Greyscale bars/Display: Difference between revisions
Content deleted Content added
→{{header|Lua}}: added Lua solution |
|||
| Line 1,155: | Line 1,155: | ||
</lang> |
</lang> |
||
Resulting [http://www.diga.me.uk/greyscale.gif GreyScale image] without the outlines. |
Resulting [http://www.diga.me.uk/greyscale.gif GreyScale image] without the outlines. |
||
=={{header|Lua}}== |
|||
{{libheader|nw}} |
|||
{{libheader|cairo}} |
|||
<lang lua>local nw = require("nw") |
|||
local app = nw:app() |
|||
local cw, ch = 320, 240 |
|||
local win = app:window(cw, ch, "Grayscale Bars", false) |
|||
function win:repaint() |
|||
local cr = win:bitmap():cairo() |
|||
local ystride = ch/4 |
|||
for y = 0, 3 do |
|||
local i, n = 1, 2^(y+3) |
|||
local xstride = cw/n |
|||
for x = 0, n-1 do |
|||
cr:rectangle(x*xstride, y*ystride, xstride, ystride) |
|||
local gray = x / (n-1) |
|||
if y%2>0 then gray=1-gray end |
|||
cr:rgb(gray, gray, gray) |
|||
cr:fill() |
|||
end |
|||
end |
|||
end |
|||
win:show() |
|||
app:run()</lang> |
|||
=={{header|Mathematica}} / {{header|Wolfram Language}}== |
=={{header|Mathematica}} / {{header|Wolfram Language}}== |
||