HTML canvas isPointInPath() 方法 Canvas 對象實例如果點 20,50 位于當前路徑中,則繪制一個矩形:YourbrowserdoesnotsupporttheHTML5canvastag.JavaScript:var c=document.getElementById("myCanvas");var ctx=c.getContext("2d");ctx.rect(20,20,150,100);if (ctx.isPointInPath(20,50)) {...
http://www.o2fo.com/jsref/met-canvas-ispointinpath.htmlHTML canvas strokeText() 方法 Canvas 對象實例使用 strokeText(),在畫布上寫文本 "Hello world!" 和 "Big smile!"(帶漸變):YourbrowserdoesnotsupporttheHTML5canvastag.JavaScript:var c=document.getElementById("myCanvas");var ctx=c.getContext("2d");ctx.font="20px Georgia";ctx.str...
http://www.o2fo.com/jsref/met-canvas-stroketext.htmlHTML canvas beginPath() 方法 Canvas 對象實例在畫布上繪制兩條路徑;綠色和紫色:YourbrowserdoesnotsupporttheHTML5canvastag.JavaScript:var c=document.getElementById("myCanvas");var ctx=c.getContext("2d");ctx.beginPath(); ctx.lineWidth="5";ctx.strokeStyle="green"; // Green pathc...
http://www.o2fo.com/jsref/met-canvas-beginpath.htmlHTML canvas scale() 方法 Canvas 對象實例繪制矩形,放大到 200%,然后再次繪制矩形:YourbrowserdoesnotsupporttheHTML5canvastag.JavaScript:var c=document.getElementById("myCanvas");var ctx=c.getContext("2d");ctx.strokeRect(5,5,25,15);ctx.scale(2,2);ctx.strokeRect(5,5,25,15);嘗...
http://www.o2fo.com/jsref/met-canvas-scale.htmlHTML canvas measureText() 方法 Canvas 對象實例在畫布上輸出文本之前,檢查字體的寬度:YourbrowserdoesnotsupporttheHTML5canvastag.JavaScript:var c=document.getElementById("myCanvas");varctx=c.getContext("2d");ctx.font="30px Arial";var txt="Hello World"ctx.fillText("width:" + ...
http://www.o2fo.com/jsref/met-canvas-measuretext.htmlHTML canvas moveTo() 方法 Canvas 對象實例開始一條路徑,移動到位置 0,0。創(chuàng)建到達位置 300,150 的一條線:YourbrowserdoesnotsupporttheHTML5canvastag.JavaScript:var c=document.getElementById("myCanvas");var ctx=c.getContext("2d");ctx.beginPath();ctx.moveTo(0,0);ctx.lineTo(...
http://www.o2fo.com/jsref/met-canvas-moveto.htmlHTML canvas rotate() 方法 Canvas 對象實例將矩形旋轉(zhuǎn) 20 度:YourbrowserdoesnotsupporttheHTML5canvastag.JavaScript:var c=document.getElementById("myCanvas");var ctx=c.getContext("2d");ctx.rotate(20*Math.PI/180);ctx.fillRect(50,20,100,50);嘗試一下 ?瀏覽器支持Internet Explorer 9...
http://www.o2fo.com/jsref/met-canvas-rotate.htmlHTML canvas closePath() 方法 Canvas 對象實例繪制一條路徑,形式是字母 L,然后繪制線條以返回開始點:YourbrowserdoesnotsupporttheHTML5canvastag.JavaScript:var c=document.getElementById("myCanvas");var ctx=c.getContext("2d");ctx.beginPath();ctx.moveTo(20,20);ctx.lineTo(...
http://www.o2fo.com/jsref/met-canvas-closepath.htmlHTML canvas translate() 方法 Canvas 對象實例在位置 (10,10) 處繪制一個矩形,將新的 (0,0) 位置設(shè)置為 (70,70)。再次繪制新的矩形(請注意現(xiàn)在矩形從位置 (80,80) 開始繪制):YourbrowserdoesnotsupporttheHTML5canvastag.JavaScript:var c=document.getElementB...
http://www.o2fo.com/jsref/met-canvas-translate.htmlHTML canvas ImageData width 屬性 Canvas 對象實例輸出 ImageData 對象的寬度:alert("Width of imgData is: " + imgData.width);嘗試一下 ?瀏覽器支持Internet Explorer 9、Firefox、Opera、Chrome 和 Safari 支持 ImageData width 屬性。注意:Internet Explorer 8 及之前的版...
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HTML canvas isPointInPath() 方法 Canvas 對象實例如果點 20,50 位于當前路徑中,則繪制一個矩形:YourbrowserdoesnotsupporttheHTML5canvastag.JavaScript:var c=document.getElementById("myCanvas");var ctx=c.getContext("2d");ctx.rect(20,20,150,100);if (ctx.isPointInPath(20,50)) {...
http://www.o2fo.com/jsref/met-canvas-ispointinpath.htmlHTML canvas strokeText() 方法 Canvas 對象實例使用 strokeText(),在畫布上寫文本 "Hello world!" 和 "Big smile!"(帶漸變):YourbrowserdoesnotsupporttheHTML5canvastag.JavaScript:var c=document.getElementById("myCanvas");var ctx=c.getContext("2d");ctx.font="20px Georgia";ctx.str...
http://www.o2fo.com/jsref/met-canvas-stroketext.htmlHTML canvas beginPath() 方法 Canvas 對象實例在畫布上繪制兩條路徑;綠色和紫色:YourbrowserdoesnotsupporttheHTML5canvastag.JavaScript:var c=document.getElementById("myCanvas");var ctx=c.getContext("2d");ctx.beginPath(); ctx.lineWidth="5";ctx.strokeStyle="green"; // Green pathc...
http://www.o2fo.com/jsref/met-canvas-beginpath.htmlHTML canvas scale() 方法 Canvas 對象實例繪制矩形,放大到 200%,然后再次繪制矩形:YourbrowserdoesnotsupporttheHTML5canvastag.JavaScript:var c=document.getElementById("myCanvas");var ctx=c.getContext("2d");ctx.strokeRect(5,5,25,15);ctx.scale(2,2);ctx.strokeRect(5,5,25,15);嘗...
http://www.o2fo.com/jsref/met-canvas-scale.htmlHTML canvas measureText() 方法 Canvas 對象實例在畫布上輸出文本之前,檢查字體的寬度:YourbrowserdoesnotsupporttheHTML5canvastag.JavaScript:var c=document.getElementById("myCanvas");varctx=c.getContext("2d");ctx.font="30px Arial";var txt="Hello World"ctx.fillText("width:" + ...
http://www.o2fo.com/jsref/met-canvas-measuretext.htmlHTML canvas moveTo() 方法 Canvas 對象實例開始一條路徑,移動到位置 0,0。創(chuàng)建到達位置 300,150 的一條線:YourbrowserdoesnotsupporttheHTML5canvastag.JavaScript:var c=document.getElementById("myCanvas");var ctx=c.getContext("2d");ctx.beginPath();ctx.moveTo(0,0);ctx.lineTo(...
http://www.o2fo.com/jsref/met-canvas-moveto.htmlHTML canvas rotate() 方法 Canvas 對象實例將矩形旋轉(zhuǎn) 20 度:YourbrowserdoesnotsupporttheHTML5canvastag.JavaScript:var c=document.getElementById("myCanvas");var ctx=c.getContext("2d");ctx.rotate(20*Math.PI/180);ctx.fillRect(50,20,100,50);嘗試一下 ?瀏覽器支持Internet Explorer 9...
http://www.o2fo.com/jsref/met-canvas-rotate.htmlHTML canvas closePath() 方法 Canvas 對象實例繪制一條路徑,形式是字母 L,然后繪制線條以返回開始點:YourbrowserdoesnotsupporttheHTML5canvastag.JavaScript:var c=document.getElementById("myCanvas");var ctx=c.getContext("2d");ctx.beginPath();ctx.moveTo(20,20);ctx.lineTo(...
http://www.o2fo.com/jsref/met-canvas-closepath.htmlHTML canvas translate() 方法 Canvas 對象實例在位置 (10,10) 處繪制一個矩形,將新的 (0,0) 位置設(shè)置為 (70,70)。再次繪制新的矩形(請注意現(xiàn)在矩形從位置 (80,80) 開始繪制):YourbrowserdoesnotsupporttheHTML5canvastag.JavaScript:var c=document.getElementB...
http://www.o2fo.com/jsref/met-canvas-translate.htmlHTML canvas ImageData width 屬性 Canvas 對象實例輸出 ImageData 對象的寬度:alert("Width of imgData is: " + imgData.width);嘗試一下 ?瀏覽器支持Internet Explorer 9、Firefox、Opera、Chrome 和 Safari 支持 ImageData width 屬性。注意:Internet Explorer 8 及之前的版...
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