node实现D3数据交互与使用
treemap.js
<script src="d3/d3.min.js">script>
<script>
$(function() {
var svg = d3.select("svg"),
width = +svg.attr("width"),
height = +svg.attr("height");
var fader = function(color) {
return d3.interpolateRgb(color, "#fff")(0.2);
},
color = d3.scaleOrdinal(d3.schemeCategory20.map(fader)),
format = d3.format(",d");
var treemap = d3.treemap()
.tile(d3.treemapResquarify)
.size([width, height])
.round(true)
.paddingInner(1);
var url = "http://localhost:8282/treemap";
d3.json(url, function(error, data) {
if(error) throw error;
var root = d3.hierarchy(data)
.eachBefore(function(d) {
d.data.id = (d.parent ? d.parent.data.id + "." : "") + d.data.name;
})
.sum(sumBySize)
.sort(function(a, b) {
return b.height - a.height || b.value - a.value;
});
treemap(root);
var cell = svg.selectAll("g")
.data(root.leaves())
.enter().append("g")
.attr("transform", function(d) {
return "translate(" + d.x0 + "," + d.y0 + ")";
});
cell.append("rect")
.attr("id", function(d) {
return d.data.id;
})
.attr("width", function(d) {
return d.x1 - d.x0;
})
.attr("height", function(d) {
return d.y1 - d.y0;
})
.attr("fill", function(d) {
return color(d.parent.data.id);
});
cell.append("clipPath")
.attr("id", function(d) {
return "clip-" + d.data.id;
})
.append("use")
.attr("xlink:href", function(d) {
return "#" + d.data.id;
});
cell.append("text")
.attr("clip-path", function(d) {
return "url(#clip-" + d.data.id + ")";
})
.selectAll("tspan")
.data(function(d) {
return d.data.name.split(/(?=[A-Z][^A-Z])/g);
})
.enter().append("tspan")
.attr("x", 4)
.attr("y", function(d, i) {
return 13 + i * 10;
})
.text(function(d) {
return d;
});
cell.append("title")
.text(function(d) {
return d.data.id + "\n" + format(d.value);
});
d3.selectAll("input")
.data([sumBySize, sumByCount], function(d) {
return d ? d.name : this.value;
})
.on("change", changed);
var timeout = d3.timeout(function() {
d3.select("input[value=\"sumByCount\"]")
.property("checked", true)
.dispatch("change");
}, 2000);
function changed(sum) {
timeout.stop();
treemap(root.sum(sum));
cell.transition()
.duration(750)
.attr("transform", function(d) {
return "translate(" + d.x0 + "," + d.y0 + ")";
})
.select("rect")
.attr("width", function(d) {
return d.x1 - d.x0;
})
.attr("height", function(d) {
return d.y1 - d.y0;
});
}
});
function sumByCount(d) {
return d.children ? 0 : 1;
}
function sumBySize(d) {
return d.size;
}
});
script>
demo2.js
app.js
var express = require('express');
var path = require('path');
var favicon = require('serve-favicon');
var logger = require('morgan');
var cookieParser = require('cookie-parser');
var bodyParser = require('body-parser');
var Treemap = require('./routes/Treemap');
var demo2 = require('./routes/demo2');
var demo3 = require('./routes/demo3');
var ejs=require('ejs');
var app = express();
//本地请求跨域
app.all('*', function(req, res, next) {
res.header("Access-Control-Allow-Origin", "*");
res.header("Access-Control-Allow-Headers", "X-Requested-With");
res.header("Access-Control-Allow-Methods", "PUT,POST,GET,DELETE,OPTIONS");
res.header("X-Powered-By", ' 3.2.1')
res.header("Content-Type", "application/json;charset=utf-8");
next();
});
// view engine setup
app.engine("html",ejs.__express);
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'html');
// uncomment after placing your favicon in /public
//app.use(favicon(path.join(__dirname, 'public', 'favicon.ico')));
app.use(logger('dev'));
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));
//app.use('/', index);
//app.use('/users', users);
app.use('/treemap',Treemap);
app.use('/demo2',demo2);
app.use('/demo3',demo3);
// catch 404 and forward to error handler
app.use(function(req, res, next) {
var err = new Error('Not Found');
err.status = 404;
next(err);
});
// error handler
app.use(function(err, req, res, next) {
// set locals, only providing error in development
res.locals.message = err.message;
res.locals.error = req.app.get('env') === 'development' ? err : {};
// render the error page
res.status(err.status || 500);
res.render('error');
});
module.exports = app;
treemap.js
var express = require('express');
var router = express.Router();
/* GET home page. */
router.get('/', function(req, res, next) {
res.send(你要传的数据);
});
module.exports = router;democsv.js
var express = require('express');
var router = express.Router();
router.get('/', function(req, res, next) {
var fs = require("fs");
fs.readFile('../node/flare.csv', function(err, data) {
if(err) {
console.log(err.stack);
return;
} else {
var newdata = data.toString();
console.log(newdata);
res.send(newdata);
}
});
});
module.exports = router;