StackGenVis: Alignment of Data, Algorithms, and Models for Stacking Ensemble Learning Using Performance Metrics
https://doi.org/10.1109/TVCG.2020.3030352
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75 lines
2.1 KiB
75 lines
2.1 KiB
4 years ago
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simplify-planar-graph
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=====================
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Simplifies a planar graph by removing small or nearly flat corners.
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# Example
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```javascript
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var simplify = require("simplify-planar-graph")
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//Create a circle
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var positions = []
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var edges = []
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for(var i=0; i<100; ++i) {
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var theta = i / 100 * Math.PI * 2.0
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positions.push([Math.cos(theta), Math.sin(theta)])
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edges.push([i, (i+1)%100])
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}
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//Simplify it
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console.log(simplify(edges, positions, 0.1))
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```
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Output:
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```javascript
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{ positions:
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[ [ 0.9921147013144779, 0.12533323356430426 ],
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[ 0.8090169943749475, 0.5877852522924731 ],
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[ 0.48175367410171516, 0.8763066800438637 ],
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[ -0.30901699437494734, 0.9510565162951536 ],
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[ -0.7705132427757891, 0.6374239897486899 ],
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[ -0.9980267284282716, 0.06279051952931358 ],
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[ -0.9510565162951535, -0.30901699437494773 ],
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[ -0.5877852522924732, -0.8090169943749473 ],
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[ -0.18738131458572463, -0.9822872507286887 ],
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[ 0.535826794978996, -0.8443279255020155 ],
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[ 0.7705132427757894, -0.6374239897486896 ] ],
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edges:
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[ [ 0, 1 ],
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[ 1, 2 ],
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[ 2, 3 ],
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[ 3, 4 ],
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[ 4, 5 ],
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[ 10, 0 ],
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[ 5, 6 ],
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[ 6, 7 ],
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[ 7, 8 ],
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[ 8, 9 ],
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[ 9, 10 ] ] }
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```
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# Install
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```
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npm install simplify-planar-graph
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```
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# API
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#### `require("simplify-planar-graph")(edges, positions, tolerance)`
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Simplies a planar graph to a given tolerance
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* `edges` are the edges of the graph represented by pairs of vertex indices
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* `positions` is a list of vertex coordinates encoded as an array of 2D arrays
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* `tolerance` controls the target aspect ratio of the corners of the mesh
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**Returns** A new planar graph encoded as a JSON object with two properties:
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* `edges` is an array of edges encoded as pairs of indices
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* `positions` is an array of positions for the simplicial complex
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**Note** The current implementation does not detect the removal of features which cross existing line segments. Picking a high tolerance value may result in destroying the planarity of the resulting graph. Eventually if it becomes a priority I may go back and implement code to detect and handle these cases.
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# Credits
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(c) 2014 Mikola Lysenko. MIT License
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