非常簡單的帆布漆作品無法在Chrome

我被this script這是從http://www.robodesign.ro/coding/canvas-paint/20090423/非常簡單的帆布漆作品無法在Chrome

修改它非常好外匯10，但不是在所有的Chrome。

我擺脫了鍍鉻通過交換OFFSETX和layerX警告有關棄用event.layerX/Y，但它仍然沒有吸取。

必須是非常簡單的東西。
UPDATE：它是 - 評了兩次context.moveTo(ev._x, ev._y);的伎倆

<!DOCTYPE html> 
<html lang="en"> 
    <head> 
    <meta charset="utf-8"> 
    <title>Paint</title> 
    <style type="text/css"><!-- 
     #container { position: relative; } 
     #imageView { border: 1px solid #000; } 
    --></style> 
    </head> 
    <body BGCOLOR="#CCFFFF"> 

    <div id="container"> 
     <canvas id="imageView" width="700" height="643" margin: 0 auto> 
     <p>Unfortunately, your browser is currently unsupported by our web 
     application. We are sorry for the inconvenience. Please use one of the 
     supported browsers listed below, or draw the image you want using an 
     offline tool.</p> 
     <p>Supported browsers: <a href="http://www.opera.com">Opera</a>, <a 
      href="http://www.mozilla.com">Firefox</a>, <a 
      href="http://www.apple.com/safari">Safari</a>, and <a 
      href="http://www.konqueror.org">Konqueror</a>.</p> 
     </canvas> 
    </div> 

    <script type="text/javascript"> 
/* © 2009 ROBO Design 
* http://www.robodesign.ro 
*/ 

// Keep everything in anonymous function, called on window load. 
if(window.addEventListener) { 
window.addEventListener('load', function() { 
    var canvas, context, tool; 

    function init() { 
    // Find the canvas element. 
    canvas = document.getElementById('imageView'); 
    if (!canvas) { 
     alert('Error: I cannot find the canvas element!'); 
     return; 
    } 

    if (!canvas.getContext) { 
     alert('Error: no canvas.getContext!'); 
     return; 
    } 

    // Get the 2D canvas context. 
    context = canvas.getContext('2d'); 
    if (!context) { 
     alert('Error: failed to getContext!'); 
     return; 
    } 

    var img=new Image(); 
    img.onload = function(){ 
    context.drawImage(img,0,0); 
    }; 
    img.src=" PainDiagram.png"; 

    // Pencil tool instance. 
    tool = new tool_pencil(); 

    // Attach the mousedown, mousemove and mouseup event listeners. 
    canvas.addEventListener('mousedown', ev_canvas, false); 
    canvas.addEventListener('mousemove', ev_canvas, false); 
    canvas.addEventListener('mouseup', ev_canvas, false); 
    } 

    // This painting tool works like a drawing pencil which tracks the mouse 
    // movements. 
    function tool_pencil() { 
    var tool = this; 
    this.started = false; 

    // This is called when you start holding down the mouse button. 
    // This starts the pencil drawing. 
    this.mousedown = function (ev) { 
     context.beginPath(); 
     context.lineWidth = 5; 
     context.lineCap = "round"; 
     context.globalAlpha=0.01; 
     context.shadowColor="red"; 
     context.shadowBlur=10; 
     context.strokeStyle = "red"; // line color 
     context.moveTo(ev._x, ev._y); 
     tool.started = true; 
    }; 

    // This function is called every time you move the mouse. Obviously, it only 
    // draws if the tool.started state is set to true (when you are holding down 
    // the mouse button). 
    this.mousemove = function (ev) { 
     if (tool.started) { 
     //var p = context.getImageData(ev._x, ev._y, 1, 1).data; 
     //if(p[0]==255 && p[1]==204 && p[2]==153){ 
      context.moveTo(ev._x, ev._y); 
      context.lineTo(ev._x, ev._y); 
      context.stroke(); 
     //} 
     } 
    }; 

    // This is called when you release the mouse button. 
    this.mouseup = function (ev) { 
     if (tool.started) { 
     tool.mousemove(ev); 
     tool.started = false; 
     } 
    }; 
    } 

    // The general-purpose event handler. This function just determines the mouse 
    // position relative to the canvas element. 


    function ev_canvas (ev) { 
    if (ev.offsetX || ev.offsetX == 0) { // Opera and WebKit 
     ev._x = ev.offsetX; 
     ev._y = ev.offsetY; 
    } 
    else if (ev.layerX || ev.layerX == 0) { // Firefox 
     ev._x = ev.layerX; 
     ev._y = ev.layerY; 
    } 

    // Call the event handler of the tool. 
    var func = tool[ev.type]; 
    if (func) { 
     func(ev); 
    } 
    } 

    init(); 

}, false); } 

// vim:set spell spl=en fo=wan1croql tw=80 ts=2 sw=2 sts=2 sta et ai cin fenc=utf-8 ff=unix: 

    </script> 
    </body> 
</html>

來源

2012-03-14 mplungjan

從this.mousemove刪除線context.moveTo(ev._x, ev._y);。

moveTo()方法創建一個新的子路徑，因此您要告訴畫布將描邊應用於長度爲零像素的路徑。 Firefox顯然支持這一點。請參閱canvas documentation瞭解更多信息。

來源

2012-03-15 22:25:32 Xenethyl

你剛剛錯過了一個賞金。謝謝！ – mplungjan 2012-03-16 07:48:16

沒問題。很高興幫助！ :) – Xenethyl 2012-03-16 12:02:07

非常簡單的帆布漆作品無法在Chrome

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