Image:drawrect(x, y, width, height, [opacity], [interpolation] ) 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
[interpolation]
An optional string used to specify the quality of image scaling :
"nearest": Use the exact color of the nearest bitmap pixel to the current rendering pixel (the default)."linear": Uses a four point sample and linear interpolation, using more processing time, but outputs a higher quality image.
Return value
This function returns no value.Example
local ui = require "ui"
require "canvas"
-- create a simple Window
local win = ui.Window("Image:drawrect 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("LuaRT.png")
function canvas:onPaint()
self:begin()
img:drawrect(math.random(w), math.random(h), math.random(500), math.random(400), math.random(), math.random())
self:flip()
end
ui.run(win):wait()