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vega 3.0 dataflow event stream outside of vega
Raw
.block
license: mit
Raw
index.html
<!DOCTYPE html>
<head>
<meta charset="utf-8">
<script src="https://unpkg.com/d3"></script>
<script src="https://unpkg.com/vega@3.0.2/build/vega-core.min.js"></script>
</head>
<body>
<div id = "vis"></div>
<pre id = "pre-hovered"></pre>
<script>
// spec from vega 3.0 examples
// https://github.com/uwdata/vega/blob/master/test/spec/bar-hover-label.vg.json
var spec = {
"width": 400,
"height": 200,
"padding": 5,
"signals": [
{
"name": "label",
"value": {"x": 0, "y": 0},
"on": [
{"events": "rect:mouseover", "update": "datum"},
{"events": "rect:mouseout", "update": "{x:0, y:0}"}
]
}
],
"data": [
{
"name": "table",
"values": [
{"x": 1, "y": 28}, {"x": 2, "y": 55},
{"x": 3, "y": 43}, {"x": 4, "y": 91},
{"x": 5, "y": 81}, {"x": 6, "y": 53},
{"x": 7, "y": 19}, {"x": 8, "y": 87},
{"x": 9, "y": 52}, {"x": 10, "y": 48},
{"x": 11, "y": 24}, {"x": 12, "y": 49},
{"x": 13, "y": 87}, {"x": 14, "y": 66},
{"x": 15, "y": 17}, {"x": 16, "y": 27},
{"x": 17, "y": 68}, {"x": 18, "y": 16},
{"x": 19, "y": 49}, {"x": 20, "y": 15}
]
}
],
"scales": [
{
"name": "xscale",
"type": "band",
"range": "width",
"domain": {"data": "table", "field": "x"}
},
{
"name": "yscale",
"type": "linear",
"range": "height",
"domain": {"data": "table", "field": "y"},
"nice": true
}
],
"axes": [
{"orient": "bottom", "scale": "xscale"},
{"orient": "left", "scale": "yscale"}
],
"marks": [
{
"type": "rect",
"from": {"data": "table"},
"encode": {
"enter": {
"x": {"scale": "xscale", "field": "x", "offset":1},
"width": {"scale": "xscale", "band": 1, "offset":-1},
"y": {"scale": "yscale", "field": "y"},
"y2": {"scale": "yscale", "value": 0}
},
"update": {
"fill": [
{"test": "datum === label", "value": "red"},
{"value": "steelblue"}
]
}
}
},
{
"type": "text",
"encode": {
"enter": {
"align": {"value": "center"},
"fill": {"value": "#333"}
},
"update": {
"x": {"scale": "xscale", "expr": "label.x", "band": 0.5},
"y": {"scale": "yscale", "expr": "label.y", "offset": -5},
"text": {"expr": "label.y"},
"fillOpacity": [
{"test": "!label._id", "value": 0},
{"value": 1}
]
}
}
}
]
};
var runtime = vega.parse(spec); // may throw an Error if parsing fails
var view = new vega.View(runtime)
.logLevel(vega.Warn) // set view logging level
.initialize(document.querySelector("#vis")) // set parent DOM element
.renderer("svg") // set render type (defaults to canvas)
.hover() // enable hover event processing
.run(); // update and render the view
// add a function to the dataflow to update pre with the hovered value
function hoverfollower(evt, val) {
d3.select("#pre-hovered").text(JSON.stringify(val));
};
// react to the label event stream
view.addSignalListener("label", hoverfollower);
</script>
</body>
Raw
vega-schema.json
{
"$schema": "http://json-schema.org/draft-04/schema#",
"title": "Vega 3.x Visualization Specification Language",
"defs": {
"axis": {
"type": "object",
"properties": {
"orient": {
"enum": [
"top",
"bottom",
"left",
"right"
]
},
"scale": {
"type": "string"
},
"title": {
"type": "string"
},
"zindex": {
"type": "number"
},
"interactive": {
"type": "boolean"
},
"domain": {
"type": "boolean"
},
"grid": {
"type": "boolean"
},
"tickSize": {
"type": "number"
},
"tickPadding": {
"type": "number"
},
"count": {
"oneOf": [
{
"type": "number"
},
{
"$ref": "#/refs/signal"
}
]
},
"format": {
"oneOf": [
{
"type": "string"
},
{
"$ref": "#/refs/signal"
}
]
},
"values": {
"oneOf": [
{
"type": "array"
},
{
"$ref": "#/refs/signal"
}
]
},
"offset": {
"oneOf": [
{
"type": "number"
},
{
"$ref": "#/refs/numberValue"
}
]
},
"position": {
"oneOf": [
{
"type": "number"
},
{
"$ref": "#/refs/numberValue"
}
]
},
"titlePadding": {
"oneOf": [
{
"type": "number"
},
{
"$ref": "#/refs/numberValue"
}
]
},
"minExtent": {
"oneOf": [
{
"type": "number"
},
{
"$ref": "#/refs/numberValue"
}
]
},
"maxExtent": {
"oneOf": [
{
"type": "number"
},
{
"$ref": "#/refs/numberValue"
}
]
},
"encode": {
"type": "object",
"properties": {
"ticks": {
"$ref": "#/defs/guideEncode"
},
"labels": {
"$ref": "#/defs/guideEncode"
},
"title": {
"$ref": "#/defs/guideEncode"
},
"grid": {
"$ref": "#/defs/guideEncode"
},
"axis": {
"$ref": "#/defs/guideEncode"
}
},
"additionalProperties": false
}
},
"additionalProperties": false,
"required": [
"orient",
"scale"
]
},
"background": {
"type": "string"
},
"data": {
"title": "Input data set definition",
"type": "object",
"allOf": [
{
"properties": {
"name": {
"type": "string"
},
"transform": {
"type": "array",
"items": {
"$ref": "#/defs/transform"
}
},
"on": {
"$ref": "#/defs/onTrigger"
},
"format": {
"type": "object",
"oneOf": [
{
"properties": {
"type": {
"enum": [
"json"
]
},
"parse": {
"oneOf": [
{
"enum": [
"auto"
]
},
{
"type": "object",
"additionalProperties": {
"enum": [
"number",
"boolean",
"date",
"string"
]
}
}
]
},
"property": {
"type": "string"
}
},
"additionalProperties": false
},
{
"properties": {
"type": {
"enum": [
"csv",
"tsv"
]
},
"parse": {
"oneOf": [
{
"enum": [
"auto"
]
},
{
"type": "object",
"additionalProperties": {
"enum": [
"number",
"boolean",
"date",
"string"
]
}
}
]
}
},
"additionalProperties": false
},
{
"properties": {
"type": {
"enum": [
"dsv"
]
},
"delimiter": {
"type": "string"
},
"parse": {
"oneOf": [
{
"enum": [
"auto"
]
},
{
"type": "object",
"additionalProperties": {
"enum": [
"number",
"boolean",
"date",
"string"
]
}
}
]
}
},
"additionalProperties": false
},
{
"oneOf": [
{
"properties": {
"type": {
"enum": [
"topojson"
]
},
"feature": {
"type": "string"
},
"property": {
"type": "string"
}
},
"additionalProperties": false
},
{
"properties": {
"type": {
"enum": [
"topojson"
]
},
"mesh": {
"type": "string"
},
"property": {
"type": "string"
}
},
"additionalProperties": false
}
]
}
]
}
},
"required": [
"name"
]
},
{
"anyOf": [
{
"required": [
"name"
]
},
{
"oneOf": [
{
"properties": {
"source": {
"type": "string"
}
},
"required": [
"source"
]
},
{
"properties": {
"values": {
"type": "array"
}
},
"required": [
"values"
]
},
{
"properties": {
"url": {
"type": "string"
}
},
"required": [
"url"
]
}
]
}
]
}
]
},
"rule": {
"type": "object",
"properties": {
"test": {
"type": "string"
}
}
},
"encodeEntry": {
"title": "Mark encode property set",
"type": "object",
"properties": {
"x": {
"$ref": "#/refs/numberValue"
},
"x2": {
"$ref": "#/refs/numberValue"
},
"xc": {
"$ref": "#/refs/numberValue"
},
"width": {
"$ref": "#/refs/numberValue"
},
"y": {
"$ref": "#/refs/numberValue"
},
"y2": {
"$ref": "#/refs/numberValue"
},
"yc": {
"$ref": "#/refs/numberValue"
},
"height": {
"$ref": "#/refs/numberValue"
},
"opacity": {
"$ref": "#/refs/numberValue"
},
"fill": {
"$ref": "#/refs/colorValue"
},
"fillOpacity": {
"$ref": "#/refs/numberValue"
},
"stroke": {
"$ref": "#/refs/colorValue"
},
"strokeWidth": {
"$ref": "#/refs/numberValue"
},
"strokeOpacity": {
"$ref": "#/refs/numberValue"
},
"strokeDash": {
"$ref": "#/refs/arrayValue"
},
"strokeDashOffset": {
"$ref": "#/refs/numberValue"
},
"cursor": {
"$ref": "#/refs/stringValue"
},
"clip": {
"$ref": "#/refs/booleanValue"
},
"size": {
"$ref": "#/refs/numberValue"
},
"shape": {
"anyOf": [
{
"type": "string"
},
{
"$ref": "#/refs/stringValue"
}
]
},
"path": {
"$ref": "#/refs/stringValue"
},
"innerRadius": {
"$ref": "#/refs/numberValue"
},
"outerRadius": {
"$ref": "#/refs/numberValue"
},
"startAngle": {
"$ref": "#/refs/numberValue"
},
"endAngle": {
"$ref": "#/refs/numberValue"
},
"interpolate": {
"$ref": "#/refs/stringValue"
},
"tension": {
"$ref": "#/refs/numberValue"
},
"orient": {
"oneOf": [
{
"type": "array",
"items": {
"allOf": [
{
"$ref": "#/defs/rule"
},
{
"type": "object",
"allOf": [
{
"$ref": "#/refs/stringModifiers"
},
{
"anyOf": [
{
"oneOf": [
{
"$ref": "#/refs/signal",
"required": [
"signal"
]
},
{
"$ref": "#/refs/expr",
"required": [
"expr"
]
},
{
"properties": {
"value": {}
},
"required": [
"value"
]
},
{
"properties": {
"field": {
"$ref": "#/refs/field"
}
},
"required": [
"field"
]
},
{
"properties": {
"range": {
"type": [
"number",
"boolean"
]
}
},
"required": [
"range"
]
}
]
},
{
"required": [
"band"
]
},
{
"required": [
"offset"
]
}
]
}
]
}
]
}
},
{
"type": "object",
"allOf": [
{
"$ref": "#/refs/stringModifiers"
},
{
"anyOf": [
{
"oneOf": [
{
"$ref": "#/refs/signal",
"required": [
"signal"
]
},
{
"$ref": "#/refs/expr",
"required": [
"expr"
]
},
{
"properties": {
"value": {}
},
"required": [
"value"
]
},
{
"properties": {
"field": {
"$ref": "#/refs/field"
}
},
"required": [
"field"
]
},
{
"properties": {
"range": {
"type": [
"number",
"boolean"
]
}
},
"required": [
"range"
]
}
]
},
{
"required": [
"band"
]
},
{
"required": [
"offset"
]
}
]
}
]
}
]
},
"url": {
"$ref": "#/refs/stringValue"
},
"align": {
"oneOf": [
{
"type": "array",
"items": {
"allOf": [
{
"$ref": "#/defs/rule"
},
{
"type": "object",
"allOf": [
{
"$ref": "#/refs/stringModifiers"
},
{
"anyOf": [
{
"oneOf": [
{
"$ref": "#/refs/signal",
"required": [
"signal"
]
},
{
"$ref": "#/refs/expr",
"required": [
"expr"
]
},
{
"properties": {
"value": {}
},
"required": [
"value"
]
},
{
"properties": {
"field": {
"$ref": "#/refs/field"
}
},
"required": [
"field"
]
},
{
"properties": {
"range": {
"type": [
"number",
"boolean"
]
}
},
"required": [
"range"
]
}
]
},
{
"required": [
"band"
]
},
{
"required": [
"offset"
]
}
]
}
]
}
]
}
},
{
"type": "object",
"allOf": [
{
"$ref": "#/refs/stringModifiers"
},
{
"anyOf": [
{
"oneOf": [
{
"$ref": "#/refs/signal",
"required": [
"signal"
]
},
{
"$ref": "#/refs/expr",
"required": [
"expr"
]
},
{
"properties": {
"value": {}
},
"required": [
"value"
]
},
{
"properties": {
"field": {
"$ref": "#/refs/field"
}
},
"required": [
"field"
]
},
{
"properties": {
"range": {
"type": [
"number",
"boolean"
]
}
},
"required": [
"range"
]
}
]
},
{
"required": [
"band"
]
},
{
"required": [
"offset"
]
}
]
}
]
}
]
},
"baseline": {
"oneOf": [
{
"type": "array",
"items": {
"allOf": [
{
"$ref": "#/defs/rule"
},
{
"type": "object",
"allOf": [
{
"$ref": "#/refs/stringModifiers"
},
{
"anyOf": [
{
"oneOf": [
{
"$ref": "#/refs/signal",
"required": [
"signal"
]
},
{
"$ref": "#/refs/expr",
"required": [
"expr"
]
},
{
"properties": {
"value": {}
},
"required": [
"value"
]
},
{
"properties": {
"field": {
"$ref": "#/refs/field"
}
},
"required": [
"field"
]
},
{
"properties": {
"range": {
"type": [
"number",
"boolean"
]
}
},
"required": [
"range"
]
}
]
},
{
"required": [
"band"
]
},
{
"required": [
"offset"
]
}
]
}
]
}
]
}
},
{
"type": "object",
"allOf": [
{
"$ref": "#/refs/stringModifiers"
},
{
"anyOf": [
{
"oneOf": [
{
"$ref": "#/refs/signal",
"required": [
"signal"
]
},
{
"$ref": "#/refs/expr",
"required": [
"expr"
]
},
{
"properties": {
"value": {}
},
"required": [
"value"
]
},
{
"properties": {
"field": {
"$ref": "#/refs/field"
}
},
"required": [
"field"
]
},
{
"properties": {
"range": {
"type": [
"number",
"boolean"
]
}
},
"required": [
"range"
]
}
]
},
{
"required": [
"band"
]
},
{
"required": [
"offset"
]
}
]
}
]
}
]
},
"text": {
"$ref": "#/refs/stringValue"
},
"dx": {
"$ref": "#/refs/numberValue"
},
"dy": {
"$ref": "#/refs/numberValue"
},
"radius": {
"$ref": "#/refs/numberValue"
},
"theta": {
"$ref": "#/refs/numberValue"
},
"angle": {
"$ref": "#/refs/numberValue"
},
"font": {
"$ref": "#/refs/stringValue"
},
"fontSize": {
"$ref": "#/refs/numberValue"
},
"fontWeight": {
"$ref": "#/refs/stringValue"
},
"fontStyle": {
"$ref": "#/refs/stringValue"
}
},
"additionalProperties": true
},
"encode": {
"type": "object",
"patternProperties": {
"^.+$": {
"$ref": "#/defs/encodeEntry"
}
},
"additionalProperties": false
},
"guideEncode": {
"type": "object",
"properties": {
"interactive": {
"type": "boolean",
"default": false
}
},
"patternProperties": {
"^(?!interactive).+$": {
"$ref": "#/defs/encodeEntry"
}
},
"additionalProperties": false
},
"legend": {
"type": "object",
"properties": {
"size": {
"type": "string"
},
"shape": {
"type": "string"
},
"fill": {
"type": "string"
},
"stroke": {
"type": "string"
},
"opacity": {
"type": "string"
},
"type": {
"enum": [
"gradient",
"symbol"
],
"default": "symbol"
},
"orient": {
"enum": [
"left",
"right",
"top-left",
"top-right",
"bottom-left",
"bottom-right"
],
"default": "right"
},
"title": {
"type": "string"
},
"zindex": {
"type": "number"
},
"interactive": {
"type": "boolean"
},
"offset": {
"oneOf": [
{
"type": "number"
},
{
"$ref": "#/refs/numberValue"
}
]
},
"padding": {
"oneOf": [
{
"type": "number"
},
{
"$ref": "#/refs/numberValue"
}
]
},
"titlePadding": {
"oneOf": [
{
"type": "number"
},
{
"$ref": "#/refs/numberValue"
}
]
},
"entryPadding": {
"oneOf": [
{
"type": "number"
},
{
"$ref": "#/refs/numberValue"
}
]
},
"count": {
"oneOf": [
{
"type": "number"
},
{
"$ref": "#/refs/signal"
}
]
},
"format": {
"oneOf": [
{
"type": "string"
},
{
"$ref": "#/refs/signal"
}
]
},
"values": {
"oneOf": [
{
"type": "array"
},
{
"$ref": "#/refs/signal"
}
]
},
"encode": {
"type": "object",
"properties": {
"title": {
"$ref": "#/defs/guideEncode"
},
"labels": {
"$ref": "#/defs/guideEncode"
},
"legend": {
"$ref": "#/defs/guideEncode"
},
"symbols": {
"$ref": "#/defs/guideEncode"
},
"gradient": {
"$ref": "#/defs/guideEncode"
}
},
"additionalProperties": false
}
},
"additionalProperties": false,
"anyOf": [
{
"required": [
"size"
]
},
{
"required": [
"shape"
]
},
{
"required": [
"fill"
]
},
{
"required": [
"stroke"
]
},
{
"required": [
"opacity"
]
}
]
},
"mark": {
"type": "object",
"properties": {
"type": {
"$ref": "#/refs/marktype"
},
"name": {
"type": "string"
},
"key": {
"type": "string"
},
"interactive": {
"type": "boolean"
},
"encode": {
"$ref": "#/defs/encode"
},
"transform": {
"type": "array",
"items": {
"$ref": "#/defs/transformMark"
}
},
"on": {
"$ref": "#/defs/onMarkTrigger"
}
},
"required": [
"type"
]
},
"markGroup": {
"allOf": [
{
"properties": {
"type": {
"enum": [
"group"
]
}
},
"required": [
"type"
]
},
{
"$ref": "#/defs/mark"
},
{
"$ref": "#/defs/scope"
},
{
"type": "object",
"properties": {
"from": {
"oneOf": [
{
"$ref": "#/refs/from"
},
{
"$ref": "#/refs/facet"
}
]
}
}
}
]
},
"markVisual": {
"allOf": [
{
"not": {
"properties": {
"type": {
"enum": [
"group"
]
}
}
}
},
{
"$ref": "#/defs/mark"
},
{
"type": "object",
"properties": {
"from": {
"$ref": "#/refs/from"
}
}
}
]
},
"onEvents": {
"type": "array",
"items": {
"allOf": [
{
"type": "object",
"properties": {
"events": {
"oneOf": [
{
"$ref": "#/refs/selector"
},
{
"$ref": "#/refs/signal"
},
{
"$ref": "#/defs/stream"
},
{
"type": "array",
"items": {
"$ref": "#/defs/stream"
}
}
]
},
"force": {
"type": "boolean"
}
},
"required": [
"events"
]
},
{
"oneOf": [
{
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e=t.modified()||n.changed(n.ADD_REM)||L(t.text)&&n.modified(t.text.fields)||L(t.font)&&n.modified(t.font.fields)||L(t.rotate)&&n.modified(t.rotate.fields)||L(t.fontSize)&&n.modified(t.fontSize.fields)||L(t.fontStyle)&&n.modified(t.fontStyle.fields)||L(t.fontWeight)&&n.modified(t.fontWeight.fields);if(e){var r,i,a,o,u=this.value,s=t.as||vC,l=t.fontSize||14;L(l)?r=t.fontSizeRange:l=U(l),r&&(i=l,a=Ba("sqrt")().domain(Hc(i,n)).range(r),l=function(t){return a(i(t))});var f=n.materialize(n.SOURCE).source;f.forEach(function(t){t[s[0]]=NaN,t[s[1]]=NaN,t[s[3]]=0}),o=u.words(f).text(t.text).size(t.size||[500,500]).padding(t.padding||1).spiral(t.spiral||"archimedean").rotate(t.rotate||0).font(t.font||"sans-serif").fontStyle(t.fontStyle||"normal").fontWeight(t.fontWeight||"normal").fontSize(l).layout();for(var c,h,d=u.size(),p=d[0]>>1,g=d[1]>>1,m=0,v=o.length;v>m;++m)c=o[m],h=c.datum,h[s[0]]=c.x+p,h[s[1]]=c.y+g,h[s[2]]=c.font,h[s[3]]=c.size,h[s[4]]=c.style,h[s[5]]=c.weight,h[s[6]]=c.rotate;return 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t<this.x1&&(this.x1=t),n<this.y1&&(this.y1=n),t>this.x2&&(this.x2=t),n>this.y2&&(this.y2=n),this},kC.expand=function(t){return this.x1-=t,this.y1-=t,this.x2+=t,this.y2+=t,this},kC.round=function(){return this.x1=Math.floor(this.x1),this.y1=Math.floor(this.y1),this.x2=Math.ceil(this.x2),this.y2=Math.ceil(this.y2),this},kC.translate=function(t,n){return this.x1+=t,this.x2+=t,this.y1+=n,this.y2+=n,this},kC.rotate=function(t,n,e){var r=Math.cos(t),i=Math.sin(t),a=n-n*r+e*i,o=e-n*i-e*r,u=this.x1,s=this.x2,l=this.y1,f=this.y2;
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"+t),this.addData(t,k_.fromEntries(this,n))},t.load=vt,t.Dataflow=Be,t.EventStream=ve,t.Parameters=ce,t.Pulse=Ee,t.MultiPulse=Pe,t.Operator=de,t.Transform=Ye,t.changeset=fe,t.ingest=ae,t.register=Xe,t.definition=Ge,t.definitions=Gb,t.transform=Je,t.transforms=Xb,t.tupleid=re,t.scale=Ba,t.scheme=$a,t.projection=Yu,t.View=jm,t.parse=cx,t.runtime=Nm,t.runtimeContext=zm,t.bin=n,t.bootstrapCI=_,t.randomInteger=x,t.randomNormal=b,t.randomUniform=w,t.quartiles=M,t.accessor=k,t.accessorName=E,t.accessorFields=S,t.id=xx,t.identity=bx,t.zero=wx,t.one=Mx,t.truthy=kx,t.falsy=Ex,t.logger=R,t.None=Sx,t.Warn=Cx,t.Info=Ax,t.Debug=Tx,t.array=P,t.compare=q,t.constant=U,t.error=F,t.extend=j,t.extentIndex=I,t.field=D,t.inherits=$,t.isArray=yx,t.isFunction=L,t.isNumber=W,t.isObject=T,t.isString=N,t.key=B,t.merge=H,t.pad=X,t.peek=G,t.repeat=Y,t.splitAccessPath=C,t.stringValue=z,t.toSet=J,t.truncate=V,t.visitArray=Z,Object.defineProperty(t,"__esModule",{value:!0})});
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