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Colour bars/Display: Difference between revisions
→{{header|Mathematica}} / {{header|Wolfram Language}}
Line 1,210:
[[File:ColourBarsMathematica.png]]
=={{header|Nim}}==
{{libheader|gintro}}
<lang Nim>import gintro/[glib, gobject, gtk, gio, cairo]
const
Width = 400
Height = 300
#---------------------------------------------------------------------------------------------------
proc draw(area: DrawingArea; context: Context) =
## Draw the color bars.
const Colors = [[0.0, 0.0, 0.0], [255.0, 0.0, 0.0],
[0.0, 255.0, 0.0], [0.0, 0.0, 255.0],
[255.0, 0.0, 255.0], [0.0, 255.0, 255.0],
[255.0, 255.0, 0.0], [255.0, 255.0, 255.0]]
const
RectWidth = float(Width div Colors.len)
RectHeight = float(Height)
var x = 0.0
for color in Colors:
context.rectangle(x, 0, RectWidth, RectHeight)
context.setSource(color[0], color[1], color[2])
context.fill()
x += RectWidth
#---------------------------------------------------------------------------------------------------
proc onDraw(area: DrawingArea; context: Context; data: pointer): bool =
## Callback to draw/redraw the drawing area contents.
area.draw(context)
result = true
#---------------------------------------------------------------------------------------------------
proc activate(app: Application) =
## Activate the application.
let window = app.newApplicationWindow()
window.setSizeRequest(Width, Height)
window.setTitle("Color bars")
# Create the drawing area.
let area = newDrawingArea()
window.add(area)
# Connect the "draw" event to the callback to draw the spiral.
discard area.connect("draw", ondraw, pointer(nil))
window.showAll()
#———————————————————————————————————————————————————————————————————————————————————————————————————
let app = newApplication(Application, "Rosetta.ColorBars")
discard app.connect("activate", activate)
discard app.run()</lang>
=={{header|OCaml}}==
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