Bitmap/Flood fill: Difference between revisions
Added Wren
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[[Image:Tcl_flood_fill.png]]
=={{header|Wren}}==
{{libheader|DOME}}
This script uses the same 'flood fill' routine as the Go entry.
It draws 3 concentric squares on the canvas colored yellow, red and white.
When the up arrow is pressed, the red square changes to blue and when the down arrow is pressed the blue square turns back to red.
<lang ecmascript>import "graphics" for Canvas, ImageData, Color
import "dome" for Window
import "input" for Keyboard
class Bitmap {
construct new(name, size) {
Window.title = name
Window.resize(size, size)
Canvas.resize(size, size)
size = size / 2
_bmp = ImageData.create(name, size, size)
_size = size
_flooded = false
}
init() {
var s = _size
var hs = s / 2
var qs = s / 4
fill(0, 0, s, s, Color.yellow)
fill(qs, qs, 3 * qs, 3 * qs, Color.red)
fill(qs * 1.5, qs * 1.5, qs * 2.5, qs * 2.5, Color.white)
_bmp.draw(hs, hs)
}
fill(s, t, w, h, col) {
for (x in s...w) {
for (y in t...h) _bmp.pset(x, y, col)
}
}
flood(x, y, repl) {
var target = pget(x, y)
var ff // recursive closure
ff = Fn.new { |x, y|
if (x >= 0 && x < _bmp.width && y >= 0 && y < _bmp.height) {
var p = pget(x, y)
if (p.r == target.r && p.g == target.g && p.b == target.b) {
pset(x, y, repl)
ff.call(x-1, y)
ff.call(x+1, y)
ff.call(x, y-1)
ff.call(x, y+1)
}
}
}
ff.call(x, y)
}
pset(x, y, col) { _bmp.pset(x, y, col) }
pget(x, y) { _bmp.pget(x, y) }
update() {
var hs = _size / 2
var qs = _size / 4
if (!_flooded && Keyboard.isKeyDown("up")) {
flood(qs, qs, Color.blue)
_bmp.draw(hs, hs)
_flooded = true
} else if (_flooded && Keyboard.isKeyDown("down")) {
flood(qs, qs, Color.red)
_bmp.draw(hs, hs)
_flooded = false
}
}
draw(alpha) {}
}
var Game = Bitmap.new("Bitmap - flood fill", 600)</lang>
=={{header|XPL0}}==
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