[英]How do I prevent graph elements from reaching the axis of my graph in D3 and scale properly?
I have currently have a quick test for a graph I'm about to create for website and I have made the most basic functionality. 我目前正在为要为网站创建的图形进行快速测试,并且已经完成了最基本的功能。 I have a graph, a 4 elements and an x and ay axis and a zoom functionality.
我有一个图形,一个4个元素以及一个x和y轴以及一个缩放功能。
My problem lies in the fact that when I zoom on the graph, the elements are able to reach the axis and overlap it. 我的问题在于,当我放大图形时,元素能够到达轴并重叠。 I've pasted my source code below
我在下面粘贴了我的源代码
//Setting generic width and height values for our SVG.
var margin = {top: 60, right: 0, bottom: 60, left: 40},
width = 1024 - 70 - margin.left - margin.right,
height = 668 - margin.top - margin.bottom;
//Other variable declarations.
//Creating scales used to scale everything to the size of the SVG.
var xScale = d3.scale.linear()
.domain([0, 1024])
.range([0, width]);
var yScale = d3.scale.linear()
.domain([1, 768])
.range([height, 0]);
//Creates an xAxis variable that can be used in our SVG.
var xAxis = d3.svg.axis()
.scale(xScale)
.orient("bottom");
var yAxis = d3.svg.axis()
.scale(yScale)
.orient("left");
//Zoom command ...
var zoom = d3.behavior.zoom()
.x(xScale)
.y(yScale)
.scaleExtent([1, 10])
.on("zoom", zoomTargets);
// The mark '#' indicates an ID. IF '#' isn't included argument expected is a tag such as "svg" or "p" etc..
var SVG = d3.select("#mainSVG")
.attr("width", width + margin.left + margin.right)
.attr("height", height + margin.top + margin.bottom)
.append("g")
.attr("transform", "translate(" + margin.left + "," + margin.top + ")")
.call(zoom);
//Create background. The mouse must be over an object on the graph for the zoom to work. The rectangle will cover the entire graph.
var rect = SVG.append("rect")
.attr("width", width)
.attr("height", height);
//Showing the axis that we created earlier in the script for both X and Y.
var xAxisGroup = SVG.append("g")
.attr("class", "x axis")
.attr("transform", "translate(0," + height + ")")
.call(xAxis);
var yAxisGroup = SVG.append("g")
.attr("class", "y axis")
.call(yAxis);
//This selects 4 circles (non-existent, there requires data-binding) and appends them all below enter.
//The amount of numbers in data is the amount of circles to be appended in the enter() section.
var circle = SVG
.selectAll("circle")
.data([40,100,400,1900])
.enter()
.append("circle")
.attr("cx",function(d){return xScale(d)})
.attr("cy",function(d){return yScale(d)})
.attr("r",20);
//Resets zoom when click on circle object. Zoom work now, should be changed to a button instead of click on circle though.
SVG.selectAll("circle").on("click", function() {
zoom.scale(1);
zoom.translate([0,0]);
zoomTargets();
});
function zoomTargets() {
SVG.select(".x.axis").call(xAxis);
SVG.select(".y.axis").call(yAxis);
SVG.selectAll("circle").attr("cx",function(d){return xScale(d)}).attr("cy",function(d){return yScale(d)});
}
function resetZoom() {
zoom.scale(1);
zoom.translate([0,0]);
zoomTargets();
}
I've tried using "append("g2") before creating a circle to I can make g2 smaller than the entire svg, but that doesn't seem to work. As far as I have understood, you can just append a new element inside your existing one. I'm guessing I'm wrong since it hasn't worked for me. 我已经尝试过使用“ append(” g2“)创建一个圆圈,然后才能使g2小于整个svg,但似乎不起作用。据我所知,您可以追加一个新元素在您现有的计算机内部,我想我错了,因为它对我没有用。
Thank you in advance for your help. 预先感谢您的帮助。
Leave a small gap between the most extreme data point and the axis. 在最极端的数据点和轴之间留一个小间隙。 In particular, you may want the range of your domain to take the margins into account:
特别是,您可能希望域的范围考虑到边距:
var xScale = d3.scale.linear()
.domain([0, 1024])
.range([0, width-margin.right]);
var yScale = d3.scale.linear()
.domain([1, 768])
.range([height, margin.bottom]);
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