## Controlling Class Layout
Layout is determined dymanically, so can be tricky if you are trying to get a specific layout, but you can usually beat it into submission with a combination of the following:
class1 -> class2 ' horizontal placement
class2 --> class3 ' vertical placement
class4 -left-> class4 ' left placement
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stroke-width: 1.5;" x1="87" x2="130" y1="48" y2="48"/> <rect fill="#FEFECE" filter="url(#f1)" height="48" style="stroke: #A80036; stroke-width: 1.5;" width="45" x="86" y="116"/> <ellipse cx="101" cy="132" fill="#ADD1B2" rx="11" ry="11" style="stroke: #A80036; stroke-width: 1.0;"/> <path d="M98.9063,131.8438 Q98.9063,133.7188 99.4844,134.7266 Q100.0625,135.7344 101.2188,135.7344 Q102.5625,135.7344 103.2188,133.7188 L105.4844,134.1406 Q104.375,137.6719 101.2031,137.6719 Q98.8594,137.6719 97.6406,136.1875 Q96.4219,134.7031 96.4219,131.8438 Q96.4219,126.125 101.125,126.125 Q102.6719,126.125 103.7109,126.9375 Q104.75,127.75 105.25,129.3594 L102.9844,129.9063 Q102.75,129.0313 102.2656,128.5391 Q101.7813,128.0469 101.1563,128.0469 Q98.9063,128.0469 98.9063,131.8438 Z "/> <text fill="#000000" font-family="sans-serif" font-size="12" lengthAdjust="spacingAndGlyphs" textLength="13" x="115" y="136.6553">c3</text> <line style="stroke: #A80036; stroke-width: 1.5;" x1="87" x2="130" y1="148" y2="148"/> <line style="stroke: #A80036; stroke-width: 1.5;" x1="87" x2="130" y1="156" y2="156"/> <rect fill="#FEFECE" filter="url(#f1)" height="48" style="stroke: #A80036; stroke-width: 1.5;" width="45" x="6" y="116"/> <ellipse cx="21" cy="132" fill="#ADD1B2" rx="11" ry="11" style="stroke: #A80036; stroke-width: 1.0;"/> <path d="M18.9063,131.8438 Q18.9063,133.7188 19.4844,134.7266 Q20.0625,135.7344 21.2188,135.7344 Q22.5625,135.7344 23.2188,133.7188 L25.4844,134.1406 Q24.375,137.6719 21.2031,137.6719 Q18.8594,137.6719 17.6406,136.1875 Q16.4219,134.7031 16.4219,131.8438 Q16.4219,126.125 21.125,126.125 Q22.6719,126.125 23.7109,126.9375 Q24.75,127.75 25.25,129.3594 L22.9844,129.9063 Q22.75,129.0313 22.2656,128.5391 Q21.7813,128.0469 21.1563,128.0469 Q18.9063,128.0469 18.9063,131.8438 Z "/> <text fill="#000000" font-family="sans-serif" font-size="12" lengthAdjust="spacingAndGlyphs" textLength="13" x="35" y="136.6553">c4</text> <line style="stroke: #A80036; stroke-width: 1.5;" x1="7" x2="50" y1="148" y2="148"/> <line style="stroke: #A80036; stroke-width: 1.5;" x1="7" x2="50" y1="156" y2="156"/> <path d="M51.3125,32 C61.0776,32 70.8427,32 80.6078,32 " fill="none" style="stroke: #A80036; stroke-width: 1.0;"/> <polygon fill="#A80036" points="85.7144,32,76.7144,28,80.7144,32,76.7144,36,85.7144,32" style="stroke: #A80036; stroke-width: 1.0;"/> <path d="M108.5,56 C108.5,72.003 108.5,93.4461 108.5,110.528 " fill="none" style="stroke: #A80036; stroke-width: 1.0;"/> <polygon fill="#A80036" points="108.5,115.6784,112.5,106.6784,108.5,110.6784,104.5,106.6784,108.5,115.6784" style="stroke: #A80036; stroke-width: 1.0;"/> <path d="M56.419,140 C66.1841,140 75.9492,140 85.7144,140 " fill="none" style="stroke: #A80036; stroke-width: 1.0;"/> <polygon fill="#A80036" points="51.3125,140,60.3125,144,56.3125,140,60.3125,136,51.3125,140" style="stroke: #A80036; stroke-width: 1.0;"/> </g></svg>
You can use `left` , `right`, `up`, and `down` to control placement direction.
If adding a link screws up the class placement you can use `[norank]` to exclude the link from the layout process:
' link will not affect class placement
c4 -[norank]-> c2
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stroke-width: 1.5;" x1="87" x2="130" y1="48" y2="48"/> <rect fill="#FEFECE" filter="url(#f1)" height="48" style="stroke: #A80036; stroke-width: 1.5;" width="45" x="86" y="116"/> <ellipse cx="101" cy="132" fill="#ADD1B2" rx="11" ry="11" style="stroke: #A80036; stroke-width: 1.0;"/> <path d="M98.9063,131.8438 Q98.9063,133.7188 99.4844,134.7266 Q100.0625,135.7344 101.2188,135.7344 Q102.5625,135.7344 103.2188,133.7188 L105.4844,134.1406 Q104.375,137.6719 101.2031,137.6719 Q98.8594,137.6719 97.6406,136.1875 Q96.4219,134.7031 96.4219,131.8438 Q96.4219,126.125 101.125,126.125 Q102.6719,126.125 103.7109,126.9375 Q104.75,127.75 105.25,129.3594 L102.9844,129.9063 Q102.75,129.0313 102.2656,128.5391 Q101.7813,128.0469 101.1563,128.0469 Q98.9063,128.0469 98.9063,131.8438 Z "/> <text fill="#000000" font-family="sans-serif" font-size="12" lengthAdjust="spacingAndGlyphs" textLength="13" x="115" y="136.6553">c3</text> <line style="stroke: #A80036; stroke-width: 1.5;" x1="87" x2="130" y1="148" y2="148"/> <line style="stroke: #A80036; stroke-width: 1.5;" x1="87" x2="130" y1="156" y2="156"/> <rect fill="#FEFECE" filter="url(#f1)" height="48" style="stroke: #A80036; stroke-width: 1.5;" width="45" x="6" y="116"/> <ellipse cx="21" cy="132" fill="#ADD1B2" rx="11" ry="11" style="stroke: #A80036; stroke-width: 1.0;"/> <path d="M18.9063,131.8438 Q18.9063,133.7188 19.4844,134.7266 Q20.0625,135.7344 21.2188,135.7344 Q22.5625,135.7344 23.2188,133.7188 L25.4844,134.1406 Q24.375,137.6719 21.2031,137.6719 Q18.8594,137.6719 17.6406,136.1875 Q16.4219,134.7031 16.4219,131.8438 Q16.4219,126.125 21.125,126.125 Q22.6719,126.125 23.7109,126.9375 Q24.75,127.75 25.25,129.3594 L22.9844,129.9063 Q22.75,129.0313 22.2656,128.5391 Q21.7813,128.0469 21.1563,128.0469 Q18.9063,128.0469 18.9063,131.8438 Z "/> <text fill="#000000" font-family="sans-serif" font-size="12" lengthAdjust="spacingAndGlyphs" textLength="13" x="35" y="136.6553">c4</text> <line style="stroke: #A80036; stroke-width: 1.5;" x1="7" x2="50" y1="148" y2="148"/> <line style="stroke: #A80036; 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You can also use `[hidden]` to create invisible links solely for the purpose of influencing the layout. Repeating them will increase the likelihood that the classes will be placed closer and even be aligned with each other:
' place c2 and c4 closer together
c2 -[hidden]-> c4
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' repeated again to place c2 and c4 even closer
c2 -[hidden]-> c4
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Note that although the links are hidden they still affecting the drawing of links on the same path. If you temporarily remove the `[hidden]` option you can see what is going on:
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You can fiddle with the ordering and direction to ensure the one that is being drawn is in the place that you want it (usually in the middle). The trick is to use identical links with the same class ordering and direction. If you want the link drawn in the opposite direction you can't flip the order of the classes - you need to swap the placement of the arrow:
' place c2 and c4 closer
c2 -[hidden]- c4
' draw the actual link between the hidden links
c2 <-[norank]- c4
' place c2 and c4 even closer
c2 -[hidden]- c4
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stroke-width: 1.5;" x1="87" x2="130" y1="156" y2="156"/> <path d="M51.3125,32 C61.0776,32 70.8427,32 80.6078,32 " fill="none" style="stroke: #A80036; stroke-width: 1.0;"/> <polygon fill="#A80036" points="85.7144,32,76.7144,28,80.7144,32,76.7144,36,85.7144,32" style="stroke: #A80036; stroke-width: 1.0;"/> <path d="M125.859,56 C138.144,72.2789 154.679,94.1871 167.676,111.4076 " fill="none" style="stroke: #A80036; stroke-width: 1.0;"/> <polygon fill="#A80036" points="170.899,115.6784,168.6705,106.085,167.8871,111.6873,162.2848,110.904,170.899,115.6784" style="stroke: #A80036; stroke-width: 1.0;"/> <path d="M136.419,140 C146.184,140 155.949,140 165.714,140 " fill="none" style="stroke: #A80036; stroke-width: 1.0;"/> <polygon fill="#A80036" points="131.312,140,140.312,144,136.312,140,140.312,136,131.312,140" style="stroke: #A80036; stroke-width: 1.0;"/> <path d="M108.5,61.131 C108.5,78.1538 108.5,99.6037 108.5,115.6784 " fill="none" style="stroke: #A80036; stroke-width: 1.0;"/> <polygon fill="#A80036" points="108.5,56,104.5,65,108.5,61,112.5,65,108.5,56" style="stroke: #A80036; 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### General Layout Tips
Understanding how the layout engine works (GraphVis) makes it easier to get what you want. The previous example with the `[hidden]` and `[norank]` links got weird because we were giving the layout engine conflicting information.
The layout is determined by the order that classes occur. Classes are drawn at the top of the document have higher ranking than those below.
The rank is determined by:
- The order in which classes are added to the diagram
- The layout hints (horizontal, vertical, left, right, up, down)
- The direction in which the links are defined. The class on the left has higher rank than the one on the right: `higher -> lower`
Link direction can have a dramatic impact. If we add a `c4 --> c2` link we confuse the engine by having `c4` on the left which gives it a higher ranking than `c2` and causes the diagram to flip upside down:
class c1
c1 -> c2
c2 --> c3
c3 -left-> c4
' whoops, this flips the diagram on its head
c4 --> c2
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Drawing links from the top down prevents this re-ranking problem, and means you don't have to use `[norank]` as often. Since the arrow direction has no effect on the layout we can just flip the end that the arrow is drawn at to account for the link being in a different order:
' ranking maintained, so layout isn't dramatically affected
' arrow drawn at opposite end to account for reverse order
c2 <-- c4
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We could have also used the `up` layout hint to prevent the re-ranking:
c4 -up-> c2
## Layout Direction
You can change the ranking direction from vertical to horizontal using `left to right direction`:
left to right direction
class c1
c1 -> c2
c2 --> c3
c3 -left-> c4
c2 <-- c4
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This also changes the meaning of the layout hints. Horizontal hints become vertical, etc.
## Spacing
You can control the spacing between class using the `NodeSep` and `RankSep` skinparams.
SkinParam {
NodeSep 45 ' horizontal spacing
RankSep 45 ' vertical spacing
}
