crop image with canva in javascript

To crop an image with Canva in Javascript, you need to first create a canvas element to display the image, then create a new canvas element with the cropped dimensions, and draw the cropped image onto it using the drawImage() method.

Here is an example code snippet that crops an image:


index.tsx
// Load the image
const img = new Image();
img.src = 'path/to/image.png';

// Create a canvas to display the image
const canvas = document.createElement('canvas');
document.body.appendChild(canvas);
const ctx = canvas.getContext('2d');

// Draw the image onto the canvas
img.onload = function() {
  canvas.width = img.width;
  canvas.height = img.height;
  ctx.drawImage(img, 0, 0);
};

// Create a new, smaller canvas for the cropped image
const croppedCanvas = document.createElement('canvas');
const croppedCtx = croppedCanvas.getContext('2d');

// Define the cropping parameters
const x = 50;
const y = 50;
const width = 100;
const height = 100;

// Draw the cropped image onto the new canvas
croppedCanvas.width = width;
croppedCanvas.height = height;
croppedCtx.drawImage(canvas, x, y, width, height, 0, 0, width, height);

// Get the cropped image data as a URL and display it
const croppedImage = croppedCanvas.toDataURL();
const croppedImgEl = document.createElement('img');
croppedImgEl.src = croppedImage;
document.body.appendChild(croppedImgEl);
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In this example, we start by loading the image and creating a canvas element to display it. Once the image has finished loading, we draw it onto the canvas using the drawImage() method.

Next, we create a new canvas element and getContext() for it, and define the cropping parameters (in this case, a 100x100 pixel rectangle starting at (50,50) on the original canvas). We then draw the cropped image onto the new canvas using drawImage() again.

Finally, we get the cropped image data as a data URL using toDataURL(), create a new img element with the URL as the source, and append it to the document.

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