Among the functions of fabric js, there is a method or property that crops objects except canvas, but I did not find a function to crop the canvas itself. I tried changing the canvas to an image in the following way, cropping it, and then inserting it back into the canvas.
fabric.Image.fromURL(canvas.toDataURL(), img => {
currentImage = img; //save current canvas as image
currentImage.set({
scaleX : canvas.width / currentImage.width,
scaleY : canvas.height / currentImage.height,
cropX: selectionRect.left,
cropY: selectionRect.top,
width: selectionRect.getScaledWidth(),
height: selectionRect.getScaledHeight(),
});
canvas.setDimensions({
width: selectionRect.getScaledWidth(),
height: selectionRect.getScaledHeight()
});
canvas.setBackgroundImage(currentImage).renderAll();
but in this case, an image with a transparent background becomes a background.
If you look at the following picture, a picture of a flower without a background is on the canvas, and What I want is to resize the canvas by the dotted rectangle area without making any objects on the canvas an image as follows.
before crop:
after crop:
Just as the starting range and area are determined with attributes such as cropX or cropY when cropping an object, I would like to know how to apply this to the canvas as well.