How do you center a <g> within a <svg> in D3.js? - javascript

I am trying to center a group that has a d3 tree inside of it. The svg is currently positioned perfectly across the browser and I am just trying to get the dynamically loaded tree to stay in the center of that svg element. All tree elements are within one group and have a zoom listener and have the ability to pan.
<svg width="1535" height="685" overflow-y="hidden" class="overlay">
<g transform="translate(742.5,342.5)scale(1)">
<g class="node" transform="translate(0,25)">
<circle class="nodeCircle" r="4.5" style="fill: rgb(255, 255, 255)</circle>
<text x="10" dy=".35em" class="nodeText" text-anchor="start" style="fill-opacity: 1;"></text>
<text x="10" dy="1.5em" class="nodeText" text-anchor="start"></text>
</g>
</g>
</svg>

i hope you understand the concept
first you draw svg with width: 1535 and hight :685
you want to make g element on middle of it
middle of it means half of width(1535/2) and half of height (685/2)
w:767.5 h:342.5
you draw g and transform it. good point but you must set transform to right place, that means on middle of svg to 742.5 and 342.5
so that means you need transform x,y) it more (25,0)
why you set it wrong
<g class="node" transform="translate(0,25)">
it must be
<g class="node" transform="translate(25,0)">
this is little example
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/4.2.3/d3.min.js"></script>
<script src="https://code.jquery.com/jquery-3.1.0.js"></script>
<!DOCTYPE html>
<meta charset="utf-8">
<style>
svg{
border-style: solid;
border-color: red;
}
}
</style>
<script src="https://d3js.org/d3.v4.min.js"></script>
<body>
<svg width="200" height="100" overflow-y="hidden" class="overlay">
<g transform="translate(70,20)scale(1)">
<g class="node" transform="translate(30,30)">
<circle class="nodeCircle" r="10" style="fill: black"</circle>
<text x="10" dy=".35em" class="nodeText" text-anchor="start" style="fill-opacity: 1;"></text>
<text x="10" dy="1.5em" class="nodeText" text-anchor="start"></text>
</g>
</g>
</svg>
<svg width="200" height="100" overflow-y="hidden" class="overlay">
<g transform="translate(100,50)scale(1)">
<g class="node" transform="translate(0,0)">
<circle class="nodeCircle" r="10" style="fill: black"</circle>
<text x="10" dy=".35em" class="nodeText" text-anchor="start" style="fill-opacity: 1;"></text>
<text x="10" dy="1.5em" class="nodeText" text-anchor="start"></text>
</g>
</g>
</svg>
<br/>
<svg width="200" height="100" overflow-y="hidden" class="overlay">
<g transform="translate(200,50)scale(1)">
<g class="node" transform="translate(0,0)">
<circle class="nodeCircle" r="10" style="fill: black"</circle>
<text x="10" dy=".35em" class="nodeText" text-anchor="start" style="fill-opacity: 1;"></text>
<text x="10" dy="1.5em" class="nodeText" text-anchor="start"></text>
</g>
</g>
</svg>
<svg width="200" height="100" overflow-y="hidden" class="overlay">
<g transform="translate(100,10)scale(1)">
<g class="node" transform="translate(100,40)">
<circle class="nodeCircle" r="10" style="fill: black"</circle>
<text x="10" dy=".35em" class="nodeText" text-anchor="start" style="fill-opacity: 1;"></text>
<text x="10" dy="1.5em" class="nodeText" text-anchor="start"></text>
</g>
</g>
</svg>
</body>

Related

SVG: Text show to have spacing at top and bottom

I am using a SVG to display a knock-out text template to create a rectangle that has text inside (that comes trough the mask). I want the mask text to match the given size and scale up properly, so that the text in charge does automatically is using the width and height it has for usage.
For longer paragraphs this work just fine but when the Text Content is not so long the logic scales up the text to its maximum width/height until it hits a border. See screenshot. But I do see that there is padding that I want to get rid of - how can I make the Text to fit the container fully?
To make it better visible I added a Text Element directly to the SVG so I can show the sizes of the Element. How can I get rid of this whitespace?
Example with purple boxes that show whitespace in text element
This is an example with a longer text that works as expected:
<svg id="canvas-6" width="300px" height="75px" viewBox="0 0 300 75" xmlns="http://www.w3.org/2000/svg">
<text transform="translate(0,0)" class="knockout-text-value" id="fit-hidden-6" fill="#000" x="50%" y="50%" width="100%" text-anchor="middle" dominant-baseline="central" font-family="'Lato', sans-serif" font-size="60.785146891139px">TEST TEST</text>
<rect id="fit-text-6" class="knockout-text-bg" width="100%" height="100%" fill="red" x="0" y="0" fill-opacity="1" stroke="black" stroke-opacity="1" stroke-width="1" stroke-linecap="round" stroke-dasharray="5,5" mask="url(#knockout-text-6)"></rect>
<mask id="knockout-text-6">
<rect width="300px" height="100%" fill="#fff" stroke="#000" stroke-opacity="1" stroke-width="1" stroke-linecap="round" stroke-dasharray="5,5" x="0" y="0"></rect>
<text transform="translate(0,0)" class="knockout-text-value" id="fit-mask-6" fill="#000" x="50%" y="50%" text-anchor="middle" dominant-baseline="central" font-family="'Lato', sans-serif" font-size="60.785146891139px">TEST TEST</text>
</mask>
</svg>
This is an example that has the whitespace still inside its SVG canvas:
<svg id="canvas-5" width="300px" height="134px" viewBox="0 0 300 134" xmlns="http://www.w3.org/2000/svg">
<text transform="translate(0,0)" class="knockout-text-value" id="fit-hidden-5" fill="#000" x="50%" y="50%" width="100%" text-anchor="middle" dominant-baseline="central" font-family="'Lato', sans-serif" font-size="109.0909090909091px">TEST</text>
<rect id="fit-text-5" class="knockout-text-bg" width="100%" height="100%" fill="red" x="0" y="0" fill-opacity="1" stroke="black" stroke-opacity="1" stroke-width="1" stroke-linecap="round" stroke-dasharray="5,5" mask="url(#knockout-text-5)"></rect>
<mask id="knockout-text-5">
<rect width="300px" height="100%" fill="#fff" stroke="#000" stroke-opacity="1" stroke-width="1" stroke-linecap="round" stroke-dasharray="5,5" x="0" y="0"></rect>
<text transform="translate(0,0)" class="knockout-text-value" id="fit-mask-5" fill="#000" x="50%" y="50%" text-anchor="middle" dominant-baseline="central" font-family="'Lato', sans-serif" font-size="109.0909090909091px">TEST</text>
</mask>
</svg>
Try adding { display: block } on the svg.

Variable text in SVG defined text tag

I would like to re-use def-ined shapes in SVG but with variable text.
Is the following somehow possibel ?
<svg width="1000pt" height="1000pt" viewBox="0.00 0.00 1000.00 1000.00" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<defs>
<g id="shape">
<rect x="10" y="0" rx="5" ry="5" width="80" height="40" style="fill:lightblue;stroke-width:0,opacity:0.5" />
<text text-anchor="middle" x="40" y="20" font-family="Helvetica,sans-Serif" font-size="8.00">variable_text</text>
</g>
</defs>
<g transform="translate(0 0)">
<use xlink:href="#shape" text="test" />
</g>
<g transform="translate(100 0)">
<use xlink:href="#shape" text="test2" />
</g>
</svg>
EDIT: since the solution would probably involve some javascript I have added the tag.
Clone the template and adjust as necessary.
let shape = document.getElementById("shape");
Array.from(document.getElementsByTagName("use")).forEach((use) => {
let text = use.getAttribute("text");
let clone = shape.cloneNode(true);
// might want to do something more robust here
clone.children[1].textContent = text;
use.parentNode.appendChild(clone);
use.parentNode.removeChild(use);
})
<svg width="1000pt" height="1000pt" viewBox="0.00 0.00 1000.00 1000.00" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<defs>
<g id="shape">
<rect x="10" y="0" rx="5" ry="5" width="80" height="40" style="fill:lightblue;stroke-width:0,opacity:0.5" />
<text text-anchor="middle" x="40" y="20" font-family="Helvetica,sans-Serif" font-size="8.00">variable_text</text>
</g>
</defs>
<g transform="translate(0 0)">
<use xlink:href="#shape" text="test" />
</g>
<g transform="translate(100 0)">
<use xlink:href="#shape" text="test2" />
</g>
</svg>

Calculate SVG.Text Length before drawing [duplicate]

I want to color the background of svg text similar to background-color in css
I was only able to find documentation on fill, which colors the text itself
Is it even possible?
You could use a filter to generate the background.
<svg width="100%" height="100%">
<defs>
<filter x="0" y="0" width="1" height="1" id="solid">
<feFlood flood-color="yellow" result="bg" />
<feMerge>
<feMergeNode in="bg"/>
<feMergeNode in="SourceGraphic"/>
</feMerge>
</filter>
</defs>
<text filter="url(#solid)" x="20" y="50" font-size="50">solid background</text>
</svg>
No this is not possible, SVG elements do not have background-... presentation attributes.
To simulate this effect you could draw a rectangle behind the text attribute with fill="green" or something similar (filters). Using JavaScript you could do the following:
var ctx = document.getElementById("the-svg"),
textElm = ctx.getElementById("the-text"),
SVGRect = textElm.getBBox();
var rect = document.createElementNS("http://www.w3.org/2000/svg", "rect");
rect.setAttribute("x", SVGRect.x);
rect.setAttribute("y", SVGRect.y);
rect.setAttribute("width", SVGRect.width);
rect.setAttribute("height", SVGRect.height);
rect.setAttribute("fill", "yellow");
ctx.insertBefore(rect, textElm);
The solution I have used is:
<svg>
<line x1="100" y1="100" x2="500" y2="100" style="stroke:black; stroke-width: 2"/>
<text x="150" y="105" style="stroke:white; stroke-width:0.6em">Hello World!</text>
<text x="150" y="105" style="fill:black">Hello World!</text>
</svg>
A duplicate text item is being placed, with stroke and stroke-width attributes. The stroke should match the background colour, and the stroke-width should be just big enough to create a "splodge" on which to write the actual text.
A bit of a hack and there are potential issues, but works for me!
Instead of using a <text> tag, the <foreignObject> tag can be used, which allows for XHTML content with CSS.
No, you can not add background color to SVG elements. You can do it programmatically with d3.
var text = d3.select("text");
var bbox = text.node().getBBox();
var padding = 2;
var rect = self.svg.insert("rect", "text")
.attr("x", bbox.x - padding)
.attr("y", bbox.y - padding)
.attr("width", bbox.width + (padding*2))
.attr("height", bbox.height + (padding*2))
.style("fill", "red");
Answer by Robert Longson (#RobertLongson) with modifications:
<svg width="100%" height="100%">
<defs>
<filter x="0" y="0" width="1" height="1" id="solid">
<feFlood flood-color="yellow"/>
<feComposite in="SourceGraphic" operator="xor"/>
</filter>
</defs>
<text filter="url(#solid)" x="20" y="50" font-size="50"> solid background </text>
<text x="20" y="50" font-size="50">solid background</text>
</svg>
and we have no bluring and no heavy "getBBox" :)
Padding is provided by white spaces in text-element with filter.
It's worked for me
Going further with #dbarton_uk answer, to avoid duplicating text you can use paint-order=stroke style:
<svg>
<line x1="100" y1="100" x2="350" y2="100" style="stroke:grey; stroke-width: 100"/>
<text x="150" y="105" style="stroke:white; stroke-width:0.5em; fill:black; paint-order:stroke; stroke-linejoin:round">Hello World!</text>
</svg>
Note the stroke-linejoin:round which is needed to avoid seeing spikes for the W sharp angle.
You can combine filter with the text.
<!DOCTYPE html>
<html>
<head>
<meta charset=utf-8 />
<title>SVG colored patterns via mask</title>
</head>
<body>
<svg viewBox="0 0 300 300" xmlns="http://www.w3.org/2000/svg">
<defs>
<filter x="0" y="0" width="1" height="1" id="bg-text">
<feFlood flood-color="white"/>
<feComposite in="SourceGraphic" operator="xor" />
</filter>
</defs>
<!-- something has already existed -->
<rect fill="red" x="150" y="20" width="100" height="50" />
<circle cx="50" cy="50" r="50" fill="blue"/>
<!-- Text render here -->
<text filter="url(#bg-text)" fill="black" x="20" y="50" font-size="30">text with color</text>
<text fill="black" x="20" y="50" font-size="30">text with color</text>
</svg>
</body>
</html>
For those wondering how to apply padding to a text element when it has a background like in the Robert's answer, do the following:
<svg>
<defs>
<filter x="-0.1" y="-0.1" width="1.2" height="1.2" id="solid">
<feFlood flood-color="#171717"/>
<feComposite in="SourceGraphic" operator="xor" />
</filter>
</defs>
<text filter="url(#solid)" x="20" y="50" font-size="50">Hello</text>
</svg>
In the example above, filter's x and y positions can be used as transform: translate(-10%, -10%) would, and width and height values can be read as 120% and 120%. So we made background 20% bigger, and offsetted it -10%, so background is now 10% bigger on each side of the text.
this is my favorite hack (not sure it should work). It refer an element that is not yet displayed, and it works pretty well
<svg version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 620 40" preserveAspectRatio="xMidYMid meet">
<defs>
<filter x="-0.02" y="0" width="1.04" height="1.1" id="removebackground">
<feFlood flood-color="#00ffff"/>
</filter>
</defs>
<!--Draw the text-->
<use xlink:href="#mygroup" filter="url(#removebackground)" />
<g id="mygroup">
<text id="text1" x="9" y="20" style="text-anchor:start;font-size:14px;">custom text with background</text>
<line x1="200" y1="18" x2="200" y2="36" stroke="#000" stroke-width="5"/>
<line x1="120" y1="27" x2="203" y2="27" stroke="#000" stroke-width="5"/>
</g>
</svg>
The previous answers relied on doubling up text and lacked sufficient whitespace.
By using atop and I was able to get the results I wanted.
This example also includes arrows, a common use case for SVG text labels:
<svg viewBox="-105 -40 210 234">
<title>Size Guide</title>
<defs>
<filter x="0" y="0" width="1" height="1" id="solid">
<feFlood flood-color="white"></feFlood>
<feComposite in="SourceGraphic" operator="atop"></feComposite>
</filter>
<marker id="arrow" viewBox="0 0 10 10" refX="5" refY="5" markerWidth="6" markerHeight="6" orient="auto-start-reverse">
<path d="M 0 0 L 10 5 L 0 10 z"></path>
</marker>
</defs>
<g id="garment">
<path id="right-body" fill="none" stroke="black" stroke-width="1" stroke-linejoin="round" d="M0 0 l30 0 l0 154 l-30 0"></path>
<path id="right-sleeve" d="M30 0 l35 0 l0 120 l-35 0" fill="none" stroke-linejoin="round" stroke="black" stroke-width="1"></path>
<use id="left-body" href="#right-body" transform="scale(-1,1)"></use>
<use id="left-sleeve" href="#right-sleeve" transform="scale(-1,1)"></use>
<path id="collar-right-top" fill="none" stroke="black" stroke-width="1" stroke-linejoin="round" d="M0 -6.5 l11.75 0 l6.5 6.5"></path>
<use id="collar-left-top" href="#collar-right-top" transform="scale(-1,1)"></use>
<path id="collar-left" fill="white" stroke="black" stroke-width="1" stroke-linejoin="round" d="M-11.75 -6.5 l-6.5 6.5 l30 77 l6.5 -6.5 Z"></path>
<path id="front-right" fill="white" stroke="black" stroke-width="1" d="M18.25 0 L30 0 l0 154 l-41.75 0 l0 -77 Z"></path>
<line x1="0" y1="0" x2="0" y2="154" stroke="black" stroke-width="1" stroke-dasharray="1 3"></line>
<use id="collar-right" href="#collar-left" transform="scale(-1,1)"></use>
</g>
<g id="dimension-labels">
<g id="dimension-sleeve-length">
<line marker-start="url(#arrow)" marker-end="url(#arrow)" x1="85" y1="0" x2="85" y2="120" stroke="black" stroke-width="1"></line>
<text font-size="10" filter="url(#solid)" fill="black" x="85" y="60" class="dimension" text-anchor="middle" dominant-baseline="middle"> 120 cm</text>
</g>
<g id="dimension-length">
<line marker-start="url(#arrow)" marker-end="url(#arrow)" x1="-85" y1="0" x2="-85" y2="154" stroke="black" stroke-width="1"></line>
<text font-size="10" filter="url(#solid)" fill="black" x="-85" y="77" text-anchor="middle" dominant-baseline="middle" class="dimension"> 154 cm</text>
</g>
<g id="dimension-sleeve-to-sleeve">
<line marker-start="url(#arrow)" marker-end="url(#arrow)" x1="-65" y1="-20" x2="65" y2="-20" stroke="black" stroke-width="1"></line>
<text font-size="10" filter="url(#solid)" fill="black" x="0" y="-20" text-anchor="middle" dominant-baseline="middle" class="dimension"> 130 cm </text>
</g>
<g title="Back Width" id="dimension-back-width">
<line marker-start="url(#arrow)" marker-end="url(#arrow)" x1="-30" y1="174" x2="30" y2="174" stroke="black" stroke-width="1"></line>
<text font-size="10" filter="url(#solid)" fill="black" x="0" y="174" text-anchor="middle" dominant-baseline="middle" class="dimension"> 60 cm </text>
</g>
</g>
</svg>
An obvious workaround to the problem of the blur produced by the filter effect is to render the <text> two times: once for the background (with transparent characters) and once for the characters (without a background filter).
For me, this was the only way to make the text readable in Safari.
<svg width="100%" height="100%">
<filter x="0" y="0" width="1" height="1" id="solid">
<feFlood flood-color="yellow" />
</filter>
<g transform="translate(20, 50)" font-size="50">
<text aria-hidden="true" fill="none" filter="url(#solid)">solid background</text>
<text fill="blue">solid background</text>
</g>
</svg>
The aria-hidden="true" attribute is there to prevent screen readers from speaking the text twice, if the user uses a screen reader.
You can add style to your text:
style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0);
text-shadow: rgb(255, 255, 255) -2px -2px 0px, rgb(255, 255, 255) -2px 2px 0px,
rgb(255, 255, 255) 2px -2px 0px, rgb(255, 255, 255) 2px 2px 0px;"
White, in this example.
Does not work in IE :)

Adding image to SVG circles

I'm trying to add some background image to SVG nodes "circle".
I have read a lot of stackoverflow answer and everybody is saying that we need to add a node into a to define our image.
I tried this but my image is not displaying at all.
Here is a fiddle of my code: https://jsfiddle.net/baapu6wz/ .
What did I miss ?
<svg baseProfile="full" version="1.1" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns="http://www.w3.org/2000/svg" height="390" width="1629">
<g transform="translate(40,0)">
<g>
<line y2="149.3060251652327" x2="819.8567597731511" y1="222.22245513917517" x1="854.7332277213098" style="stroke: #999;" stroke-width="5"></line>
<line y2="213.47136779636722" x2="768.9096407109324" y1="213.47136779636722" x1="768.9096407109324" style="stroke: #999;" stroke-width="5"></line>
<line y2="213.47136779636722" x2="768.9096407109324" y1="149.3060251652327" x1="819.8567597731511" style="stroke: #999;" stroke-width="5"></line>
</g>
<g>
<g transform="translate(854.7332277213098, 222.22245513917517)">
<circle fill="url(#image1);" fillOpacity="0.5" r="16"></circle>
<text x="20" dy="3">pagx</text>
</g>
<g transform="translate(768.9096407109324, 213.47136779636722)">
<circle fill="url(#image1);" fillOpacity="0.5" r="10"></circle>
<text x="20" dy="3">xzreds</text>
</g>
<g transform="translate(819.8567597731511, 149.3060251652327)">
<circle fill="url(#image1);" fillOpacity="0.5" r="14"></circle>
<text x="20" dy="3">jzkcwv</text>
</g>
</g>
</g>
<defs>
<pattern width="16" height="16" patternUnits="userSpaceOnUse" y="0" x="0" id="image1">
<image xlink:href="https://www.google.fr/images/branding/googlelogo/1x/googlelogo_color_272x92dp.png" height="16" width="16" y="0" x="0"></image>
</pattern>
</defs>
You have a typo.
fill="url(#image1);"
should be
fill="url(#image1)"
Remove the semicolon.
https://jsfiddle.net/baapu6wz/1/

Google Chart API JavaScript change max hAxis value using a function

I was wondering, once the chart is loaded, is there a way to change Horizontal Max Window value (date range) with a function WITHOUT having to call the drawChart function again?
For example:
function changeWindow(){
chart.setOptions(hAxis.viewWindow.max = 2);
}
Original Code:
var chart;
function drawChart() {
var data = google.visualization.arrayToDataTable([
['Year', 'Sales', 'Expenses'],
['2004', 1000, 400],
['2005', 1170, 460],
['2006', 660, 1120],
['2007', 1030, 540]
]);
var options = {
title: 'Company Performance',
hAxis: {title: 'Year', titleTextStyle: {color: 'red'}}
};
chart = new google.visualization.AreaChart(document.getElementById('chart_div'));
chart.draw(data, options);
}
When you draw the chart, Google Visualization will populate three different elements in the target <div> you have. Taking the sample from Google Playground for Line Chart, this is the code that it generates:
<div style="position: relative; width: 500px; height: 400px;" dir="ltr">
<div style="position: absolute; left: 0px; top: 0px; width: 100%; height: 100%;">
<svg width="500" height="400" style="overflow: hidden;">
<defs id="defs">
<clipPath id="_ABSTRACT_RENDERER_ID_0">
<rect x="96" y="77" width="309" height="247">
</clipPath>
</defs>
<rect x="0" y="0" width="500" height="400" stroke="none" stroke-width="0" fill="#ffffff">
<g>
<rect x="417" y="77" width="71" height="50" stroke="none" stroke-width="0" fill-opacity="0" fill="#ffffff">
<g>
<rect x="417" y="77" width="71" height="12" stroke="none" stroke-width="0" fill-opacity="0" fill="#ffffff">
<g>
<text text-anchor="start" x="434" y="87.2" font-family="Arial" font-size="12" stroke="none" stroke-width="0" fill="#222222">Cats</text>
</g>
<rect x="417" y="77" width="12" height="12" stroke="none" stroke-width="0" fill="#3366cc">
</g>
<g>
<rect x="417" y="96" width="71" height="12" stroke="none" stroke-width="0" fill-opacity="0" fill="#ffffff">
<g>
<text text-anchor="start" x="434" y="106.2" font-family="Arial" font-size="12" stroke="none" stroke-width="0" fill="#222222">Blanket 1</text>
</g>
<rect x="417" y="96" width="12" height="12" stroke="none" stroke-width="0" fill="#dc3912">
</g>
<g>
<rect x="417" y="115" width="71" height="12" stroke="none" stroke-width="0" fill-opacity="0" fill="#ffffff">
<g>
<text text-anchor="start" x="434" y="125.2" font-family="Arial" font-size="12" stroke="none" stroke-width="0" fill="#222222">Blanket 2</text>
</g>
<rect x="417" y="115" width="12" height="12" stroke="none" stroke-width="0" fill="#ff9900">
</g>
</g>
<g>
<rect x="96" y="77" width="309" height="247" stroke="none" stroke-width="0" fill-opacity="0" fill="#ffffff">
<g clip-path="url(#_ABSTRACT_RENDERER_ID_0)">
<g>
<rect x="96" y="323" width="309" height="1" stroke="none" stroke-width="0" fill="#cccccc">
<rect x="96" y="262" width="309" height="1" stroke="none" stroke-width="0" fill="#cccccc">
<rect x="96" y="200" width="309" height="1" stroke="none" stroke-width="0" fill="#cccccc">
<rect x="96" y="139" width="309" height="1" stroke="none" stroke-width="0" fill="#cccccc">
<rect x="96" y="77" width="309" height="1" stroke="none" stroke-width="0" fill="#cccccc">
</g>
<g>
<rect x="96" y="323" width="309" height="1" stroke="none" stroke-width="0" fill="#333333">
</g>
<g>
</g>
<g>
<g>
</g>
<g>
</svg>
</div>
</div>
In order to change the size of the chart, you would have to adjust the two internal divs, the size of the SVG itself, and the X/Y coordinates of every single element within that chart. You can do this with Javascript, but it is going to be far easier just to call draw() again.

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