使画布大小达到图像大小？

Question

Im reading a file, checking it's exif data, adding to canvas and transforming if necessary. 我正在读取文件，检查它的exif数据，添加到画布并在必要时进行转换。

I need to keep the canvas the same size as the original image, I've tried this: 我需要使画布的大小与原始图像的大小相同，我已经尝试过：

ctx.drawImage(img, 0, 0, img.width, img.height, 0, 0, img.width, img.height);

This seems to default the canvas size to the default of 300 x 150. 这似乎默认将画布大小设置为默认的300 x 150。

How can I make the canvas the size of the image? 如何使画布达到图像的大小？

Answer 1

ctx.canvas.width = img.width
ctx.canvas.height = img.height

Should work fine 应该工作正常