Javascript 绘制线使用相同的y值,在底部绘制线
我也有同样的问题 在Javascript 绘制线使用相同的y值,在底部绘制线,javascript,d3.js,Javascript,D3.js,我也有同样的问题 在yAxis中使用相同的值时,将在底部打印行 这是我的代码: var data = [ { creat_time: "2013-03-19 10:28:30", roundTripTime: "32" }, { creat_time: "2013-03-19 09:07:12", roundTripTime: "45" }, { creat_time: "2013-03-19 08:57:09", roundT
yAxis
中使用相同的值时,将在底部打印行
这是我的代码:
var data = [
{
creat_time: "2013-03-19 10:28:30",
roundTripTime: "32"
},
{
creat_time: "2013-03-19 09:07:12",
roundTripTime: "45"
},
{
creat_time: "2013-03-19 08:57:09",
roundTripTime: "26"
},
{
creat_time: "2013-03-19 08:47:10",
roundTripTime: "90"
},
{
creat_time: "2013-03-19 08:37:12",
roundTripTime: "80"
},
{
creat_time: "2013-03-19 08:27:08",
roundTripTime: "36"
}
];
var data1 = [
{
creat_time: "2013-03-19 10:28:30",
roundTripTime: "100"
},
{
creat_time: "2013-03-19 09:07:12",
roundTripTime: "100"
},
{
creat_time: "2013-03-19 08:57:09",
roundTripTime: "100"
},
{
creat_time: "2013-03-19 08:47:10",
roundTripTime: "100"
},
{
creat_time: "2013-03-19 08:37:12",
roundTripTime: "100"
},
{
creat_time: "2013-03-19 08:27:08",
roundTripTime: "100"
}
];
function draw(data) {
var margin = {
top: 20,
right: 20,
bottom: 30,
left: 50
};
var width = 960 - margin.left - margin.right;
var height = 500 - margin.top - margin.bottom;
var parseDate = d3.time.format("%Y-%m-%d %H:%M:%S").parse;
var x = d3.time.scale().range([0, width]);
var y = d3.scale.linear().range([height, 0]);
var xAxis = d3.svg
.axis()
.scale(x)
.orient("bottom")
.tickFormat(d3.time.format("%H:%M"));
var yAxis = d3.svg
.axis()
.scale(y)
.orient("left");
var line = d3.svg
.line()
.x(function(d) {
return x(d.creat_time);
})
.y(function(d) {
return y(d.roundTripTime);
});
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 + ")");
data.forEach(function(d) {
d.creat_time = parseDate(d.creat_time);
d.roundTripTime = +d.roundTripTime;
});
data = sortByReturnTime(data);
x.domain(
d3.extent(data, function(d) {
return d.creat_time;
})
);
y.domain(
d3.extent(data, function(d) {
return d.roundTripTime;
})
);
svg
.append("g")
.attr("class", "x axis")
.attr("transform", "translate(0," + height + ")")
.call(xAxis);
svg
.append("g")
.attr("class", "y axis")
.call(yAxis);
svg
.append("path")
.datum(data)
.attr("class", "line")
.attr("d", line);
}
draw(data);
调用draw(数据)时
draw(data)
没错
SVG是:
并调用draw(data1)//y值相同
draw(data1) //the y values is the same
在SVG中,打印行位于底部,但如果没有错误,则应位于顶部
SVG是:
知道这里出了什么问题吗?我能做些什么使绘图线在顶部?
非常感谢您的帮助。问题是您正在使用
d3.extent
设置范围的输入域。如果所有值都相同,则所有内容都将映射到0 y坐标。要将y比例从0开始,请替换
y.domain(d3.extent(data, function (d) {
return d.roundTripTime;
}));
与
您是否尝试过将数字作为实际数字放入JSON中(即删除其周围的引号)?是的。通过表达式“d.roundTripTime=+d.roundTripTime;它被转换为数字。
y.domain([0, d3.max(data, function (d) {
return d.roundTripTime;
})]);