added 0 div checks.

.eslintrc.js

@@ -0,0 +1,293 @@
+module.exports = {
+    "env": {
+        "browser": true,
+        "es6": true
+    },
+    "extends": "eslint:recommended",
+    "globals": {
+        "Atomics": "readonly",
+        "SharedArrayBuffer": "readonly"
+    },
+    "parserOptions": {
+        "ecmaVersion": 2018
+    },
+    "rules": {
+        "accessor-pairs": "error",
+        "array-bracket-newline": "error",
+        "array-bracket-spacing": [
+            "error",
+            "never"
+        ],
+        "array-callback-return": [
+            "error",
+            {
+                "allowImplicit": true
+            }
+        ],
+        "array-element-newline": "off",
+        "arrow-body-style": "error",
+        "arrow-parens": [
+            "error",
+            "as-needed"
+        ],
+        "arrow-spacing": [
+            "error",
+            {
+                "after": true,
+                "before": true
+            }
+        ],
+        "block-scoped-var": "off",
+        "block-spacing": [
+            "error",
+            "always"
+        ],
+        "brace-style": "off",
+        "callback-return": "off",
+        "camelcase": "error",
+        "capitalized-comments": "off",
+        "class-methods-use-this": "error",
+        "comma-dangle": "off",
+        "comma-spacing": "off",
+        "comma-style": [
+            "error",
+            "last"
+        ],
+        "complexity": "off",
+        "computed-property-spacing": [
+            "error",
+            "never"
+        ],
+        "consistent-return": "off",
+        "consistent-this": "error",
+        "curly": "off",
+        "default-case": "error",
+        "dot-location": "error",
+        "dot-notation": "error",
+        "eol-last": "error",
+        "eqeqeq": "off",
+        "func-call-spacing": "error",
+        "func-name-matching": "error",
+        "func-names": "off",
+        "func-style": "off",
+        "function-paren-newline": "off",
+        "generator-star-spacing": "error",
+        "global-require": "error",
+        "guard-for-in": "error",
+        "handle-callback-err": "error",
+        "id-blacklist": "error",
+        "id-length": "off",
+        "id-match": "error",
+        "implicit-arrow-linebreak": [
+            "error",
+            "beside"
+        ],
+        "indent": "off",
+        "indent-legacy": "off",
+        "init-declarations": "error",
+        "jsx-quotes": "error",
+        "key-spacing": "error",
+        "keyword-spacing": [
+            "error",
+            {
+                "after": true,
+                "before": true
+            }
+        ],
+        "line-comment-position": "off",
+        "linebreak-style": [
+            "error",
+            "unix"
+        ],
+        "lines-around-comment": "off",
+        "lines-around-directive": "error",
+        "lines-between-class-members": "error",
+        "max-classes-per-file": "error",
+        "max-depth": "off",
+        "max-len": "off",
+        "max-lines": "off",
+        "max-lines-per-function": "off",
+        "max-nested-callbacks": "error",
+        "max-params": "off",
+        "max-statements": "off",
+        "max-statements-per-line": "off",
+        "multiline-comment-style": [
+            "error",
+            "separate-lines"
+        ],
+        "new-cap": "error",
+        "new-parens": "error",
+        "newline-after-var": "off",
+        "newline-before-return": "off",
+        "newline-per-chained-call": "error",
+        "no-alert": "error",
+        "no-array-constructor": "error",
+        "no-await-in-loop": "error",
+        "no-bitwise": "off",
+        "no-buffer-constructor": "error",
+        "no-caller": "error",
+        "no-catch-shadow": "error",
+        "no-confusing-arrow": "error",
+        "no-console": "off",
+        "no-continue": "off",
+        "no-div-regex": "error",
+        "no-duplicate-imports": "error",
+        "no-else-return": "off",
+        "no-empty-function": "error",
+        "no-eq-null": "off",
+        "no-eval": "error",
+        "no-extend-native": "error",
+        "no-extra-bind": "error",
+        "no-extra-label": "error",
+        "no-extra-parens": "off",
+        "no-floating-decimal": "error",
+        "no-implicit-coercion": "error",
+        "no-implicit-globals": "error",
+        "no-implied-eval": "error",
+        "no-inline-comments": "off",
+        "no-inner-declarations": [
+            "error",
+            "functions"
+        ],
+        "no-invalid-this": "error",
+        "no-iterator": "error",
+        "no-label-var": "error",
+        "no-labels": "error",
+        "no-lone-blocks": "error",
+        "no-lonely-if": "off",
+        "no-loop-func": "error",
+        "no-magic-numbers": "off",
+        "no-mixed-operators": "off",
+        "no-mixed-requires": "error",
+        "no-multi-assign": "off",
+        "no-multi-spaces": "error",
+        "no-multi-str": "error",
+        "no-multiple-empty-lines": "error",
+        "no-native-reassign": "error",
+        "no-negated-condition": "error",
+        "no-negated-in-lhs": "error",
+        "no-nested-ternary": "error",
+        "no-new": "error",
+        "no-new-func": "error",
+        "no-new-object": "error",
+        "no-new-require": "error",
+        "no-new-wrappers": "error",
+        "no-octal-escape": "error",
+        "no-param-reassign": "off",
+        "no-path-concat": "error",
+        "no-plusplus": "off",
+        "no-process-env": "error",
+        "no-process-exit": "error",
+        "no-proto": "error",
+        "no-restricted-globals": "error",
+        "no-restricted-imports": "error",
+        "no-restricted-modules": "error",
+        "no-restricted-properties": "error",
+        "no-restricted-syntax": "error",
+        "no-return-assign": "error",
+        "no-return-await": "error",
+        "no-script-url": "error",
+        "no-self-compare": "error",
+        "no-sequences": "error",
+        "no-shadow": "off",
+        "no-spaced-func": "error",
+        "no-sync": "error",
+        "no-tabs": "off",
+        "no-template-curly-in-string": "error",
+        "no-ternary": "off",
+        "no-throw-literal": "error",
+        "no-undef-init": "error",
+        "no-undefined": "off",
+        "no-unmodified-loop-condition": "error",
+        "no-unneeded-ternary": "error",
+        "no-use-before-define": "off",
+        "no-useless-call": "error",
+        "no-useless-computed-key": "error",
+        "no-useless-concat": "error",
+        "no-useless-constructor": "error",
+        "no-useless-rename": "error",
+        "no-useless-return": "error",
+        "no-var": "off",
+        "no-void": "error",
+        "no-warning-comments": "off",
+        "no-whitespace-before-property": "error",
+        "object-curly-newline": "error",
+        "object-curly-spacing": [
+            "error",
+            "always"
+        ],
+        "object-shorthand": "off",
+        "one-var": "off",
+        "one-var-declaration-per-line": "off",
+        "operator-assignment": "off",
+        "operator-linebreak": "error",
+        "padded-blocks": "off",
+        "padding-line-between-statements": "error",
+        "prefer-arrow-callback": "off",
+        "prefer-const": "off",
+        "prefer-destructuring": "off",
+        "prefer-named-capture-group": "error",
+        "prefer-numeric-literals": "error",
+        "prefer-object-spread": "error",
+        "prefer-promise-reject-errors": "error",
+        "prefer-reflect": "off",
+        "prefer-rest-params": "error",
+        "prefer-spread": "error",
+        "prefer-template": "off",
+        "quote-props": "off",
+        "quotes": "off",
+        "radix": [
+            "error",
+            "as-needed"
+        ],
+        "require-await": "error",
+        "require-jsdoc": "off",
+        "require-unicode-regexp": "error",
+        "rest-spread-spacing": "error",
+        "semi": "off",
+        "semi-spacing": [
+            "error",
+            {
+                "after": true,
+                "before": false
+            }
+        ],
+        "semi-style": [
+            "error",
+            "last"
+        ],
+        "sort-imports": "error",
+        "sort-keys": "off",
+        "sort-vars": "off",
+        "space-before-blocks": "error",
+        "space-before-function-paren": "off",
+        "space-in-parens": [
+            "error",
+            "never"
+        ],
+        "space-infix-ops": "error",
+        "space-unary-ops": "error",
+        "spaced-comment": "off",
+        "strict": [
+            "error",
+            "never"
+        ],
+        "switch-colon-spacing": "error",
+        "symbol-description": "error",
+        "template-curly-spacing": "error",
+        "template-tag-spacing": "error",
+        "unicode-bom": [
+            "error",
+            "never"
+        ],
+        "valid-jsdoc": "off",
+        "vars-on-top": "off",
+        "wrap-iife": "error",
+        "wrap-regex": "error",
+        "yield-star-spacing": "error",
+        "yoda": [
+            "error",
+            "never"
+        ]
+    }
+};

.npmignore

@@ -1 +1,2 @@
-demo
+demo
+.eslintrc.js

index.js

@@ -1,8 +1,12 @@
 (typeof navigator !== "undefined") && (function (window, factory) {
 	// Check require.js lib
+	// eslint-disable-next-line no-undef
 	if (typeof define === "function" && define.amd) {
+		// eslint-disable-next-line no-undef
 		define(function () { return factory(window) });
+		// eslint-disable-next-line no-undef
 	} else if (typeof module === "object" && module.exports) {
+		// eslint-disable-next-line no-undef
 		module.exports = factory(window);
 	} else {
 		window.animationTimeline = factory(window);
@@ -91,7 +95,7 @@
 	var denominators = [1, 2, 5, 10];
 	var clickDetectionMs = 120;
 
-	function getPixelRatio(ctx) {
+	function getPixelRatio() {
 		return 1;
 	}
 
@@ -188,7 +192,7 @@
 	}
 
 	function getPowArgument(toCheck) {
-		if (!toCheck || toCheck === 0) {
+		if (!toCheck || toCheck === 0 || !isFinite(toCheck)) {
 			return 1;
 		}
 		// some optimiazation for numbers:
@@ -202,14 +206,14 @@
 
 		toCheck = Math.abs(toCheck);
 		var category = 0;
-		var sign = sign(toCheck);
+		var s = sign(toCheck);
 		if (toCheck > 1) {
 			while (toCheck >= 1) {
 				toCheck = Math.floor(toCheck / 10.0);
 				category++;
 			}
 
-			return sign * category - 1;
+			return s * category - 1;
 		}
 		else if (toCheck > 0.0) {
 			// Get number of zeros before the number.
@@ -791,9 +795,8 @@
 				isChanged |= performSelection(false);
 
 				// change timeline pos:
-				var convertedVal = mousePosToVal(pos.x, true);
 				// Set current timeline position if it's not a drag or selection rect small or fast click.
-				isChanged |= setTimeInternal(convertedVal, 'user');
+				isChanged |= setTimeInternal(mousePosToVal(pos.x, true), 'user');
 			}
 
 			return isChanged;
@@ -1142,12 +1145,20 @@
 			var from = pxToVal(0);
 			var to = pxToVal(areaWidth);
 			var dist = getDistance(from, to);
+			if (dist === 0) {
+				return;
+			}
+
 			// normalize step.			
 			var stepsCanFit = areaWidth / options.stepPx;
 			var realStep = dist / stepsCanFit;
 			// Find the nearest 'beautiful' step for a gauge. This step should be devided by 1/2/5!
 			//var step = realStep;
 			var step = findGoodStep(realStep);
+			if (step == 0 || isNaN(step) || !isFinite(step)) {
+				return;
+			}
+
 			var goodStepDistancePx = areaWidth / (dist / step);
 			var smallStepsCanFit = goodStepDistancePx / options.stepSmallPx;
 			var realSmallStep = step / smallStepsCanFit;

package.json

@@ -1,6 +1,6 @@
 {
   "name": "animation-timeline-js",
-  "version": "1.2.3",
+  "version": "1.2.4",
   "description": "animation timeline control based on the canvas.",
   "main": "animation-timeline.js",
   "dependencies": {},