We display images according to the width of the parent div. If you need to position items on that image based on x, y coordinates, you must calculate the final x, y coordinates based on the resize factor of that image. The following code snippet will assist you in obtaining the resize factor. Using this factor, you can resize the image for a specific width and height and retrieve the dimensions of the final image with the applied resize factor.

const getImageDimension = (url, adjustWidth, adjustHeight) => {
return new Promise(async (resolve, reject) => {
if (url) {
const img = new Image();
img.onload = element => {
const hFactor = element.target.height / adjustHeight;
const wFactor = element.target.width / adjustWidth;
if (hFactor > wFactor) {
const dim = {
width: element.target.width,
height: element.target.height,
factor: element.target.height / adjustHeight
};
if (adjustHeight) {
dim.width = element.target.width * (adjustHeight / dim.height);
dim.height = adjustHeight;
}
resolve(dim);
} else {
const dim = {
width: element.target.width,
height: element.target.height,
factor: element.target.width / adjustWidth
};
if (adjustWidth) {
dim.height = element.target.height * (adjustWidth / dim.width);
dim.width = adjustWidth;
}
resolve(dim);
}
};
img.onerror = () => {
reject(new Error('Image not found'));
};
img.src = url;
} else {
reject(new Error('Invalid Image URL'));
}
});
};

1 comment:

  1. What a helpful guide! Understanding the resize factor of an image after adjusting its width or height in JavaScript is crucial for responsive design. This article breaks it down perfectly, making it easy for developers to implement. Understanding the resize factor

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