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flykhan
2026-05-03 11:47:30 +08:00
commit 1ff86b66fc
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images/rotation.svg
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<svg width="200" height="200" xmlns="http://www.w3.org/2000/svg">
<defs>
<marker id="rot-arr" markerWidth="7" markerHeight="5" refX="7" refY="2.5" orient="auto">
<path d="M0,0 L7,2.5 L0,5" fill="#999"/>
</marker>
<marker id="rot-r" markerWidth="7" markerHeight="5" refX="7" refY="2.5" orient="auto">
<path d="M0,0 L7,2.5 L0,5" fill="#e74c3c"/>
</marker>
<marker id="rot-b" markerWidth="7" markerHeight="5" refX="7" refY="2.5" orient="auto">
<path d="M0,0 L7,2.5 L0,5" fill="#3498db"/>
</marker>
</defs>
<!-- axes -->
<line x1="20" y1="180" x2="190" y2="180" stroke="#ccc" stroke-width="1" marker-end="url(#rot-arr)"/>
<line x1="20" y1="180" x2="20" y2="10" stroke="#ccc" stroke-width="1" marker-end="url(#rot-arr)"/>
<circle cx="20" cy="180" r="3" fill="#333"/>
<!-- original vector along x -->
<line x1="20" y1="180" x2="160" y2="180" stroke="#e74c3c" stroke-width="2.5" marker-end="url(#rot-r)"/>
<text x="140" y="175" fill="#e74c3c" font-size="11">v</text>
<!-- rotated vector (60 degrees) -->
<line x1="20" y1="180" x2="90" y2="59" stroke="#3498db" stroke-width="2.5" marker-end="url(#rot-b)"/>
<text x="68" y="65" fill="#3498db" font-size="11">Rv</text>
<!-- arc showing angle -->
<path d="M 70,180 A 50,50 0 0,0 45,137" fill="none" stroke="#666" stroke-width="1.2" stroke-dasharray="3"/>
<text x="62" y="155" fill="#666" font-size="11">θ</text>
<text x="100" y="14" text-anchor="middle" fill="#333" font-size="11">same length, new direction</text>
</svg>
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