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59 lines
1.7 KiB
Markdown
59 lines
1.7 KiB
Markdown
# Graphoon
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A force directed algorithm written in Lua.
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## Basic Usage
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The basic idea is that you create a new graph object, to which you can then add nodes and edges.
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```
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local GraphLibrary = require('Graphoon').Graph
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graph = GraphLibrary.new()
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graph:addNode( "Ash Williams" )
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graph:addNode( "Necronomicon" )
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graph:connectIDs( "Ash Williams", "Necronomicon" )
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```
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By itself Graphoon only provides functionality for creating the graph and calculating the layout based on physical attraction and repulsion forces.
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It provides a ```draw``` and ```update``` function, which can be used to easily write your own rendering code.
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The ```draw``` function should be called with two callback functions. The first callback will be used for all nodes and the second one for all the edges.
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```
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graph:draw( function( node )
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local x, y = node:getPosition()
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drawCircle( 'fill', x, y, 10 )
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end,
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function( edge )
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local ox, oy = edge.origin:getPosition()
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local tx, ty = edge.target:getPosition()
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drawLine( ox, oy, tx, ty )
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end)
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```
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At its simplest the force calculations can be updated via ```graph:update( dt )```, but the ```update``` function also can receive optional callbacks for both nodes and edges.
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## Advanced usage
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### Using anchors
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Anchors can be used to attach a node to a certain position on the screen. This can be useful if you want to center a certain node for example.
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This can either be done directly via the constructor of the node:
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```
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-- Anchor the node to the center of the screen.
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graph:addNode( "Ash Williams", screenX * 0.5, screenY * 0.5, true )
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```
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Or by using the ```setAnchor``` function:
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```
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-- Invert anchor status
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node:setAnchor( not node:isAnchor() )
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```
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