{"id":131,"date":"2009-06-06T23:59:12","date_gmt":"2009-06-06T15:59:12","guid":{"rendered":"http:\/\/leegorous.net\/blog\/?p=131"},"modified":"2012-03-03T20:38:14","modified_gmt":"2012-03-03T12:38:14","slug":"bezier-curve-in-canvas","status":"publish","type":"post","link":"http:\/\/leegorous.net\/blog\/2009\/06\/06\/bezier-curve-in-canvas\/","title":{"rendered":"\u7ed8\u5236\u8d1d\u585e\u5c14\u66f2\u7ebf"},"content":{"rendered":"<p><figure style=\"width: 220px\" class=\"wp-caption alignright\"><img loading=\"lazy\" alt=\"Bezier Curve in Canvas\" src=\"http:\/\/farm4.static.flickr.com\/3608\/3616755492_9e5755c7ee_m.jpg\" title=\"Bezier Curve in Canvas\" width=\"220\" height=\"220\" \/><figcaption class=\"wp-caption-text\">Bezier Curve in Canvas<\/figcaption><\/figure><br \/>\n\u53ea\u662f\u9760\u76f4\u7ebf\u548c\u5f27\u7ebf\u6765\u753b\u56fe\u662f\u4e0d\u591f\u7684\uff0c\u9762\u5bf9\u4e00\u4e9b\u66f4\u52a0\u590d\u6742\u4f46\u662f<strong>\u6709\u89c4\u5f8b<\/strong>\u7684\u56fe\u5f62\u65f6\uff0c\u6211\u4eec\u9700\u8981\u53e6\u5916\u4e00\u4e2a\u66f4\u52a0\u5f3a\u800c\u6709\u529b\u7684\u5de5\u5177\u2014\u2014<a href=\"http:\/\/zh.wikipedia.org\/wiki\/%E8%B2%9D%E8%8C%B2%E6%9B%B2%E7%B7%9A\" title=\"\u66f4\u52a0\u8be6\u7ec6\u7684\u8d1d\u585e\u5c14\u66f2\u7ebf\u8d44\u6599\uff0c\u4f46\u53ef\u80fd\u5728\u56fd\u5185\u8bbf\u95ee\u65f6\u4f1a\u53d7\u963b\">\u8d1d\u585e\u5c14\u66f2\u7ebf<\/a>\u3002<\/p>\n<p>\u5728 canvas \u91cc\uff0c\u8d1d\u585e\u5c14\u66f2\u7ebf\u6709\u4e8c\u6b21\u65b9\u548c\u4e09\u6b21\u65b9\u4e24\u79cd\u5f62\u5f0f\uff0c\u533a\u522b\u5c31\u5728\u4e8e\u63a7\u5236\u70b9\u7684\u6570\u76ee\uff0c\u4e8c\u6b21\u65b9\u7684\u53ea\u6709\u4e00\u4e2a\u63a7\u5236\u70b9\uff0c\u800c\u4e09\u6b21\u65b9\u7684\u5219\u6709\u4e24\u4e2a\u3002<\/p>\n<pre name=\"code\" class=\"brush: js\">\r\nquadraticCurveTo(cp1x, cp1y, x, y)\r\nbezierCurveTo(cp1x, cp1y, cp2x, cp2y, x, y)\r\n<\/pre>\n<p>\u8fd9\u91cc\u7684\u8d1d\u585e\u5c14\u66f2\u7ebf\u7684\u7528\u6cd5\u540c\u6837\u7684\u5f88\u7b80\u5355\u7684\uff0c\u4f46\u662f\u5374\u4e0d\u50cf\u5728 Photoshop \u6216\u8005 Illustrator \u91cc\u753b\u66f2\u7ebf\u90a3\u4e48\u8f7b\u5de7\u4e86\uff0c\u5b83\u662f\u975e\u5e38\u9700\u8981\u89e6\u89c9\u548c\u8010\u5fc3\u7684\u3002\u6240\u4ee5\u4e0a\u9762\u5f3a\u8c03\u4e86\u6709\u89c4\u5f8b\u8fd9\u4e2a\u5173\u952e\u8bcd\u3002<br \/>\n\u5b9e\u9645\u4e0a\u662f\u4ec0\u4e48\u611f\u89c9\uff0c\u5927\u5bb6\u4eb2\u8eab\u4f53\u9a8c\u5427\uff0c\u770b\u770b\u4e0b\u9762\u7684\u793a\u4f8b\u3002<\/p>\n<pre name=\"code\" class=\"brush: js\">\r\nvar colors = [&quot;ec460c&quot;, &quot;1e951e&quot;, &quot;2692f7&quot;, &quot;ea62f6&quot;];\r\nvar cp1 = 60;\r\nvar cp2 = 160;\r\nvar y1 = 150;\r\n\r\nfor (var i=0; i&lt; colors.length; i++) {\r\n\tctx.beginPath();\r\n\tctx.moveTo(25,75);\r\n\tctx.bezierCurveTo(85,75,cp1,y1,100,y1);\r\n\tctx.bezierCurveTo(cp2,y1,120,35,190,35);\r\n\r\n\tcp1 -= 10;  \/\/ \u4f7f\u63a7\u5236\u70b9 1 \u6a2a\u5750\u6807\u5de6\u79fb 10 \u50cf\u7d20\r\n\tcp2 += 10;  \/\/ \u4f7f\u63a7\u5236\u70b9 2 \u6a2a\u5750\u6807\u53f3\u79fb 10 \u50cf\u7d20\r\n\ty1 += 20;    \/\/ \u662f\u66f2\u7ebf\u4f4e\u70b9\u4e0b\u964d 20 \u50cf\u7d20\r\n\r\n\tctx.strokeStyle = &quot;#&quot; + colors[i];\r\n\t\/\/ \u8bbe\u7f6e\u7ebf\u6761\u989c\u8272\r\n\tctx.stroke();\r\n}\r\n<\/pre>\n<p>\u5982\u56fe\uff0c\u6211\u6bd4\u8f83\u61d2\uff0c\u91cc\u9762\u7528\u4e86\u5faa\u73af\u753b\u4e86\u51e0\u6761\u66f2\u7ebf\uff0c\u4e00\u9635\u989c\u8272\u4e00\u6761\uff0c\u4e0d\u540c\u5728\u4e8e\u66f2\u7ebf\u7684\u5e95\u7aef\u4f4d\u7f6e\u4e0e\u66f2\u7ebf\u53e3\u5f84\u7684\u4e0d\u540c\u3002<br \/>\n\u4f60\u89c9\u5f97\u50cf\u4e2a\u4ec0\u4e48\u5462\uff1f<\/p>\n<p>\u8fd9\u91cc\u5e76\u6ca1\u6709\u7528\u5230\u4e8c\u6b21\u65b9\u5f62\u5f0f\u7684\u8d1d\u585e\u5c14\u66f2\u7ebf\uff0c\u4f46\u662f\u4e09\u6b21\u65b9\u7684\u90fd\u4f1a\u7528\u4e86\uff0c\u4e8c\u6b21\u65b9\u7684\u8fd8\u4e0d\u884c\u5417\uff1f<\/p>\n<p><em>PS: <\/em>\u4ee5\u4e0a\u4ee3\u7801\u662f\u4e3b\u4f53\u90e8\u5206\uff0c\u8981\u8fd0\u884c\u4e0a\u9762\u7684\u4f8b\u5b50\uff0c\u8bf7\u53c2\u8003 <a href=\"http:\/\/leegorous.net\/blog\/2009\/03\/20\/intro-to-canvas\/\">\u8fdb\u9a7bCanvas<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u53ea\u662f\u9760\u76f4\u7ebf\u548c\u5f27\u7ebf\u6765\u753b\u56fe\u662f\u4e0d\u591f\u7684\uff0c\u9762\u5bf9\u4e00\u4e9b\u66f4\u52a0\u590d\u6742\u4f46\u662f\u6709\u89c4\u5f8b\u7684\u56fe\u5f62\u65f6\uff0c\u6211\u4eec\u9700\u8981\u53e6\u5916\u4e00\u4e2a\u66f4\u52a0\u5f3a\u800c\u6709\u529b\u7684\u5de5\u5177\u2014\u2014\u8d1d\u585e &hellip; <\/p>\n<p class=\"link-more\"><a href=\"http:\/\/leegorous.net\/blog\/2009\/06\/06\/bezier-curve-in-canvas\/\" class=\"more-link\">\u7ee7\u7eed\u9605\u8bfb<span class=\"screen-reader-text\">\u201c\u7ed8\u5236\u8d1d\u585e\u5c14\u66f2\u7ebf\u201d<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[3],"tags":[5,9],"_links":{"self":[{"href":"http:\/\/leegorous.net\/blog\/wp-json\/wp\/v2\/posts\/131"}],"collection":[{"href":"http:\/\/leegorous.net\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/leegorous.net\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/leegorous.net\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/leegorous.net\/blog\/wp-json\/wp\/v2\/comments?post=131"}],"version-history":[{"count":12,"href":"http:\/\/leegorous.net\/blog\/wp-json\/wp\/v2\/posts\/131\/revisions"}],"predecessor-version":[{"id":1074,"href":"http:\/\/leegorous.net\/blog\/wp-json\/wp\/v2\/posts\/131\/revisions\/1074"}],"wp:attachment":[{"href":"http:\/\/leegorous.net\/blog\/wp-json\/wp\/v2\/media?parent=131"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/leegorous.net\/blog\/wp-json\/wp\/v2\/categories?post=131"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/leegorous.net\/blog\/wp-json\/wp\/v2\/tags?post=131"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}