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"source": "import { DEFAULT_PRECISION } from \"./_constants\"\nimport { getData, strokeToFill } from \"./_data\"\nimport { convertPathToNode, segmentToD, styleAttrs, svgElem } from \"./_utils\"\n\nexport const GradientPath = class {\n constructor({ path, segments, samples, precision = DEFAULT_PRECISION }) {\n // If the path being passed isn't a DOM node already, make it one\n this.path = convertPathToNode(path)\n\n this.segments = segments\n this.samples = samples\n this.precision = precision\n\n // Check if nodeName is path and that the path is closed, otherwise it's closed by default\n this.pathClosed =\n this.path.nodeName == \"path\"\n ? this.path.getAttribute(\"d\").match(/z/gi)\n : true\n\n // Store the render cycles that the user creates\n this.renders = []\n\n // Append a group to the SVG to capture everything we render and ensure our paths and circles are properly encapsulated\n this.svg = path.closest(\"svg\")\n this.group = svgElem(\"g\", {\n class: \"gradient-path\",\n })\n\n // Get the data\n this.data = getData({ path, segments, samples, precision })\n\n // Append the main group to the SVG\n this.svg.appendChild(this.group)\n\n // Remove the main path once we have the data values\n this.path.parentNode.removeChild(this.path)\n }\n\n remove() {\n this.group.parentNode.removeChild(this.group)\n }\n\n render({\n type,\n stroke = [\"white\", \"black\", \"white\"],\n strokeWidth = 1,\n fill = [\"white\", \"black\", \"white\"],\n width,\n animation = {},\n }) {\n // Store information from this render cycle\n const renderCycle = {}\n\n // Create a group for each element\n const elemGroup = svgElem(\"g\", { class: `element-${type}` })\n\n this.group.appendChild(elemGroup)\n renderCycle.group = elemGroup\n\n if (type === \"path\") {\n // If we specify a width and fill, then we need to outline the path and then average the join points of the segments\n // If we do not specify a width and fill, then we will be stroking and can leave the data \"as is\"\n renderCycle.data =\n width && fill\n ? strokeToFill(this.data, width, this.precision, this.pathClosed)\n : this.data\n\n for (let j = 0; j < renderCycle.data.length; j++) {\n const { samples, progress } = renderCycle.data[j]\n\n // Create a path for each segment and append it to its elemGroup\n elemGroup.appendChild(\n svgElem(\"path\", {\n class: \"path-segment\",\n d: segmentToD(samples),\n ...styleAttrs(fill, stroke, strokeWidth, progress, animation),\n })\n )\n }\n } else if (type === \"circle\") {\n renderCycle.data = this.data.flatMap(({ samples }) => samples)\n\n for (let j = 0; j < renderCycle.data.length; j++) {\n const { x, y, progress } = renderCycle.data[j]\n\n // Create a circle for each sample and append it to its elemGroup\n elemGroup.appendChild(\n svgElem(\"circle\", {\n class: \"circle-sample\",\n cx: x,\n cy: y,\n r: width / 2,\n ...styleAttrs(fill, stroke, strokeWidth, progress, animation),\n })\n )\n }\n }\n\n // Save the information in the current renderCycle and pop it onto the renders array\n this.renders.push(renderCycle)\n\n // Return this for method chaining\n return this\n }\n}\n",
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"review": "## 6\n\n### Bugs\n- No explicit handling of cases where `path` might not be properly converted to a DOM node or may be misformatted.\n- Assumes all necessary imports and functions exist and function as intended without verifying their presence or their return types.\n\n### Optimizations\n- Consider adding type-checking or input validation for the `path` and other parameters in the constructor to ensure they meet expected criteria.\n- Error handling could be improved, particularly around DOM manipulations to handle unexpected behavior gracefully.\n- Remove the path element and its parent only if they are present to prevent potential runtime errors.\n- Performance could be enhanced by defensive copying or checking mutation behavior for reused data structures, e.g., `renderCycle.data`.\n\n### Good points\n- Uses modular imports and exports, indicating a well-structured codebase.\n- The `GradientPath` class design pattern is clear, separating concerns with methods focused on rendering and removal.\n- Configurable parameters for rendering give flexibility to users for customizing the output.\n\n### Summary\nThe provided code defines a `GradientPath` class used to render paths and circles based on a given SVG path element. It validates the path's closure status, removes the node after capturing data, and has rendering methods that support different configurations for customization. While the functionality is well compartmentalized, the code could benefit from improved validation, error handling, and certain performance optimizations.\n\n### Open source alternatives\n- [Snap.svg](http://snapsvg.io/): A JavaScript library for working with SVG.\n- [Two.js](https://two.js.org/): A two-dimensional drawing library for modern web browsers.",
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