Nplot的用法

NPlot的基本用法

1、NPlot的基本用法

图表控件一直是很难找的，特别是免费又强大的。NPlot是一款非常难得的.Net平台下的图表控件，能做各种曲线图，柱状图，饼图，散点图，股票图等，而且它免费又开源，使用起来也非常符合程序员的习惯。唯一的缺点就是文档特别难找，难读。通过对其文档的阅读和对示例程序源代码的分析，现在将NPlot的基本概念整理如下： NPlot的命名空间包括

NPlot,NPlot.Bitmap,NPlot.Web,NPlot.Web.Design,NPlot.Windows等，其中最核心的，管理各种图表的类都属于NPlot命名空间，NPlot.Bitmap针对位图的管理，

NPlot.Web,NPlot.Web.Design和NPlot.Windows则可视为NPlot图表在Web Form和Windows Form上的容器(PlotSurface2D)。这些容器可以拖到Form上，也可以位于其他容器之中。要在应用程序中应用NPlot控件，首先要把所下载的NPlot.dll添加到.Net工程中。并将其添加到工具箱托盘中。添加方式为：在工具箱上单击右键，选择“选择项”，会出现“选择工具箱项”对话框，在“.Net Frameworks组件”属性页，选择浏览，找到NPlot.dll添加到工具箱项。这时工具箱中会出现NPlot控件。在设计应用程序界面时，可以将其拖入应用程序界面，系统会在代码中自动创建一个PlotSurface2D对象。

PlotSurface2D对象是NPlot图表的容器，所有的图表图形，坐标，标题（都继承IDrawable接口）等各种信息都可以被加入PlotSurface2D。PlotSurface2D拥有一个非常重要的方法：Add。各种图表图形，坐标，标题都可以通过Add加入PlotSurface2D对象,plot:为控件名称,并引入空间：using NPlot;我们可以通过下面简单的代码示例来了解NPlot的基本用法： public void plotline() {

// --- Plotting --- plot.Clear(); // --- Grid Code ---

Grid mygrid = new Grid();

mygrid.HorizontalGridType = Grid.GridType.None; mygrid.VerticalGridType = Grid.GridType.Fine; plot.Add(mygrid); plot.Title = \

StepPlot line = new StepPlot(); line.Pen = new Pen (Color.Red, 1);

line.OrdinateData = new int [] {0, 1, 0, 1, 1, 0}; line.HideVerticalSegments = false; plot.Add(line); plot.Refresh(); return; }

Grid对象和StepPlot对象都是NPlot命名空间中的对象，都继承于NPlot.IDrawable，都可以作为PlotSurface2D.Add函数调用，在NPlot中画图，就是把网格，坐标，图形等各种对象加入PlotSurface2D对象中，一切就那么简单！

NPlot的下载地址：http://netcontrols.org/nplot/wiki/index.php?n=Main.HomePage NPlot的开发文档：http://www.andrewtheken.com/nplot/

E_mail：kissyougoodby@163.com QQ:55774088 public void plotline(double[] x,double[] y) {

// --- Plotting --- plot.Clear(); // --- Grid Code --- Grid mygrid = new Grid();

mygrid.HorizontalGridType = Grid.GridType.None; mygrid.VerticalGridType = Grid.GridType.Fine; plot.Add(mygrid); plot.Title = \×××\ LinePlot lp = new LinePlot(); /////横坐标赋值

lp.AbscissaData = x;//new double[] { 0, 25,125 }; /////纵坐标赋值

lp.OrdinateData = y;//new double[] { 200, 200, 0};

//StepPlot line = new StepPlot(); //line.Pen = new Pen(Color.Red, 1);

//line.OrdinateData = new double[] { 5.5, 4.0, 1.5, 2.5, 3.5 }; //line.HideVerticalSegments = false; plot.Add(lp); plot.Refresh(); return; }

2、Nplot用法举例

myPlot.Clear();

//加入网格

Grid mygrid = new Grid(); myPlot.Add(mygrid); myPlot.Title = \测试\

LinePlot lp = new LinePlot();

double[] a = new double[] { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 }; string[] b = new string[] { \\

double[] ab = new double[] { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };

ArrayList dates = new ArrayList();

dates.Add(Convert.ToDateTime(\ dates.Add(Convert.ToDateTime(\ dates.Add(Convert.ToDateTime(\ dates.Add(Convert.ToDateTime(\

dates.Add(Convert.ToDateTime(\ dates.Add(Convert.ToDateTime(\ dates.Add(Convert.ToDateTime(\ dates.Add(Convert.ToDateTime(\ dates.Add(Convert.ToDateTime(\ dates.Add(Convert.ToDateTime(\ dates.Add(Convert.ToDateTime(\ dates.Add(Convert.ToDateTime(\ lp.AbscissaData = dates;

//柱状

BarPlot storeGrowth = new BarPlot(); storeGrowth.AbscissaData = dates; storeGrowth.OrdinateDataTop = a;

storeGrowth.OrdinateDataBottom = ab;

storeGrowth.FillBrush = NPlot.RectangleBrushes.Solid.Red; //storeGrowth.BorderPen = new Pen( Color.Black, 2.0f ); myPlot.Add(storeGrowth);

//标签

LabelPointPlot tp1 = new LabelPointPlot();

tp1.AbscissaData = dates; tp1.OrdinateData = a; tp1.TextData = b;

tp1.LabelTextPosition = LabelPointPlot.LabelPositions.Above; tp1.Marker = new Marker(Marker.MarkerType.None, 10); myPlot.Add(tp1);

//lp.

lp.DataSource = a;

lp.Pen = new Pen(Color.Blue, 3.0f); lp.Label = \ myPlot.Add(lp);

myPlot.XAxis1.Label = \时间\ myPlot.YAxis1.Label = \次数\

//myPlot.XAxis1.WorldLength = 60 * 60 * 24;

//设置网格距离

//myPlot.XAxis1.WorldMin += myPlot.XAxis1.WorldLength/ 12;//WorldLength=n*24*60*60;

//myPlot.XAxis1.WorldMax -= myPlot.XAxis1.WorldLength / 2;

//myPlot.XAxis1.

//myPlot.XAxis1.WorldLength = 10; //myPlot.

//让日期斜45度。

myPlot.XAxis1.TicksLabelAngle = 45;

//下面代码可让窗体移动begin; myPlot.AddInteraction(new NPlot.Windows.PlotSurface2D.Interactions.HorizontalDrag());

//myPlot.AddInteraction(new NPlot.Windows.PlotSurface2D.Interactions.VerticalDrag());

myPlot.AddInteraction(new NPlot.Windows.PlotSurface2D.Interactions.AxisDrag(true));

myPlot.Refresh(); 3、Nplot用法

///首先要将下载的NPlot.dll加到工具箱里，拖一个控件到窗体上，声明using NPlot;

////////对所绘的图进行打印与保存//////////

private void print() {

myPlot.Print(true); }

private void save() {

saveFileDialog1.Filter = \位图

(*.bmp)|*.bmp|JPEG(*.jpg)|*.jpg;*.jpeg;*,jpe|Gif(*.gif)|*.gif|Tiff(*.tiff)|*.tiff|Png(*.png)|*.png|Exif(*.exif)|*.exif|所有文件(*.*)|*.*\

if (saveFileDialog1.ShowDialog() == DialogResult.OK) { try {

int h = myPlot.Size.Height; int w = myPlot.Size.Width; Bitmap bm = new Bitmap(w, h); Bitmap bm1 = new Bitmap(w, h); Rectangle rt = new Rectangle(1, 1, w, h); saveFileDialog1.RestoreDirectory = true; saveFileDialog1.CreatePrompt = true; myPlot.DrawToBitmap(bm, rt);

if (saveFileDialog1.FilterIndex == 1) {

bm.Save(saveFileDialog1.FileName);