2a:null 2b:["$","title",null,{"children":"geometric.polygonScaleY | Harry Stevens | Observable"}] 30:[] 2e:{"id":"0d9f3cad3a306111","slug":"geometric-polygonscaley","title":"geometric.polygonScaleY","thumbnail":"026681c74984e0497087075a5536c36e7dc624804fc700d97fb6b15c35bb0c37","access_level":"public","create_time":"$D2020-10-21T15:51:28.629Z","update_time":"$D2026-06-12T14:26:54.657Z","view_time":null,"first_public_time":"$D2020-10-21T15:51:58.603Z","fork":{"id":"6a1ed7280deae82c","slug":"geometric-polygonscalex","title":"geometric.polygonScaleX","owner":{"id":"be420f6a83563b92","login":"harrystevens","name":"Harry Stevens"}},"stars":0,"starred":false,"owner":{"type":"team","id":"be420f6a83563b92","login":"harrystevens","name":"Harry Stevens","avatar_url":"https://avatars-next.observableusercontent.com/bc9bae4b7e30062b343ae978a13454e29cd3f2daf3a800d0024043686ddf094b","tier":"starter_2024"},"version":219,"publish_version":null,"role":null,"authored":false,"authors":[{"type":"individual","id":"61e2153e05789733","login":"harrystevens","name":"Harry Stevens","avatar_url":"https://avatars-next.observableusercontent.com/bc9bae4b7e30062b343ae978a13454e29cd3f2daf3a800d0024043686ddf094b","tier":null}],"members":[{"type":"individual","id":"61e2153e05789733","login":"harrystevens","name":"Harry Stevens","avatar_url":"https://avatars-next.observableusercontent.com/bc9bae4b7e30062b343ae978a13454e29cd3f2daf3a800d0024043686ddf094b","tier":null,"role":"editor"}],"comments":[],"custom_thumbnail":false,"trashed":false,"subscribed":null,"forks":1,"collection":{"id":"cb194ebcc81c247f","slug":"geometric","title":"Geometric.js","owner":{"id":"be420f6a83563b92","login":"harrystevens","name":"Harry Stevens"}},"type":"notebook","body":{"title":"geometric.polygonScaleY","cells":[{"id":0,"value":"md`# geometric.polygonScaleY\n\n[geometric.polygonScaleY](https://github.com/HarryStevens/geometric#polygonScaleY)(polygon, scaleFactor[, origin]) returns the vertices resulting from scaling the vertical coordinates of a polygon by a scaleFactor (where 1 is the polygon's current size) from an origin point. The horizontal coordinates remain unchanged. If origin is not specified, the origin defaults to the polygon's centroid.\n\nThe returned polygon's area is equal to the input polygon's area multiplied by the scaleFactor.`","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":34,"value":"viewof scaleFactor = Inputs.range([0, 2], {\n label: \"Scale factor\",\n value: 1,\n step: .001\n});","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":29,"value":"{ \n const svg = d3.select(DOM.svg(width, height))\n .attr(\"class\", \"viz\");\n \n svg.append(\"rect\")\n .attr(\"width\", width)\n .attr(\"height\", height);\n \n svg.append(\"polygon\")\n .attr(\"points\", scaled);\n\n svg.append(\"polygon\")\n .style(\"opacity\", .1)\n .attr(\"points\", polygon);\n\n if (showVertices){\n svg.selectAll(\".scaled\")\n .data(scaled)\n .enter().append(\"circle\")\n .attr(\"class\", \"scaled\")\n .attr(\"r\", 2)\n .attr(\"transform\", d => `translate(${d})`);\n \n svg.selectAll(\".original\")\n .data(polygon)\n .enter().append(\"circle\")\n .attr(\"class\", \"original\")\n .style(\"fill-opacity\", .1)\n .attr(\"r\", 2)\n .attr(\"transform\", d => `translate(${d})`); \n }\n \n return svg.node();\n}","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":207,"value":"viewof showVertices = Inputs.toggle({ label: \"Show vertices\", value: true })","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":65,"value":"scaled = geometric.polygonScaleY(polygon, scaleFactor);","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":62,"value":"polygon = [\n [center[0] - 100, center[1]],\n [center[0] - 30, center[1]],\n [center[0] - 30, center[1] - 40],\n [center[0] - 10, center[1] - 97],\n [center[0] - 2, center[1] - 100],\n [center[0], center[1] - 130],\n [center[0] + 2, center[1] - 100],\n [center[0] + 10, center[1] - 97],\n [center[0] + 30, center[1] - 40],\n [center[0] + 30, center[1]],\n [center[0] + 100, center[1]],\n [center[0] + 100, center[1] + 120],\n [center[0] - 100, center[1] + 120]\n];","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":58,"value":"center = [width / 2, height / 2];","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":210,"value":"geometric.polygonArea(scaled) / geometric.polygonArea(polygon) / scaleFactor","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":19,"value":"md`## Style`","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":17,"value":"html`\n`","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":15,"value":"md`## Dimensions`","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":13,"value":"height = 640;","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":11,"value":"md`## Imports`","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":9,"value":"geometric = require(\"geometric@3\");","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":7,"value":"d3 = require(\"d3@5\");","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"}],"files":"$W30","stdlib":"1","titling":"auto"}} 2f:"$2e:body"