d3帶縮放和放大縮小的js

使用下面的d3 js代碼繪製縮放比例，但無法弄清楚如何在縮放時將x軸日期轉換爲小時，嘗試實現x軸日期轉換爲小時放大並再次縮小日期。d3帶縮放和放大縮小的js

<!DOCTYPE html> 
<meta charset="utf-8"> 
<style> /* set the CSS */ 

body { font: 12px Arial;} 

path { 
    stroke: steelblue; 
    stroke-width: 2; 
    fill: none; 
} 

.axis path, 
.axis line { 
    fill: none; 
    stroke: grey; 
    stroke-width: 1; 
    shape-rendering: crispEdges; 
} 

</style> 
<body> 

<!-- load the d3.js library -->  
<script src="http://d3js.org/d3.v3.min.js"></script> 

<script> 

// Set the dimensions of the canvas/graph 
var margin = {top: 30, right: 20, bottom: 30, left: 50}, 
    width = 600 - margin.left - margin.right, 
    height = 270 - margin.top - margin.bottom; 

// Parse the date/time 
var parseDate = d3.time.format("%d-%b-%y").parse; 

// Set the ranges 
var x = d3.time.scale().range([0, width]); 
var y = d3.scale.linear().range([height, 0]); 

// Define the axes 
var xAxis = d3.svg.axis().scale(x) 
    .orient("bottom").ticks(5); 

var yAxis = d3.svg.axis().scale(y) 
    .orient("left").ticks(5); 

// Define the line 
var valueline = d3.svg.line() 
    .x(function(d) { return x(d.date); }) 
    .y(function(d) { return y(d.close); }); 

// Adds the svg canvas 
var svg = d3.select("body") 
    .append("svg") 
     .attr("width", width + margin.left + margin.right) 
     .attr("height", height + margin.top + margin.bottom) 
    .append("g") 
    .attr("transform","translate(" + margin.left + "," + margin.top + ")") 
    .call(d3.behavior.zoom().on("zoom", function() { 
    svg.attr("transform", "translate(" + d3.event.translate + ")" + " scale(" + d3.event.scale + ")") 
    })) 
    .append("g"); 



// Get the data 
d3.csv("data.csv", function(error, data) { 

    data = [{ 
       date:"1-May-12", 
       close:"58.13" 
      }, 
      { 
       date:"30-Apr-12", 
       close:"53.98" 
      },{ 
       date:"27-Apr-12", 
       close:"67.00" 
      },{ 
       date:"26-Apr-12", 
       close:"89.70" 
      } 
      ] 

    data.forEach(function(d) { 
     d.date = parseDate(d.date); 
     d.close = +d.close; 
    }); 

    // Scale the range of the data 
    x.domain(d3.extent(data, function(d) { return d.date; })); 
    y.domain([0, d3.max(data, function(d) { return d.close; })]); 

    // Add the valueline path. 
    svg.append("path") 
     .attr("class", "line") 
     .attr("d", valueline(data)); 

    // Add the X Axis 
    svg.append("g") 
     .attr("class", "x axis") 
     .attr("transform", "translate(0," + height + ")") 
     .call(xAxis); 

    // Add the Y Axis 


}); 

</script> 
</body>

來源

2017-07-03 prakashkadakol

不完全理解你的問題。你看過[Brush＆Zoom]（https://bl.ocks.org/mbostock/34f08d5e11952a80609169b7917d4172）例子嗎？ –

在實現縮放事件的回調中。您只能轉換svg對象。你也必須處理軸。看起來你有軸縮放的效果。

xScale = d3.event.transform.rescaleX(xScale) 
gX.call(xAxis.scale(xScale))

它根據縮放事件重縮放縮放器，並且軸重新縮放並應用於軸組容器。

來源

2017-11-08 16:29:46

d3帶縮放和放大縮小的js

回答

相關問題