Canvas:capture()

Canvas:capture(file)method

Captures the current canvas content and saves it as a file on the disk.

Parameters

file

A File or a filename as a string.
The image format is determined by the file extension, which may be one of the following values : .bmp, .png, .jpg|.jpeg, .bmp, .tiff|.tif and .gif.

Return value

This function returns no value.

Example


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

local win = ui.Window("Capture demo", 320, 130)
local c = ui.Canvas(win)
c.align = "all"

function c:onPaint()
    self:begin()
    self:clear(0xFFFFFFFF)                      
    self:fillrect(10, 10, 310, 120, 0xFF0078D7)
    self:print("Hello LuaRT", 130, 60, 0xFFFFFFFF)
    self:flip()
end

win:show()

-- wait 1s...
sleep(1000)

--.. then capture the canvas content
c:capture("capture.png")

-- keep window visible briefly then exit
sleep(800)