[英]D3 Y Scale, y vs height?
I'm learning D3, and I can see that I get the same visualization with these two things: 我正在学习D3,并且可以看到我在这两件事上得到了相同的可视化效果:
var w = 600; var h = 100; var dataset = [1, 6, 3, 4, 10, 4, 9] var svg = d3.select("body").append("svg") .attr("height", h) .attr("width", w) var xScale = d3.scale.linear() .domain([0, dataset.length]) .range([0, w]);
Using the height attribute: 使用height属性:
var yScale = d3.scale.linear() .domain([0, d3.max(dataset)]) .range([h, 0]); svg.selectAll("rect") .data(dataset) .enter() .append("rect") .attr({ x: function(d, i) { return xScale(i); }, y: function(d) { return yScale(d); }, width: w / dataset.length, height: function(d) { return h - yScale(d); }, fill: "teal" });
Or setting y: 或设置y:
var yScale = d3.scale.linear() .domain([0, d3.max(dataset)]) .range([0, h]); svg.selectAll("rect") .data(dataset) .enter() .append("rect") .attr({ x: function(d, i) { return xScale(i); }, y: function(d) { return h - yScale(d); }, width: w / dataset.length, height: function(d) { return yScale(d); }, fill: "teal" });
Is either one more correct, if so, why? 是否更正确?如果是,为什么?
Now that I got to a later chapter, it seems like former option, which uses range([h, 0])
is better when creating a yAxis. 现在,我进入了下一章,似乎是前一个选项,它在创建yAxis时使用range([h, 0])
更好。 If I use the latter option range([0, h])
, the graph comes out as follows (with no transforms of the yAxis call: 如果我使用后一个选项range([0, h])
,则图形如下所示(不对yAxis调用进行任何转换:
Which generally is not what one would want. 通常这不是人们想要的。
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