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Changelog: say what scaleRounding is, in two sentences #1753

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obiot merged 1 commit into from
Oct 18, 2026
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Changelog: say what scaleRounding is, in two sentences #1753

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2 changes: 1 addition & 1 deletion packages/melonjs/CHANGELOG.md
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## [20.9.0] (melonJS 2) - _2026-10-18_

### Added
- **`scaleRounding`**: `"integer"` constrains the automatic scale factor to a whole number of device pixels per source pixel, letterboxing whatever is left over, where the default `"fractional"` fills the container exactly. A 480 wide design in a 1280 wide container is scaled by 2.667, so some source pixels cover three device pixels and some cover two, which pixel art shows as uneven stems and shimmering edges and which browsers resolve differently, so the same scene looks crisp in one and soft in another. The rounding is applied in DEVICE pixels, since `devicePixelRatio` would otherwise put the fraction back. It affects `scaleMethod: "fit"` only, because every other method resizes the renderer to its container and so has no fixed factor to round
- **`scaleRounding` application setting**: optional, and `"fractional"` by default, so nothing existing changes. `"integer"` constrains the automatic scale factor to a whole number of device pixels per source pixel and letterboxes the remainder, which is what stops pixel art showing uneven stems and shimmering edges; it applies to `scaleMethod: "fit"` only
- **Sprite-sheet particles** (`framewidth`, `frameheight`, `frames`, `randomFrame` on `ParticleEmitter`): a particle plays a frame sequence once over its own lifetime, or holds one frame picked at random when it is born. One sheet is one image, so a burst of varied debris still batches into a single draw call ([#1610](https://github.com/melonjs/melonJS/issues/1610), thanks @snowyukitty)
- **`slerp(v, alpha)` on all four vector classes**: interpolate along the ARC between two directions at a constant angular rate, where `lerp` slows at the ends and shortens the vector through the middle. 2D takes the shorter way round, and the same and opposite cases are handled rather than returning `NaN`
- **`Trail3d`**: a fading, tapering ribbon that recedes properly into a 3D scene, for an exhaust streak, a speed trail or a spell arc. It is a `Mesh`, so unlike the 2D `Trail` it narrows along its own length, takes a post effect and a `tint`, and costs one indexed draw call rather than a filled path per segment. It needs a `Camera3d` ([#1621](https://github.com/melonjs/melonJS/issues/1621))
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