class

CRT::Ansi::Viewport

Inherits CRT::Ansi::Canvas < Reference < Object

A virtual buffer larger than the visible area, for scrollable content.

Has the same drawing API as Render (via Canvas): put, write, clear, cell, box, panel. Use blit on the target to copy a visible window from the viewport.

vp = Viewport.new(width: 80, height: 200)
vp.write(0, 150, "way down here", style)
render.blit(vp, x: 5, y: 3, w: 20, h: 10, scroll_y: 140)

Constructors

new(width : Int, height : Int, *, context : Context = CRT::Ansi.context)

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Instance methods

cell(x : Int, y : Int) : Cell

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clear(style : Style = default_style) : Nil

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default_style

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height

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put(x : Int, y : Int, grapheme : String, style : Style = default_style) : Nil

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resize(width : Int, height : Int, *, context : Context = CRT::Ansi.context) : Nil

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width

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write(x : Int, y : Int, text : String, style : Style = default_style) : Int32

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