math - parallel links between nodes -


i've webcola&d3 svg graph nodes , links between them. till today, between nodes links 1 way, if b connected a, 1 way link. enter image description here

today told need support having 2 way links, meaning can send link b , b can send link a.

now i'm stuck math , how accomplish it, used algorithm found draw links till today guess draw links center of node, need show 2 way links in parallel : enter image description here

here algorithm use calculate links position:

let parent = connection.parent;          const sx = parent.source.x;         const sy = parent.source.y;         const tx = parent.target.x;         const ty = parent.target.y;          let angle = math.atan2(ty - sy, tx - sx);         const radiussource = parent.source.radius;         const radiustarget = parent.target.radius;          let x1 = sx + math.cos(angle) * radiussource;         let x2 = tx - math.cos(angle) * radiustarget;         let y1 = sy + math.sin(angle) * radiussource;         let y2 = ty - math.sin(angle) * radiustarget;          angle = angle * 180 / math.pi;         let opposite = math.abs(angle) > 90;          if (opposite)             angle -= 180;          connection.coords = [x1, y1, x2, y2, angle, opposite];         return connection.coords;

this part of function result goes 'd' attr of path this:

.attr('d', `m${x1} ${y1} l ${x2} ${y2}`)

the result of 2 way links right override each other, can me improve algorithm make 2 way links parallel?

update: position of links need calculated new radian considering offset, like:

let parent = connection.parent;  const sx = parent.source.x; const sy = parent.source.y; const tx = parent.target.x; const ty = parent.target.y; const radiussource = parent.source.radius; const radiustarget = parent.target.radius;  let radian = math.atan2(ty - sy, tx - sx); let offset = 0.1 // offset ratio of radian, can adjusted let offsetradian;  let angle = radian * 180 / math.pi; let opposite = math.abs(angle) > 90; if (opposite) {     angle -= 180;     offsetradian = radian * (1 + offset); } else {     offsetradian = radian * (1 - offset); }  let x1 = sx + math.cos(offsetradian) * radiussource; let y1 = sy + math.sin(offsetradian) * radiussource;  let x2 = tx - math.sin(offsetradian) * radiustarget; let y2 = ty - math.cos(offsetradian) * radiustarget;  connection.coords = [x1, y1, x2, y2, angle, opposite]; return connection.coords;

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