Canvas:flip()

Canvas:flip()method

Flips the back buffer, displaying it on the Canvas.

Return value

This function returns no value.

Example


--! luart-extensions
import ui
require "canvas"

-- create a simple Window
local win = ui.Window("Canvas.flip() sample", "fixed", 320, 200)

-- create a Canvas
local canvas = ui.Canvas(win)
canvas.align = "all"

local x = 160
local y = 100

function win:onKey(key)
  if key == "VK_UP" then
    y = y - 4
  elseif key == "VK_DOWN" then
    y = y + 4
  elseif key == "VK_LEFT" then
    x = x - 4
  elseif key == "VK_RIGHT" then
    x = x + 4
  end
end

function canvas:onPaint()
  self:begin()
  self:clear()
  self:fillcircle(x, y, 5, 0xA0D0A0)
  self:flip()
end

await win:showasync()