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index.html
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<!DOCTYPE html>
<html ng-app="myApp">
<head>
<title>Calculate area using points</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.25/angular.min.js"></script>
<script type="text/javascript" src="controller.js"></script>
<link rel="stylesheet" type="text/css" href="style.css">
</head>
<body>
<div ng-controller="Form">
<h1 align="center">Enter Co-ordinates</h1>
<form>
<div class="form-group" id="myForm" align="center">
<fieldset data-ng-repeat="point in points">
<input type="number" step="0.01" ng-model="point.x" placeholder="x co-ordinate"></input>
<input type="number" step="0.01" ng-model="point.y" placeholder="y co-ordinate"></input>
<button class="remove" ng-if="points.length > 3" ng-show="$last" ng-click="removeField()">-</button>
</fieldset>
<br/>
<label for="favcolor"> Color:
<input type="color" name="favcolor" value="#ff0000" ng-model="color">
<br/><br/>
<button class="btn btn-default" ng-click="addNewField()">Add a new set of co-ordinates</button>
<button class="btn btn-default" ng-click="calculateAndRenderArea()">Calculate and render area</button>
<button class="btn btn-default" ng-click="clearCanvas()">Clear</button>
</div>
</form>
<div id="">
<h3 class="area" ng-show="area!=null" align="center">Area: {{ area }} units</h3>
</div>
</div>
<canvas id="canvas" class="canvas" height="200" width="200"></canvas>
</body>
</html>