@polygonjs/polygonjs
Version:
node-based WebGL 3D engine https://polygonjs.com
53 lines (52 loc) • 1.47 kB
JavaScript
;
import { BaseMethod } from "./_Base";
const EXPECTED_ARGS_COUNT = 3;
const _pointsSrc = [];
export class PointExpression extends BaseMethod {
static requiredArguments() {
return [
["string", "path to node"],
["string", "attribute name"],
["index", "point index"]
];
}
findDependency(args) {
return this.createDependencyFromIndexOrPath(args);
}
processArguments(args) {
return new Promise(async (resolve, reject) => {
if (args.length == EXPECTED_ARGS_COUNT) {
const index_or_path = args[0];
const attrib_name = args[1];
const point_index = args[2];
let container = null;
try {
container = await this.getReferencedNodeContainer(index_or_path);
} catch (e) {
reject(e);
}
if (container) {
const value = this._get_value_from_container(container, attrib_name, point_index);
resolve(value);
}
} else {
console.warn(`${args.length} given when expected ${EXPECTED_ARGS_COUNT}`);
resolve(0);
}
});
}
_get_value_from_container(container, attrib_name, point_index) {
const coreGroup = container.coreContent();
if (coreGroup) {
coreGroup.points(_pointsSrc);
const point = _pointsSrc[point_index];
if (point) {
return point.attribValue(attrib_name);
} else {
return 0;
}
} else {
return null;
}
}
}