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regl-splom\n\nMatrix of scatter plots. A wrapper over [regl-scatter2d](https://github.com/gl-vis/regl-scatter2d) for optimized intersected data rendering.\n\n* [x] minimal GPU memory footprint: N vs N*N in direct [regl-scatter2d](https://github.com/dy/regl-scatter2d) passes case.\n* [ ] optimized performance due to binary trees for 1d point clustering, opposed to default 2d quad clustering.\n\n\n## Usage\n\n[![npm install regl-splom](https://nodei.co/npm/regl-splom.png?mini=true)](https://npmjs.org/package/regl-splom/)\n\n```js\nlet regl = require('regl')({extensions: 'oes_element_index_uint'})\nlet createMatrix = require('regl-splom')\n\nlet scatterMatrix = createMatrix(regl)\n\n// pass data and views to display\nscatterMatrix.update(\n\t{ data: [[], [], ...], ranges, domains, viewport, size, color, border },\n\t{ data: [[], [], ...], ranges, domains, viewport, size, color, border }\n)\n\n// draw views by ids\nscatterMatrix.draw(0, 1, ...views)\n```\n\n## API\n\n### `splom = createSplom(regl)`\n\nCreates scatter matrix instance.\n\n### `splom.update(trace1, trace2, ...traces)`\n\nDefine passes for `draw` method. Every trace can include the following options:\n\nOption | Description\n---|---\n`data` | An array with arrays for the columns.\n`range` | Array with data ranges corresponding to `data`. Every range can be an array `[min, max]` or `[minX, minY, maxX, maxY]`. If undefined - detected automatically.\n`domain` | Array with domains for the data, ie. the area data dimension holds  within the `viewport`. Each domain can be an array `[min, max]` for symmetric placement or `[minX, minY, maxX, maxY]` for precise position. Domain values are from `0..1` interval, defining what area of the `viewport` a dimension holds. By default domains cover viewport evnely.\n`padding` | Padding within domains (in px), or list of paddings per-domain. By default `[0,0,0,0]`. Can be a number, an array or any [rectangle](https://github.com/dy/parse-rect) format.\n`color`, `size`, `borderColor`, `borderSize`, `opacity` | Points style.\n`marker` | Points marker.\n`diagonal` | Show or hide diagonal.\n`upper` | Show or hide upper half matrix.\n`lower` | Show or hide lower half matrix.\n`viewport` | Area that the plot holds within the canvas. Can take any [rectangle](https://github.com/dy/parse-rect) format.\n\u003c!-- `transpose` | Use transposed view of data, ie. swap columns and rows. --\u003e\n\u003c!-- `normalizeDomain` | Normalize domains to fit the viewport. --\u003e\n\u003c!-- `snap` | Enable snapping for the points, ie. hide invisible points --\u003e\n\n\n### `splom.draw(...ids?|...points?)`\n\nDraw all defined passes, or only selected ones provided by `ids`. 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