hudregion

hudregion is a term used in user interface design and computer graphics to describe a defined subarea of a heads-up display (HUD) or other overlay surface where certain elements are rendered. It typically refers to a rectangular, though sometimes polygonal, portion of the screen that is designated for displaying instruments, indicators, or controls while preserving the rest of the display for other content. hudregion can be defined in terms of coordinates or as normalized fractions of the display size.

In practice, a hudregion serves to constrain rendering and layout. By confining overlay elements to a specific region, designers can improve readability, reduce occlusion of important scene content, and achieve consistent layouts across different screen sizes and aspect ratios. This is common in simulations, aviation and automotive HUDs, video games, and augmented reality interfaces, where multiple overlays must coexist without interfering with core visuals.

Common properties of a hudregion include x and y coordinates, width and height, and an anchor or alignment specification that determines how the region behaves when the display size changes. Values may be expressed in screen-space units or as normalized coordinates (for example, 0 to 1, relative to width and height). Some implementations support margins, padding, clipping, and optional transformations such as scaling.

Related concepts include viewports, panels, and overlays. The hudregion concept emphasizes a defined, bounded area for HUD content rather than a global screen layout.