{"id":5404,"date":"2016-06-02T00:34:45","date_gmt":"2016-06-01T16:34:45","guid":{"rendered":"http:\/\/www.zhangxinxu.com\/wordpress\/?p=5404"},"modified":"2016-06-02T00:40:39","modified_gmt":"2016-06-01T16:40:39","slug":"canvas-star-noise-smoke","status":"publish","type":"post","link":"https:\/\/www.zhangxinxu.com\/wordpress\/2016\/06\/canvas-star-noise-smoke\/","title":{"rendered":"canvas\u56fe\u5f62\u7ed8\u5236\u4e4b\u661f\u7a7a\u3001\u566a\u70b9\u4e0e\u70df\u96fe\u6548\u679c"},"content":{"rendered":"

by zhangxinxu<\/a> from http:\/\/www.zhangxinxu.com<\/a>
\n\u672c\u6587\u5730\u5740\uff1ahttp:\/\/www.zhangxinxu.com\/wordpress\/?p=5404<\/a><\/p>\n

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\u4e8c\u3001canvas\u56fe\u5f62\u6548\u679c\u4e4b\u65cb\u8f6c\u661f\u7a7a<\/h3>\n

\"\u65cb\u8f6c\u661f\u7a7a\u6548\u679c\u622a\u56fe\"<\/p>\n

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    \n
  1. \u5148\u753b\u4e00\u4e2a\u4f4d\u7f6e\u900f\u660e\u5ea6\u968f\u673a\u7684\u9759\u6001\u7684\u661f\u661f\u5b9e\u4f8b\u5bf9\u8c61\uff1b<\/li>\n
  2. \u6709\u4e00\u4e2a\u53ef\u4ee5\u6539\u53d8\u661f\u661f\u4f4d\u7f6e\u548c\u900f\u660e\u5ea6\u7684draw\u65b9\u6cd5\uff1b<\/li>\n
  3. \u5b9a\u65f6\u5668\u8dd1\u8d77\u6765\uff0c\u753b\u5e03\u4e0d\u505c\u5730\u6e05\u9664\u4e0e\u7ed8\u5236\uff0c\u52a8\u753b\u6548\u679c\u5b8c\u6210\uff01<\/li>\n<\/ol>\n

    \u539f\u7406\u5f88\u7b80\u5355\u3002<\/p>\n

    \u672c\u4f8b\u5b50\u5b9e\u73b0\u76842\u4e2a\u96be\u70b9\u5728\u4e8e\uff1a<\/p>\n

      \n
    1. \u6708\u660e\u661f\u7a00<\/strong>
      \n\u661f\u661f\u5782\u76f4\u65b9\u5411\u5b9e\u9645\u4e0a\u662f\u4e2a\u4f2a\u968f\u673a\uff0c\u8d8a\u9760\u8fd1\u5730\u7403\uff0c\u661f\u661f\u8d8a\u5bc6\u96c6\uff0c\u800c\u8d8a\u5f80\u4e0a\uff0c\u8d8a\u7a00\u758f\u3002\u5176\u7b97\u6cd5\u5982\u4e0b\uff1a<\/p>\n
      \n
      var getMinRandom = function() {\n    var rand = Math.random();\n    \/\/ step\u7684\u5927\u5c0f\u51b3\u5b9a\u4e86\u661f\u661f\u9760\u8fd1\u5730\u7403\u7684\u805a\u62e2\u7a0b\u5ea6\uff0c\n    \/\/ step = Math.ceil(2 \/ (1 - rand))\u5c31\u805a\u62e2\u5f88\u660e\u663e\n    var step = Math.ceil(1 \/ (1 - rand));<\/span>\n    var arr = [];\n    for (var i=0; i<step; i++) {\n        arr.push(Math.random());\n    }\n\n    return Math.min.apply(null, arr);       \n};<\/pre>\n<\/div>\n
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    2. \u5706\u5f27\u8f68\u8ff9<\/strong>
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      \u8fd9\u4e0b\u9898\u76ee\u5c31\u7b80\u5355\u4e86\uff0c\u5df2\u77e5a,b, \u6c42y\u76f8\u5bf9\u4e8ex\u7684\u51fd\u6570\u8868\u8fbe\u5f0f\u2026\u2026<\/li>\n<\/ol>\n
      \u4e09\u3001canvas\u56fe\u5f62\u6548\u679c\u4e4b\u96ea\u82b1\u566a\u70b9\u6548\u679c<\/h3>\n
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      \u8fd9\u5c31\u662f\u672c\u4f8b\u5b50\u5b9e\u73b0\u7684\u96be\u70b9\uff1a<\/p>\n
        \n
      1. \u6570\u91cf\u4e0e\u6027\u80fd<\/strong>
        \n\u6211\u8fd9\u91cc\u662f\u8fd9\u4e48\u5904\u7406\u7684\uff0c\u867d\u7136\u6700\u7ec8\u7684\u566a\u70b9\u5927\u5c0f\u662f1920*500\uff0c\u4f46\u662f\uff0c\u6211\u4eec\u5b9e\u9645\u4e0a\u662f\u7531N\u5757300*150\u7684\u5c0f\u7684\u50cf\u74f7\u7816\u4e00\u6837\u7684\u5c0f\u65b9\u5757\u62fc\u8d77\u6765\u7684\u3002\u8bdd\u53e5\u8bdd\u8bf4\uff0c\u6211\u5b9e\u9645\u53ea\u7ed8\u5236\u4e8645000\u4e2a\u70b9\uff0c\u6bd4960000\u663e\u7136\u8981\u5c0f\u4e8620\u500d\u8fd8\u4e0d\u6b62\u3002<\/p>\n
        \u8fd9\u6837\uff0c\u65e2\u6ee1\u8db3\u4e86\u6548\u679c\uff0c\u53c8\u4fdd\u8bc1\u4e86\u6027\u80fd\u3002<\/li>\n<\/ol>\n
        \u5177\u4f53\u5b9e\u73b0\u539f\u7406\u4e3a\uff1a<\/p>\n
          \n
        1. \u521b\u5efa\u4e00\u4e2acanvas\uff0c\u7ed8\u5236\u4e00\u4e2a300*150\u968f\u673a\u566a\u70b9\u56fe\u5f62\uff1b<\/li>\n
        2. \u628a\u8fd9\u91cc\u5177\u6709\u566a\u70b9\u7684canvas\u4ee5\u753b\u5e03\u5f62\u5f0f\u5728\u7ed8\u5236\u5230\u9875\u9762\u4e0a\u7684\u5927canvas\u4e0a\uff1b<\/li>\n<\/ol>\n
          \u8bf4\u5f97canvas\u7ed8\u56fe\uff0c\u4e0d\u5f97\u4e0d\u63d0\u4e00\u4e0b\u975e\u5e38\u5e38\u7528\u7684\u4e00\u4e2adrawImage()<\/code>\u65b9\u6cd5\uff0c\u8bed\u6cd5\u5982\u4e0b\uff1a<\/p>\n
          \n
          context.drawImage(img,sx,sy,swidth,sheight,x,y,width,height);<\/pre>\n<\/div>\n
          \u5404\u4e2a\u53c2\u6570\u793a\u610f\u4e3a\uff08\u7f51\u4e0a\u7684\u63cf\u8ff0\u90fd\u662f\u76f4\u8bd1\uff0c\u5f88\u751f\u6da9\uff0c\u6211\u8fd9\u91cc\u91cd\u65b0\u9648\u8ff0\u4e86\u4e0b\uff09\uff1a<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n
          \u53c2\u6570<\/th>\n\u63cf\u8ff0<\/th>\n<\/tr>\n
          img<\/i><\/td>\n\u7528\u6765\u88ab\u7ed8\u5236\u7684\u56fe\u50cf\u3001\u753b\u5e03\u6216\u89c6\u9891\u3002<\/td>\n<\/tr>\n
          sx<\/i><\/td>\n\u53ef\u9009\u3002img\u88ab\u7ed8\u5236\u533a\u57df\u7684\u8d77\u59cb\u5de6\u4e0ax\u5750\u6807\u3002<\/td>\n<\/tr>\n
          sy<\/i><\/td>\n\u53ef\u9009\u3002img\u88ab\u7ed8\u5236\u533a\u57df\u7684\u8d77\u59cb\u5de6\u4e0ay\u5750\u6807\u3002<\/td>\n<\/tr>\n
          swidth<\/i><\/td>\n\u53ef\u9009\u3002img\u88ab\u7ed8\u5236\u533a\u57df\u7684\u5bbd\u5ea6\u3002<\/td>\n<\/tr>\n
          sheight<\/i><\/td>\n\u53ef\u9009\u3002img\u88ab\u7ed8\u5236\u533a\u57df\u7684\u9ad8\u5ea6\u3002<\/td>\n<\/tr>\n
          x<\/i><\/td>\n\u753b\u5e03\u4e0a\u653e\u7f6eimg\u7684\u8d77\u59cbx\u5750\u6807\u3002<\/td>\n<\/tr>\n
          y<\/i><\/td>\n\u753b\u5e03\u4e0a\u653e\u7f6eimg\u7684\u8d77\u59cby\u5750\u6807\u3002<\/td>\n<\/tr>\n
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            \n
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            canvas\u8fd8\u652f\u63013D\u6548\u679c\uff0c\u4e5f\u5c31\u662fwebGL, \u4ea6\u79f03D Canvas graphics, IE11+\u652f\u6301\uff0c\u76ee\u524dAndroid 4.*\u4efb\u610f\u7248\u672c\u90fd\u8fd8\u4e0d\u652f\u6301\uff0c\u4e1a\u5185\u8457\u540d\u7684\u76f8\u5173\u5e93\u5c31\u662fthreejs\u4e86\u3002<\/p>\n
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