Dojo Chart之经常使用统计图

非常多做web的都知道，在非常多web系统中会涉及到一些统计图。比如饼状图，柱状图、趋势图、以及叠加图等。提到这儿，做web的都非常熟悉的，jquery的highcharts就能搞定全部的涉及到统计图的功能，highcharts我自己也在经经常使用，可是呢，用过arcgis for javascript的同志们深深地知道，arcgis的那一套选择的是dojo，并不能非常好的与jquery结合使用，所以，还得回归到dojo上面去。

dojo的统计图功能，也非常强大的，前两篇博文对dojo的统计图做了一定的说明，就算入个门，在本节，重点讲述在地图中常见的统计图的实现方式。

dojo的统计图表在dojox/charting以下。

1、柱状图

在dojo中实现柱状图有两种。一种是横着的，为Bars，一种是竖着的，为Columns。其分别位于dojox/charting/plot2d/Bars和dojox/charting/plot2d/Columns以下。

事实上现方式为：

    <script>
        require([
            "dojox/charting/Chart2D",
            "dojox/charting/plot2d/ClusteredBars",
            "dojox/charting/plot2d/ClusteredColumns",
            "dojox/charting/plot2d/Bars",
            "dojox/charting/plot2d/Columns",
            "dojox/charting/axis2d/Default",
            "dojo/domReady!"
        ], function(
            Chart2D
        ){
            var chartData = [14000,9200,11811,12000,8662,12000,8668];
            var chart = new Chart2D("barchart");
            chart.addPlot("default", {
                type: type,//Bars或者Colums
                gap: 8
            });
            var  xStr = ["周一","周二","周三","周四","周五","周六","周日"];
            // Add axes
            var myLabelFunc = function(text, value, precision){
                return xStr[text-1];
            };
            chart.addAxis("x", { labelFunc: myLabelFunc });
            chart.addAxis("y", { vertical:true, fixLower: "major", fixUpper: "major" });
            chart.addSeries("usa",chartData);
            chart.render();
        });
    </script>

上述代码实现的结果为：

Bars

Columns

Bars和Columns实现的仅仅是这样的仅仅有一个series的。假设图表中有多个series，我们得用ClusteredBars和ClusteredColumns，聚类柱状图。该类柱状图分别位于dojox/charting/plot2d/ClusteredBars和dojox/charting/plot2d/ClusteredColumns以下。事实上现方式与上述柱状图的实现方式类似，例如以下：

    <script>
        require([
            "dojox/charting/Chart2D",
            "dojox/charting/plot2d/ClusteredBars",
            "dojox/charting/plot2d/ClusteredColumns",
            "dojox/charting/plot2d/Bars",
            "dojox/charting/plot2d/Columns",
            "dojox/charting/axis2d/Default",
            "dojo/domReady!"
        ], function(
            Chart2D
        ){
            var chartData1 = [14000,9200,11811,12000,8662,12000,8668];
            var chartData2 = [2000,4440,4000,5987,4567,5677,5678];
            var chart = new Chart2D("barchart");
            chart.addPlot("default", {
                type: type,
                gap: 8
            });
            var  xStr = ["周一","周二","周三","周四","周五","周六","周日"];
            // Add axes
            var myLabelFunc = function(text, value, precision){
                return xStr[text-1];
            };
            chart.addAxis("x", { labelFunc: myLabelFunc });
            chart.addAxis("y", { vertical:true, fixLower: "major", fixUpper: "major" });
            chart.addSeries("Series1",chartData1);
            chart.addSeries("Series2",chartData2);
            chart.render();
        });
    </script>

上述代码实现的效果例如以下：

聚类Bars

聚类Colums

2、饼状图

相对于柱状图，饼状图是比較简单的，位于dojox/charting/plot2d/Pie以下。实现方式例如以下：

    <script type="text/javascript">
        require([
            "dojox/charting/Chart2D",
            "dojox/charting/plot2d/Pie",
            "dojox/charting/themes/PlotKit/blue",
            "dojo/domReady!"
        ], function(
                Chart2D,
                Pie,
                theme
                ){
            var chartData=[
                {y: 10, text: "服装", color: "powderblue", stroke: "black", tooltip:"服装：" + 10+ "(" + 6 + "%)"},
                { y: 20, text: "电器", color: "cadetblue", stroke: "black", tooltip: "电器: " + 20 + " (" + 13 + "%)" },
                { y: 30, text: "百货", color: "cornflowerblue", stroke: "black", tooltip: "百货: " + 30 + " (" + 20 + "%)" },
                { y: 40, text: "建材", color: "lightsteelblue", stroke: "black", tooltip: "建材: " + 40 + " (" + 26 + "%)" },
                { y: 50, text: "其它", color: "dodgerblue", stroke: "black", tooltip: "其它:" + 50 + " (" + 33 + "%)"}
            ];

            var chart1 = new dojox.charting.Chart2D("test1",{
                title: "销售比例图",
                titlePos: "top",
                titleGap: 25,
                titleFont: "normal normal normal 10pt Arial",
                titleFontColor: "orange"
            });
            chart1.setTheme(dojox.charting.themes.PlotKit.blue);
            chart1.addPlot("default", {
                type: "Pie",
                font: "normal normal bold 12pt Tahoma",
                fontColor: "white",
                labelOffset: 40
            });
            chart1.addSeries("Series A", chartData);
            chart1.render();
        });
    </script>

上述代码的实现效果为：

饼状图

3、线状图

相对来说，线状图的实现也比較简单，位于dojox/charting/plot2d/Lines以下。实现代码例如以下：

    <script type="text/javascript">
        require([
            "dojox/charting/Chart2D",
            "dojox/charting/plot2d/Lines",
            "dojox/charting/plot2d/StackedAreas",
            "dojox/charting/themes/PlotKit/blue",
            "dojox/charting/action2d/Highlight",
            "dojox/charting/action2d/Tooltip",
            "dojox/charting/action2d/MoveSlice" ,
            "dojox/charting/widget/Legend",
            "dojo/domReady!"
        ], function(
                Chart2D,
                Lines,
                StackedAreas,
                theme,
                Highlight,
                Tooltip,
                MoveSlice,
                Legend
             )
        {
            var chartData = [14000,9200,11811,12000,8662,12000,8662];
            var chartData1 = [20000,13000,4000,5000,6000,7008,8000];
            var chart1 = new dojox.charting.Chart2D("chart");
            chart1.setTheme(dojox.charting.themes.PlotKit.blue);
            chart1.addPlot("default", {
                type: "Lines",
                markers:true,
                tension:"S"
            });

            var  xStr = ["周一","周二","周三","周四","周五","周六","周日"];
            var myLabelFunc = function(text, value, precision){
                return xStr[text-1];
            };
            chart1.addAxis("x", { labelFunc: myLabelFunc });
            chart1.addAxis("y", { vertical:true, fixLower: "major", fixUpper: "major" });
            chart1.addSeries("china",chartData, {stroke: {color: "#5782AE"}, fill: "#5782AE"});
            chart1.addSeries("usa",chartData1, {stroke: {color: "#000066"}, fill: "#000066"});
            chart1.render();
        });
    </script>

看代码。线状图的实现方式和柱状图一样，注意，线状图在addPlot的时候，里面有一个參数markers，这个參数设置的是数据点是否显示。显示的效果例如以下：

显示数据点

不显示数据点

4、区域图

区域图也是一个比較常见的统计图之中的一个，位于dojox/charting/plot2d/Areas以下，事实上现代码例如以下：

    <script type="text/javascript">
        require([
            "dojox/charting/Chart2D",
            "dojox/charting/plot2d/Lines",
            "dojox/charting/plot2d/Areas",
            "dojox/charting/themes/PlotKit/blue",
            "dojox/charting/action2d/Highlight",
            "dojox/charting/action2d/Tooltip",
            "dojox/charting/action2d/MoveSlice" ,
            "dojox/charting/widget/Legend",
            "dojo/domReady!"
        ], function(
                Chart2D,
                Lines,
                Areas,
                theme,
                Highlight,
                Tooltip,
                MoveSlice,
                Legend
             )
        {
            var chartData = [14000,9200,11811,12000,8662,12000,8662];
            var chartData1 = [20000,13000,4000,5000,6000,7008,8000];
            var chart1 = new dojox.charting.Chart2D("chart");
            chart1.setTheme(dojox.charting.themes.PlotKit.blue);
            chart1.addPlot("default", {
                type: "Areas",
                markers:true,
                tension:"S"
            });

            var  xStr = ["周一","周二","周三","周四","周五","周六","周日"];
            var myLabelFunc = function(text, value, precision){
                return xStr[text-1];
            };
            chart1.addAxis("x", { labelFunc: myLabelFunc });
            chart1.addAxis("y", { vertical:true, fixLower: "major", fixUpper: "major" });
            chart1.addSeries("china",chartData, {stroke: {color: "#5782AE"}, fill: "#5782AE"});
            chart1.render();
        });
    </script>

5、堆积图

堆积图在dojo里面能够实现非常多种类型的，分别为堆积图、堆积区域图、堆积柱状图、堆积线状图。堆积图的实现与各相相应图差点儿相同。以下以堆积柱状图为例，看看堆积图的实现方式：

    <script type="text/javascript">
        require(["dojox/charting/Chart",
            "dojox/charting/axis2d/Default",
            "dojox/charting/plot2d/StackedColumns",
            "dojox/charting/themes/Wetland" ,
            "dojo/domReady!"
        ],
        function(Chart, Default, StackedColumns, Wetland){
            var chart = new Chart("chart");
            chart.addPlot("default",
                    {
                        type: "StackedColumns",
                        gap: 8
                    }
            );
            chart.addAxis("x", {fixLower: "major", fixUpper: "major"});
            chart.addAxis("y", {vertical: true, fixLower: "major", fixUpper: "major", min: 0});
            chart.setTheme(Wetland);
            chart.addSeries("Series A", [1, 2, 0.5, 1.5, 1, 2.8, 0.4]);
            chart.addSeries("Series B", [2.6, 1.8, 2, 1, 1.4, 0.7, 2]);
            chart.addSeries("Series C", [6.3, 1.8, 3, 0.5, 4.4, 2.7, 2]);
            chart.render();
        });
    </script>

实现的效果例如以下：

堆积柱状图

此外，dojo还有别的统计图，在此就不在作介绍，后面还会继续介绍。还望后面继续关注。