Mojo struct 🡭

PatternSource

@memory_only
struct PatternSource

A ColorSource that samples a raster tile – the fill source a pattern/image fill queries per pixel, mirroring how LinearGradient/RadialGradient/ConicGradient project a point onto a gradient axis instead.

Holds its own copy of tile, so drawing into the caller’s canvas afterward has no effect on a pattern already built from it.

Fields

• tile (Canvas)
• extend (Extend)
• ox (Float64)
• oy (Float64)

Implemented traits

AnyType, ColorSource, Deinitable, Movable

Methods

__init__

fn def __init__(out self, tile: Canvas, extend: Extend = Extend.REPEAT, ox: Float64 = 0, oy: Float64 = 0)

Args: tile: The pattern’s raster tile. Copied into the source, so the caller’s canvas remains independent afterward. extend: How to sample outside the tile’s bounds – see Extend. ox: Device-space x where the tile’s own (0, 0) pixel sits. oy: Device-space y where the tile’s own (0, 0) pixel sits.

Args:

• tile (Canvas)
• extend (Extend)
• ox (Float64)
• oy (Float64)
• self (Self)

Returns:

Self

color_at

fn def color_at(self, x: Float64, y: Float64) -> Color

The tile’s color at (x, y): shift by the offset, round to the nearest tile pixel, then wrap/clamp/reject that coordinate per extend.

Args:

• self (Self)
• x (Float64): Point x.
• y (Float64): Point y.

Returns:

Color: The sampled tile pixel, or transparent black under Extend.NONE outside the tile, or if the tile is empty.