WPF Visifire图表控件使用基础

大家好，又见面了，我是你们的朋友全栈君。

https://www.cnblogs.com/wyuan/archive/2012/07/22/WPF.html

引言：

　　由于项目中需要使用Visifire所以自己就写了一些demo，大家一起共享！

基础Visifire图表的展示

1.Visifire的创建需要引用的DLL包【WPFToolkit.dll;WPFVisifire.Charts;WPFVisifire.Gauges(这个以后会用到)】

2.我们开始创建简单的Visifire图表

第一步：前台代码

<Window x:Class="Wpf_Tray.VisifireWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:vc="clr-namespace:Visifire.Charts;assembly=WPFVisifire.Charts" Title="VisifireWindow" Height="378" Width="536" WindowStartupLocation="CenterScreen">
    <Grid Name="LayoutRoot">
      <vc:Chart Name="chart" DockPanel.Dock="Left" Margin="0,40,0,2" />
      <Button Content="showChartData" Height="23" HorizontalAlignment="Left" Margin="24,8,0,0" Name="btn_showChartData" VerticalAlignment="Top" Width="97" Click="btn_showChartData_Click" />
       <Button Content="ExportToPng" Height="23" HorizontalAlignment="Left" Margin="134,8,0,0" Name="btn_ExportToPng" VerticalAlignment="Top" Width="88" Click="btn_ExportToPng_Click" />
        <Button Content="ExportChart" Height="23" HorizontalAlignment="Left" Margin="233,8,0,0" Name="btn_ExportChart" Click="btn_ExportChart_Click" VerticalAlignment="Top" Width="75" />
    </Grid>
</Window>

写完后的一个显示效果，如图;
http://pic002.cnblogs.com/images/2012/368829/2012072216004293.png

第二步：

实现后台绑定数据，上代码：

/// <summary>
        /// 绑定数据
        /// </summary>
        private void BindData()
        {
            DataSet ds = DBSQLHelper.Search("select * from hospitalorg", null, CommandType.Text);
            BindChart(ds.Tables[0]);
        }

      public VisifireWindow()
        {
            InitializeComponent(); 
            BindData();
        }

http://pic002.cnblogs.com/images/2012/368829/2012072216483217.png

这是绑定一列的！

第三步：

如图，有三个按钮，‘showChartData’，‘ExportToPng’

1.showChartData，主要是多列数据绑定，实现效果如图：
http://pic002.cnblogs.com/images/2012/368829/2012072216592860.png

上代码：

#region 可以显示多列，绑定界面Chart

        private void BindMoreColumnChart(DataTable dtChart)
        {
            this.chart.Series.Clear();

            this.chart.AnimationEnabled = true;

            this.chart.View3D = true;

            DataSeries dataSeries = new DataSeries();

            dataSeries.RenderAs = RenderAs.Bar;

            dataSeries.LabelEnabled = true;

            dataSeries.LegendText = "最小值";//图例显示的信息

            dataSeries.LabelText = "#AxisXLabel, #YValue";

            DataPoint datapoint;

            for (int i = 0; i < dtChart.Rows.Count; i++)
            {

                datapoint = new DataPoint();

                datapoint.AxisXLabel = dtChart.Rows[i]["job_id"].ToString();

                datapoint.YValue = Convert.ToDouble(dtChart.Rows[i]["min_lvl"].ToString());

                dataSeries.DataPoints.Add(datapoint);

            }

            this.chart.Series.Add(dataSeries);




            DataSeries dataSeries1 = new DataSeries();

            dataSeries1.RenderAs = RenderAs.Bar;

            dataSeries1.LabelEnabled = true;

            DataPoint datapoint1;

            for (int i = 0; i < dtChart.Rows.Count; i++)
            {

                datapoint1 = new DataPoint();

                datapoint1.AxisXLabel = dtChart.Rows[i]["job_id"].ToString();

                datapoint1.YValue = Convert.ToDouble(dtChart.Rows[i]["max_lvl"].ToString());

                dataSeries1.DataPoints.Add(datapoint1);
            }

            dataSeries1.LegendText = "最大值";

            dataSeries1.LabelText = "#AxisXLabel, #YValue";

            this.chart.Series.Add(dataSeries1);

            this.chart.ShadowEnabled = true;
        }
        #endregion

2.ExportTopng，是将visifire当前实现的图表导成png，上代码:

#region ExportToPng
        /// <summary>
        /// ExportToPng
        /// </summary>
        /// <param name="path"></param>
        /// <param name="surface"></param>
        public void ExportToPng(Uri path,Visifire.Charts.Chart surface)
        {
            if (path == null) return;
            //Save current canvas transform 保存当前画布变换
            Transform transform = surface.LayoutTransform;
            //reset current transform (in case it is scaled or rotated) 重设当前画布（如果缩放或旋转）
            surface.LayoutTransform = null;
            //Create a render bitmap and push the surface to it 创建一个渲染位图和表面
            RenderTargetBitmap renderBitmap = new RenderTargetBitmap(
                (int)surface.Width,
                (int)surface.Height,
                96d, 96d,
                PixelFormats.Pbgra32);
            renderBitmap.Render(surface);
            // Create a file stream for saving image
            using (FileStream outStream = new FileStream(path.LocalPath,FileMode.Create))
            {
                //Use png encoder for our data
                PngBitmapEncoder encoder = new PngBitmapEncoder();
                // push the rendered bitmap to it
                encoder.Frames.Add(BitmapFrame.Create(renderBitmap));
                // save the data to the stream
                encoder.Save(outStream);
            }
            // Restore previously saved layout 恢复以前保存布局
            surface.LayoutTransform = transform;
        }
        #endregion

#region 将Visifire图表保存为图片 http://www.visifire.com/blog/page/15/

        private void btn_ExportToPng_Click(object sender, RoutedEventArgs e)
        {
            ExportToPng(new Uri("D:/Visifire.png"), this.chart);
        }
#endregion