Load it into the editor with this link: https://vega.github.io/editor/#/gist/vega/domoritz/93f0a78264516930211b9f047d53d7a3
Open in blockbuilder: http://blockbuilder.org/domoritz/93f0a78264516930211b9f047d53d7a3
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November 26, 2017 13:10
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| license: mit |
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| <!DOCTYPE html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <script src="https://cdnjs.cloudflare.com/ajax/libs/vega/3.0.7/vega.js"></script> | |
| <script src="https://cdnjs.cloudflare.com/ajax/libs/vega-embed/3.0.0-rc7/vega-embed.js"></script> | |
| <style> | |
| body { | |
| font-family: sans-serif; | |
| } | |
| .vega-actions a { | |
| padding: 0.2em; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <div id="vis"></div> | |
| <script> | |
| const spec = "spec.json"; | |
| vegaEmbed('#vis', spec, {actions: false}); | |
| </script> | |
| </body> |
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| { | |
| "$schema": "https://vega.github.io/schema/vega/v3.0.json", | |
| "width": 400, | |
| "height": 200, | |
| "padding": 5, | |
| "signals": [ | |
| { | |
| "name": "count", | |
| "bind": { | |
| "input": "range", | |
| "min": 3, | |
| "max": 200 | |
| }, | |
| "value": 20 | |
| } | |
| ], | |
| "data": [ | |
| { | |
| "name": "table", | |
| "transform": [ | |
| { | |
| "type": "sequence", | |
| "start": 0, | |
| "stop": {"signal": "count"} | |
| }, | |
| { | |
| "type": "formula", | |
| "expr": "datum.data", | |
| "as": "x" | |
| }, | |
| { | |
| "type": "formula", | |
| "expr": "random()", | |
| "as": "y" | |
| }, | |
| { | |
| "type": "window", | |
| "sort": {"field": "x", "order": "ascending"}, | |
| "ops": ["lag", "lag"], | |
| "fields": ["y", "x"], | |
| "as": ["prev_y", "prev_x"] | |
| }, | |
| { | |
| "type": "filter", | |
| "expr": "datum.prev_x || datum.prev_y" | |
| }, | |
| { | |
| "type": "formula", | |
| "expr": "sqrt(pow(datum.y - datum.prev_y, 2) + pow(datum.x - datum.prev_x, 2))", | |
| "as": "segment_length" | |
| }, | |
| { | |
| "type": "formula", | |
| "expr": "datum.segment_length / (datum.x - datum.prev_x)", | |
| "as": "normalizer" | |
| } | |
| ] | |
| } | |
| ], | |
| "scales": [ | |
| { | |
| "name": "x", | |
| "type": "linear", | |
| "range": "width", | |
| "domain": {"data": "table", "fields": ["prev_x", "x"]} | |
| }, | |
| { | |
| "name": "y", | |
| "type": "linear", | |
| "range": "height", | |
| "nice": true, | |
| "zero": true, | |
| "domain": {"data": "table", "fields": ["prev_y", "y"]} | |
| }, | |
| { | |
| "name": "color", | |
| "type": "sequential", | |
| "range": "ramp", | |
| "domain": {"data": "table", "field": "normalizer"}, | |
| "reverse": true, | |
| "zero": false | |
| }, | |
| { | |
| "name": "size", | |
| "type": "linear", | |
| "range": [1, 5], | |
| "domain": {"data": "table", "field": "normalizer"}, | |
| "zero": false, | |
| "reverse": true | |
| } | |
| ], | |
| "layout": { | |
| "padding": { | |
| "row": 10, | |
| "column": 10 | |
| }, | |
| "offset": 10, | |
| "columns": 1, | |
| "bounds": "full", | |
| "align": "each" | |
| }, | |
| "marks": [{ | |
| "type": "group", | |
| "encode": { | |
| "update": { | |
| "height": {"signal": "height"} | |
| } | |
| }, | |
| "axes": [ | |
| {"orient": "bottom", "scale": "x"}, | |
| {"orient": "left", "scale": "y"} | |
| ], | |
| "marks": [ | |
| { | |
| "type": "rule", | |
| "from": { | |
| "data": "table" | |
| }, | |
| "encode": { | |
| "enter": { | |
| "x": {"scale": "x", "field": "prev_x"}, | |
| "y": {"scale": "y", "field": "prev_y"}, | |
| "x2": {"scale": "x", "field": "x"}, | |
| "y2": {"scale": "y", "field": "y"}, | |
| "stroke": {"value": "steelblue"}, | |
| "strokeWidth": {"scale": "size", "field": "normalizer"} | |
| } | |
| } | |
| } | |
| ] | |
| }, { | |
| "type": "group", | |
| "encode": { | |
| "update": { | |
| "height": {"signal": "height"} | |
| } | |
| }, | |
| "axes": [ | |
| {"orient": "bottom", "scale": "x"}, | |
| {"orient": "left", "scale": "y"} | |
| ], | |
| "marks": [ | |
| { | |
| "type": "rule", | |
| "from": {"data": "table"}, | |
| "encode": { | |
| "enter": { | |
| "x": {"scale": "x", "field": "prev_x"}, | |
| "y": {"scale": "y", "field": "prev_y"}, | |
| "x2": {"scale": "x", "field": "x"}, | |
| "y2": {"scale": "y", "field": "y"}, | |
| "stroke": {"scale": "color", "field": "normalizer"}, | |
| "strokeWidth": {"value": 2} | |
| } | |
| } | |
| } | |
| ] | |
| }] | |
| } |
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