html5 canvas bezierCurveTo涉及4個(gè)點(diǎn):o(開始點(diǎn)),cp1(控制點(diǎn)1),cp2(控制點(diǎn)2),p(結(jié)束點(diǎn))當(dāng) o到p的走向(向量op)和cp1到cp2的走向(向量c12)相反時(shí)
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