欢迎您访问程序员文章站本站旨在为大家提供分享程序员计算机编程知识!
您现在的位置是: 首页

Open Flash Chart2应用(实现flash另存为图片) 博客分类: opensource Open Flash Chart2统计图json企业应用 

程序员文章站 2024-03-20 09:02:40
...
    blog迁移至:http://www.micmiu.com

    Open Flash Chart2 与1.x版本最大不同之处在于可以把数据格式改成JSON,可以很方便的运用Ajax实现动态加载数据,
同时可以把生成的flash保存成图片(这个功能很实用)。
    下面图文并茂一步一步详细介绍Open Flash Chart2的应用。
一、官网及相关下载的网站本文附件也提供了一份已经整理好的下载,见附近ofc2相关组件

二、HTML页面用JSON数据直接生成flash。
<html>
<head>
<script type="text/javascript" src="ofc2/json2.js"></script>
<script type="text/javascript" src="ofc2/swfobject.js"></script>
</head>
<body>
<h2>页面直接生成flash</h2>
<div id="my_chart"></div>
</body>
<script type="text/javascript">
swfobject.embedSWF("ofc2/open-flash-chart.swf", "my_chart",
  "400", "300", "9.0.0", "expressInstall.swf",
  {"get-data":"getDemoData"});
function getDemoData(){
	var barData={
		"y_axis":{"max":26,"steps":2.5},
		"title":{"text":"每周水果产量"},
		"is_decimal_separator_comma":0,
		"elements":[{"values":[
							{"colour":"0x336699","tip":"16.0 吨 ","top":16},
							{"colour":"0x336699","tip":"8.0 吨 ","top":8},
							{"colour":"0x336699","tip":"18.0 吨 ","top":18},
							{"colour":"0x336699","tip":"12.0 吨 ","top":12},
							{"colour":"0x336699","tip":"16.0 吨 ","top":16},
							{"colour":"0x336699","tip":"24.0 吨 ","top":24},
							{"colour":"0x336699","tip":"6.0 吨 ","top":6}
						],
					"type":"bar_glass"}
					],
		"num_decimals":2,
		"is_fixed_num_decimals_forced":0,
		"x_axis":{"labels":{"labels":["星期1","星期2","星期3","星期4","星期5","星期6","星期日"]}},
		"is_thousand_separator_disabled":0
	};
   return JSON.stringify(barData);
}

</script>
</html>

效果如下图:

Open Flash Chart2应用(实现flash另存为图片)
            
    
    博客分类: opensource Open Flash Chart2统计图json企业应用 

三、页面Ajax动态读取数据生成flash。
  java类中用到了jofc2-1.0-0.jar这个类
<%@ page language="java" contentType="text/html; charset=UTF-8"%>
<html>
<head>
<link href="common/common.css" type="text/css" rel="stylesheet">
<script type="text/javascript" src="ofc2/swfobject.js"></script>
</head>
<body>
<table width="100%">
	<tr>
		<td>
		<h2>Ajax动态读取数据生成flash</h2>
		</td>
	</tr>
	<tr>
		<td>
		<div id="ofc2_bar01"></div>
		</td>
	</tr>
</table>

</body>
<script type="text/javascript">
swfobject.embedSWF(
	"ofc2/open-flash-chart.swf", 
	"ofc2_bar01", 
	"400", 
	"300", 
	"9.0.0",
	"expressInstall.swf",
	{"data-file":"DrawOfc2ChartMainAction.do?method=getDrawBarData"},
	{wmode:"transparent"}
);
</script>
</html>

/**
 * Open flash chart 2
 * @author Michael sun
 */
public class DrawOfc2ChartMainAction extends DispatchAction {
    /**
     * draw chart
     * @param mapping struts mapping
     * @param form struts form
     * @param request http request
     * @param response http response
     * @return action forward
     * @throws Exception any execption
     */
    public ActionForward getDrawBarData(ActionMapping mapping, ActionForm form,
            HttpServletRequest request, HttpServletResponse response)
            throws Exception {

        response.setContentType("application/json");
        response.setHeader("Cache-Control", "no-cache");
        response.setCharacterEncoding("UTF-8");
        PrintWriter out = response.getWriter();

        Map<String, Double> dataMap = new LinkedHashMap<String, Double>();
        dataMap.put("1", 16d);
        dataMap.put("2", 8d);
        dataMap.put("3", 18d);
        dataMap.put("4", 12d);
        dataMap.put("5", 16d);
        dataMap.put("6", 24d);
        dataMap.put("日", 6d);

        Chart ofc2Chart = new Chart();
        Text title = new Text("每周水果产量");
        ofc2Chart.setTitle(title);

        BarChart barChart = new BarChart(BarChart.Style.GLASS); // 设置条状图样式

        double ymax = 25d; // //Y 轴最大值
        XAxis x = new XAxis(); // X 轴
        for (Entry<String, Double> entry : dataMap.entrySet()) {
            x.addLabels("星期" + entry.getKey()); // x 轴的文字
            Bar bar = new Bar(entry.getValue(), " 吨 ");
            bar.setColour("0x336699"); // 颜色
            bar.setTooltip(entry.getValue() + " 吨 "); // 鼠标移动上去后的提示
            barChart.addBars(bar); // 条标题,显示在 x 轴上

        }
        ofc2Chart.addElements(barChart);
        ofc2Chart.setXAxis(x);

        YAxis y = new YAxis(); // y 轴
        y.setMax(ymax + 1.0); // y 轴最大值
        y.setSteps(ymax / 10); // y 轴步进
        ofc2Chart.setYAxis(y);

        String jsonChart = ofc2Chart.toString();
        out.write(jsonChart);
        out.close();
        return null;
    }

}

效果图如下:

Open Flash Chart2应用(实现flash另存为图片)
            
    
    博客分类: opensource Open Flash Chart2统计图json企业应用 

四、通过javascript把flash保存成图片。
下面介绍如何将生成的flash另存为图片,一般情况下我们运用js就可以直接在页面生产图片,
由于IE6、IE7 不支持base64编码图片显示,之后将介绍其他方法
当然不是必须要用这些JS库(jQuery 或prototype)才能完成这个功能,如果你不喜欢用这些JS库,也可以自己写的。
1.jQuery 的实现
<%@ page language="java" contentType="text/html; charset=UTF-8"%>
<html>
<head>
<link href="common/common.css" type="text/css" rel="stylesheet">
<script type="text/javascript" src="common/jquery-1.3.2.js"></script>
<script type="text/javascript" src="ofc2/swfobject.js"></script>
</head>
<body>
<table width="900">
	<tr>
		<td>
		<p>这是flash</p>
		<div id="ofc2_bar01"></div>
		</td>
		<td>
		<p>这是图片</p>
		<div id="img_chart_1"></div>
		</td>
	</tr>
	<tr>
		<td colspan="2"><input type="button" name="btncopy"
			onclick="OFC.jquery.rasterize('ofc2_bar01', 'img_chart_1')"
			value="生成图片"></td>
	</tr>
</table>

</body>
<script type="text/javascript">
swfobject.embedSWF(
	"ofc2/open-flash-chart.swf", 
	"ofc2_bar01", 
	"300", 
	"300", 
	"10.0.0",
	"expressInstall.swf",
	{"data-file":"DrawOfc2ChartMainAction.do?method=getDrawBarData"},
	{wmode:"transparent"}
);
</script>
<script type="text/javascript">
 
OFC = {};
 
OFC.jquery = {
    name: "jQuery",
    version: function(src) { return $('#'+ src)[0].get_version() },
    rasterize: function (src, dst) { $('#'+ dst).replaceWith(OFC.jquery.image(src)) },
    image: function(src) { return "<img src='data:image/png;base64," + $('#'+src)[0].get_img_binary() + "' />"},
    popup: function(src) {
        var img_win = window.open('', 'Image')
        with(img_win.document) {
            write('<html><head><title>Charts: Export as Image</title></head><body>' + OFC.jquery.image(src) + '</body></html>') }
		// stop the 'loading...' message
		img_win.document.close();
     }
}
 
// Using an object as namespaces is JS Best Practice. I like the Control.XXX style.
//if (!Control) {var Control = {}}
//if (typeof(Control == "undefined")) {var Control = {}}
if (typeof(Control == "undefined")) {var Control = {OFC: OFC.jquery}}
 
// By default, right-clicking on OFC and choosing "save image locally" calls this function.
// You are free to change the code in OFC and call my wrapper (Control.OFC.your_favorite_save_method)
// function save_image() { alert(1); Control.OFC.popup('my_chart') }
function save_image() { alert(1); OFC.jquery.popup('ofc2_bar01') }
function moo() { alert(99); };
</script>
</html>

点击页面上生成图片按钮后会在页面的右侧生成一张图片,如图:

Open Flash Chart2应用(实现flash另存为图片)
            
    
    博客分类: opensource Open Flash Chart2统计图json企业应用 

2.prototype 的实现
  把相应的JS和按钮的onclick 函数改写下就可以了
<script type="text/javascript">
OFC = {}
OFC.prototype = {
    name: "Prototype",
    version: function(src) { return $(src).get_version() },
    rasterize: function (src, dst) { $(dst).replace(new Element("img", {src: Control.OFC.image(src)})) },
    image: function(src) {return "data:image/png;base64," + $(src).get_img_binary()},
    popup: function(src) {
        var img_win = window.open('', 'Image')
        with(img_win.document) {
            write("<html><head><title>Charts: Export as Image</title></head><body><img src='" + Control.OFC.image(src) + "' /></body></html>") }
     }
}
// Using an object as namespaces is JS Best Practice. I like the Control.XXX style.
if (typeof(Control == "undefined")) {var Control = {OFC: OFC.prototype}}
//if (!Control) {var Control = {}}
// By default, right-clicking on OFC and choosing "save image locally" calls this function.
// You are free to change the code in OFC and call my wrapper (Control.OFC.your_favorite_save_method)
function save_image() { Control.OFC.popup('ofc2_bar01') }
</script>

3.不要任何JS库
   只要把相应的JS和按钮的onclick 函数改写下就可以了
<script type="text/javascript">
OFC = {}
OFC.none = {
    name: "pure DOM",
    version: function(src) { return document.getElementById(src).get_version() },
    rasterize: function (src, dst) {
      var _dst = document.getElementById(dst)
      e = document.createElement("div")
      e.innerHTML = Control.OFC.image(src)
      _dst.parentNode.replaceChild(e, _dst);
    },
    image: function(src) {return "<img src='data:image/png;base64," + document.getElementById(src).get_img_binary() + "' />"},
    popup: function(src) {
        var img_win = window.open('', 'Image')
        with(img_win.document) {
            write("<html><head><title>Charts: Export as Image</title></head><body>" + Control.OFC.image(src) + "</body></html>") }
     }
}
if (typeof(Control == "undefined")) {var Control = {OFC: OFC.none}}
function save_image() { Control.OFC.popup('ofc2_bar01') }

</script>


另打开页面显示图片:在生成flash右击,选中Save Image locally 如下图

Open Flash Chart2应用(实现flash另存为图片)
            
    
    博客分类: opensource Open Flash Chart2统计图json企业应用 

由于IE6、IE7不支持base64码,如果要在IE6、IE7中兼容,可以将图片的base64码post到服务器,然后利用服务端生成图片,再将文件流在返回给浏览器(类似图片下载的方法),具体如下:
 /**
     * upload img
     * @param mapping struts mapping
     * @param form struts form
     * @param request http request
     * @param response http response
     * @return action forward
     * @throws Exception any execption
     */
    public ActionForward exportImg(ActionMapping mapping, ActionForm form,
            HttpServletRequest request, HttpServletResponse response)
            throws Exception {
        String imgBase64Code = request.getParameter("imgBase64Code");

        response.setContentType("image/PNG;charset=UTF-8");
        response.setHeader("Content-disposition", "attachment; filename="
                + new String("flashExport.png".getBytes(), "iso-8859-1"));
        this.createImg(response.getOutputStream(), imgBase64Code);
        return null;
    }

    /**
     * 
     * @param os
     * @param base64Code
     */
    private void createImg(OutputStream os, String base64Code) {
        BASE64Decoder decoder = new BASE64Decoder();
        try {
            byte[] b = decoder.decodeBuffer(base64Code);
            for (int i = 0; i < b.length; ++i) {
                if (b[i] < 0) {
                    b[i] += 256;
                }
            }

            os.write(b);

        } catch (Exception e) {
            logger.error(" create img error:", e);
        }
    }
  • Open Flash Chart2应用(实现flash另存为图片)
            
    
    博客分类: opensource Open Flash Chart2统计图json企业应用 
  • 大小: 31.4 KB
  • Open Flash Chart2应用(实现flash另存为图片)
            
    
    博客分类: opensource Open Flash Chart2统计图json企业应用 
  • 大小: 29.2 KB
  • Open Flash Chart2应用(实现flash另存为图片)
            
    
    博客分类: opensource Open Flash Chart2统计图json企业应用 
  • 大小: 57.2 KB
  • Open Flash Chart2应用(实现flash另存为图片)
            
    
    博客分类: opensource Open Flash Chart2统计图json企业应用 
  • 大小: 20.2 KB