Refactoring of schema graph

[bfrgottscma]

@ruegenbfr could you please structure the task into tickets?

Structuring idea:

test

• test virtual-zoom-cy-graph (is layouting working with fixed zoom?)

update/ create cyWrapper api

• (create alternative cy-graph that updates font size, node size, edge width according to zoom)
• create layoutable-cy-graph: add api that supports layouting
• extend layoutable-cy-graph: provide layout options
• add schema-graph.service that provides schemagraph specific content and handles node coordinates/station coordinates conversion and provides missing coordinates

restore feature hover elements

• extend store: add hover elements
• extend get*GraphData selectors to contain hover elements
• create hover actions
• create hover elements reducer
• extend GraphState interface: add hover elements
• extend GraphServiceData interface: add hover elements
• extend GraphService: provide hover elements
• extend *cy-graph api to accept hover elements
• extend *cy-graph api to highlight hover elements
• change station property dialog initialization (remove hovering observer)
• change station property dialog hover handling replace hover emit by hover actions dispatching

restore/refine feature ghost elements

• update/refine store: refine ghost elements
• update/refine get*GraphData selectors to contain ghost elements
• update ghost actions
• update ghost elements reducer
• extend GraphState interface: add ghost elements
• extend GraphServiceData interface: add ghost elements
• extend/modify GraphService: provide ghost elements
• extend SchemaGraphService: provide ghost positions
• extend SchemaGraphService: handle ghost elements
• extend *cy-graph api to accept ghost elements
• extend *cy-graph to show ghost elements

create parallel infrastructure

• rename old schema-graph container
• create new schema-graph container

update context menu handling:

• provide LayoutOptionsList and layoutTrigger in GraphViewComponent
• merge menu item data from context menu service and graph view component

clean up parallel infrastructure

• remove graph-context-menu container
• remove old schema-graph container

[ruegenbfr]

Background:

The graph framework we are using supports only zoom dependent elements/test sizes/widths. To make node and font size and edge width zoom independent the commit to ticket #198 changes font size, node size, edge width size in the background to fake zoom independence. (e.g. given a zoom level of 10:1 and font size of 12 in the background a font size of 1.2 was used). However, this mechanism has drawbacks: the graph framework has an internal absolute minimum size for arrow heads. The text labels show browser dependent artifacts (cut off/overlays) for very small font sizes and the 'background' sizes mess up layouting algorithms respecting individual node sizes. (as F2F)

Solution:

The refactoring introduces a graph framework independent virtual zooming mechanism.

To test:

• zooming behavior
• zoom fitting
• layouting complete graphs or subgraphs