1. root\u30aa\u30b8\u30a7\u30af\u30c8\u306e\u5b9a\u7fa9<\/p>\n
\r\nroot = {\r\n \/\/ context\r\n \"ctx\":null,\r\n\r\n \/\/ ccanvas\u306e\u521d\u671f\u5316\r\n \"init\":function () {\r\n var cnvs = document.getElementById('canvas');\r\n this.ctx = cnvs.getContext('2d');\r\n },\r\n\r\n \/\/ \u63cf\u753b\u51e6\u7406\r\n \"draw\":function (x, y, cnvBold, cnvColor ) {\r\n this.ctx.lineWidth = cnvBold;\r\n this.ctx.strokeStyle = 'rgba('+cnvColor+')';\r\n \/\/ \u521d\u56de\u51e6\u7406\u306e\u5224\u5b9a\r\n if (globalThis.clickFlg == \"1\") {\r\n globalThis.clickFlg = \"2\";\r\n this.ctx.beginPath();\r\n this.ctx.lineCap = \"round\"; \/\/\u3000\u7dda\u3092\u89d2\u4e38\u306b\u3059\u308b\r\n this.ctx.moveTo(x, y);\r\n } else {\r\n this.ctx.lineTo(x, y);\r\n }\r\n this.ctx.stroke();\r\n },\r\n\r\n \/\/ canvas\u306e\u80cc\u666f\u8272\u3092\u8a2d\u5b9a(\u6307\u5b9a\u304c\u306a\u3044\u5834\u5408\u306bjpeg\u4fdd\u5b58\u3059\u308b\u3068\u80cc\u666f\u304c\u9ed2\u306b\u306a\u308b)\r\n \"setBgColor\":function( bgColor){\r\n const cnvWidth = 500;\r\n const cnvHeight = 500;\r\n\r\n this.ctx.fillStyle = bgColor;\r\n this.ctx.fillRect(0,0,cnvWidth,cnvHeight);\r\n }\r\n};\r\n<\/pre>\n1.1 JSON\u30aa\u30d6\u30b8\u30a7\u30af\u306b\u3088\u308b\u5b9a\u7fa9<\/p>\n
\r\n\u3000root:{\r\n\u3000\u3000\u3000\u3000\"ctx\":null,\r\n\u3000\u3000\u3000\u3000\"init\":function () {\u3000...\u3000}\r\n \"draw\":function (x, y, cnvBold, cnvColor ) { ...\u3000}\r\n \"setBgColor\":function( bgColor){ ...\u3000}\r\n };\r\n<\/pre>\n\u3000JSON\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u30ea\u30c6\u30e9\u30eb\u306e\u8a18\u6cd5\u3092\u57fa\u306b\u3057\u3066\u3044\u308b
\n \u30fb\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u30ea\u30c6\u30e9\u30eb\u306e\u4e2d\u306b\u306f\u3001\u6570\u5024\u30ea\u30c6\u30e9\u30eb\u3001\u6587\u5b57\u30ea\u30c6\u30e9\u30eb\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u30ea\u30c6\u30e9\u30eb\u3001\u914d\u5217\u30ea\u30c6\u30e9\u30eb\u3001\u95a2\u6570\u30ea\u30c6\u30e9\u30eb\u3001\u6b63\u898f\u8868\u73fe\u30ea\u30c6\u30e9\u30eb\u304c\u6301\u3066\u308b
\n \u30fbJSON\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306f\u3000JSON\u6587\u5b57\u5217\u3068JSON\u5024\u304b\u3089\u6210\u308b
\n \u30fbJSON\u5024\u306e\u4e2d\u306b\u306f\u3001JSON\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3001JSON\u914d\u5217\u3001JSON\u6587\u5b57\u5217\u3001JSON\u6570\u5024\u3001\u306e\u307b\u304btrue,false,null\u304c\u6301\u3066\u308b<\/p>\n
1.2 globalThis.clickFlg
\n \u95a2\u6570\u5185\u306a\u306e\u3067\u3001\u30b0\u30eb\u30fc\u30d0\u30eb\u5909\u6570\u3067\u3042\u308b\u3053\u3068\u3092\u660e\u793a\u7684\u306b\u3059\u308b<\/p>\n
1.3 this.ctx
\n this.ctx \u306f\u3000root.ctx\u3068\u540c\u4e00<\/p>\n
1.4 this.ctx.lineWidth, this.ctx.strokeStyle
\n\u3000this.ctx.lineWidth = cnvBold;
\n\u3000this.ctx.strokeStyle = ‘rgba(‘+cnvColor+’)’;
\n JavaScript\u3067\u306f\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u30d7\u30ed\u30d1\u30c6\u30a3\u304c\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u306a\u304f\u3066\u3082\u3001\u4ee3\u5165\u53ef\u80fd
\n \u30fb\u65b0\u305f\u306a\u30d7\u30ed\u30d1\u30c6\u30a3\u304c\u4ee3\u5165\u6642\u306b\u751f\u6210\u3055\u308c\u308b<\/p>\n
2.\u521d\u671f\u5316\u30d7\u30ed\u30b0\u30e9\u30e0init()
\n2.1 \u521d\u671f\u5316\u30d7\u30ed\u30b0\u30e9\u30e0init()\u306efunction\u5b9a\u7fa9<\/p>\n
\r\nfunction init () {\r\n \/\/ canvas\r\n\r\n globalThis.clickFlg = 0; \/\/ \u30af\u30ea\u30c3\u30af\u4e2d\u306e\u5224\u5b9a 1:\u30af\u30ea\u30c3\u30af\u958b\u59cb 2:\u30af\u30ea\u30c3\u30af\u4e2d\r\n \/\/ \u5909\u6570\u5ba3\u8a00\r\n var cnvColor = \"255, 0, 0, 1\"; \/\/ \u7dda\u306e\u8272\r\n var cnvBold = 5; \/\/ \u7dda\u306e\u592a\u3055\r\n var bgColor = \"rgb(255,255,255)\";\r\n\r\n \/\/ canvas\u306e\u80cc\u666f\u8272\u3092\u8a2d\u5b9a(\u6307\u5b9a\u304c\u306a\u3044\u5834\u5408\u306bjpeg\u4fdd\u5b58\u3059\u308b\u3068\u80cc\u666f\u304c\u9ed2\u306b\u306a\u308b)\r\n root.init();\r\n root.setBgColor(bgColor);\r\n\r\n\r\n\r\n \/\/ canvas\u4e0a\u3067\u306e\u30a4\u30d9\u30f3\u30c8\r\n $(\"#canvas\").mousedown(function(){\r\n globalThis.clickFlg = 1; \/\/ \u30de\u30a6\u30b9\u62bc\u4e0b\u958b\u59cb\r\n }).mouseup(function(){\r\n globalThis.clickFlg = 0; \/\/ \u30de\u30a6\u30b9\u62bc\u4e0b\u7d42\u4e86\r\n }).mousemove(function(e){\r\n \/\/ \u30de\u30a6\u30b9\u79fb\u52d5\u51e6\u7406\r\n if(!globalThis.clickFlg) return false;\r\n root.draw(e.offsetX, e.offsetY, cnvBold, cnvColor);\r\n });\r\n\r\n\r\n\/*\r\n \/\/ \u8272\u306e\u5909\u66f4\r\n $(\".color a\").click(function(){\r\n cnvColor = $(this).data(\"color\");\r\n return false;\r\n });\r\n*\/\r\n\r\n let cElements = document.getElementsByClassName('color');\r\n var c_elms;\r\n for (let i = 0; i < cElements.length; i++) {\r\n c_elms = cElements[i].childNodes;\r\n\r\n for (let j = 0; j < c_elms.length; j++) {\r\n if(c_elms[j].tagName != 'A') {\r\n continue;\r\n }\r\n c_elms[j].onclick = function() {\r\n cnvColor = this.getAttribute( \"data-color\" ) ;\r\n console.log(\"cnvColor =\"+cnvColor );\r\n }\r\n }\r\n }\r\n\r\n\r\n\/*\r\n \/\/ \u7dda\u306e\u592a\u3055\u5909\u66f4\r\n $(\".bold a\").click(function(){\r\n cnvBold = $(this).data(\"bold\");\r\n return false;\r\n });\r\n*\/\r\n\r\n let bElements = document.getElementsByClassName('bold');\r\n var b_elms;\r\n for (let i = 0; i < bElements.length; i++) {\r\n b_elms = bElements[i].childNodes;\r\n\r\n for (let j = 0; j < b_elms.length; j++) {\r\n if(b_elms[j].tagName != 'A') {\r\n continue;\r\n }\r\n b_elms[j].onclick = function() {\r\n cnvBold = this.getAttribute( \"data-bold\" ) ;\r\n console.log(\"cnvBold =\"+cnvBold );\r\n }\r\n }\r\n }\r\n\r\n\r\n \/\/ \u63cf\u753b\u30af\u30ea\u30a2\r\n $(\"#clear\").click(function(){\r\n root.ctx.clearRect(0,0);\r\n root.setBgColor(bgColor);\r\n });\r\n\r\n \/\/ canvas\u3092\u753b\u50cf\u3067\u4fdd\u5b58\r\n $(\"#download\").click(function(){\r\n canvas = document.getElementById('canvas');\r\n var base64 = canvas.toDataURL(\"image\/jpeg\");\r\n document.getElementById(\"download\").href = base64;\r\n });\r\n}\r\n<\/pre>\n2.1 globalThis.clickFlg
\n init\u95a2\u6570\u5185\u306a\u306e\u3067\u3001\u30b0\u30eb\u30fc\u30d0\u30eb\u5909\u6570\u3067\u3042\u308b\u3053\u3068\u3092\u660e\u793a\u7684\u306b\u3059\u308b<\/p>\n
2.2 jQuery\u304b\u3089\u306e\u7f6e\u304d\u63db\u3048
\nbdfore:<\/p>\n
\r\n \/\/ \u7dda\u306e\u592a\u3055\u5909\u66f4\r\n $(\".bold a\").click(function(){\r\n cnvBold = $(this).data(\"bold\");\r\n return false;\r\n });\r\n<\/pre>\nafter:<\/p>\n
\r\n let bElements = document.getElementsByClassName('bold');\r\n var b_elms;\r\n for (let i = 0; i < bElements.length; i++) {\r\n b_elms = bElements[i].childNodes;\r\n\r\n for (let j = 0; j < b_elms.length; j++) {\r\n if(b_elms[j].tagName != 'A') {\r\n continue;\r\n }\r\n b_elms[j].onclick = function() {\r\n cnvBold = this.getAttribute( \"data-bold\" ) ;\r\n console.log(\"cnvBold =\"+cnvBold );\r\n }\r\n }\r\n }\r\n<\/pre>\n3.\u30bd\u30fc\u30b9\u3092\u3059\u3079\u3066\u8aad\u307f\u8fbc\u3093\u3067\u304b\u3089init\u3092\u5b9f\u884c\u3055\u305b\u308b<\/p>\n
\r\nwindow.onload = init;\r\n<\/pre>\n","protected":false},"excerpt":{"rendered":"1. root\u30aa\u30b8\u30a7\u30af\u30c8\u306e\u5b9a\u7fa9 root = { \/\/ context “ctx”:null, \/\/ ccanvas\u306e\u521d\u671f\u5316 “init”:function () { var cnvs = document.getEle…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_mi_skip_tracking":false},"categories":[1],"tags":[],"_links":{"self":[{"href":"https:\/\/blog.wsd.sh\/index.php?rest_route=\/wp\/v2\/posts\/334"}],"collection":[{"href":"https:\/\/blog.wsd.sh\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.wsd.sh\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.wsd.sh\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.wsd.sh\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=334"}],"version-history":[{"count":1,"href":"https:\/\/blog.wsd.sh\/index.php?rest_route=\/wp\/v2\/posts\/334\/revisions"}],"predecessor-version":[{"id":335,"href":"https:\/\/blog.wsd.sh\/index.php?rest_route=\/wp\/v2\/posts\/334\/revisions\/335"}],"wp:attachment":[{"href":"https:\/\/blog.wsd.sh\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=334"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.wsd.sh\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=334"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.wsd.sh\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=334"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}