Question

我的数据是(date, start, stop)个元组的数组，其中start和stop是当天[0, 1440]的分钟数，因此凌晨1点表示为60.我想绘制矩形，其中每个矩形水平对齐日期，高度是开始和停止时间。这就是我所拥有的，这是接近但有一些错误（错误是我的问题）：

this is what I get, which is close to what I want

我希望我的矩形与日期栏一样宽，但这并不是我所看到的。特别是，我对x_scale.rangeBand()的呼吁给了我比列更广泛的东西。（注意水平重叠。）- .5 * x_scale.rangeBand())意味着将矩形居中。
我想在y轴上指出时间而不是分钟，但是对Ticks()和TickValues()的评论调用完全没有。

指针非常感谢。

这是生成此代码的代码：

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <title>D3 Page Template</title>
    <script type="text/javascript" src="d3.js"></script>
    <style>
    .d3-canvas { background-color: #F1EEFF; }
    .icongray { fill: #5B5852; }
    .axis path,
    .axis line {
        fill: none;
        stroke: black;
        shape-rendering: crispEdges;
    }
    </style>
</head>
<body>
    <script type="text/javascript">
     var data = [{"date": new Date("2015-01-01"), "start": 0, "end": 60},
         {"date": new Date("2015-01-02"), "start": 720, "end": 780},
         {"date": new Date("2015-01-03"), "start": 1300, "end": 1440}]

     var do_the_plot = function(width, height) {
         margin = {"left": 45, "right": 25, "top": 25, "bottom": 25};
         image_width = width - margin.left - margin.right;
         image_height = height - margin.top - margin.bottom;
         svg = setup_svg(width, height);
         draw_it(svg);
     }

     log_int = function(label, the_int) {
         console.log(label, the_int);
         return the_int;
     }

     minutes_in_day = 1440;

     // Set up an svg element for us.  Return it.
     setup_svg = function(width, height) {
     num_days = 3
     canvas = d3.select("body")
            .append("svg")
            .attr({"width": width,
               "height": height,
               "class": "d3-canvas",
            });
     inside = canvas.append("g")
            .attr({"transform": "translate(" + margin.left + "," + margin.top + ")"
            })
         return inside;
     }

     // Draw some rectangles representing reading sessions.
     draw_it = function(svg, reading_sessions) {
     // Assume data is a list of {day, start, stop}, day an int
     // (zero-based, days since start), start and stop minutes (int).
     x_scale = d3.scale.ordinal()
         //.domain([0, num_days])
             .domain([new Date("2015-01-01"), new Date("2015-01-03")]) // Use from data.
             .rangeRoundBands([0, image_width]);
     y_scale = d3.scale.linear()
             .domain([0, minutes_in_day])
             .range([image_height, 0]);
     h_scale = d3.scale.linear()
             .domain([0, minutes_in_day])
             .range([0, image_height]);
     console.log("about to rect");
     svg.selectAll("rect")
        .data(data)
        .enter()
        .append("rect")
        .attr({
            "width": function(d) { return log_int("w", x_scale.rangeBand()); },
            "height": function(d) { return log_int("h", h_scale(d.end - d.start)); },
            "x": function(d) { return log_int("x", x_scale(d.date) - .5 * x_scale.rangeBand()); },
            "y": function(d) { return log_int("y", y_scale(d.end)); },
            "class": "icongray"
        });
     console.log("got rects");
     var x_axis = d3.svg.axis()
            .scale(x_scale)
            .orient("bottom")
            .tickFormat(d3.time.format("%d-%m"));
     svg.append("g")
        .attr({"class": "axis",
           "transform": "translate(0, " + image_height + ")",
        })
        .call(x_axis);
     var y_axis = d3.svg.axis()
            .scale(y_scale)
         //.ticks([0, 180, 360, 540, 720, 900, 1080, 1260, 1440])
         //.tickValues(["midnight", "3:00", "6:00", "9:00", "noon", "15:00", "18:00", "21:00", "midnight"])
            .orient("left");
     svg.append("g")
        .attr({"class": "axis"})
        .call(y_axis);
     }

     do_the_plot(300, 300);
    </script>
</body>
</html>

Answer 1

我希望我的矩形与日期列一样宽 ....问题是因为你给了域，好像它是范围一样。域将具有所有值。您在x轴上的代码：

.domain([new Date("2015-01-01"), new Date("2015-01-03")]) 
// should have been this.. it will give an array of all dates in data
.domain(data.map(function (d) {return d.date;}))

我想在y轴上指出时间而不是分钟 ....刻度值无助于刻度格式会有所帮助。所以在Y轴上做：

      //y tick values
        var y_values = [0, 180, 360, 540, 720, 900, 1080, 1260, 1440]
        //y tick display for its corresponding values 
        var y_display = ["midnight", "3:00", "6:00", "9:00", "noon", "15:00", "18:00", "21:00", "midnight"]

        .tickValues(y_values)
        .tickFormat(function (d) {
            var index = y_values.indexOf(d)
            return y_display[index];
        })

此处完整更正的代码：http://jsfiddle.net/cyril123/q4zy96zu/1/

D3轴：对齐日期（x），显示时间（y）

1 个答案: