Current Dev State

static/js/ketcher2/script/editor/tool/utils.js

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+/****************************************************************************
+ * Copyright 2017 EPAM Systems
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ ***************************************************************************/
+
+var Vec2 = require('../../util/vec2');
+
+var FRAC = Math.PI / 12; // '15º'
+
+function setFracAngle(angle) {
+	FRAC = Math.PI / 180 * angle;
+}
+
+function calcAngle(pos0, pos1) {
+	var v = Vec2.diff(pos1, pos0);
+	return Math.atan2(v.y, v.x);
+}
+
+function fracAngle(angle) {
+	if (arguments.length > 1)
+		angle = calcAngle(arguments[0], arguments[1]);
+	return Math.round(angle / FRAC) * FRAC;
+}
+
+function calcNewAtomPos(pos0, pos1) {
+	var v = new Vec2(1, 0).rotate(fracAngle(pos0, pos1));
+	v.add_(pos0); // eslint-disable-line no-underscore-dangle
+	return v;
+}
+
+function degrees(angle) {
+	return Math.round(angle / Math.PI * 180);
+}
+
+module.exports = {
+	calcAngle: calcAngle,
+	fracAngle: fracAngle,
+	calcNewAtomPos: calcNewAtomPos,
+	degrees: degrees,
+	setFracAngle: setFracAngle
+};