47 lines
1.5 KiB
JavaScript
47 lines
1.5 KiB
JavaScript
import { isNodePattern } from "@jimp/utils";
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/**
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* Creates a circle out of an image.
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* @param {object} options (optional) r: radius of effect
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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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export default (() => ({
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fisheye() {
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let options = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {
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r: 2.5
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};
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let cb = arguments.length > 1 ? arguments[1] : undefined;
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if (typeof options === "function") {
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cb = options;
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options = {
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r: 2.5
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};
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}
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const source = this.cloneQuiet();
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const {
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width,
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height
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} = source.bitmap;
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source.scanQuiet(0, 0, width, height, (x, y) => {
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const hx = x / width;
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const hy = y / height;
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const r = Math.sqrt(Math.pow(hx - 0.5, 2) + Math.pow(hy - 0.5, 2));
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const rn = 2 * Math.pow(r, options.r);
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const cosA = (hx - 0.5) / r;
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const sinA = (hy - 0.5) / r;
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const newX = Math.round((rn * cosA + 0.5) * width);
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const newY = Math.round((rn * sinA + 0.5) * height);
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const color = source.getPixelColor(newX, newY);
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this.setPixelColor(color, x, y);
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});
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/* Set center pixel color, otherwise it will be transparent */
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this.setPixelColor(source.getPixelColor(width / 2, height / 2), width / 2, height / 2);
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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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//# sourceMappingURL=index.js.map
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