First commit.

Signed-off-by: Chen Xiao <abigwc@gmail.com>

client/node_modules/cytoscape/src/collection/dimensions/edge-points.mjs

@@ -0,0 +1,56 @@
+import * as math from '../../math.mjs';
+
+const ifEdge = (ele, getValue) => {
+  if( ele.isEdge() && ele.takesUpSpace() ){
+    return getValue( ele );
+  }
+};
+
+const ifEdgeRenderedPosition = (ele, getPoint) => {
+  if( ele.isEdge() && ele.takesUpSpace() ){
+    let cy = ele.cy();
+
+    return math.modelToRenderedPosition( getPoint( ele ), cy.zoom(), cy.pan() );
+  }
+};
+
+const ifEdgeRenderedPositions = (ele, getPoints) => {
+  if( ele.isEdge() && ele.takesUpSpace() ){
+    let cy = ele.cy();
+    let pan = cy.pan();
+    let zoom = cy.zoom();
+
+    return getPoints( ele ).map( p => math.modelToRenderedPosition( p, zoom, pan ) );
+  }
+};
+
+const controlPoints = ele => ele.renderer().getControlPoints( ele );
+const segmentPoints = ele => ele.renderer().getSegmentPoints( ele );
+const sourceEndpoint = ele => ele.renderer().getSourceEndpoint( ele );
+const targetEndpoint = ele => ele.renderer().getTargetEndpoint( ele );
+const midpoint = ele => ele.renderer().getEdgeMidpoint( ele );
+
+const pts = {
+  controlPoints: { get: controlPoints, mult: true },
+  segmentPoints: { get: segmentPoints, mult: true },
+  sourceEndpoint: { get: sourceEndpoint },
+  targetEndpoint: { get: targetEndpoint },
+  midpoint: { get: midpoint }
+};
+
+const renderedName = name => 'rendered' + name[0].toUpperCase() + name.substr(1);
+
+export default Object.keys( pts ).reduce( ( obj, name ) => {
+  let spec = pts[ name ];
+  let rName = renderedName( name );
+
+  obj[ name ] = function(){ return ifEdge( this, spec.get ); };
+
+  if( spec.mult ){
+    obj[ rName ] = function(){ return ifEdgeRenderedPositions( this, spec.get ); };
+  } else {
+    obj[ rName ] = function(){ return ifEdgeRenderedPosition( this, spec.get ); };
+  }
+
+  return obj;
+}, {} );