59 lines
1.8 KiB
JavaScript
59 lines
1.8 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 {function(Error, Jimp)} options (optional)
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* opacity - opacity of the shadow between 0 and 1
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* size,- of the shadow
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* blur - how blurry the shadow is
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* x- x position of shadow
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* y - y position of shadow
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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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shadow() {
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let options = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {};
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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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}
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const {
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opacity = 0.7,
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size = 1.1,
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x = -25,
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y = 25,
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blur = 5
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} = options;
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// clone the image
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const orig = this.clone();
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const shadow = this.clone();
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// turn all it's pixels black
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shadow.scan(0, 0, shadow.bitmap.width, shadow.bitmap.height, (x, y, idx) => {
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shadow.bitmap.data[idx] = 0x00;
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shadow.bitmap.data[idx + 1] = 0x00;
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shadow.bitmap.data[idx + 2] = 0x00;
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// up the opacity a little,
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shadow.bitmap.data[idx + 3] = shadow.constructor.limit255(shadow.bitmap.data[idx + 3] * opacity);
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this.bitmap.data[idx] = 0x00;
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this.bitmap.data[idx + 1] = 0x00;
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this.bitmap.data[idx + 2] = 0x00;
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this.bitmap.data[idx + 3] = 0x00;
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});
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// enlarge it. This creates a "shadow".
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shadow.resize(shadow.bitmap.width * size, shadow.bitmap.height * size).blur(blur);
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// Then blit the "shadow" onto the background and the image on top of that.
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this.composite(shadow, x, y);
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this.composite(orig, 0, 0);
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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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