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index.js
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index.js
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(() => {
let rows = 12
const hive = (() => {
const grid = []
while (rows--) {
const row = []
let cols = 36
while (cols--) {
row.push(
Math.random() > 0.2
)
}
grid.push(row)
}
return grid
})()
const drawHive = (hive) => {
// This will mirror the hive.
const elements = []
const getIntAttr = (element, attr) => {
return parseInt(element.getAttribute(attr))
}
const getCoordsFromElement = (element) => {
const columnIndex = getIntAttr(element, 'data-columnIndex')
const rowIndex = getIntAttr(element, 'data-rowIndex')
return {
x: columnIndex,
y: rowIndex,
}
}
const getElementFromCoords = (coords) => {
const row = elements[coords.y]
if (row) {
const element = row[coords.x]
return element
}
}
const getAdjacentCells = (coords) => {
const x = coords.x
const y = coords.y
const n = y - 1
const s = y + 1
const wx = x - 1
const ex = x + 1
const ny = x % 2 === 1 ? y : n
const sy = x % 2 === 1 ? s : y
return [
// N
getElementFromCoords({ x: x, y: n }),
// S
getElementFromCoords({ x: x, y: s }),
// NW
getElementFromCoords({ x: wx, y: ny }),
// NE
getElementFromCoords({ x: ex, y: ny }),
// SW
getElementFromCoords({ x: wx, y: sy }),
// SE
getElementFromCoords({ x: ex, y: sy }),
]
.filter(x => !!x)
}
const addClass = (element, className) => {
if (element.className.indexOf(className) === -1) {
element.className += (' ' + className)
}
}
const handleCellMouseOver = (event) => {
const target = event.target
const coords = getCoordsFromElement(target)
addClass(target, 'hover')
const adjacentCells = getAdjacentCells(coords)
adjacentCells.forEach(cell => {
addClass(cell, 'adjacent')
})
}
const removeClass = (element, className) => {
element.className = element.className.split(' ').filter(x => x !== className).join(' ')
}
const handleCellMouseOut = (event) => {
const target = event.target
const coords = getCoordsFromElement(target)
removeClass(target, 'hover')
const adjacentCells = getAdjacentCells(coords)
adjacentCells.forEach(cell => {
removeClass(cell, 'adjacent')
})
}
const cellFactory = (filled, columnIndex, rowIndex) => {
const div = document.createElement('div')
const className = 'cell' + (filled
? ' filled'
: ''
)
div.className = className
if (filled) {
div.addEventListener('mouseover', handleCellMouseOver)
div.addEventListener('mouseout', handleCellMouseOut)
}
div.setAttribute('data-columnIndex', columnIndex)
div.setAttribute('data-rowIndex', rowIndex)
return div
}
const root = document.querySelector('#hive')
const size = 50
const padding = 2
hive.forEach((row, rowIndex) => {
const elementRow = []
row.forEach((value, columnIndex) => {
const cell = cellFactory(!!value, columnIndex, rowIndex)
const x = (columnIndex * 3 / 4 * size) + padding * columnIndex
const y = (rowIndex * size + (columnIndex % 2 === 1 ? (1 / 2 * size) : 0))
+ padding * rowIndex
cell.style.left = x + 'px'
cell.style.top = y + 'px'
elementRow.push(cell)
root.append(cell)
})
elements.push(elementRow)
})
}
drawHive(hive)
})()