🐉 生成四角龙曲线Generate Quaddragon Curve
生成四角龙（90° 龙的变体走法）。导出 PNG。可设置「宽度」、「高度」、「边距」、「线宽」、「迭代次数」。Generate a quaddragon (90° dragon-style variant). Export PNG. Settings: Width, Height, Padding, Line width, Iterations.
使用说明与常见问题How-to & FAQ
「生成四角龙曲线」是什么？What is the Generate Quaddragon Curve tool?
生成四角龙（90° 龙的变体走法）。导出 PNG。可设置「宽度」、「高度」、「边距」、「线宽」、「迭代次数」。Generate a quaddragon (90° dragon-style variant). Export PNG. Settings: Width, Height, Padding, Line width, Iterations.
如何使用「生成四角龙曲线」？How do I use the Generate Quaddragon Curve tool?
在「生成四角龙曲线」中，按需设置「宽度」、「高度」、「边距」、「线宽」、「迭代次数」等选项，然后点击「绘制」、「下载 PNG」按钮即可。In the Generate Quaddragon Curve: Set "Width", "Height", "Padding", "Line width", "Iterations", then click "Draw", "Download PNG".
四角龙是什么？What is the quaddragon?
把四条相同的海威龙曲线从同一个起点出发，分别朝四个方向（每条旋转 90°）展开。四条龙曲线互不重叠，边从不重复，迭代越多越像一块从中心向外铺开的四叶图案；无限迭代时四条龙恰好可以铺满整个平面。Four identical Heighway dragon curves start from the same point and unfold in four directions, each rotated 90°. The four curves never overlap or share an edge; with more iterations they form a four-armed pattern spreading from the centre, and in the limit four dragons around a point tile the whole plane.
规则和迭代上限？Rule and iteration limit?
每条龙都用 L 系统 X → X+YF+、Y → -FX-Y，起始 FX，转角 90°。每条有 2^n 段，14 次（上限）共 4 × 16384 段。Each dragon uses the L-system X → X+YF+, Y → -FX-Y from FX with 90° turns. Each has 2^n segments, so the maximum 14 iterations draws 4 × 16,384 segments.
有哪些选项可以调整？What options can I adjust?
「生成四角龙曲线」的设置：「宽度」默认 512，范围 64–2048；「高度」默认 512，范围 64–2048；「边距」默认 20，范围 0–256；「线宽」默认 2，范围 0.5–40；「迭代次数」默认 10，范围 1–14；「背景」默认 #ffffff；「线条」默认 #1e3a8a。每次生成结果都按当前设置处理。Settings in the Generate Quaddragon Curve — "Width" default 512, range 64–2048; "Height" default 512, range 64–2048; "Padding" default 20, range 0–256; "Line width" default 2, range 0.5–40; "Iterations" default 10, range 1–14; "Background" default #ffffff; "Line" default #1e3a8a. The result always uses the current settings.
「生成四角龙曲线」免费吗？需要注册吗？Is the Generate Quaddragon Curve free? Do I need an account?
「生成四角龙曲线」完全免费，无需注册或安装，打开网页即可使用，手机和电脑都能用；输入的内容只在你的浏览器本地处理。The Generate Quaddragon Curve is completely free with no sign-up or install and works on phones and desktops; what you enter is processed only in your browser.