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demo13-polar-coordinate-system.html
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demo13-polar-coordinate-system.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<style>
body {
display: flex;
width: 100vw;
height: 100vh;
}
svg#chart {
margin: auto;
}
</style>
</head>
<body>
<script src="https://d3js.org/d3-shape.v1.min.js"></script>
<script src="https://d3js.org/d3.v5.min.js"></script>
<script src="./mock/demo13.js"></script>
<script>
// https://echarts.baidu.com/examples/editor.html?c=line-polar
const width = 960
const height = 500
const svg = d3.select('body')
.append('svg')
.attr('id', 'chart')
.attr('width', width)
.attr('height', height)
.append('g')
.attr('transform', 'translate(' + width / 2 + ',' + height / 2 + ')')
let radius = Math.min(width, height) / 2 - 2
let moveGridLine
drawPolarCsys({
center: [width / 2, height / 2],
r: radius
})
drawLine(
mockData(radius)
)
drawLine2(
mockData(radius)
)
drawLine3(
mockData2()
)
function drawLine(data) {
const line = d3.lineRadial()
.angle(d => d.angle)
.radius(d => d.radius - radius / 2)
svg.append('g')
.append('path')
.attr('class', 'line')
.datum(data)
.attr('fill', 'none')
.attr('stroke', '#e91b1b')
.attr('stroke-width', 1.5)
.attr('stroke-linejoin', 'round')
.attr('stroke-linecap', 'round')
.attr('d', line)
}
function drawLine2(data) {
const line = d3.line()
.x(d => Math.sin(d.angle) * d.radius)
.y(d => Math.cos(d.angle) * d.radius)
svg.append('g')
.append('path')
.attr('class', 'line')
.datum(data)
.attr('fill', 'none')
.attr('stroke', 'steelblue')
.attr('stroke-width', 1.5)
.attr('stroke-linejoin', 'round')
.attr('stroke-linecap', 'round')
.attr('d', line)
}
function drawLine3(data) {
const xScale = d3.scaleLinear()
.range([0, 2 * Math.PI])
.domain([0, d3.max(data, d => d.x)])
const yScale = d3.scaleLinear()
.range([0, radius / 4 * 3])
.domain([0, d3.max(data, d => d.y)])
const line = d3.line()
.x(d => Math.sin(xScale(d.x)) * yScale(d.y))
.y(d => Math.cos(xScale(d.x)) * yScale(d.y))
svg.append('g')
.append('path')
.attr('class', 'line')
.datum(data)
.attr('fill', 'none')
.attr('stroke', '#0ece8a')
.attr('stroke-width', 1.5)
.attr('stroke-linejoin', 'round')
.attr('stroke-linecap', 'round')
.attr('d', line)
}
function drawPolarCsys({
center,
r
}) {
setRadius(r)
drawGridCircle()
drawGridLine()
}
function drawGridLine() {
const gridLines = svg.append('g')
.attr('class', 'grid-lines')
for (let i = 1; i < 13; i++) {
const [x, y] = calcPos(radius, Math.PI / 6 * i)
gridLines.append('line')
.attr('x1', 2)
.attr('y1', 2)
.attr('x2', x)
.attr('y2', y)
.attr('stroke-width', 1)
.attr('stroke', '#dadada')
}
}
function drawGridCircle() {
const grid = svg.append('g')
.attr('class', 'grid-circles')
for (let i = 1; i < 6; i++) {
grid.append('circle')
.attr('cx', 0)
.attr('cy', 0)
.attr('r', radius / 5 * i)
.attr('stroke-width', '1')
.attr('stroke', () => {
console.log(i)
if (i < 5) {
return '#dadada'
} else {
return '#464646'
}
})
.attr('fill', 'transparent')
}
// svg.on('mousemove', e => {
// const {
// x,
// y
// } = d3.event
// const xBorder = Math.abs(x - width / 2)
// const yBorder = Math.abs(y - height / 2)
// const r = Math.sqrt(xBorder * xBorder + yBorder * yBorder)
// if (moveGridLine) {
// moveGridLine.attr('r', radius)
// moveGridLine.attr('stroke', () => {
// if (r > radius) {
// return 'transparent'
// }
// return '#464646'
// })
// } else {
// moveGridLine = grid
// .append('circle')
// .attr('cx', 0)
// .attr('cy', 0)
// .attr('r', r)
// .attr('stroke-width', 1)
// .attr('stroke-dasharray', '5,5')
// .attr('stroke', () => {
// if (r > radius) {
// return 'transparent'
// }
// return '#464646'
// })
// .attr('fill', 'transparent')
// }
// })
}
function calcPos(radius, angle) {
return [
Math.sin(angle) * radius,
Math.cos(angle) * radius
]
}
function setRadius(r) {
const percentReg = /^(100|[1-9]?\d(\.\d*)?)%$/
if (typeof r === 'number' &&
r > 0) {
radius = r
} else if (percentReg.test(radius)) {
radius = Number(percentReg.exec(r)[1]) * r / 100
}
}
</script>
</body>
</html>