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\nThis notebook was created as workshop material for the *Introduction to SVG and D3.js* course on Frontend Masters. Watch the [full video course here](https://frontendmasters.com/courses/d3/)!\n

\n\n# 5. Turn petals into flowers for each movie\n\nIt's time to turn our individual petals into flowers! To do that, we have to draw a certain number of petals for each movie, dependent on the data. Then we want to position those flowers (made up of multiple petals) in a grid, and for readability, let's add the movie's title to each flower.\n`","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":137,"value":"slide`\nHere's what the SVG should look like for each movie flower:\n${Object.assign(await FileAttachment(\"nest_flower.jpg\").image(), {\n alt: '',\n style: 'width: 100%; max-width: 640px;',\n})}\n\n

\n\\`\\` elements don't render anything, and instead we use them to **group** other elements to manipulate together. In this case, we use it to \\`translate\\` our \\`\\`s and \\`\\`.

\n\n
\n**Ok, let's use D3.js to build this together.**\n`","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":187,"value":"slide`\n${Object.assign(await FileAttachment(\"nest_g@4.jpg\").image(), {\n alt: '',\n style: 'width: 100%; max-width: 640px',\n})}\n`","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":177,"value":"g = svg.selectAll('g')\n .data(flowers).enter().append('g')","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":200,"value":"slide`\n${Object.assign(await FileAttachment(\"nest_text.jpg\").image(), {\n alt: '',\n style: 'width: 100%; max-width: 640px',\n})}\n`","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":203,"value":"text = g.append('text')","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":233,"value":"slide`\n

\n Now comes the interesting part: each film flower has a different number of petal \\`\\`s depending on the data. To dynamically create the correct number of \\`\\`s, we use the same *selectAll-data-enter-append* pattern as before. \n\n
\n${Object.assign(await FileAttachment(\"nest_path_data@1.jpg\").image(), {\n alt: '',\n style: 'width: 100%; max-width: 640px',\n})}\n\n
\n\nTurns out, \\`.data()\\` also accepts *functions*, so the key is to **write a function that returns an array of objects**:\n\n
\n
\n${Object.assign(await FileAttachment(\"nest_path_create@1.jpg\").image(), {\n alt: '',\n style: 'width: 100%; max-width: 640px',\n})}\n\n\n
\n
\n\n**↓** Make sure to toggle to see the resulting D3.js *selection*:\n

\n`","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":256,"value":"path = g.selectAll('path')\n .data(d => {\n return _.times(d.numPetals, i => {\n // create a copy of the parent data, and add in calculated rotation\n return Object.assign({}, d, {rotate: i * (360 / d.numPetals)})\n })\n }).enter().append('path')","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":279,"value":"md`\n## ✨ finally, flowers 🌸!\n\nNow that we have the \\`\\`s, \\`\\`s, and \\`\\`s created, let's set attributes and styles on them so that they'll render the way we want:\n`","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":26,"value":"container = {\n const svg = html``\n return scrollSVG(svg)\n}","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":222,"value":"{\n g.attr('transform', (d, i) => `translate(${d.translate})`)\n \n text.attr('text-anchor', 'middle')\n .attr('dy', '.35em')\n .style('font-size', '.7em')\n .style('font-style', 'italic')\n .text(d => _.truncate(d.title, {length: 20}))\n \n path.attr('transform', d => `rotate(${d.rotate})scale(${d.scale})`)\n .attr('d', d => d.path)\n .attr('fill', d => d.color)\n .attr('fill-opacity', 0.5)\n .attr('stroke', d => d.color)\n}","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":353,"value":"md`\nLet's code together to bring all that together in one place:\n`","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":357,"value":"{\n const svg = html``\n \n // ✨ OUR CODE HERE\n const g = d3.select(svg).selectAll('g').data(flowers).enter().append('g')\n .attr('transform', d => `translate(${d.translate})`)\n\n g.selectAll('path').data(d => {\n return _.times(d.numPetals, i => Object.assign({}, d, {rotate: i * (360 / d.numPetals)}))\n }).enter().append('path')\n .attr('transform', d => `rotate(${d.rotate}) scale(${d.scale})`)\n .attr('d', d => d.path)\n .attr('fill', d => d.color)\n .attr('fill-opacity', 0.5)\n .attr('stroke-width', 2)\n .attr('stroke', d => d.color)\n\n g.append('text').text(d => _.truncate(d.title, {length: 18}))\n .style('font-size', '.7em')\n .style('font-style', 'italic')\n .attr('text-anchor', 'middle')\n .attr('dy', '0.35em')\n \n return scrollSVG(svg)\n}","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":294,"value":"md`\n## ✨ svg transform: \\`rotate()\\`\nJust like the previous transforms, \\`rotate()\\` affects the whole coordinate system, and is set in **degrees** (unlike Javascript Math functions, which are set with radians...):\n`","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":300,"value":"viewof transform1 = form(html`\n\n`)","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":308,"value":"transformCode(transform1, `rotate(${transform1.rotate})`)","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":312,"value":"transformSVG(transform1, `rotate(${transform1.rotate})`)","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":315,"value":"viewof transform2 = form(html`\n\n`)","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":336,"value":"md`\n🚨 And just like before, the order in which you chain \\`rotate()\\` with \\`translate()\\` will dramatically differ in the resulting coordinate system, so be careful!\n`","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":320,"value":"transformCode(transform2,\n `translate(${_.round(transform2.translateX, 2)},${_.round(transform2.translateY, 2)})rotate(${_.round(transform2.rotate, 2)})`,\n `rotate(${_.round(transform2.rotate, 2)})translate(${_.round(transform2.translateX, 2)},${_.round(transform2.translateY, 2)})`)","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":325,"value":"transformSVG(transform2,\n `translate(${_.round(transform2.translateX, 2)},${_.round(transform2.translateY, 2)})rotate(${_.round(transform2.rotate, 2)})`,\n `rotate(${_.round(transform2.rotate, 2)})translate(${_.round(transform2.translateX, 2)},${_.round(transform2.translateY, 2)})`)","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":86,"value":"md `\n---\n\n

\n [6. Add filter by options →](https://observablehq.com/d/681e1e3eb92d6f08)\n

\n\n
\n
\n
\n
\n
\n
\n
\n\n`","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":8,"value":"md`\n### ~appendix~\n`","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":6,"value":"import {\n movies, slide, slide_style,\n svgHeight, scrollSVG, textWidth,\n transformCode, transformSVG,\n} from '@sxywu/workshop-utility-functions'","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":19,"value":"import {calculateData} from '2683357905679f61'","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":301,"value":"import {form} from '@mbostock/form-input'","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":347,"value":"flowers = calculateData(movies)","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":14,"value":"slide_style","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":225,"value":"svg = d3.select(container).select('svg')","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":31,"value":"d3 = require('d3')","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":40,"value":"_ = require('lodash')","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"}],"files":"$W45","stdlib":"1"}} 44:"$43:body"