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Fix connecting adjacent vertices

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Can't unconditionally delete the node; it may be a member
of other ways.

I didn't preserve the behavior of dragging a midpoint to
an adjacent node being a no-op. In general we don't try to
eliminate compound operations whose net result is a no-op;
I don't think it's important to do so for this special case.

The degenerate case of connecting the endpoints of a two-vertex
line now results in a point. This is what naturally resulted
from the code, and seems ok.

Fixes #983.
This commit is contained in:
John Firebaugh
2013-03-12 16:21:12 -07:00
parent 3b3ee84a84
commit 4fa88acc85
3 changed files with 73 additions and 17 deletions
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test/spec/actions/connect.js
+69
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@@ -78,6 +78,75 @@ describe("iD.actions.Connect", function() {
expect(graph.entity('-').nodes).to.eql(['d', 'b', 'c', 'd']);
});
it("merges adjacent nodes", function() {
// a --- b --- c
//
// Connect [b, c]
//
// Expected result:
//
// a --- c
//
var graph = iD.Graph({
'a': iD.Node({id: 'a'}),
'b': iD.Node({id: 'b'}),
'c': iD.Node({id: 'c'}),
'-': iD.Way({id: '-', nodes: ['a', 'b', 'c']})
});
graph = iD.actions.Connect(['b', 'c'])(graph);
expect(graph.entity('-').nodes).to.eql(['a', 'c']);
expect(graph.entity('b')).to.be.undefined;
});
it("merges adjacent nodes with connections", function() {
// a --- b --- c
// |
// d
//
// Connect [b, c]
//
// Expected result:
//
// a --- c
// |
// d
//
var graph = iD.Graph({
'a': iD.Node({id: 'a'}),
'b': iD.Node({id: 'b'}),
'c': iD.Node({id: 'c'}),
'd': iD.Node({id: 'c'}),
'-': iD.Way({id: '-', nodes: ['a', 'b', 'c']}),
'|': iD.Way({id: '|', nodes: ['b', 'd']})
});
graph = iD.actions.Connect(['b', 'c'])(graph);
expect(graph.entity('-').nodes).to.eql(['a', 'c']);
expect(graph.entity('|').nodes).to.eql(['c', 'd']);
expect(graph.entity('b')).to.be.undefined;
});
it("deletes a degenerate way", function() {
// a --- b
//
// Connect [a, b]
//
var graph = iD.Graph({
'a': iD.Node({id: 'a'}),
'b': iD.Node({id: 'b'}),
'-': iD.Way({id: '-', nodes: ['a', 'b']})
});
graph = iD.actions.Connect(['a', 'b'])(graph);
expect(graph.entity('a')).to.be.undefined;
expect(graph.entity('-')).to.be.undefined;
});
it("merges tags to the surviving node", function() {
var graph = iD.Graph({
'a': iD.Node({id: 'a', tags: {a: 'a'}}),