md`# Point Gauge`
viewof value = slider({min:0, max:50, step:0.1, title:"input value" })
config = {
return [
{id:"gauge1" , xtype:"pointgauge", x:70, y:60, min:0, max:50},
{id:"gauge2" , xtype:"pointgauge", x:210, y:60, min:0, max:80, repaint:0},
{id:"gauge3" , xtype:"pointgauge", x:350, y:60, min:30, max:70, repaint:0},
{id:"gauge4" , xtype:"pointgauge", x:490, y:60, min:0, max:100},
{id:"gauge5" , xtype:"pointgauge", x:630, y:60, min:0, max:100},
{id:"gauge6" , xtype:"pointgauge", x:770, y:60, min:0, max:100},
{id:"gauge7" , xtype:"pointgauge", x:910, y:60, min:0, max:100},
];
}
data = {
return [
{id:"gauge1" , value:value},
{id:"gauge2" , value:24+value},
{id:"gauge3" , value:60-value},
{id:"gauge4" , value:10+value},
{id:"gauge5" , value:0+value},
{id:"gauge6" , value:40-value},
{id:"gauge7" , value:40+value},
];
}
joined_data = {
let jdata = config.leftJoinWith( data , "id" ) ;
vzPanel.updateAll( jdata );
return jdata ;
}
shapeStore ={
let xtype = {}
xtype.pointgauge = pointgauge();
return xtype
}
pointgauge = conf => {
const gauge = {};
const _f1 = d3.format(".1f");
const _config = conf ? conf : {min:0, max:100, radius:40, segments:15, x:0, y:0} //default config
function translateAlong(path,from,to,f,scale) {
var l = to - from;
return function(d, i, a) {
return function(t) {
var x = from + t * l ;
var p = path.getPointAtLength( scale(x) );
if( typeof f === "function" ){
return f(x,p) ;
}
};
};
}
gauge.updateShape = function(node,config){
//console.log("update shape");
config = Object.assign({},_config,config);
d3.select(node).selectAll("*").remove();
gauge.render(node,config) ;
}
gauge.updateValue = function(node,value){
//console.log("update valuve:"+value);
let from = node.prevalue ? node.prevalue : 0, to = value;
node.prevalue = value ;
let g = d3.select(node);
// static text
//g.select("text.curvalue").text(_f1(value));
// guick move
//var position = node.pnode.getPointAtLength(node.scale(value)) ;
//g.select("circle.curpoint").attr("cx",position.x).attr("cy",position.y) ;
// animate
var curvalue = g.select("text.curvalue"), curpoint = g.select("circle.curpoint") ;
g
.transition()
.duration(2000)
.tween("text",translateAlong(node.pnode,from,to,function(x,p){
curvalue.text(_f1(x)) ;
curpoint.attr("cx",p.x).attr("cy",p.y) ;}, node.scale));
}
gauge.render = function(node,config){
//console.log("render:"+ node);
config = Object.assign({},_config,config);
let g=d3.select(node)
.attr("transform","translate("+[config.x,config.y]+")") ;
let path = d3.path();
let tpath = d3.path();
let startAngle=-Math.PI-1, endAngle=0+1
path.arc(0,0,config.radius,startAngle,endAngle);
tpath.arc(0,0,config.radius+15,startAngle,endAngle);
let p = g.append("path")
.attr("d", path.toString() )
.attr("stroke","#333")
.attr("stroke-width", 0)
.attr("fill","none");
node.pnode = p.node();
let t = g.append("path")
.attr("d", tpath.toString() )
.attr("stroke","#333")
.attr("stroke-width", 0)
.attr("fill","none");
node.tnode = t.node();
//def scale function
let segmentScale = d3.scaleLinear().domain([0, config.segments]).range([0, node.pnode.getTotalLength()]);
let txtScale = d3.scaleLinear().domain([0, config.segments]).range([0, node.tnode.getTotalLength()]);
let scale = d3.scaleLinear().domain([config.min, config.max]).range([0, node.pnode.getTotalLength()]);
node.scale =scale ;
//generate background points
let bkPoints = [] ;
let bkTxt = [];
for(let i=0 ; i<=config.segments; i++){
let len = segmentScale(i) ;
let point = node.pnode.getPointAtLength(len);
let v = scale.invert(len) ;
point.r = 3;
bkPoints.push( point ) ;
if( v === parseInt(v,10) ) {
point.r = 6;
let tpoint = node.tnode.getPointAtLength( txtScale(i) );
tpoint.y = tpoint.y + 3;
tpoint.text = v ;
bkTxt.push( tpoint );
}
}
g.selectAll(".bkpoint")
.data(bkPoints)
.enter()
.append("circle")
.attr("class","bkpoint")
.attr("cx", d=>{return d.x} )
.attr("cy", d=>{return d.y} )
.attr("r", d=>{return d.r} )
.attr("fill","#5c6d76");
g.selectAll(".bktxt")
.data(bkTxt)
.enter()
.append("text")
.attr("class","bktxt unselectable")
.attr("x", d=>{return d.x} )
.attr("y", d=>{return d.y} )
.attr("text-anchor", "middle")
.attr("fill","#5c6d76")
.style("font-size", "10px")
.text( d=>{return d.text} );
// current value and point
g.append("circle").attr("class","curpoint").attr("r",5).attr("fill","#ff9633");
g.append("text")
.attr("class","curvalue unselectable")
.attr("y",10)
.attr("text-anchor", "middle")
.attr("fill","#CCC")
.style("font-size", "28px");
gauge.updateValue(node, config.value) ;
}
return gauge;
}
One platform to build and deploy the best data apps
Experiment and prototype by building visualizations in live JavaScript notebooks. Collaborate with your team and decide which concepts to build out.
Use Observable Framework to build data apps locally. Use data loaders to build in any language or library, including Python, SQL, and R.
Seamlessly deploy to Observable. Test before you ship, use automatic deploy-on-commit, and ensure your projects are always up-to-date.