Edges

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Overview
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Edges
Caption
By default, only the edge label is shown.
To show edge IDs or node labels, you can set id or label, respectively. To show values of edge properties, you can list the node properties.
Show edge IDs, edge labels, and the values of since property.
  edge: {
    caption: ['id', 'label', 'since'],
  },
Color
By default, edge colors are selected automatically based on labels.
To set custom colors, you can fill color string values or select the edge properties which hold color string values.
Set a single color for all edges with any label.
    color: 'red',
Set single colors for the edges with particular labels.
    color: {
      'person': 'red',
      'car': 'blue',
    },
Set the values of color property for all edges with any label.
    color: '@color',
The combination of the above. 
    color: {
      'person': 'red',
      'car': '@color',
    },
Opacity
By default, edge opacity is set to 1 (= not transparent at all).
To set opacity, you can set opacity number values or select the edge properties which hold opacity number values.
Set opacity for all nodes with any label.
    opacity: 0.5,
Set opacity for the nodes with particular labels.
    opacity: {
      'person': 0.5,
      'car': 0.8,
    },
Set the values of opacity property for all nodes with any label.
    opacity: '@opacity',
The combination of the above. 
    opacity: {
      'person': 0.5,
      'car': '@opacity',
    },`
Saturation
By default, edge saturation is set to 100% (= fully colorful).
To set saturation, you can set opacity number values or select the edge properties which hold opacity number values.
Set saturation for all nodes with any label.
    saturation: '100%',
For setting by labels or using property values, please see the Color section. 
Brightness
By default, edge brightness is set to 37%.
To set brightness, you can set opacity number values or select the edge properties which hold opacity number values.
Set brightness for all nodes with any label.
    brightness: '37%',
For setting by labels or using property values, please see the Color section.
Width
By default, edge width is set to 1.
To set width, you can set width number values or select the edge properties which hold opacity number values.
Set width for all edges with any label.
    width: 2,
For setting by labels or using property values, please see the Color section. 
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