crates/irust_repl/irust_kernel/evcxr.ipynb

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   "source": [
    ":add rand regex plotters --features plotters/evcxr --default-features"
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   "id": "798a5e69-b290-4f26-a711-f28fafa4dab8",
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       "y = x^2\n",
       "</text>\n",
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       "</svg>\n",
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      ]
     },
     "metadata": {},
     "output_type": "display_data"
    }
   ],
   "source": [
    "use plotters::prelude::*;\n",
    "\n",
    "let figure = evcxr_figure((640, 480), |root| {\n",
    "    root.fill(&WHITE);\n",
    "    let mut chart = ChartBuilder::on(&root)\n",
    "        .caption(\"y=x^2\", (\"Arial\", 50).into_font())\n",
    "        .margin(5)\n",
    "        .x_label_area_size(30)\n",
    "        .y_label_area_size(30)\n",
    "        .build_ranged(-1f32..1f32, -0.1f32..1f32)?;\n",
    "\n",
    "    chart.configure_mesh().draw()?;\n",
    "\n",
    "    chart.draw_series(LineSeries::new(\n",
    "        (-50..=50).map(|x| x as f32 / 50.0).map(|x| (x, x * x)),\n",
    "        &RED,\n",
    "    )).unwrap()\n",
    "        .label(\"y = x^2\")\n",
    "        .legend(|(x,y)| PathElement::new(vec![(x,y), (x + 20,y)], &RED));\n",
    "\n",
    "    chart.configure_series_labels()\n",
    "        .background_style(&WHITE.mix(0.8))\n",
    "        .border_style(&BLACK)\n",
    "        .draw()?;\n",
    "    Ok(())\n",
    "});\n",
    "figure"
   ]
  }
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