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实践","/document/monitor/guide/sentry","document/43.monitor/01.guide/05.sentry",{"title":1516,"path":1517,"stem":1518},"日志与告警","/document/monitor/guide/logging","document/43.monitor/01.guide/06.logging",{"id":1520,"title":1061,"body":1521,"description":3424,"extension":3425,"links":3426,"meta":3427,"navigation":3428,"path":1062,"seo":3429,"stem":1063,"__hash__":3430},"docs/document/29.d3/01.guide/05.shape.md",{"type":1522,"value":1523,"toc":3413},"minimal",[1524,1529,1542,1545,1549,1559,1669,1679,1682,1685,1695,1697,1701,1715,1838,1844,1984,2016,2019,2022,2033,2156,2158,2162,2169,2262,2268,2271,2274,2276,2280,2291,2452,2455,2458,2472,2474,2478,2492,2498,2664,2670,2832,2835,2841,3050,3059,3062,3065,3067,3071,3123,3125,3129,3134,3140,3145,3156,3161,3179,3184,3190,3192,3196,3199,3223,3404,3406,3409],[1525,1526,1528],"h2",{"id":1527},"引言","🎯 引言",[1530,1531,1532,1533,1537,1538,1541],"p",{},"柱状图用 ",[1534,1535,1536],"code",{},"rect"," 就能画，但折线、扇形这类图形要靠 SVG 的 ",[1534,1539,1540],{},"path"," 元素，它的路径字符串手写起来是灾难。学会这篇文章，你能掌握 D3 的图形生成器——把数据自动变成路径，轻松画出折线图、面积图和饼图。",[1543,1544],"hr",{},[1525,1546,1548],{"id":1547},"为什么需要生成器","🧱 为什么需要生成器",[1530,1550,1551,1552,1554,1555,1558],{},"先看一眼 SVG 折线的“真面目”。",[1534,1553,1540],{}," 元素靠 ",[1534,1556,1557],{},"d"," 属性描述形状：",[1560,1561,1566],"pre",{"className":1562,"code":1563,"language":1564,"meta":1565,"style":1565},"language-html shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","\u003Csvg width=\"400\" height=\"300\">\n    \u003Cpath d=\"M0,180 L100,60 L200,120 L300,240\" fill=\"none\" stroke=\"#5470c6\" />\n\u003C/svg>\n","html","",[1534,1567,1568,1612,1659],{"__ignoreMap":1565},[1569,1570,1573,1577,1581,1585,1588,1591,1595,1597,1600,1602,1604,1607,1609],"span",{"class":1571,"line":1572},"line",1,[1569,1574,1576],{"class":1575},"s86vT","\u003C",[1569,1578,1580],{"class":1579},"sd2Uz","svg",[1569,1582,1584],{"class":1583},"s50WR"," width",[1569,1586,1587],{"class":1575},"=",[1569,1589,1590],{"class":1575},"\"",[1569,1592,1594],{"class":1593},"sIEYB","400",[1569,1596,1590],{"class":1575},[1569,1598,1599],{"class":1583}," height",[1569,1601,1587],{"class":1575},[1569,1603,1590],{"class":1575},[1569,1605,1606],{"class":1593},"300",[1569,1608,1590],{"class":1575},[1569,1610,1611],{"class":1575},">\n",[1569,1613,1615,1618,1620,1623,1625,1627,1630,1632,1635,1637,1639,1642,1644,1647,1649,1651,1654,1656],{"class":1571,"line":1614},2,[1569,1616,1617],{"class":1575},"    \u003C",[1569,1619,1540],{"class":1579},[1569,1621,1622],{"class":1583}," d",[1569,1624,1587],{"class":1575},[1569,1626,1590],{"class":1575},[1569,1628,1629],{"class":1593},"M0,180 L100,60 L200,120 L300,240",[1569,1631,1590],{"class":1575},[1569,1633,1634],{"class":1583}," fill",[1569,1636,1587],{"class":1575},[1569,1638,1590],{"class":1575},[1569,1640,1641],{"class":1593},"none",[1569,1643,1590],{"class":1575},[1569,1645,1646],{"class":1583}," stroke",[1569,1648,1587],{"class":1575},[1569,1650,1590],{"class":1575},[1569,1652,1653],{"class":1593},"#5470c6",[1569,1655,1590],{"class":1575},[1569,1657,1658],{"class":1575}," />\n",[1569,1660,1662,1665,1667],{"class":1571,"line":1661},3,[1569,1663,1664],{"class":1575},"\u003C/",[1569,1666,1580],{"class":1579},[1569,1668,1611],{"class":1575},[1530,1670,1671,1674,1675,1678],{},[1534,1672,1673],{},"M0,180"," 表示“移动到点 (0,180)”，",[1534,1676,1677],{},"L100,60"," 表示“画一条线到点 (100,60)”……4 个点还能忍，500 个点的字符串能让人崩溃。",[1530,1680,1681],{},"上面这段手写代码的真实渲染效果——就是一条 4 个点的折线：",[1683,1684],"d3-raw-path",{},[1530,1686,1687,1694],{},[1688,1689,1690,1691,1693],"strong",{},"图形生成器就是帮我们生成 ",[1534,1692,1557],{}," 字符串的函数","：数据喂进去，路径字符串吐出来。",[1543,1696],{},[1525,1698,1700],{"id":1699},"d3line-折线图","🧱 d3.line 折线图",[1530,1702,1703,1706,1707,1710,1711,1714],{},[1534,1704,1705],{},"d3.line()"," 创建折线生成器，通过 ",[1534,1708,1709],{},".x()"," 和 ",[1534,1712,1713],{},".y()"," 告诉它：每个数据点的横纵坐标怎么取：",[1560,1716,1720],{"className":1717,"code":1718,"language":1719,"meta":1565,"style":1565},"language-js shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","const line = d3\n    .line()\n    .x((d) => xScale(d.day)) // 每个点的 x 坐标\n    .y((d) => yScale(d.value)); // 每个点的 y 坐标\n\nline(data); // 返回 \"M0,180 L100,60 L200,120...\" 这样的字符串\n","js",[1534,1721,1722,1736,1747,1784,1818,1825],{"__ignoreMap":1565},[1569,1723,1724,1727,1731,1733],{"class":1571,"line":1572},[1569,1725,1726],{"class":1583},"const",[1569,1728,1730],{"class":1729},"sndM8"," line ",[1569,1732,1587],{"class":1575},[1569,1734,1735],{"class":1729}," d3\n",[1569,1737,1738,1741,1744],{"class":1571,"line":1614},[1569,1739,1740],{"class":1575},"    .",[1569,1742,1571],{"class":1743},"swgpB",[1569,1745,1746],{"class":1729},"()\n",[1569,1748,1749,1751,1754,1757,1759,1762,1765,1768,1771,1774,1777,1780],{"class":1571,"line":1661},[1569,1750,1740],{"class":1575},[1569,1752,1753],{"class":1743},"x",[1569,1755,1756],{"class":1729},"(",[1569,1758,1756],{"class":1575},[1569,1760,1557],{"class":1761},"sK9QF",[1569,1763,1764],{"class":1575},")",[1569,1766,1767],{"class":1583}," =>",[1569,1769,1770],{"class":1743}," xScale",[1569,1772,1773],{"class":1729},"(d",[1569,1775,1776],{"class":1575},".",[1569,1778,1779],{"class":1729},"day)) ",[1569,1781,1783],{"class":1782},"syuKq","// 每个点的 x 坐标\n",[1569,1785,1787,1789,1792,1794,1796,1798,1800,1802,1805,1807,1809,1812,1815],{"class":1571,"line":1786},4,[1569,1788,1740],{"class":1575},[1569,1790,1791],{"class":1743},"y",[1569,1793,1756],{"class":1729},[1569,1795,1756],{"class":1575},[1569,1797,1557],{"class":1761},[1569,1799,1764],{"class":1575},[1569,1801,1767],{"class":1583},[1569,1803,1804],{"class":1743}," yScale",[1569,1806,1773],{"class":1729},[1569,1808,1776],{"class":1575},[1569,1810,1811],{"class":1729},"value))",[1569,1813,1814],{"class":1575},";",[1569,1816,1817],{"class":1782}," // 每个点的 y 坐标\n",[1569,1819,1821],{"class":1571,"line":1820},5,[1569,1822,1824],{"emptyLinePlaceholder":1823},true,"\n",[1569,1826,1828,1830,1833,1835],{"class":1571,"line":1827},6,[1569,1829,1571],{"class":1743},[1569,1831,1832],{"class":1729},"(data)",[1569,1834,1814],{"class":1575},[1569,1836,1837],{"class":1782}," // 返回 \"M0,180 L100,60 L200,120...\" 这样的字符串\n",[1530,1839,1840,1841,1843],{},"用法是把整个数据数组绑给一个 ",[1534,1842,1540],{},"：",[1560,1845,1847],{"className":1717,"code":1846,"language":1719,"meta":1565,"style":1565},"svg.append('path')\n    .datum(data) // 一条线是一个整体，用 datum 绑整个数组\n    .attr('d', line) // line 自动把数据转成路径\n    .attr('fill', 'none')\n    .attr('stroke', '#5470c6')\n    .attr('stroke-width', 2);\n",[1534,1848,1849,1870,1883,1907,1933,1958],{"__ignoreMap":1565},[1569,1850,1851,1853,1855,1858,1860,1863,1865,1867],{"class":1571,"line":1572},[1569,1852,1580],{"class":1729},[1569,1854,1776],{"class":1575},[1569,1856,1857],{"class":1743},"append",[1569,1859,1756],{"class":1729},[1569,1861,1862],{"class":1575},"'",[1569,1864,1540],{"class":1593},[1569,1866,1862],{"class":1575},[1569,1868,1869],{"class":1729},")\n",[1569,1871,1872,1874,1877,1880],{"class":1571,"line":1614},[1569,1873,1740],{"class":1575},[1569,1875,1876],{"class":1743},"datum",[1569,1878,1879],{"class":1729},"(data) ",[1569,1881,1882],{"class":1782},"// 一条线是一个整体，用 datum 绑整个数组\n",[1569,1884,1885,1887,1890,1892,1894,1896,1898,1901,1904],{"class":1571,"line":1661},[1569,1886,1740],{"class":1575},[1569,1888,1889],{"class":1743},"attr",[1569,1891,1756],{"class":1729},[1569,1893,1862],{"class":1575},[1569,1895,1557],{"class":1593},[1569,1897,1862],{"class":1575},[1569,1899,1900],{"class":1575},",",[1569,1902,1903],{"class":1729}," line) ",[1569,1905,1906],{"class":1782},"// line 自动把数据转成路径\n",[1569,1908,1909,1911,1913,1915,1917,1920,1922,1924,1927,1929,1931],{"class":1571,"line":1786},[1569,1910,1740],{"class":1575},[1569,1912,1889],{"class":1743},[1569,1914,1756],{"class":1729},[1569,1916,1862],{"class":1575},[1569,1918,1919],{"class":1593},"fill",[1569,1921,1862],{"class":1575},[1569,1923,1900],{"class":1575},[1569,1925,1926],{"class":1575}," '",[1569,1928,1641],{"class":1593},[1569,1930,1862],{"class":1575},[1569,1932,1869],{"class":1729},[1569,1934,1935,1937,1939,1941,1943,1946,1948,1950,1952,1954,1956],{"class":1571,"line":1820},[1569,1936,1740],{"class":1575},[1569,1938,1889],{"class":1743},[1569,1940,1756],{"class":1729},[1569,1942,1862],{"class":1575},[1569,1944,1945],{"class":1593},"stroke",[1569,1947,1862],{"class":1575},[1569,1949,1900],{"class":1575},[1569,1951,1926],{"class":1575},[1569,1953,1653],{"class":1593},[1569,1955,1862],{"class":1575},[1569,1957,1869],{"class":1729},[1569,1959,1960,1962,1964,1966,1968,1971,1973,1975,1979,1981],{"class":1571,"line":1827},[1569,1961,1740],{"class":1575},[1569,1963,1889],{"class":1743},[1569,1965,1756],{"class":1729},[1569,1967,1862],{"class":1575},[1569,1969,1970],{"class":1593},"stroke-width",[1569,1972,1862],{"class":1575},[1569,1974,1900],{"class":1575},[1569,1976,1978],{"class":1977},"smPcV"," 2",[1569,1980,1764],{"class":1729},[1569,1982,1983],{"class":1575},";\n",[1985,1986,1987,1990],"warning",{},[1530,1988,1989],{},"折线图两个经典坑：",[1991,1992,1993,2009],"ol",{},[1994,1995,1996,1997,2000,2001,2004,2005,2008],"li",{},"整条折线只有",[1688,1998,1999],{},"一个"," path，所以用 ",[1534,2002,2003],{},"datum(data)"," 绑整个数组，不是 ",[1534,2006,2007],{},"data(data)","——后者会按数据个数创建一堆 path。",[1994,2010,2011,2012,2015],{},"一定要设置 ",[1534,2013,2014],{},"fill: 'none'","，否则 path 默认填充黑色，折线会变成一坨实心色块。",[1530,2017,2018],{},"这段代码的真实渲染效果：",[2020,2021],"d3-line-demo",{},[1530,2023,2024,2025,2028,2029,2032],{},"另外，折线图 x 轴上的点是离散位置，推荐用 ",[1534,2026,2027],{},"scalePoint","：用法和 ",[1534,2030,2031],{},"scaleBand"," 一样，但它直接返回每个点的坐标，不需要再算柱子宽度：",[1560,2034,2036],{"className":1717,"code":2035,"language":1719,"meta":1565,"style":1565},"const xScale = d3\n    .scalePoint()\n    .domain(['周一', '周二', '周三', '周四', '周五'])\n    .range([0, width]);\n\nxScale('周三'); // 正好落在中间位置\n",[1534,2037,2038,2049,2057,2113,2132,2136],{"__ignoreMap":1565},[1569,2039,2040,2042,2045,2047],{"class":1571,"line":1572},[1569,2041,1726],{"class":1583},[1569,2043,2044],{"class":1729}," xScale ",[1569,2046,1587],{"class":1575},[1569,2048,1735],{"class":1729},[1569,2050,2051,2053,2055],{"class":1571,"line":1614},[1569,2052,1740],{"class":1575},[1569,2054,2027],{"class":1743},[1569,2056,1746],{"class":1729},[1569,2058,2059,2061,2064,2067,2069,2072,2074,2076,2078,2081,2083,2085,2087,2090,2092,2094,2096,2099,2101,2103,2105,2108,2110],{"class":1571,"line":1661},[1569,2060,1740],{"class":1575},[1569,2062,2063],{"class":1743},"domain",[1569,2065,2066],{"class":1729},"([",[1569,2068,1862],{"class":1575},[1569,2070,2071],{"class":1593},"周一",[1569,2073,1862],{"class":1575},[1569,2075,1900],{"class":1575},[1569,2077,1926],{"class":1575},[1569,2079,2080],{"class":1593},"周二",[1569,2082,1862],{"class":1575},[1569,2084,1900],{"class":1575},[1569,2086,1926],{"class":1575},[1569,2088,2089],{"class":1593},"周三",[1569,2091,1862],{"class":1575},[1569,2093,1900],{"class":1575},[1569,2095,1926],{"class":1575},[1569,2097,2098],{"class":1593},"周四",[1569,2100,1862],{"class":1575},[1569,2102,1900],{"class":1575},[1569,2104,1926],{"class":1575},[1569,2106,2107],{"class":1593},"周五",[1569,2109,1862],{"class":1575},[1569,2111,2112],{"class":1729},"])\n",[1569,2114,2115,2117,2120,2122,2125,2127,2130],{"class":1571,"line":1786},[1569,2116,1740],{"class":1575},[1569,2118,2119],{"class":1743},"range",[1569,2121,2066],{"class":1729},[1569,2123,2124],{"class":1977},"0",[1569,2126,1900],{"class":1575},[1569,2128,2129],{"class":1729}," width])",[1569,2131,1983],{"class":1575},[1569,2133,2134],{"class":1571,"line":1820},[1569,2135,1824],{"emptyLinePlaceholder":1823},[1569,2137,2138,2141,2143,2145,2147,2149,2151,2153],{"class":1571,"line":1827},[1569,2139,2140],{"class":1743},"xScale",[1569,2142,1756],{"class":1729},[1569,2144,1862],{"class":1575},[1569,2146,2089],{"class":1593},[1569,2148,1862],{"class":1575},[1569,2150,1764],{"class":1729},[1569,2152,1814],{"class":1575},[1569,2154,2155],{"class":1782}," // 正好落在中间位置\n",[1543,2157],{},[1525,2159,2161],{"id":2160},"curve-平滑曲线","🧱 curve 平滑曲线",[1530,2163,2164,2165,2168],{},"默认折线是生硬的直线段，加一句 ",[1534,2166,2167],{},".curve()"," 就变平滑：",[1560,2170,2172],{"className":1717,"code":2171,"language":1719,"meta":1565,"style":1565},"const line = d3\n    .line()\n    .x((d) => xScale(d.day))\n    .y((d) => yScale(d.value))\n    .curve(d3.curveMonotoneX); // 平滑，但保证经过每个数据点\n",[1534,2173,2174,2184,2192,2217,2242],{"__ignoreMap":1565},[1569,2175,2176,2178,2180,2182],{"class":1571,"line":1572},[1569,2177,1726],{"class":1583},[1569,2179,1730],{"class":1729},[1569,2181,1587],{"class":1575},[1569,2183,1735],{"class":1729},[1569,2185,2186,2188,2190],{"class":1571,"line":1614},[1569,2187,1740],{"class":1575},[1569,2189,1571],{"class":1743},[1569,2191,1746],{"class":1729},[1569,2193,2194,2196,2198,2200,2202,2204,2206,2208,2210,2212,2214],{"class":1571,"line":1661},[1569,2195,1740],{"class":1575},[1569,2197,1753],{"class":1743},[1569,2199,1756],{"class":1729},[1569,2201,1756],{"class":1575},[1569,2203,1557],{"class":1761},[1569,2205,1764],{"class":1575},[1569,2207,1767],{"class":1583},[1569,2209,1770],{"class":1743},[1569,2211,1773],{"class":1729},[1569,2213,1776],{"class":1575},[1569,2215,2216],{"class":1729},"day))\n",[1569,2218,2219,2221,2223,2225,2227,2229,2231,2233,2235,2237,2239],{"class":1571,"line":1786},[1569,2220,1740],{"class":1575},[1569,2222,1791],{"class":1743},[1569,2224,1756],{"class":1729},[1569,2226,1756],{"class":1575},[1569,2228,1557],{"class":1761},[1569,2230,1764],{"class":1575},[1569,2232,1767],{"class":1583},[1569,2234,1804],{"class":1743},[1569,2236,1773],{"class":1729},[1569,2238,1776],{"class":1575},[1569,2240,2241],{"class":1729},"value))\n",[1569,2243,2244,2246,2249,2252,2254,2257,2259],{"class":1571,"line":1820},[1569,2245,1740],{"class":1575},[1569,2247,2248],{"class":1743},"curve",[1569,2250,2251],{"class":1729},"(d3",[1569,2253,1776],{"class":1575},[1569,2255,2256],{"class":1729},"curveMonotoneX)",[1569,2258,1814],{"class":1575},[1569,2260,2261],{"class":1782}," // 平滑，但保证经过每个数据点\n",[1530,2263,2264,2267],{},[1534,2265,2266],{},"d3.curveMonotoneX"," 是最常用的平滑方式，曲线会穿过每个真实数据点，不会为了好看而“画过头”。",[1530,2269,2270],{},"真实渲染效果：平滑曲线严格穿过每个红色数据点：",[2272,2273],"d3-curve-demo",{},[1543,2275],{},[1525,2277,2279],{"id":2278},"d3area-面积图","🧱 d3.area 面积图",[1530,2281,2282,2283,2286,2287,2290],{},"面积图可以想象成“折线图 + 下方填色”。它比折线多一个下边界：",[1534,2284,2285],{},"y0"," 是下边界、",[1534,2288,2289],{},"y1"," 是上边界：",[1560,2292,2294],{"className":1717,"code":2293,"language":1719,"meta":1565,"style":1565},"const area = d3\n    .area()\n    .x((d) => xScale(d.day))\n    .y0(height) // 下边界：固定在底部\n    .y1((d) => yScale(d.value)); // 上边界：跟随数据\n\nsvg.append('path').datum(data).attr('d', area).attr('fill', 'rgba(84, 112, 198, 0.3)');\n",[1534,2295,2296,2307,2316,2340,2352,2381,2385],{"__ignoreMap":1565},[1569,2297,2298,2300,2303,2305],{"class":1571,"line":1572},[1569,2299,1726],{"class":1583},[1569,2301,2302],{"class":1729}," area ",[1569,2304,1587],{"class":1575},[1569,2306,1735],{"class":1729},[1569,2308,2309,2311,2314],{"class":1571,"line":1614},[1569,2310,1740],{"class":1575},[1569,2312,2313],{"class":1743},"area",[1569,2315,1746],{"class":1729},[1569,2317,2318,2320,2322,2324,2326,2328,2330,2332,2334,2336,2338],{"class":1571,"line":1661},[1569,2319,1740],{"class":1575},[1569,2321,1753],{"class":1743},[1569,2323,1756],{"class":1729},[1569,2325,1756],{"class":1575},[1569,2327,1557],{"class":1761},[1569,2329,1764],{"class":1575},[1569,2331,1767],{"class":1583},[1569,2333,1770],{"class":1743},[1569,2335,1773],{"class":1729},[1569,2337,1776],{"class":1575},[1569,2339,2216],{"class":1729},[1569,2341,2342,2344,2346,2349],{"class":1571,"line":1786},[1569,2343,1740],{"class":1575},[1569,2345,2285],{"class":1743},[1569,2347,2348],{"class":1729},"(height) ",[1569,2350,2351],{"class":1782},"// 下边界：固定在底部\n",[1569,2353,2354,2356,2358,2360,2362,2364,2366,2368,2370,2372,2374,2376,2378],{"class":1571,"line":1820},[1569,2355,1740],{"class":1575},[1569,2357,2289],{"class":1743},[1569,2359,1756],{"class":1729},[1569,2361,1756],{"class":1575},[1569,2363,1557],{"class":1761},[1569,2365,1764],{"class":1575},[1569,2367,1767],{"class":1583},[1569,2369,1804],{"class":1743},[1569,2371,1773],{"class":1729},[1569,2373,1776],{"class":1575},[1569,2375,1811],{"class":1729},[1569,2377,1814],{"class":1575},[1569,2379,2380],{"class":1782}," // 上边界：跟随数据\n",[1569,2382,2383],{"class":1571,"line":1827},[1569,2384,1824],{"emptyLinePlaceholder":1823},[1569,2386,2388,2390,2392,2394,2396,2398,2400,2402,2404,2406,2408,2410,2412,2414,2416,2418,2420,2422,2424,2427,2429,2431,2433,2435,2437,2439,2441,2443,2446,2448,2450],{"class":1571,"line":2387},7,[1569,2389,1580],{"class":1729},[1569,2391,1776],{"class":1575},[1569,2393,1857],{"class":1743},[1569,2395,1756],{"class":1729},[1569,2397,1862],{"class":1575},[1569,2399,1540],{"class":1593},[1569,2401,1862],{"class":1575},[1569,2403,1764],{"class":1729},[1569,2405,1776],{"class":1575},[1569,2407,1876],{"class":1743},[1569,2409,1832],{"class":1729},[1569,2411,1776],{"class":1575},[1569,2413,1889],{"class":1743},[1569,2415,1756],{"class":1729},[1569,2417,1862],{"class":1575},[1569,2419,1557],{"class":1593},[1569,2421,1862],{"class":1575},[1569,2423,1900],{"class":1575},[1569,2425,2426],{"class":1729}," area)",[1569,2428,1776],{"class":1575},[1569,2430,1889],{"class":1743},[1569,2432,1756],{"class":1729},[1569,2434,1862],{"class":1575},[1569,2436,1919],{"class":1593},[1569,2438,1862],{"class":1575},[1569,2440,1900],{"class":1575},[1569,2442,1926],{"class":1575},[1569,2444,2445],{"class":1593},"rgba(84, 112, 198, 0.3)",[1569,2447,1862],{"class":1575},[1569,2449,1764],{"class":1729},[1569,2451,1983],{"class":1575},[1530,2453,2454],{},"实际项目里常把两者叠着画：下面铺一层半透明面积，上面描一条折线，图表立刻有了层次感。下面就是“面积 + 平滑折线”组合的真实渲染效果：",[2456,2457],"d3-line-chart",{},[1985,2459,2460],{},[1530,2461,2462,2463,2471],{},"叠着画时要注意：",[1688,2464,2465,2466,2468,2469],{},"折线加了 ",[1534,2467,2167],{},"，面积图也必须加同样的 ",[1534,2470,2167],{},"。否则折线是平滑曲线、面积还是直线拼接，填充区域的边缘会和折线对不上，露出难看的缝隙。",[1543,2473],{},[1525,2475,2477],{"id":2476},"d3arc-d3pie-饼图","🧱 d3.arc + d3.pie 饼图",[1530,2479,2480,2481,2491],{},"饼图要两个生成器配合，分工明确：",[1688,2482,2483,2486,2487,2490],{},[1534,2484,2485],{},"pie"," 算角度，",[1534,2488,2489],{},"arc"," 画扇形","。",[1530,2493,2494,2495,2497],{},"第一步，",[1534,2496,2485],{}," 把数值换算成每个扇形的起止角度：",[1560,2499,2501],{"className":1717,"code":2500,"language":1719,"meta":1565,"style":1565},"const data = [\n    { name: '手机', value: 45 },\n    { name: '电脑', value: 30 },\n    { name: '平板', value: 25 },\n];\n\nconst pie = d3.pie().value((d) => d.value);\npie(data); // 返回带角度的新数组\n",[1534,2502,2503,2515,2546,2572,2598,2605,2609,2652],{"__ignoreMap":1565},[1569,2504,2505,2507,2510,2512],{"class":1571,"line":1572},[1569,2506,1726],{"class":1583},[1569,2508,2509],{"class":1729}," data ",[1569,2511,1587],{"class":1575},[1569,2513,2514],{"class":1729}," [\n",[1569,2516,2517,2520,2523,2526,2528,2531,2533,2535,2538,2540,2543],{"class":1571,"line":1614},[1569,2518,2519],{"class":1575},"    {",[1569,2521,2522],{"class":1579}," name",[1569,2524,2525],{"class":1575},":",[1569,2527,1926],{"class":1575},[1569,2529,2530],{"class":1593},"手机",[1569,2532,1862],{"class":1575},[1569,2534,1900],{"class":1575},[1569,2536,2537],{"class":1579}," value",[1569,2539,2525],{"class":1575},[1569,2541,2542],{"class":1977}," 45",[1569,2544,2545],{"class":1575}," },\n",[1569,2547,2548,2550,2552,2554,2556,2559,2561,2563,2565,2567,2570],{"class":1571,"line":1661},[1569,2549,2519],{"class":1575},[1569,2551,2522],{"class":1579},[1569,2553,2525],{"class":1575},[1569,2555,1926],{"class":1575},[1569,2557,2558],{"class":1593},"电脑",[1569,2560,1862],{"class":1575},[1569,2562,1900],{"class":1575},[1569,2564,2537],{"class":1579},[1569,2566,2525],{"class":1575},[1569,2568,2569],{"class":1977}," 30",[1569,2571,2545],{"class":1575},[1569,2573,2574,2576,2578,2580,2582,2585,2587,2589,2591,2593,2596],{"class":1571,"line":1786},[1569,2575,2519],{"class":1575},[1569,2577,2522],{"class":1579},[1569,2579,2525],{"class":1575},[1569,2581,1926],{"class":1575},[1569,2583,2584],{"class":1593},"平板",[1569,2586,1862],{"class":1575},[1569,2588,1900],{"class":1575},[1569,2590,2537],{"class":1579},[1569,2592,2525],{"class":1575},[1569,2594,2595],{"class":1977}," 25",[1569,2597,2545],{"class":1575},[1569,2599,2600,2603],{"class":1571,"line":1820},[1569,2601,2602],{"class":1729},"]",[1569,2604,1983],{"class":1575},[1569,2606,2607],{"class":1571,"line":1827},[1569,2608,1824],{"emptyLinePlaceholder":1823},[1569,2610,2611,2613,2616,2618,2621,2623,2625,2628,2630,2633,2635,2637,2639,2641,2643,2645,2647,2650],{"class":1571,"line":2387},[1569,2612,1726],{"class":1583},[1569,2614,2615],{"class":1729}," pie ",[1569,2617,1587],{"class":1575},[1569,2619,2620],{"class":1729}," d3",[1569,2622,1776],{"class":1575},[1569,2624,2485],{"class":1743},[1569,2626,2627],{"class":1729},"()",[1569,2629,1776],{"class":1575},[1569,2631,2632],{"class":1743},"value",[1569,2634,1756],{"class":1729},[1569,2636,1756],{"class":1575},[1569,2638,1557],{"class":1761},[1569,2640,1764],{"class":1575},[1569,2642,1767],{"class":1583},[1569,2644,1622],{"class":1729},[1569,2646,1776],{"class":1575},[1569,2648,2649],{"class":1729},"value)",[1569,2651,1983],{"class":1575},[1569,2653,2655,2657,2659,2661],{"class":1571,"line":2654},8,[1569,2656,2485],{"class":1743},[1569,2658,1832],{"class":1729},[1569,2660,1814],{"class":1575},[1569,2662,2663],{"class":1782}," // 返回带角度的新数组\n",[1530,2665,2666,2669],{},[1534,2667,2668],{},"pie(data)"," 的返回值大概长这样（角度单位是弧度，一圈是 6.28）：",[1560,2671,2673],{"className":1717,"code":2672,"language":1719,"meta":1565,"style":1565},"[\n    { data: { name: '手机', value: 45 }, startAngle: 0, endAngle: 2.83 },\n    { data: { name: '电脑', value: 30 }, startAngle: 2.83, endAngle: 4.71 },\n    { data: { name: '平板', value: 25 }, startAngle: 4.71, endAngle: 6.28 },\n]\n",[1534,2674,2675,2680,2733,2780,2827],{"__ignoreMap":1565},[1569,2676,2677],{"class":1571,"line":1572},[1569,2678,2679],{"class":1729},"[\n",[1569,2681,2682,2684,2687,2689,2692,2694,2696,2698,2700,2702,2704,2706,2708,2710,2713,2716,2718,2721,2723,2726,2728,2731],{"class":1571,"line":1614},[1569,2683,2519],{"class":1575},[1569,2685,2686],{"class":1579}," data",[1569,2688,2525],{"class":1575},[1569,2690,2691],{"class":1575}," {",[1569,2693,2522],{"class":1579},[1569,2695,2525],{"class":1575},[1569,2697,1926],{"class":1575},[1569,2699,2530],{"class":1593},[1569,2701,1862],{"class":1575},[1569,2703,1900],{"class":1575},[1569,2705,2537],{"class":1579},[1569,2707,2525],{"class":1575},[1569,2709,2542],{"class":1977},[1569,2711,2712],{"class":1575}," },",[1569,2714,2715],{"class":1579}," startAngle",[1569,2717,2525],{"class":1575},[1569,2719,2720],{"class":1977}," 0",[1569,2722,1900],{"class":1575},[1569,2724,2725],{"class":1579}," endAngle",[1569,2727,2525],{"class":1575},[1569,2729,2730],{"class":1977}," 2.83",[1569,2732,2545],{"class":1575},[1569,2734,2735,2737,2739,2741,2743,2745,2747,2749,2751,2753,2755,2757,2759,2761,2763,2765,2767,2769,2771,2773,2775,2778],{"class":1571,"line":1661},[1569,2736,2519],{"class":1575},[1569,2738,2686],{"class":1579},[1569,2740,2525],{"class":1575},[1569,2742,2691],{"class":1575},[1569,2744,2522],{"class":1579},[1569,2746,2525],{"class":1575},[1569,2748,1926],{"class":1575},[1569,2750,2558],{"class":1593},[1569,2752,1862],{"class":1575},[1569,2754,1900],{"class":1575},[1569,2756,2537],{"class":1579},[1569,2758,2525],{"class":1575},[1569,2760,2569],{"class":1977},[1569,2762,2712],{"class":1575},[1569,2764,2715],{"class":1579},[1569,2766,2525],{"class":1575},[1569,2768,2730],{"class":1977},[1569,2770,1900],{"class":1575},[1569,2772,2725],{"class":1579},[1569,2774,2525],{"class":1575},[1569,2776,2777],{"class":1977}," 4.71",[1569,2779,2545],{"class":1575},[1569,2781,2782,2784,2786,2788,2790,2792,2794,2796,2798,2800,2802,2804,2806,2808,2810,2812,2814,2816,2818,2820,2822,2825],{"class":1571,"line":1786},[1569,2783,2519],{"class":1575},[1569,2785,2686],{"class":1579},[1569,2787,2525],{"class":1575},[1569,2789,2691],{"class":1575},[1569,2791,2522],{"class":1579},[1569,2793,2525],{"class":1575},[1569,2795,1926],{"class":1575},[1569,2797,2584],{"class":1593},[1569,2799,1862],{"class":1575},[1569,2801,1900],{"class":1575},[1569,2803,2537],{"class":1579},[1569,2805,2525],{"class":1575},[1569,2807,2595],{"class":1977},[1569,2809,2712],{"class":1575},[1569,2811,2715],{"class":1579},[1569,2813,2525],{"class":1575},[1569,2815,2777],{"class":1977},[1569,2817,1900],{"class":1575},[1569,2819,2725],{"class":1579},[1569,2821,2525],{"class":1575},[1569,2823,2824],{"class":1977}," 6.28",[1569,2826,2545],{"class":1575},[1569,2828,2829],{"class":1571,"line":1820},[1569,2830,2831],{"class":1729},"]\n",[1530,2833,2834],{},"手机占 45/100，就分到一圈的 45%（约 2.83 弧度）——pie 干的就是这个按占比分角度的活。",[1530,2836,2837,2838,2840],{},"第二步，",[1534,2839,2489],{}," 拿到角度后生成扇形路径：",[1560,2842,2844],{"className":1717,"code":2843,"language":1719,"meta":1565,"style":1565},"const arc = d3.arc().innerRadius(0).outerRadius(150); // 内半径 0、外半径 150\n\nconst colors = ['#5470c6', '#91cc75', '#fac858'];\n\nsvg.selectAll('path')\n    .data(pie(data)) // 注意：绑定的是 pie 处理过的角度数据\n    .join('path')\n    .attr('d', arc) // arc 根据每个数据的角度生成扇形\n    .attr('fill', (d, i) => colors[i]);\n",[1534,2845,2846,2891,2895,2935,2939,2958,2975,2992,3014],{"__ignoreMap":1565},[1569,2847,2848,2850,2853,2855,2857,2859,2861,2863,2865,2868,2870,2872,2874,2876,2879,2881,2884,2886,2888],{"class":1571,"line":1572},[1569,2849,1726],{"class":1583},[1569,2851,2852],{"class":1729}," arc ",[1569,2854,1587],{"class":1575},[1569,2856,2620],{"class":1729},[1569,2858,1776],{"class":1575},[1569,2860,2489],{"class":1743},[1569,2862,2627],{"class":1729},[1569,2864,1776],{"class":1575},[1569,2866,2867],{"class":1743},"innerRadius",[1569,2869,1756],{"class":1729},[1569,2871,2124],{"class":1977},[1569,2873,1764],{"class":1729},[1569,2875,1776],{"class":1575},[1569,2877,2878],{"class":1743},"outerRadius",[1569,2880,1756],{"class":1729},[1569,2882,2883],{"class":1977},"150",[1569,2885,1764],{"class":1729},[1569,2887,1814],{"class":1575},[1569,2889,2890],{"class":1782}," // 内半径 0、外半径 150\n",[1569,2892,2893],{"class":1571,"line":1614},[1569,2894,1824],{"emptyLinePlaceholder":1823},[1569,2896,2897,2899,2902,2904,2907,2909,2911,2913,2915,2917,2920,2922,2924,2926,2929,2931,2933],{"class":1571,"line":1661},[1569,2898,1726],{"class":1583},[1569,2900,2901],{"class":1729}," colors ",[1569,2903,1587],{"class":1575},[1569,2905,2906],{"class":1729}," [",[1569,2908,1862],{"class":1575},[1569,2910,1653],{"class":1593},[1569,2912,1862],{"class":1575},[1569,2914,1900],{"class":1575},[1569,2916,1926],{"class":1575},[1569,2918,2919],{"class":1593},"#91cc75",[1569,2921,1862],{"class":1575},[1569,2923,1900],{"class":1575},[1569,2925,1926],{"class":1575},[1569,2927,2928],{"class":1593},"#fac858",[1569,2930,1862],{"class":1575},[1569,2932,2602],{"class":1729},[1569,2934,1983],{"class":1575},[1569,2936,2937],{"class":1571,"line":1786},[1569,2938,1824],{"emptyLinePlaceholder":1823},[1569,2940,2941,2943,2945,2948,2950,2952,2954,2956],{"class":1571,"line":1820},[1569,2942,1580],{"class":1729},[1569,2944,1776],{"class":1575},[1569,2946,2947],{"class":1743},"selectAll",[1569,2949,1756],{"class":1729},[1569,2951,1862],{"class":1575},[1569,2953,1540],{"class":1593},[1569,2955,1862],{"class":1575},[1569,2957,1869],{"class":1729},[1569,2959,2960,2962,2965,2967,2969,2972],{"class":1571,"line":1827},[1569,2961,1740],{"class":1575},[1569,2963,2964],{"class":1743},"data",[1569,2966,1756],{"class":1729},[1569,2968,2485],{"class":1743},[1569,2970,2971],{"class":1729},"(data)) ",[1569,2973,2974],{"class":1782},"// 注意：绑定的是 pie 处理过的角度数据\n",[1569,2976,2977,2979,2982,2984,2986,2988,2990],{"class":1571,"line":2387},[1569,2978,1740],{"class":1575},[1569,2980,2981],{"class":1743},"join",[1569,2983,1756],{"class":1729},[1569,2985,1862],{"class":1575},[1569,2987,1540],{"class":1593},[1569,2989,1862],{"class":1575},[1569,2991,1869],{"class":1729},[1569,2993,2994,2996,2998,3000,3002,3004,3006,3008,3011],{"class":1571,"line":2654},[1569,2995,1740],{"class":1575},[1569,2997,1889],{"class":1743},[1569,2999,1756],{"class":1729},[1569,3001,1862],{"class":1575},[1569,3003,1557],{"class":1593},[1569,3005,1862],{"class":1575},[1569,3007,1900],{"class":1575},[1569,3009,3010],{"class":1729}," arc) ",[1569,3012,3013],{"class":1782},"// arc 根据每个数据的角度生成扇形\n",[1569,3015,3017,3019,3021,3023,3025,3027,3029,3031,3034,3036,3038,3041,3043,3045,3048],{"class":1571,"line":3016},9,[1569,3018,1740],{"class":1575},[1569,3020,1889],{"class":1743},[1569,3022,1756],{"class":1729},[1569,3024,1862],{"class":1575},[1569,3026,1919],{"class":1593},[1569,3028,1862],{"class":1575},[1569,3030,1900],{"class":1575},[1569,3032,3033],{"class":1575}," (",[1569,3035,1557],{"class":1761},[1569,3037,1900],{"class":1575},[1569,3039,3040],{"class":1761}," i",[1569,3042,1764],{"class":1575},[1569,3044,1767],{"class":1583},[1569,3046,3047],{"class":1729}," colors[i])",[1569,3049,1983],{"class":1575},[3051,3052,3053],"tip",{},[1530,3054,3055,3056,3058],{},"想画环形图（甜甜圈图）？把 ",[1534,3057,2867],{}," 从 0 改成 80，中间就镂空了。饼图和环形图只差这一个参数。",[1530,3060,3061],{},"饼图的真实渲染效果：",[3063,3064],"d3-pie-chart",{},[1543,3066],{},[1525,3068,3070],{"id":3069},"小节总结","🧾 小节总结",[3072,3073,3074,3077,3090,3096,3108],"ul",{},[1994,3075,3076],{},"图形生成器是“数据 → path 的 d 属性”的转换函数，复杂图形全靠它。",[1994,3078,3079,3081,3082,3084,3085,3087,3088,2491],{},[1534,3080,1705],{}," 画折线：",[1534,3083,1876],{}," 绑整个数组，记得 ",[1534,3086,2014],{},"，x 轴离散点用 ",[1534,3089,2027],{},[1994,3091,3092,3095],{},[1534,3093,3094],{},".curve(d3.curveMonotoneX)"," 让折线平滑且经过每个数据点。",[1994,3097,3098,3101,3102,3104,3105,3107],{},[1534,3099,3100],{},"d3.area()"," 画面积：",[1534,3103,2285],{}," 下边界固定、",[1534,3106,2289],{}," 上边界随数据。",[1994,3109,3110,3111,3114,3115,3118,3119,3122],{},"饼图 = ",[1534,3112,3113],{},"pie()"," 按占比分角度 + ",[1534,3116,3117],{},"arc()"," 按角度画扇形，",[1534,3120,3121],{},"innerRadius > 0"," 变环形图。",[1543,3124],{},[1525,3126,3128],{"id":3127},"知识问答","❓ 知识问答",[1530,3130,3131],{},[1688,3132,3133],{},"Q1：折线图画出来是黑乎乎一坨，怎么回事？",[1530,3135,3136,3137,3139],{},"忘了设置 ",[1534,3138,2014],{},"。path 默认会填充闭合区域，折线被填成了黑色多边形。",[1530,3141,3142],{},[1688,3143,3144],{},"Q2：饼图的文字标签怎么放？",[1530,3146,3147,3148,3151,3152,3155],{},"用 ",[1534,3149,3150],{},"arc.centroid(d)"," 获取每个扇形的中心点坐标，在该位置添加 ",[1534,3153,3154],{},"text"," 元素即可。",[1530,3157,3158],{},[1688,3159,3160],{},"Q3：curve 有哪些可选值？",[1530,3162,3163,3164,3167,3168,3171,3172,3175,3176,3178],{},"常用的有 ",[1534,3165,3166],{},"curveLinear","（默认直线）、",[1534,3169,3170],{},"curveMonotoneX","（平滑）、",[1534,3173,3174],{},"curveStep","（阶梯）。初学记住 ",[1534,3177,3170],{}," 就够用了。",[1530,3180,3181],{},[1688,3182,3183],{},"Q4：面积图的下边界可以不固定在底部吗？",[1530,3185,3186,3187,3189],{},"可以，",[1534,3188,2285],{}," 也支持传函数，比如堆叠面积图的下边界就是下一层数据的顶部。初学阶段先掌握固定底部即可。",[1543,3191],{},[1525,3193,3195],{"id":3194},"小练习","🧪 小练习",[1530,3197,3198],{},"基于一周销量数据完成一个“折线 + 面积”组合图：",[1991,3200,3201,3210,3215],{},[1994,3202,3147,3203,3205,3206,3209],{},[1534,3204,2027],{}," 创建 x 轴比例尺，",[1534,3207,3208],{},"scaleLinear"," 创建 y 轴比例尺。",[1994,3211,3147,3212,3214],{},[1534,3213,3100],{}," 画一个半透明的面积图。",[1994,3216,3147,3217,3219,3220,3222],{},[1534,3218,1705],{}," 加 ",[1534,3221,3170],{}," 在上面叠一条平滑折线。",[1560,3224,3226],{"className":1717,"code":3225,"language":1719,"meta":1565,"style":1565},"const data = [\n    { day: '周一', value: 120 },\n    { day: '周二', value: 200 },\n    { day: '周三', value: 150 },\n    { day: '周四', value: 80 },\n    { day: '周五', value: 70 },\n];\n\nonMounted(() => {\n    // 请在这里编写代码\n});\n",[1534,3227,3228,3238,3264,3289,3314,3339,3364,3370,3374,3388,3394],{"__ignoreMap":1565},[1569,3229,3230,3232,3234,3236],{"class":1571,"line":1572},[1569,3231,1726],{"class":1583},[1569,3233,2509],{"class":1729},[1569,3235,1587],{"class":1575},[1569,3237,2514],{"class":1729},[1569,3239,3240,3242,3245,3247,3249,3251,3253,3255,3257,3259,3262],{"class":1571,"line":1614},[1569,3241,2519],{"class":1575},[1569,3243,3244],{"class":1579}," day",[1569,3246,2525],{"class":1575},[1569,3248,1926],{"class":1575},[1569,3250,2071],{"class":1593},[1569,3252,1862],{"class":1575},[1569,3254,1900],{"class":1575},[1569,3256,2537],{"class":1579},[1569,3258,2525],{"class":1575},[1569,3260,3261],{"class":1977}," 120",[1569,3263,2545],{"class":1575},[1569,3265,3266,3268,3270,3272,3274,3276,3278,3280,3282,3284,3287],{"class":1571,"line":1661},[1569,3267,2519],{"class":1575},[1569,3269,3244],{"class":1579},[1569,3271,2525],{"class":1575},[1569,3273,1926],{"class":1575},[1569,3275,2080],{"class":1593},[1569,3277,1862],{"class":1575},[1569,3279,1900],{"class":1575},[1569,3281,2537],{"class":1579},[1569,3283,2525],{"class":1575},[1569,3285,3286],{"class":1977}," 200",[1569,3288,2545],{"class":1575},[1569,3290,3291,3293,3295,3297,3299,3301,3303,3305,3307,3309,3312],{"class":1571,"line":1786},[1569,3292,2519],{"class":1575},[1569,3294,3244],{"class":1579},[1569,3296,2525],{"class":1575},[1569,3298,1926],{"class":1575},[1569,3300,2089],{"class":1593},[1569,3302,1862],{"class":1575},[1569,3304,1900],{"class":1575},[1569,3306,2537],{"class":1579},[1569,3308,2525],{"class":1575},[1569,3310,3311],{"class":1977}," 150",[1569,3313,2545],{"class":1575},[1569,3315,3316,3318,3320,3322,3324,3326,3328,3330,3332,3334,3337],{"class":1571,"line":1820},[1569,3317,2519],{"class":1575},[1569,3319,3244],{"class":1579},[1569,3321,2525],{"class":1575},[1569,3323,1926],{"class":1575},[1569,3325,2098],{"class":1593},[1569,3327,1862],{"class":1575},[1569,3329,1900],{"class":1575},[1569,3331,2537],{"class":1579},[1569,3333,2525],{"class":1575},[1569,3335,3336],{"class":1977}," 80",[1569,3338,2545],{"class":1575},[1569,3340,3341,3343,3345,3347,3349,3351,3353,3355,3357,3359,3362],{"class":1571,"line":1827},[1569,3342,2519],{"class":1575},[1569,3344,3244],{"class":1579},[1569,3346,2525],{"class":1575},[1569,3348,1926],{"class":1575},[1569,3350,2107],{"class":1593},[1569,3352,1862],{"class":1575},[1569,3354,1900],{"class":1575},[1569,3356,2537],{"class":1579},[1569,3358,2525],{"class":1575},[1569,3360,3361],{"class":1977}," 70",[1569,3363,2545],{"class":1575},[1569,3365,3366,3368],{"class":1571,"line":2387},[1569,3367,2602],{"class":1729},[1569,3369,1983],{"class":1575},[1569,3371,3372],{"class":1571,"line":2654},[1569,3373,1824],{"emptyLinePlaceholder":1823},[1569,3375,3376,3379,3381,3383,3385],{"class":1571,"line":3016},[1569,3377,3378],{"class":1743},"onMounted",[1569,3380,1756],{"class":1729},[1569,3382,2627],{"class":1575},[1569,3384,1767],{"class":1583},[1569,3386,3387],{"class":1575}," {\n",[1569,3389,3391],{"class":1571,"line":3390},10,[1569,3392,3393],{"class":1782},"    // 请在这里编写代码\n",[1569,3395,3397,3400,3402],{"class":1571,"line":3396},11,[1569,3398,3399],{"class":1575},"}",[1569,3401,1764],{"class":1729},[1569,3403,1983],{"class":1575},[1543,3405],{},[1530,3407,3408],{},"🎉 恭喜你已经掌握三大图形生成器！下一篇我们给图表加上过渡动画，让数据“动”起来。",[3410,3411,3412],"style",{},"html pre.shiki code .s86vT, html code.shiki .s86vT{--shiki-light:#39ADB5;--shiki-default:#89DDFF;--shiki-dark:#89DDFF}html pre.shiki code .sd2Uz, html code.shiki .sd2Uz{--shiki-light:#E53935;--shiki-default:#F07178;--shiki-dark:#F07178}html pre.shiki code .s50WR, html code.shiki .s50WR{--shiki-light:#9C3EDA;--shiki-default:#C792EA;--shiki-dark:#C792EA}html pre.shiki code .sIEYB, html code.shiki .sIEYB{--shiki-light:#91B859;--shiki-default:#C3E88D;--shiki-dark:#C3E88D}html .light .shiki span {color: var(--shiki-light);background: var(--shiki-light-bg);font-style: var(--shiki-light-font-style);font-weight: 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