angularJS结合canvas实现的画图代码实例

2023-12-04 13:40:02 前端笔记 71

本章节介绍分享一段代码实例，它实现angularJS结合canvas实现作图效果。

代码实例:

<!DOCTYPE html> 
<html> 
<head> 
<meta charset=" utf-8"> 
<meta name="author" content="/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;-->
<div ang:round:progress data-round-progress-model="roundProgressData"></div>
<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>