fillRectx

fillRectx is a graphical drawing function used in several canvas-style APIs to fill a rectangular area with color on a drawing surface. It is an extended form of the standard fillRect operation, adding features such as rounded corners, per-rectangle opacity, and more flexible handling of transforms.

Typical usage involves specifying the top-left coordinates (x, y), the rectangle's width and height, and a color. An optional options object can supply opacity (0 to 1), cornerRadius for rounded corners, and a blendMode to control how the fill composites with existing pixels. Some implementations also allow passing a pattern or gradient instead of a solid color.

When invoked, fillRectx fills the area within the current clipping region, applying the current transformation matrix. If cornerRadius is nonzero, a rounded rectangle is drawn. If an alpha value is provided, the fill is blended accordingly. If a stroke option is supplied, an outline may be drawn after the fill. The operation respects antialiasing settings and the surface’s compositing rules.

Variants and compatibility: fillRectx is not part of a universal standard; some libraries provide similar features under names like fillRect or roundedFillRect. Implementations may differ in coordinate precision, performance, and how they interact with other drawing commands or layers.

History and usage notes: The term fillRectx appears in tutorials and API design discussions as an example of extending basic drawing primitives with additional styling while preserving a simple interface. See also fillRect, fillRoundRect, and canvas drawing primitives.