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| 1 | +# Node Flow |
| 2 | + |
| 3 | +Another Flow-based Node graph Library. |
| 4 | + |
| 5 | +Check it out [here](https://elicdavis.github.io/node-flow/). |
| 6 | + |
| 7 | + |
| 8 | + |
| 9 | +## About |
| 10 | + |
| 11 | +Node Flow is a javascript library that enables developers to build node based tools similar to Unreal Blueprints or Blender Nodes. |
| 12 | + |
| 13 | +## Features |
| 14 | + |
| 15 | +* Nodes |
| 16 | +* Markdown Notes |
| 17 | +* More Nodes |
| 18 | + |
| 19 | +## Install |
| 20 | + |
| 21 | +Download the latest build [here](https://raw.githubusercontent.com/EliCDavis/node-flow/gh-pages/dist/web/NodeFlow.js). |
| 22 | + |
| 23 | +## API |
| 24 | + |
| 25 | +### Graph API |
| 26 | + |
| 27 | +#### Creation |
| 28 | + |
| 29 | +The only requirement for creating a graph is providing it an instance of a [canvas](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/canvas). |
| 30 | + |
| 31 | +```javascript |
| 32 | +// Create a canvas to render our graph to |
| 33 | +var canvas = document.createElement("canvas"); |
| 34 | + |
| 35 | +// Create our Node Flow Graph |
| 36 | +var graph = new NodeFlowGraph(canvas) |
| 37 | +``` |
| 38 | + |
| 39 | +There are a bunch of optional parameters you can provide the graph: |
| 40 | + |
| 41 | +```javascript |
| 42 | +var graph = new NodeFlowGraph(canvas, { |
| 43 | + // Background color of the graph. |
| 44 | + backgroundColor: "#FF5500", |
| 45 | + |
| 46 | + // You can add extra items to the context |
| 47 | + // menu that pops up when you right click. |
| 48 | + contextMenu: { |
| 49 | + subMenus: [ |
| 50 | + { |
| 51 | + // Text that shows up in the context |
| 52 | + // menu |
| 53 | + name: "Example Context Menu Item", |
| 54 | + |
| 55 | + // This is recursive. We can nest as |
| 56 | + // many submenus within eachother as |
| 57 | + // we want. This field is optional. |
| 58 | + subMenus: [], |
| 59 | + |
| 60 | + items: [ |
| 61 | + { |
| 62 | + name: "Sub menu Item!!!" |
| 63 | + } |
| 64 | + ] |
| 65 | + } |
| 66 | + ], |
| 67 | + |
| 68 | + // Items that show up at the base of the |
| 69 | + // context menu |
| 70 | + items: [ |
| 71 | + { |
| 72 | + // Text that shows up in the context |
| 73 | + // menu |
| 74 | + name: "Example Context Menu Item", |
| 75 | + |
| 76 | + // Function that get's executed when |
| 77 | + // Item is clicked. |
| 78 | + callback: () => { |
| 79 | + alert("Example Context Menu Item"); |
| 80 | + } |
| 81 | + } |
| 82 | + ] |
| 83 | + }, |
| 84 | + |
| 85 | + // Notes we want rendered on the graph. |
| 86 | + board: { |
| 87 | + notes: [ |
| 88 | + { |
| 89 | + // Where to render the note |
| 90 | + position: { x: 20, y: 20 }, |
| 91 | + |
| 92 | + // Whether or not the note can be |
| 93 | + // interacted with on the graph |
| 94 | + locked: true, |
| 95 | + |
| 96 | + // Markdown enabled text |
| 97 | + text: ` |
| 98 | + # My First note!!! |
| 99 | +
|
| 100 | + Not sure what to write here |
| 101 | + ` |
| 102 | + }, |
| 103 | + ] |
| 104 | + }, |
| 105 | +}); |
| 106 | +``` |
| 107 | + |
| 108 | +### Node API |
| 109 | + |
| 110 | +#### Creation |
| 111 | + |
| 112 | +```javascript |
| 113 | +// All nodes require a title. That's about it. |
| 114 | +var node = new FlowNode({ |
| 115 | + title: "My First Node!", |
| 116 | +}); |
| 117 | + |
| 118 | +// Be sure to add it to the graph so it can be rendered. |
| 119 | +graph.addNode(node); |
| 120 | +``` |
| 121 | + |
| 122 | +#### Inputs and Outputs |
| 123 | + |
| 124 | +Create a Add node that takes two numbers and outputs a single number |
| 125 | + |
| 126 | +```javascript |
| 127 | +var node = new FlowNode({ |
| 128 | + title: "Add", |
| 129 | + inputs: [ |
| 130 | + { name: "a", type: "float32" }, |
| 131 | + { name: "b", type: "float32" } |
| 132 | + ], |
| 133 | + outputs: [ |
| 134 | + { name: "sum", type: "float32" } |
| 135 | + ], |
| 136 | +}); |
| 137 | +``` |
| 138 | + |
| 139 | +You can also add additional inputs and outputs to the node after it's been created |
| 140 | + |
| 141 | +```javascript |
| 142 | +node.addInput({ name: "c", type: "float32" }) |
| 143 | +node.addOutput({ name: "sum", type: "float32" }) |
| 144 | +``` |
| 145 | + |
| 146 | +## Library Development |
| 147 | + |
| 148 | +Just run |
| 149 | + |
| 150 | +```bash |
| 151 | +npm run watch-dev |
| 152 | +``` |
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