Curved SVG arrow between two objects (rects or circles) https://twitter.com/dan_abramov/status/1362255543721672704
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// from/to: { left, top, width, height, shape: 'circle' | 'rect' } | |
function CurvedArrow({ from, to }) { | |
function curvedHorizontal(x1, y1, x2, y2) { | |
function pos(t) { | |
let mx = x1 + (x2 - x1) / 2; | |
let p1 = {x: x1, y: y1}; | |
let p2 = {x: mx, y: y1}; | |
let p3 = {x: mx, y: y2}; | |
let p4 = {x: x2, y: y2}; | |
return { | |
x: ( | |
((1 - t) ** 3) * p1.x + | |
3 * ((1 - t) ** 2) * t * p2.x + | |
3 * (1 - t) * (t ** 2) * p3.x + | |
(t ** 3) * p4.x | |
), | |
y: ( | |
((1 - t) ** 3) * p1.y + | |
3 * ((1 - t) ** 2) * t * p2.y + | |
3 * (1 - t) * (t ** 2) * p3.y + | |
(t ** 3) * p4.y | |
) | |
}; | |
} | |
function intersects(point, area) { | |
if (area.shape === 'rect') { | |
return ( | |
point.x >= area.left && | |
point.x <= (area.left + area.width) | |
) && ( | |
point.y >= area.top && | |
point.y <= (area.top + area.height) | |
); | |
} else if (area.shape === 'circle') { | |
const center = { | |
x: area.left + (area.width / 2), | |
y: area.top + (area.height / 2) | |
} | |
return Math.sqrt( | |
(center.x - point.x) ** 2 + | |
(center.y - point.y) ** 2 | |
) <= area.width / 2; | |
} | |
} | |
let line = [] | |
for (let t = 0; t < 1; t += 0.001) { | |
let p = pos(t) | |
if (!intersects(p, from) && !intersects(p, to)) { | |
line.push(p.x, p.y); | |
} | |
} | |
return line.length > 0 ? 'M ' + line.join(' ') : ''; | |
} | |
return ( | |
<path d={curvedHorizontal( | |
from.left + from.width / 2, | |
from.top + from.height / 2, | |
to.left + to.width / 2, | |
to.top + to.height / 2, | |
)} | |
stroke="black" | |
strokeWidth={4} | |
fill="none" | |
markerEnd="url(#arrowhead)" | |
/> | |
); | |
} |
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