Canvas.flip() | LuaRT free and open source Windows programming framework for Lua

Canvas:flip() method

Flips the back buffer, displaying it on the Canvas.

The backbuffer is where all drawing operations take place. The following method should be called once your drawing on the Canvas has been completed, so that your drawing can be displayed.

Return value

This function returns no value.

Example


local ui = require "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)
  print("coucou")
  if key == "VK_UP" then
    y = y - 2
  elseif key == "VK_DOWN" then
    y = y + 2
  elseif key == "VK_LEFT" then
    x = x - 2
  elseif key == "VK_RIGHT" then
    x = x + 2
  end
end

function canvas:onPaint()
  self:clear()
  self:fillcircle(x, y, 10, 0xA0D0A0)
  self:flip()
end

win:show()

-- update user interface
repeat
  ui.update()
until not win.visible