angularJS结合canvas画图的实现

2020-11-27 来源：汇意旅游网
这篇文章主要介绍了angularJS结合canvas画图例子的方法,需要的朋友可以参考下
这里给大家分享一个angularJS结合canvas画图例子,效果非常不错，赞一个先。
<!DOCTYPE html>
<html ng-app="APP">
<head>
 <meta charset="UTF-8">
 <script src="http://cdn.bootcss.com/angular.js/1.3.0-beta.12/angular.min.js"></script>
</head>
<body ng-controller="MainCtrl">
 <!--
 界面的这个元素会被替换成canvas元素;
 -->
 <p ang:round:progress data-round-progress-model="roundProgressData"></p>
 <br>
 <input type="number" ng-model="roundProgressData.label"/>
 <script>
 //引用angular.directives-round-progress这个模块;
 var APP = angular.module('APP', ['angular.directives-round-progress']).
 controller('MainCtrl', function($scope) {
 $scope.roundProgressData = {
 //这个是初始化的数据;
 label: 11,
 percentage: 0.11
 }
 //通过监听scope下的这个roundProgressData属性, 对界面的canvas进行重绘;
 $scope.$watch('roundProgressData', function (newValue) {
 newValue.percentage = newValue.label / 100;
 }, true);
 });
 </script>
<script>
 /*!
 * AngularJS Round Progress Directive
 *
 * Copyright 2013 Stephane Begaudeau
 * Released under the MIT license
 */
angular.module('angular.directives-round-progress', []).directive('angRoundProgress', [function () {
 var compilationFunction = function (templateElement, templateAttributes, transclude) {
 if (templateElement.length === 1) {
 //初始化DOM模型, 包括初始化canvas等;
 var node = templateElement[0];
 var width = node.getAttribute('data-round-progress-width') || '400';
 var height = node.getAttribute('data-round-progress-height') || '400';
 var canvas = document.createElement('canvas');
 canvas.setAttribute('width', width);
 canvas.setAttribute('height', height);
 canvas.setAttribute('data-round-progress-model', node.getAttribute('data-round-progress-model'));
 //相当于demo, 替换原来的元素;
 node.parentNode.replaceChild(canvas, node);
 //各种配置;
 var outerCircleWidth = node.getAttribute('data-round-progress-outer-circle-width') || '20';
 var innerCircleWidth = node.getAttribute('data-round-progress-inner-circle-width') || '5';
 var outerCircleBackgroundColor = node.getAttribute('data-round-progress-outer-circle-background-color') || '#505769';
 var outerCircleForegroundColor = node.getAttribute('data-round-progress-outer-circle-foreground-color') || '#12eeb9';
 var innerCircleColor = node.getAttribute('data-round-progress-inner-circle-color') || '#505769';
 var labelColor = node.getAttribute('data-round-progress-label-color') || '#12eeb9';
 var outerCircleRadius = node.getAttribute('data-round-progress-outer-circle-radius') || '100';
 var innerCircleRadius = node.getAttribute('data-round-progress-inner-circle-radius') || '70';
 var labelFont = node.getAttribute('data-round-progress-label-font') || '50pt Calibri';
 return {
 pre: function preLink(scope, instanceElement, instanceAttributes, controller) {
 var expression = canvas.getAttribute('data-round-progress-model');
 //监听模型, O了
 //就监听一个属性;
 scope.$watch(expression, function (newValue, oldValue) {
 // Create the content of the canvas
 //包括新建和重绘;
 var ctx = canvas.getContext('2d');
 ctx.clearRect(0, 0, width, height);
 // The "background" circle
 var x = width / 2;
 var y = height / 2;
 ctx.beginPath();
 ctx.arc(x, y, parseInt(outerCircleRadius), 0, Math.PI * 2, false);
 ctx.lineWidth = parseInt(outerCircleWidth);
 ctx.strokeStyle = outerCircleBackgroundColor;
 ctx.stroke();
 // The inner circle
 ctx.beginPath();
 ctx.arc(x, y, parseInt(innerCircleRadius), 0, Math.PI * 2, false);
 ctx.lineWidth = parseInt(innerCircleWidth);
 ctx.strokeStyle = innerCircleColor;
 ctx.stroke();
 // The inner number
 ctx.font = labelFont;
 ctx.textAlign = 'center';
 ctx.textBaseline = 'middle';
 ctx.fillStyle = labelColor;
 ctx.fillText(newValue.label, x, y);
 // The "foreground" circle
 var startAngle = - (Math.PI / 2);
 var endAngle = ((Math.PI * 2 ) * newValue.percentage) - (Math.PI / 2);
 var anticlockwise = false;
 ctx.beginPath();
 ctx.arc(x, y, parseInt(outerCircleRadius), startAngle, endAngle, anticlockwise);
 ctx.lineWidth = parseInt(outerCircleWidth);
 ctx.strokeStyle = outerCircleForegroundColor;
 ctx.stroke();
 }, true);
 },
 post: function postLink(scope, instanceElement, instanceAttributes, controller) {}
 };
 }
 };
 var roundProgress = {
 //compile里面先对dom进行操作, 再对$socpe进行监听;
 compile: compilationFunction,
 replace: true
 };
 return roundProgress;
}]);
</script>
</body>
</html>
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angularJS结合canvas画图的实现
