[obiot]

Follow-up to #1759. Six Tiled fixes, every one checked against Tiled's own renderer (tmxrasterizer, Tiled 1.12.1) rather than against numbers worked out by hand.

Fixes

• Resized tile objects: an object resized in Tiled keeps its size, its tile stretched to fill it, and collides at that size. From a tileset image it was drawn and collided at the tile's size (reported in Place tile objects on isometric maps where Tiled draws them #1759).
• objectalignment: tile objects are placed by their tileset's object alignment. They were always anchored at the bottom left, or the bottom center on isometric maps.
• Image-collection tile objects, resized or flipped: drawn on their box. Their sprite kept a centered anchor (the rotation branch ran for a rotation of 0), so the scale and flip, applied about the top left, pushed a resized one up and left and a flipped one a whole width to the right.
• Rotated tile objects: turn about their alignment point, as in Tiled, sprite and body alike. They turned about their top left (a centered anchor for collections). alignTileObject moves the top left by a - R·a, so neither transform changes.
• Animated tile objects: load and play. From a tileset image, addAnimation refused the string frame names (string parameters for addAnimation are not allowed for standard spritesheet based Texture); frames are now named by position. An image collection had no texture (TypeError); TMXTileset#getAnimationTexture() builds one canvas atlas holding its animation frames.
• Tile layers, image collections of mixed heights: each tile sits on the bottom of its cell. With tilerendersize="tile" every tile was placed as if it were as tall as the tallest image. Collections always use the CPU path, so the fix covers every renderer.

All of these are released behaviour except the objectalignment support, which is new.

Verification

• Against Tiled's render: 16 maps (orthogonal, isometric 2:1 and 64x40, Kenney's isometric landscape art as an image collection, rotated, animated, flipped layers) rendered by tmxrasterizer and by melonJS on the same TMX, then pixel-diffed. Non-rotated objects and every tile layer match pixel for pixel; master differs on roughly every drawn pixel and fails to load both animated maps. Animation frame 1 matches Tiled advanced past frame 0.
• Geometry: melonJS's own transform (pos + currentTransform) puts 125 points on 19 objects within 5.6e-6 px of Tiled's placement rules. Rendered rotated objects land within 0.51 px with subPixel on (Tiled's own render is within 0.37 px of the rules); the remaining edge differences are the two rasterizers sampling a rotated image.
• Tests: new specs in tmxtilemap.spec.js and tmxrenderer.spec.js; 18 mutations (each fix reverted on its own) all fail at least one test. Full suite 8,211 passed, 10 skipped; lint and build clean.

🤖 Generated with Claude Code

https://claude.ai/code/session_01SeWCkETjW35ZbXDRswV1hx

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