67 lines
1.9 KiB
JavaScript
67 lines
1.9 KiB
JavaScript
import { isNodePattern, throwError } from '@jimp/utils';
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export default () => ({
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/**
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* Uniformly scales the image by a factor.
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* @param {number} f the factor to scale the image by
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* @param {string} mode (optional) a scaling method (e.g. Jimp.RESIZE_BEZIER)
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* @param {function(Error, Jimp)} cb (optional) a callback for when complete
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* @returns {Jimp} this for chaining of methods
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*/
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scale(f, mode, cb) {
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if (typeof f !== 'number') {
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return throwError.call(this, 'f must be a number', cb);
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}
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if (f < 0) {
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return throwError.call(this, 'f must be a positive number', cb);
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}
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if (typeof mode === 'function' && typeof cb === 'undefined') {
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cb = mode;
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mode = null;
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}
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const w = this.bitmap.width * f;
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const h = this.bitmap.height * f;
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this.resize(w, h, mode);
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if (isNodePattern(cb)) {
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cb.call(this, null, this);
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}
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return this;
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},
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/**
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* Scale the image to the largest size that fits inside the rectangle that has the given width and height.
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* @param {number} w the width to resize the image to
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* @param {number} h the height to resize the image to
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* @param {string} mode (optional) a scaling method (e.g. Jimp.RESIZE_BEZIER)
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* @param {function(Error, Jimp)} cb (optional) a callback for when complete
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* @returns {Jimp} this for chaining of methods
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*/
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scaleToFit(w, h, mode, cb) {
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if (typeof w !== 'number' || typeof h !== 'number') {
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return throwError.call(this, 'w and h must be numbers', cb);
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}
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if (typeof mode === 'function' && typeof cb === 'undefined') {
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cb = mode;
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mode = null;
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}
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const f =
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w / h > this.bitmap.width / this.bitmap.height
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? h / this.bitmap.height
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: w / this.bitmap.width;
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this.scale(f, mode);
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if (isNodePattern(cb)) {
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cb.call(this, null, this);
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}
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return this;
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}
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});
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