanvasDrawController implements DrawController {
 		);
 
 		// Reset context
-		this.context.rotate(-angle);
+		this.context.rotate(angle);
 		this.context.translate(-screenCenterX, -screenCenterY);
 	}