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Created
February 8, 2018 09:53
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Svelte component
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<svg viewBox="0 0 100 130"> | |
<defs> | |
<pattern id="pattern" width="{{patternWidth}}" height="{{patternHeight}}" patternUnits="userSpaceOnUse"> | |
<path fill="url(#pattern)" stroke-width=".1" d="M0 {{gridHeight}}0h{{patternWidth}}"/> | |
<path fill="url(#pattern)" stroke-width=".1" d="M0 {{patternHeight}}h{{patternWidth}}"/> | |
<path fill="url(#pattern)" stroke-width=".1" d="M0 0h{{patternWidth}}"/> | |
<path fill="url(#pattern)" stroke-width=".1" d="M0 {{patternHeight}}L{{patternWidth}} 0"/> | |
<path fill="url(#pattern)" stroke-width=".1" d="M0 0L{{patternWidth}} {{patternHeight}}"/> | |
</pattern> | |
</defs> | |
<path fill="url(#pattern)" d="M0 0h100v100H0z"/> | |
<g ref:pointSet> | |
{{#each gridPoints as point}} | |
<circle class="point" r=".3em" index={{JSON.stringify(point.index)}} cx={{point.x}} cy={{point.y}}/> | |
<!--<text x={{point.x-0.7}} y={{point.y+0.3}}>{{point.index}}</text>--> | |
{{/each}} | |
</g> | |
<g class='button' on:click="set({state: state === 'running' ? 'paused' : 'running'})"> | |
<rect width=3em height=1.5em/> | |
<text x=.1em y=1em>{{(state == 'running') ? 'Pauze' : 'Start'}}</text> | |
</g> | |
<g class='button' on:click="set({active: null})" transform="translate(14 0)"> | |
<rect width=3em height=1.5em/> | |
<text x=.1em y=1em>Reset</text> | |
</g> | |
</svg> | |
<style> | |
svg { | |
font-size: 4px; | |
} | |
pattern path { | |
stroke: black; | |
} | |
.button rect { | |
fill: rgba(12, 23, 140, 0.3); | |
cursor: pointer; | |
} | |
.button text { | |
font-size: 1em; | |
} | |
text { | |
font-size: .4em; | |
text-align: middle; | |
} | |
.point { | |
fill: #DDD; | |
transition: fill ease-in-out 0.1s; | |
} | |
:global(.active).point { | |
fill: #F00; | |
} | |
</style> | |
<script> | |
const sqrt3d4 = Math.sqrt(3/4.0) | |
export default { | |
data () { | |
return { | |
state: 'stopped' | |
} | |
}, | |
computed: { | |
patternWidth: (gridWidth) => gridWidth, | |
patternHeight: (gridHeight) => gridHeight * 2, | |
gridWidth: (repeat, viewBox) => viewBox[0] / repeat, | |
gridHeight: (gridWidth) => gridWidth * sqrt3d4, | |
gridPoints: (viewBox, gridWidth, gridHeight) => { | |
const p = [] | |
const [width, height] = [ | |
Math.floor(viewBox[0] / gridWidth), | |
Math.floor(viewBox[1] / gridHeight) | |
] | |
let x = 0, y = 0 | |
let even = true | |
let xStart = 0 | |
while (y <= height) { | |
while (x <= width) { | |
p.push({ | |
x: (x - xStart + (y%2 ? 0.5 : 0)) * gridWidth, | |
y: y * gridHeight, | |
index: [x, y] | |
}) | |
x ++ | |
} | |
y ++ | |
xStart = - Math.floor(y/2) | |
x = xStart | |
} | |
return p | |
} | |
}, | |
methods: { | |
random () { | |
const viewBox = this.get('viewBox') | |
const width = viewBox[0] / this.get('gridWidth') | |
const height = viewBox[1] / this.get('gridHeight') | |
const active = [] | |
for (let i=0; i<300; i++) { | |
const y = Math.round(Math.random() * height) | |
const x = Math.round(Math.random() * height) - Math.floor(y/2) | |
active.push([x, y]) | |
} | |
return new Map(active.map(p => [`${p}`, p])) | |
}, | |
tick () { | |
const nextActive = new Map() | |
const active = this.get('active') | |
const viewBox = this.get('viewBox') | |
const gridWidth = this.get('gridWidth') | |
const gridHeight = this.get('gridHeight') | |
const [width, height] = [ | |
Math.floor(viewBox[0] / gridWidth), | |
Math.floor(viewBox[1] / gridHeight) | |
] | |
for (let y = 0; y<height; y++) { | |
let xStart = - Math.floor(y/2) | |
for (let x = xStart; x<width+xStart; x++) { | |
// Ceck whether its in the set | |
let location = [x, y] | |
const neighbours = [[x,y-1],[x+1,y-1],[x+1,y],[x,y+1],[x-1,y+1],[x-1,y]] | |
const isActive = active.has(location.toString()) | |
const activeNeighbours = neighbours.filter(p => | |
active.has(p.toString())).length | |
/* | |
Any live cell with fewer than two live neighbours dies, as if caused by underpopulation. | |
Any live cell with two or three live neighbours lives on to the next generation. | |
Any live cell with more than three live neighbours dies, as if by overpopulation. | |
Any dead cell with exactly three live neighbours becomes a live cell, as if by reproduction. | |
*/ | |
if (isActive) { | |
if (activeNeighbours < 2) { | |
continue // dies | |
} else if (activeNeighbours > 3) { | |
continue // dies | |
} else { | |
// lives | |
nextActive.set(location.toString(), location) | |
} | |
} else { | |
if (activeNeighbours === 3) { | |
// alive | |
nextActive.set(location.toString(), location) | |
} | |
} | |
} | |
} | |
this.set({ | |
active: nextActive | |
}) | |
} | |
}, | |
oncreate() { | |
this.set({ | |
active: this.random() | |
}) | |
this.set({ | |
isActive: ({index: [x, y]}) => this.get('active').find(([px, py]) => (x===px && y===py)) | |
}) | |
this.observe('state', state => { | |
if (state === 'running') { | |
if (this.interval) clearInterval(this.interval); | |
this.interval = setInterval(() => { | |
this.tick() | |
}, this.get('speed')); | |
} else { | |
clearInterval(this.interval); | |
} | |
}) | |
this.observe('active', active => { | |
if (!active) { | |
active = this.random() | |
this.set({active}) | |
} | |
this.refs.pointSet.querySelectorAll('.point.active') | |
.forEach(p => p.classList.remove('active')) | |
active.forEach(point => { | |
let el = this.refs.pointSet | |
.querySelector(`.point[index="[${point}]"]`) | |
if (el) { | |
el.classList.add('active') | |
} | |
}) | |
}) | |
}, | |
ondestroy() { | |
clearInterval(this.interval); | |
} | |
}; | |
</script> |
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{ | |
"viewBox": [100, 100], | |
"repeat": 20, | |
"speed": 300 | |
} |
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