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chore: Add comments in edge handling

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This commit is contained in:
Sidharth Vinod
2023-08-29 23:49:00 +05:30
parent f30a23f41e
commit cca9662365
1 changed files with 7 additions and 0 deletions
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7
packages/mermaid/src/dagre-wrapper/edges.js
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@@ -456,6 +456,7 @@ export const insertEdge = function (elem, e, edge, clusterDb, diagramType, graph
curve = edge.curve;
}
// The offsets are calculated from the markers' dimensions.
const markerOffsets = {
aggregation: 18,
extension: 18,
@@ -468,9 +469,14 @@ export const insertEdge = function (elem, e, edge, clusterDb, diagramType, graph
.x(function (d, i, data) {
let offset = 0;
if (i === 0 && Object.hasOwn(markerOffsets, edge.arrowTypeStart)) {
// Handle first point
// Calculate the angle and delta between the first two points
const { angle, deltaX } = calculateDeltaAndAngle(data[0], data[1]);
// Calculate the offset based on the angle and the marker's dimensions
offset = markerOffsets[edge.arrowTypeStart] * Math.cos(angle) * (deltaX >= 0 ? 1 : -1) || 0;
} else if (i === data.length - 1 && Object.hasOwn(markerOffsets, edge.arrowTypeEnd)) {
// Handle last point
// Calculate the angle and delta between the last two points
const { angle, deltaX } = calculateDeltaAndAngle(
data[data.length - 1],
data[data.length - 2]
@@ -480,6 +486,7 @@ export const insertEdge = function (elem, e, edge, clusterDb, diagramType, graph
return d.x + offset;
})
.y(function (d, i, data) {
// Same handling as X above
let offset = 0;
if (i === 0 && Object.hasOwn(markerOffsets, edge.arrowTypeStart)) {
const { angle, deltaY } = calculateDeltaAndAngle(data[0], data[1]);