ADD - add camera zoom levels

frontend/src/utils/gameView.test.ts

@@ -1,10 +1,11 @@
 import { describe, expect, it } from 'vitest'
 
-import { coverTextureCoordinates } from '@/utils/gameView'
+import { gameViewGeometry } from '@/utils/gameView'
 
-describe('coverTextureCoordinates', () => {
+describe('gameViewGeometry', () => {
   it('center-crops a widescreen game view for 3:4 portrait output', () => {
-    expect(Array.from(coverTextureCoordinates(1920, 1080, 540, 720))).toEqual([
+    const geometry = gameViewGeometry(1920, 1080, 540, 720)
+    expect(Array.from(geometry.textureCoordinates)).toEqual([
       expect.closeTo(0.29, 2),
       0,
       expect.closeTo(0.71, 2),
@@ -17,14 +18,45 @@ describe('coverTextureCoordinates', () => {
   })
 
   it('keeps the full game view for 16:9 landscape output', () => {
-    expect(Array.from(coverTextureCoordinates(1920, 1080, 720, 405))).toEqual([
+    const geometry = gameViewGeometry(1920, 1080, 720, 405)
+    expect(Array.from(geometry.textureCoordinates)).toEqual([
       0, 0, 1, 0, 0, 1, 1, 1,
     ])
   })
 
   it('keeps the full texture when both aspect ratios match', () => {
-    expect(Array.from(coverTextureCoordinates(1600, 900, 800, 450))).toEqual([
+    const geometry = gameViewGeometry(1600, 900, 800, 450)
+    expect(Array.from(geometry.textureCoordinates)).toEqual([
       0, 0, 1, 0, 0, 1, 1, 1,
     ])
   })
+
+  it('uses the tablet camera zoom levels around the crop center', () => {
+    const wideGeometry = gameViewGeometry(1920, 1080, 540, 720, 0.5)
+    expect(Array.from(wideGeometry.textureCoordinates)).toEqual([
+      expect.closeTo(0.08, 2),
+      0,
+      expect.closeTo(0.92, 2),
+      0,
+      expect.closeTo(0.08, 2),
+      1,
+      expect.closeTo(0.92, 2),
+      1,
+    ])
+    expect(Array.from(wideGeometry.positions)).toEqual([
+      -1, -0.5, 1, -0.5, -1, 0.5, 1, 0.5,
+    ])
+
+    const zoomedGeometry = gameViewGeometry(1920, 1080, 540, 720, 2)
+    expect(Array.from(zoomedGeometry.textureCoordinates)).toEqual([
+      expect.closeTo(0.39, 2),
+      0.25,
+      expect.closeTo(0.61, 2),
+      0.25,
+      expect.closeTo(0.39, 2),
+      0.75,
+      expect.closeTo(0.61, 2),
+      0.75,
+    ])
+  })
 })