WPF Visifire图表控件使用基础

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

【这只是基础，visifire官方网站的文档进行学习，http//www.visifire.com/】