Javascript 如何确定D3等高线的大小
我想调整轮廓的大小，使其填充到其封闭容器的大小。似乎是说我需要给SVG一个viewBox，以便它知道如何正确显示轮廓。如果这是适当的操作过程，如何更改其他元素（如轴），使它们保持适当的大小 我当前的尝试如下所示，它以阈值0从50x50阵列创建轮廓 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var data_width=数据[0]。长度； var data_height=data.length； var-margin={顶部：20，右侧：20，底部：40，左侧：40}； 变量高度=300-margin.top-margin.bottom； 变量宽度=300-margin.left-margin.right； 常量假设=[].concat.apply[]，数据； var xScale=d3.scaleLinear .domain[0，1000] .范围[0，宽度]； var xAxis=d3.axisBottomxScale.ticks10； var yScale=d3.scaleLinear .domain[0，1000] .范围[高度，0]； var yAxis=d3.axisLeftyScale.ticks10； var svg=d3。选择“容器” .append'svg' //.attrviewBox，[0,0,50,50]这不会给出我的预期行为 .宽度，300 .身高300 var chartArea=svg.append'g' .attr'id'，'chart-area' .attr'transform'，'translate${margin.left}，${margin.top}`； svg.选择“图表区域” .附加“g” .attr'class'，'x轴' .attr'transform'，'translate0，${height}` .callxAxis； svg.选择“图表区域” .附加“g” .attr'class'，'y轴' .callyAxis； const path=d3.geoPath； 等高线常数=d3等高线尺寸[50,50] .阈值[0]； var g=图表区域。附录g .黑色 .笔划宽度，0.5 .attrfill，无； g、 selectAllnull .数据流假设 进来 .appendpath .attrd，路径； d3.contours没有设置轮廓大小的方法：矩阵的宽度和高度对应于轮廓生成器创建的位置 您当前正在将这些位置传递到d3.geoPath，而d3.geoPath也没有设置生成路径大小的方法。您可以将自定义投影传递到d3.geoPath，然后使用projection.fitSize或projection.fitExtent以您想要的方式拉伸路径，但对我来说，这似乎需要做很多工作 一个简单的替代方法是删除d3.geoPath并使用带刻度的线生成器。在刻度中，您使用矩阵的宽度/高度，因为在您的情况下，它们是相同的，我们将仅使用一个刻度作为域，并根据需要设置您的范围：Javascript 如何确定D3等高线的大小,javascript,d3.js,svg,Javascript,D3.js,Svg,我想调整轮廓的大小，使其填充到其封闭容器的大小。似乎是说我需要给SVG一个viewBox，以便它知道如何正确显示轮廓。如果这是适当的操作过程，如何更改其他元素（如轴），使它们保持适当的大小 我当前的尝试如下所示，它以阈值0从50x50阵列创建轮廓 数据=[[-69.776,-70.206,-70.503,-70.68,-70.75,-70.724,-70.613,-70.427,-70.174,-69.863,-69.501,-69.095,-68.652,-68.178,-67.676,-6
const scale = d3.scaleLinear()
.domain([0, 50])
.range([0, 200]);
const line = d3.line()
.x(d=>scale(d[0]))
.y(d=>scale(d[1]));
我通常不会添加第二个答案，我通常会编辑第一个答案，但这是一种特殊情况：在中，我说过添加自定义投影将是一项艰巨的工作……好吧，我的观点是正确的：使用投影实际上比我建议的d3.line解决方案简单得多 以下是您所需的全部信息—根据您的需要设置fitSize阵列：
const projection = d3.geoIdentity()
.fitSize([200,200], contours(hypothesis)[0])
如果没有的话，我可能会添加这个答案，毕竟它是geojson，还不如使用身份投影。嗨，非常感谢你这么好的回答。在玩了一会儿之后，我注意到geoPath方法似乎不适合宽度和高度。你可以看到，它只填充高度。@D.Cohen这是预期的行为，对吗这正是fitSize所做的。它不会使图像比例（宽度x高度）变形。当我使用此方法时，它确实可以适当缩放，但无法显示多个轮廓。我将新数据放入其中，其中应显示两个轮廓，但仅显示一个轮廓。再次感谢您的帮助！@D.Cohen我解释说，您没有设置阈值这已经出现在您的第一个问题中。下面是对阈值的处理：对不起，我应该更清楚。在使用geoPath的示例中，您可以看到有两条等高线适合0处的单个阈值：。
const projection = d3.geoIdentity()
.fitSize([200,200], contours(hypothesis)[0])
const path = d3.geoPath()
.projection(projection);