html 使用D3在Scatterplot中演示缩放和平移

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<!DOCTYPE html>
<html>

<head>
    <title></title>
</head>

<body>
    <!-- load the d3.js library -->
    <script src="https://d3js.org/d3.v4.min.js"></script>
    <script>

    // set the dimensions and margins of the graph
    var margin = { top: 20, right: 20, bottom: 30, left: 50 },
        width = 960 - margin.left - margin.right,
        height = 500 - margin.top - margin.bottom;

    // append the svg obgect to the body of the page
    // appends a 'group' element to 'svg'
    // moves the 'group' element to the top left margin
    var svg = d3.select("body")
    	.append("svg")
        .attr("width", width + margin.left + margin.right)
        .attr("height", height + margin.top + margin.bottom);

    svg.append("defs").append("clipPath")
    	.attr("id", "clip")
  		.append("rect")
    	.attr("width", width)
    	.attr("height", height);

    // set the ranges
    var x = d3.scaleLinear().range([0, width]);
    var y = d3.scaleLinear().range([height, 0]);

    // scale the range of the data
    x.domain([-50, 50]);
    y.domain([-50, 50]);

    var xAxis = d3.axisBottom(x);
    var yAxis = d3.axisLeft(y);

    // add the X Axis
    var gX = svg.append("g")
        .attr("transform", "translate(" + margin.left + ", " + (margin.top + height) + ")")
        .call(xAxis);

    // add the Y Axis
    var gY = svg.append("g")
    	.attr("transform", "translate(" + margin.left + ", " + margin.top + ")")
        .call(yAxis);

    // Zoom functionality
    var zoom = d3.zoom()
	    .scaleExtent([.5, 20])
	    .extent([[0, 0], [width, height]])
	    .on("zoom", zoomed);

    var event_rect = svg.append("rect")
    	.attr("width", width)
    	.attr("height", height)
    	.style("fill", "none")
    	.style("pointer-events", "all")
    	.attr('transform', 'translate(' + margin.left + ',' + margin.top + ')')
    	.call(zoom);

    var points_g = svg.append("g")
        .attr('transform', 'translate(' + margin.left + ',' + margin.top + ')')
  		.attr("clip-path", "url(#clip)");
  		// .classed("points_g", true);

    var getdata = function() {
        var dataset = []
        for (var i = 0; i < 20; i++) {
            var x = d3.randomUniform(-50, 50)();
            var y = d3.randomUniform(-50, 50)();
            dataset.push({ "x": x, "y": y });
        }
        return dataset;
    }

    // Get the data
    var data = getdata()

    // format the data
    data.forEach(function(d) {
        d.x = +d.x;
        d.y = +d.y;
    });

    // add the dots
    var points = points_g.selectAll("circle")
        .data(data)
        .enter()
        .append("circle")
        .attr("r", 5)
        .attr("cx", function(d) { return x(d.x); })
        .attr("cy", function(d) { return y(d.y); })
        .on('click', function(d, i) {
        	
        })
        .on('mouseover', function(d, i) {
        	console.log("Mouse over");
        });
    

    function zoomed() {
	    var new_x = d3.event.transform.rescaleX(x);
	    var new_y = d3.event.transform.rescaleY(y);
		// update axes
	    gX.call(xAxis.scale(new_x));
	    gY.call(yAxis.scale(new_y));
	    points.data(data)
	    	.attr('cx', function(d) {return new_x(d.x)})
	     	.attr('cy', function(d) {return new_y(d.y)});
	}


    </script>
</body>

</html>

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