LinearGradient.opacity | LuaRT free and open source Windows programming framework for Lua

LinearGradient.opacity read/write property

Get or set the degree of opacity of the linear gradient, a number starting from 0.0(full transparency) to 1.0(full opacity)

Example


local ui = require "ui"
require "canvas"

-- create a simple Window
local win = ui.Window("LinearGradient.opacity sample", "fixed", 500, 400)

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

local gradient = canvas:LinearGradient { [0] = 0xE30940FF, [0.33] = 0xE7D702FF, [0.66] = 0x0FA895FF, [1] = 0x1373E8FF }
gradient.start = { 0, 0 }
gradient.stop = { canvas.width, 0 }
gradient.opacity = 0.5

function canvas:onPaint()
  self.begin()
  self:clear()
  self:fillrect(0, 0, canvas.width, canvas.height, gradient)
  self:flip()
end

ui.run(win):wait()