diff --git a/utils/combat-sim/app.js b/utils/combat-sim/app.js
new file mode 100644
index 000000000..691a41c96
--- /dev/null
+++ b/utils/combat-sim/app.js
@@ -0,0 +1,138 @@
+var app = angular.module('app', ['nvd3']);
+
+app.controller('MainCtrl', function($scope, $interval) {
+ $scope.options = {
+ chart: {
+ type: 'discreteBarChart',
+ height: 450,
+ margin: {
+ top: 20,
+ right: 20,
+ bottom: 50,
+ left: 55
+ },
+ x: function(d) {
+ return d.label;
+ },
+ y: function(d) {
+ return d.value + (1e-10);
+ },
+ showValues: true,
+ valueFormat: function(d) {
+ return d3.format(',.2r')(d);
+ },
+ duration: 500,
+ xAxis: {
+ axisLabel: 'D1-D20'
+ },
+ yAxis: {
+ axisLabel: 'Count'
+ }
+ }
+ };
+
+ $scope.offense = 100;
+ $scope.defense = 100;
+
+ $scope.data = [{
+ key: "Cumulative Return",
+ values: []
+ }];
+
+ for (var i = 0; i < 20; ++i) {
+ var value = {
+ "label": i + 1,
+ "value": 0
+ };
+ $scope.data[0].values.push(value);
+ }
+
+ function addRoll(interval) {
+ $scope.data[0].values[interval - 1].value += 1;
+ }
+
+ var stop;
+ $scope.clearData = function() {
+ console.log('Clearing data');
+ for (var i = 0; i < 20; ++i) {
+ $scope.data[0].values[i].value = 0;
+ }
+ };
+
+ $scope.start = function() {
+ if (angular.isDefined(stop))
+ return;
+
+ stop = $interval(doCombatRound, 100);
+ };
+
+ $scope.stop = function() {
+ if (angular.isDefined(stop)) {
+ $interval.cancel(stop);
+ stop = undefined;
+ }
+ };
+
+ $scope.$on('$destroy', function() {
+ $scope.stop();
+ });
+
+ function getRandomInt(min, max) {
+ min = Math.ceil(min);
+ max = Math.floor(max);
+ return Math.floor(Math.random() * (max - min)) + min;
+ }
+
+ function getRandom(min, max) {
+ return Math.random() * (max - min) + min;
+ }
+
+ function addChance(bucket, chance, value) {
+ for (var i = 0; i < chance; ++i) {
+ bucket.push(value);
+ }
+ }
+
+ function doCombatRound() {
+ var offense = $scope.offense;
+ var defense = $scope.defense;
+ defense = defense - ((defense - offense) / 2.0);
+ var diff = offense - defense;
+ var mean = 0.0;
+ var mult1 = 0.0;
+ var mult2 = 0.0;
+
+ if (offense > 30.0) {
+ mult1 = offense / 200.0 + 25.75;
+ if ((defense / offense) < 0.35) {
+ mult1 = mult1 + 1.0;
+ } else if ((defense / offense) > 0.65) {
+ mult1 = mult1 - 1.0;
+ }
+ mult2 = offense / 140 + 18.5;
+ } else {
+ mult1 = 11.5 + offense / 2.0;
+ mult2 = 14.0 + offense / 6.0;
+ }
+
+ if (offense > defense) {
+ mean = diff / offense * mult1;
+ } else if (defense > offense) {
+ mean = diff / defense * mult2;
+ }
+
+ var stddev = 8.8;
+ var theta = 2 * Math.PI * getRandom(0.0, 1.0);
+ var rho = Math.sqrt(-2 * Math.log(1 - getRandom(0.0, 1.0)));
+ var d = mean + stddev * rho * Math.cos(theta);
+
+ if (d < -9.5) {
+ d = -9.5;
+ } else if (d > 9.5) {
+ d = 9.5;
+ }
+ d = d + 11;
+ addRoll(parseInt(d));
+ };
+});
+
diff --git a/utils/combat-sim/index.html b/utils/combat-sim/index.html
new file mode 100644
index 000000000..783177051
--- /dev/null
+++ b/utils/combat-sim/index.html
@@ -0,0 +1,30 @@
+
+
+
+
+ Combat Visualization
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
diff --git a/utils/combat-sim/style.css b/utils/combat-sim/style.css
new file mode 100644
index 000000000..c427aa7f4
--- /dev/null
+++ b/utils/combat-sim/style.css
@@ -0,0 +1,3 @@
+.input-row {
+ padding: 8px;
+}
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