Create a sprite asset from a texture's context menu

The sprite takes the whole image at its pixel size and the texture's name,
numbered like any other clash. CreateAssetCommand now accepts starting
properties; they go through the schema in execute, so an unknown key or a
bad value is refused before the project is touched, and one undo removes
the asset.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

tests/core/aspect.test.ts

@@ -6,6 +6,7 @@ import {
   fitAxisToAspect,
   matchesAspect,
   matchesPixelSize,
+  spriteFromTexture,
   texturePixelSize,
 } from '../../src/core/properties/aspect';
 import { makeSpriteScene } from '../helpers';
@@ -97,3 +98,19 @@ describe('matchesAspect', () => {
     expect(matchesAspect(size, props({ width: Number.NaN, height: 10 }))).toBe(false);
   });
 });
+
+describe('spriteFromTexture', () => {
+  it('wears the texture at its pixel size', () => {
+    const sheet = makeSheet();
+    expect(spriteFromTexture(sheet.project, sheet.textureId)).toEqual({
+      texture: sheet.textureId,
+      width: 64,
+      height: 48,
+    });
+  });
+
+  it('leaves the size to the defaults while the image has not been measured', () => {
+    const sheet = makeSheet(0, 0);
+    expect(spriteFromTexture(sheet.project, sheet.textureId)).toEqual({ texture: sheet.textureId });
+  });
+});

tests/core/texture-commands.test.ts

@@ -1,8 +1,9 @@
 import { describe, expect, it } from 'vitest';
-import { CreateTextureCommand } from '../../src/core/commands/assetCommands';
+import { CreateAssetCommand, CreateTextureCommand } from '../../src/core/commands/assetCommands';
 import { CommandError } from '../../src/core/commands/Command';
 import { isTextureAsset } from '../../src/core/model/Asset';
 import { findAsset } from '../../src/core/model/Project';
+import { spriteFromTexture } from '../../src/core/properties/aspect';
 import { makeProject } from '../helpers';
 
 const FILE = `${'b'.repeat(64)}.webp`;
@@ -40,3 +41,38 @@ describe('CreateTextureCommand', () => {
     expect(new Set(project.assets.map((a) => a.id)).size).toBe(2);
   });
 });
+
+describe('CreateAssetCommand with starting props', () => {
+  it('creates a sprite wearing the texture at its pixel size, and removes it again', () => {
+    const { project, stack } = makeProject();
+    const texture = new CreateTextureCommand('Hero', { file: FILE, width: 64, height: 32 });
+    stack.execute(texture);
+    const sprite = new CreateAssetCommand('sprite', 'Hero 2', spriteFromTexture(project, texture.asset.id));
+    stack.execute(sprite);
+
+    expect(findAsset(project, sprite.asset.id)?.props).toEqual({
+      enabled: true,
+      width: 64,
+      height: 32,
+      color: 0xffffff,
+      texture: texture.asset.id,
+    });
+    stack.undo();
+    expect(findAsset(project, sprite.asset.id)).toBeUndefined();
+    stack.redo();
+    expect(findAsset(project, sprite.asset.id)?.props.texture).toBe(texture.asset.id);
+  });
+
+  it('passes each value through the schema', () => {
+    const { project, stack } = makeProject();
+    const sprite = new CreateAssetCommand('sprite', 'Tiny', { width: -5 });
+    stack.execute(sprite);
+    expect(findAsset(project, sprite.asset.id)?.props.width).toBe(1);
+  });
+
+  it('rejects a property the type does not have, leaving the project untouched', () => {
+    const { project, stack } = makeProject();
+    expect(() => stack.execute(new CreateAssetCommand('sprite', 'Odd', { zoom: 2 }))).toThrow(CommandError);
+    expect(project.assets).toHaveLength(0);
+  });
+});