Transferring an image from a canvas in Windows 8.1

Recently, I've been working on developing a paint program for Windows 8 using JavaScript. However, I have encountered a setback. I am struggling with the process of exporting an image from a canvas. While I am somewhat familiar with the FileSavePicker, I am in need of assistance.

I came across this resource, but I am unsure how to go about creating an "encoding" variable: Saving a Canvas as an image in Windows 8

If there is a simpler method or if someone could provide clarification on the topic, it would be greatly appreciated.

Answer №1

To convert your canvas into an image, you can utilize the method canvas.toDataURL().

Subsequently, display this image in a new window using the following code:

    var win=window.open();
    win.document.write("<img src='"+canvas.toDataURL()+"'/>");

Your users can then perform the standard right-click-save action within that newly opened window.

Below is a functional example:

<!doctype html>
<html>
<head>
<link rel="stylesheet" type="text/css" media="all" href="css/reset.css" /> <!-- resetting css properties -->
<script type="text/javascript" src="http://code.jquery.com/jquery.min.js"></script>

<style>
    body{ background-color: ivory; }
    canvas{border:1px solid red;}
</style>

<script>
$(function(){

    var canvas=document.getElementById("canvas");
    var ctx=canvas.getContext("2d");

    ctx.fillStyle="gold";
    ctx.strokeStyle="blue";
    ctx.lineWidth=5;
    ctx.rect(50,50,100,100);
    ctx.fill();
    ctx.stroke();

    var win=window.open();
    win.document.write("<img src='"+canvas.toDataURL()+"'/>");


}); // end $(function(){});
</script>

</head>

<body>
    <canvas id="canvas" width=300 height=300></canvas>
</body>
</html>

Answer №2

After encountering various challenges while using Html to develop a Windows 8 app, I made the switch to C# and Xaml for better solutions.

Initially, I preferred Html and JavaScript due to familiarity, but upon delving deeper into Xaml and C#, my preference shifted. Rather than relying heavily on <div> tags for every interface section, options like <Grid>, <Border>, and <StackPanel> proved more effective. The specific issue at hand was resolved promptly.

public async void Preview_Update()
{
    RenderTargetBitmap bitmap = new RenderTargetBitmap();
    await bitmap.RenderAsync(canvas);
    image.Source = bitmap;
}

Implementing the FileSavePicker functionality turned out to be straightforward: simply refer to theFileSavePicker documentation.

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