2a:null 2b:["$","title",null,{"children":"geometric.polygonScaleX | Harry Stevens | Observable"}] 30:[] 2e:{"id":"6a1ed7280deae82c","slug":"geometric-polygonscalex","title":"geometric.polygonScaleX","thumbnail":"7864de51b7b374324a00a9bfd978943d8b246b2657ddb0e976d8a7c005ee1ba4","access_level":"public","create_time":"$D2020-08-10T20:47:53.913Z","update_time":"$D2022-08-03T22:23:13.225Z","view_time":null,"first_public_time":"$D2020-10-21T15:50:59.411Z","fork":{"id":"c83f9ecc481d7c1f","slug":"geometric-polygonscale","title":"geometric.polygonScale","owner":{"id":"be420f6a83563b92","login":"harrystevens","name":"Harry Stevens"}},"stars":1,"starred":false,"owner":{"type":"team","id":"be420f6a83563b92","login":"harrystevens","name":"Harry Stevens","avatar_url":"https://avatars-next.observableusercontent.com/bc9bae4b7e30062b343ae978a13454e29cd3f2daf3a800d0024043686ddf094b","tier":"starter_2024"},"version":226,"publish_version":226,"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":4,"collection":{"id":"cb194ebcc81c247f","slug":"geometric","title":"Geometric.js","owner":{"id":"be420f6a83563b92","login":"harrystevens","name":"Harry Stevens"}},"type":"notebook","body":{"title":"geometric.polygonScaleX","cells":[{"id":0,"value":"md`# geometric.polygonScaleX\n\n[geometric.polygonScaleX](https://github.com/HarryStevens/geometric#polygonScaleX)(polygon, scaleFactor[, origin]) returns the vertices resulting from scaling the horizontal coordinates of a polygon by a scaleFactor (where 1 is the polygon's current size) from an origin point. The vertical 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":200,"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.polygonScaleX(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":213,"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 = 400;","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@2.2\");","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"}],"files":"$W30","stdlib":"1","titling":"auto"}} 2f:"$2e:body"