Plot a 16-panel test pattern for evaluating graphics devices.

Renders a 4x4 grid of panels, each isolating a specific drawing primitive or device feature. Covers all 8 DrawCall types (Rect, Circle, Line, Polygon, Polyline, Path, Text, Raster) plus clipping, alpha blending, line styles, text metrics, anti-aliasing hints, and point characters.

Usage

ugd_test_pattern()

Value

Invisible NULL; called for the side effect of drawing.

Examples

if (FALSE) { # \dontrun{

ugd_test_pattern()
} # }