Particle fountain: Difference between revisions
Added Wren
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(Added Wren) |
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[https://github.com/thundergnat/rc/blob/master/img/fountain-raku.mp4?raw=true Link to off-site .mp4 video]
=={{header|Wren}}==
{{trans|Julia}}
{{libheader|DOME}}
{{libheader|Wren-dynamic}}
<lang ecmascript>import "dome" for Window, Platform, Process
import "graphics" for Canvas, Color
import "math" for Math, Point
import "random" for Random
import "input" for Keyboard
import "./dynamic" for Struct
var Start = Platform.time
var Rand = Random.new()
var fields = [
"particleNum",
"positions",
"velocities",
"lifetimes",
"points",
"numPoints",
"saturation",
"spread",
"range",
"reciprocate"
]
var ParticleFountain = Struct.create("ParticleFountain", fields)
class ParticleDisplay {
construct new(particleNum, width, height) {
Window.resize(width, height)
Canvas.resize(width, height)
Window.title = "Wren Particle System!"
_pn = particleNum
_w = width
_h = height
_df = 1 / 200 // say
_pf = ParticleFountain.new(
_pn, // particleNum
List.filled(_pn * 2, 0), // positions
List.filled(_pn * 2, 0), // velocities
List.filled(_pn, 0), // lifetimes
List.filled(_pn, null), // points
0, // numPoints
0.4, // saturation
1.5, // spread
1.5, // range
false // reciprocate
)
for (i in 0..._pn) _pf.points[i] = Point.new(0, 0)
}
init() {
Canvas.cls()
_frames = 0
}
updatePF() {
var xidx = 0
var yidx = 1
var pointIdx = 0
var recip = Fn.new { _pf.reciprocate ? _pf.range * Math.sin(Platform.time/1000) : 0 }
for (idx in 0..._pf.particleNum) {
var willDraw = false
if (_pf.lifetimes[idx] <= 0) {
if (Rand.float() < _df) {
_pf.lifetimes[idx] = 2.5 // time to live
_pf.positions[xidx] = _w / 20 // starting position x
_pf.positions[yidx] = _h / 10 // and y
// starting velocities x and y
// randomized slightly so points reach different heights
_pf.velocities[xidx] = 10 * (_pf.spread * Rand.float() - _pf.spread / 2 + recip.call())
_pf.velocities[yidx] = (Rand.float() - 2.9) * _h / 20.5
_willDraw = true
}
} else {
if (_pf.positions[yidx] > _h/10 && _pf.velocities[yidx] > 0) {
_pf.velocities[yidx] = _pf.velocities[yidx] * (-0.3) // bounce
}
_pf.velocities[yidx] = _pf.velocities[yidx] + _df * _h / 10 // adjust velocity
_pf.positions[xidx] = _pf.positions[xidx] + _pf.velocities[xidx] * _df // adjust position x
_pf.positions[yidx] = _pf.positions[yidx] + _pf.velocities[yidx] * _df // and y
_pf.lifetimes[idx] = _pf.lifetimes[idx] - _df
willDraw = true
}
if (willDraw) { // gather all the points that are going to be rendered
_pf.points[pointIdx] = Point.new((_pf.positions[xidx] * 10).floor,
(_pf.positions[yidx] * 10).floor)
pointIdx = pointIdx + 1
}
xidx = xidx + 2
yidx = xidx + 1
_pf.numPoints = pointIdx
}
}
update() {
if (Keyboard["Up"].justPressed) {
_pf.saturation = Math.min(_pf.saturation + 0.1, 1)
} else if (Keyboard["Down"].justPressed) {
_pf.saturation = Math.max(_pf.saturation - 0.1, 0)
} else if (Keyboard["PageUp"].justPressed) {
_pf.spread = Math.min(_pf.spread + 1, 50)
} else if (Keyboard["PageDown"].justPressed) {
_pf.spread = Math.max(_pf.spread - 0.1, 0.2)
} else if (Keyboard["Left"].justPressed) {
_pf.range = Math.min(_pf.range + 0.1, 12)
} else if (Keyboard["Right"].justPressed) {
_pf.range = Math.max(_pf.range - 0.1, 0.1)
} else if (Keyboard["Space"].justPressed) {
_pf.reciprocate = !_pf.reciprocate
} else if (Keyboard["Q"].justPressed) {
Process.exit()
}
updatePF()
}
draw(alpha) {
var c = Color.hsv((Platform.time % 5) * 72, _pf.saturation, 0.5, 0x7f)
for (i in 0..._pf.numPoints) {
Canvas.pset(_pf.points[i].x, _pf.points[i].y, c)
}
_frames = _frames + 1
var now = Platform.time
if (now - Start >= 1) {
Start = now
Window.title = "Wren Particle System! (FPS = %(_frames))"
_frames = 0
}
}
}
System.print("""
Use UP and DOWN arrow keys to modify the saturation of the particle colors.
Use PAGE UP and PAGE DOWN keys to modify the "spread" of the particles.
Toggle reciprocation off / on with the SPACE bar.
Use LEFT and RIGHT arrow keys to modify angle range for reciprocation.
Press the "q" key to quit.
""")
var Game = ParticleDisplay.new(3000, 800, 800)</lang>
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