ludic/docs/language/screen/screen-fill_rectangle.md

id	name	category	kind	tokens	sig	tip	order	ns	member
screen-fill_rectangle	Screen.fill_rectangle	screen	namespace-method	Screen.fill_rectangle	Screen.fill_rectangle(x, y, width, height, color)	Draw a solid, filled rectangle at a pixel position.	1	Screen	fill_rectangle

Draws a solid block of color from the top-left corner (x, y) spanning width by height pixels. This is the workhorse for drawing tiles, sprites-from-primitives, health bars, and background panels, since a Ludic game paints every pixel itself rather than loading image assets. Coordinates are in pixels measured from the top-left of the screen, so multiply a grid column/row by your tile size to place things on a board. Parts of the rectangle that fall outside the framebuffer are simply clipped.

Parameters:

• x — the left edge, in pixels from the left of the screen
• y — the top edge, in pixels from the top of the screen
• width — the rectangle width in pixels
• height — the rectangle height in pixels
• color — the fill color, e.g. a Color.* name or a 0xRRGGBB literal

program FilledTiles {
  property Position { column: int = 0, row: int = 0 }
  model Player { Position }

  const TILE_SIZE: int = 16

  handler SpawnPlayer phase Start {
    spawn Player { Position { column: 4, row: 3 } }
  }

  handler DrawWorld phase Render {
    Screen.clear(Color.MidnightBlue)
    for (Position) in query [Position, {Player}] {
      Screen.fill_rectangle(
        x: Position.column * TILE_SIZE,
        y: Position.row * TILE_SIZE,
        width: TILE_SIZE,
        height: TILE_SIZE,
        color: Color.LimeGreen)
    }
    Screen.show()
  }
}