在控制台上绘制HTML5画布

Question

I want to draw human photos on console using nodejs. To draw better quality images I need a library or module that allows me to draw images on console. There certain modules such as imaging and console-png .

However the quality is not that great. How can I draw images probably using HTML5 canvas on console?

Answer 1

Consoles are text devices, they're not designed for graphics. There are ways of displaying fancy colours etc. in the console but you cannot render an image file or anything there without converting it to text first, like your example, console-png.

Answer 2

Please note that this answer is for console (Not the node.js CMD prompt). As this question's title will direct some here that may be using NW.js or similar, allowing node.js console output to be to the V8 dev tools console. There are also some Github solutions that allow console to be directed to V8 dev tools for node.js.

There is also new debugging tools via Chrome Canary lets you debug your browser JavaScript files and Node.js ones in the same DevTools window in parallel.

For Chrome use the console style string directive "%c" in the "console.log" in the first string argument to specify a style.

eg

console.log("%c Blue text","background:blue;"); 

The second argument becomes the` style.

So the logical extension to that is to add a background image and what do you know, it works.

 document.body.innerHTML += "For Chrome users hit F12 to open the console. and see it work." console.log("%c Smile .","font-size:28px;color:red;background-image:url('data:image/png;base64,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');"); 

And you have an image. As node.js is V8 then this should be the solution you are after, with a bit of extra styling to make it more image like than background like.

So to do from a canvas just use canvas.toDataURL to get the background URL

And according to this 4year old answer it also works on Firefox.. but not for me and I am sure someone that can make Edge run without overheating their GPU and shutting down their machine will tell you if it works on Edge. |:P