C# GraphPane.Draw方法代码示例

		/// <summary>
		/// Method to create a <see cref="ZedGraph.GraphPane"/> class for the control.
		/// </summary>
		/// <param name="OutputStream">A <see cref="Stream"/> in which to output the ZedGraph
		/// <see cref="System.Drawing.Image"/>.</param>
		protected void CreateGraph( System.IO.Stream OutputStream )
		{
			//TODO: fix/verify the height/width values are okay like this
			RectangleF rect = new RectangleF( 0, 0, this.Width-1, this.Height-1 );
			GraphPane pane = new GraphPane( rect, title, xlabel, ylabel );
						
			//TODO: add all the goodies from visual mode
			pane.IsShowTitle = this.IsShowTitle;

			Bitmap image = new Bitmap( this.Width, this.Height ); 			
			Graphics g = Graphics.FromImage( image );
			// Use callback to gather more settings
			OnDrawPane( g, pane );			
			
			// Render the graph to a bitmap
			g.Clear(Color.FromArgb(255, 255, 255, 255)); 
			pane.Draw( g ); 
        
			// Stream the graph out				
			MemoryStream ms = new MemoryStream(); 
			image.Save( ms, this.ImageFormat );				

			//TODO: provide caching options
			ms.WriteTo(OutputStream);
		}

        private static void AxisChangeAndDraw(GraphPane myPane)
        {
            using (Bitmap b = new Bitmap(640, 480))
            {
                using (Graphics g = Graphics.FromImage(b))
                {
                    myPane.AxisChange(g);

                    myPane.Draw(g);
                }
            }
        }

        private void CopyToClip( GraphPane thePane )
        {
            Graphics g = this.CreateGraphics();
            IntPtr hdc = g.GetHdc();
            //metaFile = new Metafile( hdc, EmfType.EmfPlusDual, "ZedGraph" );
            Metafile metaFile = new Metafile(hdc, EmfType.EmfPlusOnly);
            g.ReleaseHdc(hdc);
            g.Dispose();

            Graphics gMeta = Graphics.FromImage( metaFile );
            thePane.Draw( gMeta );
            gMeta.Dispose();

            //You can call this function with code that is similar to the following code:
            //ClipboardMetafileHelper.PutEnhMetafileOnClipboard( this.Handle, metaFile );

            IntPtr hMeta = metaFile.GetHenhmetafile();
            System.Windows.Forms.Clipboard.SetDataObject( hMeta, true  );

            MessageBox.Show( "Copied to ClipBoard" );
        }

//.........这里部分代码省略.........
            myPane.AxisChange( this.CreateGraphics() );

            #endif

            #if false	// Basic curve test - Linear Axis with Many Points

            myPane = new GraphPane( new RectangleF( 0, 0, 640, 480 ), "Title", "XAxis", "YAxis" );

            PointPairList list = new PointPairList();

            for ( int i=0; i<100000; i++ )
            {
                double x = (double) i;
                double y = Math.Sin( x / 8.0 );
                double z = Math.Abs(Math.Cos( i / 8.0 )) * y;

                list.Add( x, y, z );
            }

            LineItem myCurve = myPane.AddCurve( "curve", list, Color.Blue, SymbolType.HDash );
            myCurve.Symbol.IsVisible = false;
            //myPane.XAxis.Min = 1;
            //myPane.XAxis.Max = 100;
            //myPane.XAxis.IsReverse = true;
            //myPane.XAxis.Type = AxisType.Log;

            //RectangleF rect = new RectangleF( 3, 0.7, 8, 0.2 );
            Graphics g = this.CreateGraphics();
            myPane.AxisChange( g );
            SetSize();

            int startTick = Environment.TickCount;

            myPane.Draw( g );

            int endTick = Environment.TickCount;

            MessageBox.Show( "ticks = " + ( endTick - startTick ).ToString() );
            #endif

            #if false	// Gantt Chart
            myPane = new GraphPane();

            myPane.Title.Text = "Gantt Chart";
            myPane.XAxis.Title.Text = "Date";
            myPane.YAxis.Title.Text = "Project";

            myPane.XAxis.Type = AxisType.Date;
            myPane.YAxis.Type = AxisType.Text;
            myPane.BarBase = BarBase.Y;

            string[] labels = { "Project 1", "Project 2" };
            myPane.YAxis.TextLabels = labels;
            myPane.YAxis.IsTicsBetweenLabels = true;

            // First, define all the bars that you want to be red
            PointPairList ppl = new PointPairList();
            XDate start = new XDate( 2005, 10, 31 );
            XDate end = new XDate( 2005, 11, 15 );
            // x is start of bar, y is project number, z is end of bar
            // Define this first one using start/end variables for illustration
            ppl.Add( start, 1.0, end );
            // add another red bar, assigned to project 2
            // Didn't use start/end variables here, but it's the same concept
            ppl.Add( new XDate( 2005, 12, 16 ), 2.0, new XDate( 2005, 12, 31 ) );
            HiLowBarItem myBar = myPane.AddHiLowBar( "job 1", ppl, Color.Red );

 protected override Image DoCreateChartImage()
 {
     var pg = new GraphPane();
     var seria = new PointPairList();
     foreach (var pointPair in Parameters.SeriaData.Select(p => new PointPair(p.Key, p.Value)))
     {
         seria.Add(pointPair);
     }
     pg.AddCurve("Test", seria, Color.DeepSkyBlue);
     pg.AxisChange();
     Image tmpImage = new Bitmap(Parameters.ChartWidth, Parameters.ChartHeight);
     var g = Graphics.FromImage(tmpImage);
     pg.ReSize(g, new RectangleF(0, 0, Parameters.ChartWidth, Parameters.ChartHeight));
     pg.Draw(g);
     return tmpImage;
 }