82 lines
3.6 KiB
Markdown
82 lines
3.6 KiB
Markdown
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---
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id: 587d7fa8367417b2b2512bcc
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title: Display Shapes with SVG
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required:
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- src: 'https://cdnjs.cloudflare.com/ajax/libs/d3/4.3.0/d3.min.js'
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challengeType: 6
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---
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## Description
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<section id='description'>
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The last challenge created an <code>svg</code> element with a given width and height, which was visible because it had a <code>background-color</code> applied to it in the <code>style</code> tag. The code made space for the given width and height.
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The next step is to create a shape to put in the <code>svg</code> area. There are a number of supported shapes in SVG, such as rectangles and circles. They are used to display data. For example, a rectangle (<code><rect></code>) SVG shape could create a bar in a bar chart.
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When you place a shape into the <code>svg</code> area, you can specify where it goes with <code>x</code> and <code>y</code> coordinates. The origin point of (0, 0) is in the upper-left corner. Positive values for <code>x</code> push the shape to the right, and positive values for <code>y</code> push the shape down from the origin point.
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To place a shape in the middle of the 500 (width) x 100 (height) <code>svg</code> from last challenge, the <code>x</code> coordinate would be 250 and the <code>y</code> coordinate would be 50.
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An SVG <code>rect</code> has four attributes. There are the <code>x</code> and <code>y</code> coordinates for where it is placed in the <code>svg</code> area. It also has a <code>height</code> and <code>width</code> to specify the size.
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</section>
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## Instructions
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<section id='instructions'>
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Add a <code>rect</code> shape to the <code>svg</code> using <code>append()</code>, and give it a <code>width</code> attribute of 25 and <code>height</code> attribute of 100. Also, give the <code>rect</code> <code>x</code> and <code>y</code> attributes each set to 0.
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</section>
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## Tests
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<section id='tests'>
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```yml
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tests:
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- text: Your document should have 1 <code>rect</code> element.
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testString: 'assert($(''rect'').length == 1, ''Your document should have 1 <code>rect</code> element.'');'
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- text: The <code>rect</code> element should have a <code>width</code> attribute set to 25.
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testString: 'assert($(''rect'').attr(''width'') == ''25'', ''The <code>rect</code> element should have a <code>width</code> attribute set to 25.'');'
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- text: The <code>rect</code> element should have a <code>height</code> attribute set to 100.
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testString: 'assert($(''rect'').attr(''height'') == ''100'', ''The <code>rect</code> element should have a <code>height</code> attribute set to 100.'');'
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- text: The <code>rect</code> element should have an <code>x</code> attribute set to 0.
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testString: 'assert($(''rect'').attr(''x'') == ''0'', ''The <code>rect</code> element should have an <code>x</code> attribute set to 0.'');'
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- text: The <code>rect</code> element should have a <code>y</code> attribute set to 0.
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testString: 'assert($(''rect'').attr(''y'') == ''0'', ''The <code>rect</code> element should have a <code>y</code> attribute set to 0.'');'
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```
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</section>
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## Challenge Seed
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<section id='challengeSeed'>
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<div id='html-seed'>
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```html
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<body>
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<script>
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const dataset = [12, 31, 22, 17, 25, 18, 29, 14, 9];
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const w = 500;
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const h = 100;
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const svg = d3.select("body")
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.append("svg")
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.attr("width", w)
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.attr("height", h)
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// Add your code below this line
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// Add your code above this line
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</script>
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</body>
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```
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</div>
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</section>
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## Solution
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<section id='solution'>
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```js
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// solution required
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```
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</section>
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