index.js•1.35 kB
import { isNodePattern } from "@jimp/utils";
/**
* Creates a circle out of an image.
* @param {function(Error, Jimp)} options (optional) radius, x, y
* @param {function(Error, Jimp)} cb (optional) a callback for when complete
* @returns {Jimp} this for chaining of methods
*/
export default (() => ({
circle() {
let options = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {};
let cb = arguments.length > 1 ? arguments[1] : undefined;
if (typeof options === "function") {
cb = options;
options = {};
}
const radius = options.radius || (this.bitmap.width > this.bitmap.height ? this.bitmap.height : this.bitmap.width) / 2;
const center = {
x: typeof options.x === "number" ? options.x : this.bitmap.width / 2,
y: typeof options.y === "number" ? options.y : this.bitmap.height / 2
};
this.scanQuiet(0, 0, this.bitmap.width, this.bitmap.height, function (x, y, idx) {
const curR = Math.sqrt(Math.pow(x - center.x, 2) + Math.pow(y - center.y, 2));
if (radius - curR <= 0.0) {
this.bitmap.data[idx + 3] = 0;
} else if (radius - curR < 1.0) {
this.bitmap.data[idx + 3] = 255 * (radius - curR);
}
});
if (isNodePattern(cb)) {
cb.call(this, null, this);
}
return this;
}
}));
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