RenderRectangle

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video.renderRectangle(x, y, width, height, a, r, g, b)
This method renders a rectangle on the screen with corners at (x, y) and (x + width - 1, y + height - 1), using an ARGB color.
Parameter	Expected Type	Description
x	An integer	The left edge of the rectangle, inclusive.
y	An integer	The top edge of the rectangle, inclusive.
width	An integer	The width of the rectangle.
height	An integer	The height of the rectangle.
a	An integer	The alpha component of the color, with 0 as transparent and 255 as opaque.
r	An integer	The red component of the color.
g	An integer	The green component of the color.
b	An integer	The blue component of the color.
Returns
Returns nothing.

Daisymoon Video Lib

   -- fill screen with blue
   local w,h = video.getScreenSize()
   video.renderRectangle(0, 0, w, h, 255, 0, 0, 128)