Question

我有一个当前的缩放功能，我刚学会在D3中使用。但是当我使用它时，它只会移动我并缩放图形的轴而不是它上面的对象。

我非常了解D3并希望得到一些帮助。

我的javascript源代码发布如下：

    //Setting generic width and height values for our SVG.
    var margin = {top: 60, right: 0, bottom: 60, left: 40},
        width = 1024 - 70 - margin.left - margin.right,
        height = 668 - margin.top - margin.bottom;

     //Other variable declarations.


    //Creating scales used to scale everything to the size of the SVG.
    var xScale = d3.scale.linear()
        .domain([0, 1024])
        .range([0, width]);

    var yScale = d3.scale.linear()
        .domain([1, 768])
        .range([height, 0]);

    //Creates an xAxis variable that can be used in our SVG.
    var xAxis = d3.svg.axis()
        .scale(xScale)
        .orient("bottom");

    var yAxis = d3.svg.axis()
        .scale(yScale)
        .orient("left");

    //Zoom command ...
    var zoom = d3.behavior.zoom()
        .x(xScale)
        .y(yScale)
        .scaleExtent([1, 10])
        .on("zoom", zoomed);


    // The mark '#' indicates an ID. IF '#' isn't included argument expected is a tag such as "svg" or "p" etc..
    var SVG = d3.select("#mainSVG")
                .attr("width", width + margin.left + margin.right)
                .attr("height", height + margin.top + margin.bottom)
                .append("g")
                .attr("transform", "translate(" + margin.left + "," + margin.top + ")")
                .call(zoom);


    //Create background. The mouse must be over an object on the graph for the zoom to work. The rectangle will cover the entire graph.
    var rect = SVG.append("rect")
        .attr("width", width)
        .attr("height", height);

    //This selects 4 circles (non-existent, there requires data-binding) and appends them all below enter.
    //The amount of numbers in data is the amount of circles to be appended in the enter() section. 
    var circle = SVG
        .selectAll("circle")
        .data([40,100,400,1900])
        .enter()
            .append("circle")
            .attr("cx",function(d){return xScale(d)})
            .attr("cy",function(d){return xScale(d)})
            .attr("r",20);

    //This appends a circles to our SVG.
    var circle = SVG
        .append("circle")
        .attr("cx",function(d){ return xScale(d)})
        .attr("cy",300)
        .attr("r",20);



    //Showing the axis that we created earlier in the script for both X and Y.
    var xAxisGroup = SVG.append("g")
        .attr("class", "x axis")
        .attr("transform", "translate(0," + height + ")")
        .call(xAxis);

    var yAxisGroup = SVG.append("g")
        .attr("class", "y axis")
        .call(yAxis);

    function zoomed() {
       SVG.select(".x.axis").call(xAxis);
       SVG.select(".y.axis").call(yAxis);
    }

Answer 1

您还需要在缩放时使用更改的轴重绘所有元素 - D3不会自动为您执行此操作：

function zoomed() {
   SVG.select(".x.axis").call(xAxis);
   SVG.select(".y.axis").call(yAxis);

   SVG.selectAll("circle")
      .attr("cx",function(d){return xScale(d)})
      .attr("cy",function(d){return xScale(d)});
}

缩放仅缩放我的轴而不是我图表上的对象

1 个答案: