Home > Article > Web Front-end > Implementation of angularJS combined with canvas drawing
Implementation of angularJS combined with canvas drawing
- 不言Original
- 2018-06-22 14:27:272926browse
This article mainly introduces the method of angularJS combined with canvas drawing examples. Friends who need it can refer to it.
Here I will share with you an angularJS combined with canvas drawing example. The effect is very good. Please give it a thumbs up.
<!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>The above is the entire content of this article. I hope it will be helpful to everyone's study. For more related content, please pay attention to the PHP Chinese website!
Related recommendations:
Detailed examples of the combined use of angularjs and ajax_AngularJS
Telling about Canvas combined with JavaScript to achieve image special effects
Javascript combined with Canvas to implement a simple circular clock_javascript skills
# #
The above is the detailed content of Implementation of angularJS combined with canvas drawing. For more information, please follow other related articles on the PHP Chinese website!
Statement：
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn