34 lines
1.2 KiB
TypeScript
34 lines
1.2 KiB
TypeScript
/**
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* Compute optimal dimensions for a resized version of an image while
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* maintaining aspect ratio of the source image.
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*
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* @param width The width of the source image.
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*
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* @param height The height of the source image.
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*
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* @param maxDimension The maximum width of height of the resized image.
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*
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* This function returns a new size limiting it to maximum width and height
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* (both specified by {@link maxDimension}), while maintaining aspect ratio of
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* the source {@link width} and {@link height}.
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*
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* It returns `{0, 0}` for invalid inputs.
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*/
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export const scaledImageDimensions = (
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width: number,
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height: number,
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maxDimension: number,
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): { width: number; height: number } => {
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if (width == 0 || height == 0) return { width: 0, height: 0 };
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const widthScaleFactor = maxDimension / width;
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const heightScaleFactor = maxDimension / height;
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const scaleFactor = Math.min(widthScaleFactor, heightScaleFactor);
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const resizedDimensions = {
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width: Math.round(width * scaleFactor),
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height: Math.round(height * scaleFactor),
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};
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if (resizedDimensions.width == 0 || resizedDimensions.height == 0)
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return { width: 0, height: 0 };
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return resizedDimensions;
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};
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