Image:drawrect(x, y, width, height, [ opacity ] ) method
Draws the Image on its Canvas, using the specified position, width, height and opacity.
Parameters
x
A number representing the horizontal position (zero means the left side of the Canvas)
y
A number representing the vertical position (zero means the top side of the Canvas)
width
A number that represent the Image width
height
A number that represent the Image height
[ opacity ]
An optional number representing the degree of opacity, defaulting to 1 (full opacity). A value of 0.5 means middle transparency
Return value
This function returns no value.Example
local ui = require "ui"
require "canvas"
-- create a simple Window
local win = ui.Window("Canvas.rect() sample", "fixed", 500, 400)
-- create a Canvas
local canvas = ui.Canvas(win)
canvas.align = "all"
canvas.bgcolor = 0x000000FF
local w = canvas.width
local h = canvas.height
local img = canvas:Image("examples/canvas/LuaRT.png")
function canvas:onPaint()
img:drawrect(math.random(w), math.random(h), math.random(500), math.random(400), math.random(), math.random())
end
win:show()
-- update user interface
repeat
ui.update()
until not win.visible