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import { guid } from "../../clientUtils/Util"
import * as React from "react"
import { computed } from "mobx"
import { observer } from "mobx-react"
import { DualAxis } from "../axis/Axis"
import { generateComparisonLinePoints } from "./ComparisonLineGenerator"
import { Bounds } from "../../clientUtils/Bounds"
import { PointVector } from "../../clientUtils/PointVector"
import { getElementWithHalo } from "./Halos"
export interface ComparisonLineConfig {
label?: string
yEquals?: string
}
@observer
export class ComparisonLine extends React.Component<{
dualAxis: DualAxis
comparisonLine: ComparisonLineConfig
}> {
private renderUid = guid()
@computed private get controlData(): [number, number][] {
const { comparisonLine, dualAxis } = this.props
const { horizontalAxis, verticalAxis } = dualAxis
return generateComparisonLinePoints(
comparisonLine.yEquals,
horizontalAxis.domain,
verticalAxis.domain,
horizontalAxis.scaleType,
verticalAxis.scaleType
)
}
@computed private get linePath(): string | null {
const { controlData } = this
const { horizontalAxis, verticalAxis } = this.props.dualAxis
const line = d3_line()
.curve(curveLinear)
.x((d) => horizontalAxis.place(d[0]))
.y((d) => verticalAxis.place(d[1]))
return line(controlData)
}
@computed private get placedLabel():
| { x: number; y: number; bounds: Bounds; angle: number; text: string }
| undefined {
const { label } = this.props.comparisonLine
if (!label) return
const { controlData } = this
const { horizontalAxis, verticalAxis, innerBounds } =
this.props.dualAxis
// Find the points of the line that are actually placeable on the chart
const linePoints = controlData
.map(
(d) =>
new PointVector(
horizontalAxis.place(d[0]),
verticalAxis.place(d[1])
)
)
.filter((p) => innerBounds.contains(p))
if (!linePoints.length) return
const midPoint = linePoints[Math.floor(linePoints.length / 2)]
const p1 = linePoints[0]
const p2 = linePoints[linePoints.length - 1]
const angle = (Math.atan2(p2.y - p1.y, p2.x - p1.x) * 180) / Math.PI
const bounds = Bounds.forText(label)
return {
x: midPoint.x,
y: midPoint.y,
bounds: bounds,
angle: angle,
text: label,
}
}
render(): JSX.Element {
const { innerBounds } = this.props.dualAxis
const { linePath, renderUid, placedLabel } = this
return (
<g className="comparisonLine">
<defs>
<clipPath id={`axisBounds-${renderUid}`}>
<rect
x={innerBounds.x}
y={innerBounds.y}
width={innerBounds.width}
height={innerBounds.height}
/>
</clipPath>
</defs>
<path
style={{
opacity: 0.9,
fill: "none",
stroke: "#ccc",
strokeDasharray: "2 2",
}}
id={`path-${renderUid}`}
d={linePath || undefined}
clipPath={`url(#axisBounds-${renderUid})`}
/>
{placedLabel && (
<text
style={{
fontSize: "80%",
opacity: 0.9,
textAnchor: "end",
fill: "#999",
}}
clipPath={`url(#axisBounds-${renderUid})`}
>
{getElementWithHalo(
`path-${renderUid}`,
<textPath
baselineShift="-0.2rem"
href={`#path-${renderUid}`}
startOffset="90%"
>
{placedLabel.text}
</textPath>
)}
</text>
)}
</g>
)
}
}
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