一个使用C#绘制图形引擎的Framework
下面将推荐一个可以很方便的生成多种图形格式的，使用了ASP+技术的图形 引擎代码。它的主要描述如下： 1.可以生成的图形文件格式支持BMP EMF，GIF，Icon，JPEG，PNG，TIFF，WMF 2.在文件ChartEngine.cs中为这个图形引擎的大量关键代码 StockPicker.aspx文件是一个使用该引擎绘图的例子 3.要使用这个图形引擎，需要把所有的代码文件复制到你的web的某个 运用目录（注：不是普通目录）中，然后在该目录下建立一个bin目录， 然后运行mk.bat 4.ImageGenerator_VB.asp文件的头使用了<%@ Page ContentType="image/jpeg" %>来说明生成的是某种格式的图形文件 5.为了服务器性能考虑，还可以在ImageGenerator_VB.asp中增加以下代码 <%@ OutputCache Duration="60" %>，该代码可以将生成的图形文件缓存起来 这样如果网站访问量大时，可以大大减轻服务器的负担 好了，废话少说，大家可以自己研究研究代码： 1.ChartEngine.cs文件 using System.WinForms; using System.Collections; using System.Collections.Bases; using System.Drawing; using System.Drawing.Drawing2D; using System.Drawing.Imaging; using System.ComponentModel; using System; using System.IO; namespace ChartGenerator { //Core Line Data structure public struct LineData { public float[] LineValues ; public string LineTitle ; public string LineSymbol ; } //Line Data plus display style information public class ChartLine { private Color lineColor ; private LineData lineData ; private DashStyle lineStyle ; private int lineWidth ; //Constructors public ChartLine() :base() {} public ChartLine(LineData lineData) :base() { this.lineData = lineData; } //Properties public Color Color { get { return lineColor ; } set { lineColor = value ; } } public DashStyle LineStyle { get { return lineStyle ; } set { lineStyle = value ; } } public string Symbol { get { return lineData.LineSymbol ; } set { lineData.LineSymbol = value ; } } public string Title { get { return lineData.LineTitle ; } set { lineData.LineTitle = value ; } } public float[] Values { get { return lineData.LineValues ; } set { lineData.LineValues = value ; } } public int Width { get { return lineWidth ; } set { lineWidth = value ; } } //Methods public void SetLineData(LineData lineData) { this.lineData = lineData; } } //Chart Data structure public class ChartData { private float yTickSize; private float yMax; private float yMin; private string[] xAxisTitles ; private ChartLineList lines = new ChartLineList(); private Color gridColor=Color.Blue; private bool showHGridLines=true; private bool showVGridLines=true; //Properties public float YTickSize { get { return yTickSize ; } set { yTickSize = value ; } } public float YMax { get { return yMax ; } set { yMax = value ; } } public float YMin { get { return yMin ; } set { yMin = value ; } } public string[] XAxisTitles { get { return xAxisTitles ; } set { xAxisTitles = value ; } } public ChartLineList Lines { get { return lines ; } set { lines = value ; } } public Color GridColor { get { return gridColor ; } set { gridColor = value ; } } public bool ShowHGridLines { get { return showHGridLines ; } set { showHGridLines = value ; } } public bool ShowVGridLines { get { return showVGridLines ; } set { showVGridLines = value ; } } //Collection of Chart Lines public class ChartLineList : TypedCollectionBase { public ChartLine this[int index] { get { return (ChartLine)(List[index]); } set { List[index] = value; } } public int Add(ChartLine value) { return List.Add(value); } public void Insert(int index, ChartLine value) { List.Insert(index, value); } public int IndexOf(ChartLine value) { return List.IndexOf(value); } public bool Contains(ChartLine value) { return List.Contains(value); } public void Remove(ChartLine value) { List.Remove(value); } public void CopyTo(ChartLine[] array, int index) { List.CopyTo(array, index); } } } //Charting Engine - draws a chart based on the given ChartData public class ChartEngine { private ChartData chartData ; private float left; private float right; private float top; private float bottom; private float tickCount; private float yCount; private float hspacing; private float vspacing; private Graphics g; private Rectangle r; private Color backColor; private Color foreColor; private Font baseFont; private Font legendFont; private RectangleF legendRect; public ChartEngine() { } public Bitmap DrawChart(int width, int height, ChartData chartData) { Bitmap newBitmap = new Bitmap(width,height,PixelFormat.Format32bppARGB); Graphics g = Graphics.FromImage(newBitmap); Rectangle r = new Rectangle(0, 0, width, height); Color myForeColor = Color.Black; Color myBackColor = Color.White; Font myFont = new Font("Arial", 10); this.DrawChart(g, r, myBackColor, myForeColor, myFont, chartData); return newBitmap; } public void DrawChart(Graphics g, Rectangle r, Color backColor, Color foreColor, Font baseFont, ChartData chartData) { this.chartData = chartData; this.g = g; this.r = r; this.backColor = backColor; this.foreColor = foreColor; this.baseFont = baseFont; this.legendFont = new Font(baseFont.FontFamily, (baseFont.Size * 2/3), baseFont.Style | FontStyle.Bold); g.SmoothingMode = SmoothingMode.AntiAlias; CalculateChartDimensions(); DrawBackground(); InternalDrawChart() ; } private void CalculateChartDimensions() { right = r.Width - 5; top = 5 * baseFont.Size ; bottom = r.Height - baseFont.Size * 2; tickCount = chartData.YMin ; yCount = (chartData.YMax-chartData.YMin) / chartData.YTickSize ; hspacing = (bottom-top) / yCount; vspacing = (right) / chartData.XAxisTitles.Length; //Left depends on width of text - for simplicities sake assume that largest yvalue is the biggest //Take into account the first X Axis title float maxYTextSize = g.MeasureString(chartData.YMax.ToString(), baseFont).Width; float firstXTitle = g.MeasureString(chartData.XAxisTitles[0], baseFont).Width; left = (maxYTextSize > firstXTitle) ? maxYTextSize : firstXTitle ; left = r.X + left + 5 ; //Calculate size of legend box float maxLegendWidth = 0 ; float maxLegendHeight = 0 ; //Work out size of biggest legend foreach (ChartLine cl in chartData.Lines) { float currentWidth = g.MeasureString(cl.Title, legendFont).Width; float currentHeight = g.MeasureString(cl.Title, legendFont).Height; maxLegendWidth = (maxLegendWidth > currentWidth) ? maxLegendWidth : currentWidth ; maxLegendHeight = (maxLegendHeight > currentHeight) ? maxLegendHeight : currentHeight ; } legendRect = new RectangleF(r.X+2, r.Y+2, maxLegendWidth + 25 + 5, ((maxLegendHeight+2)*chartData.Lines.Count) + 3) ; } private void DrawBackground() { LinearGradientBrush b = new LinearGradientBrush(r, Color.SteelBlue, backColor,LinearGradientMode.Horizontal); g.FillRectangle(b, r); b.Dispose(); } private void InternalDrawChart() { DrawGrid() ; foreach (ChartLine cl in chartData.Lines) { DrawLine(cl); } DrawLegend() ; //Draw time on chart string timeString = DateTime.ToString(DateTime.Now) ; SizeF textsize = g.MeasureString(timeString,baseFont); g.DrawString(timeString, baseFont, new SolidBrush(foreColor), r.Width - textsize.Width - 5, textsize.Height * 2 / 3) ; } private void DrawGrid() { Pen gridPen = new Pen(chartData.GridColor) ; //Vertical - include tick desc's if (chartData.ShowVGridLines) { for (int i = 0 ; (vspacing * i) < right; i++) { float x = left + (vspacing *i); string desc = chartData.XAxisTitles[i]; g.DrawLine(gridPen, x,top,x,bottom +(baseFont.Size*1/3)); SizeF textsize = g.MeasureString(desc,baseFont); g.DrawString(desc, baseFont, new SolidBrush(chartData.GridColor), x-(textsize.Width/2), bottom + (baseFont.Size*2/3)) ; } } //Horizontal if (chartData.ShowHGridLines) { for (float i = bottom ; i > top; i-=hspacing) { string desc = tickCount.ToString(); tickCount+=chartData.YTickSize; g.DrawLine(gridPen, right, i, left-3, i); SizeF textsize = g.MeasureString(desc,baseFont); g.DrawString(desc, baseFont, new SolidBrush(chartData.GridColor), left-textsize.Width - 3, i - (textsize.Height/2)) ; } } } private void DrawLine(ChartLine chartLine) { Pen linePen = new Pen(chartLine.Color); linePen.StartCap = LineCap.Round; linePen.EndCap = LineCap.Round; linePen.Width = chartLine.Width ; linePen.DashStyle = chartLine.LineStyle; PointF[] Values = new PointF[chartLine.Values.Length]; float scale = hspacing / chartData.YTickSize ; for (int i = 0 ; i < chartLine.Values.Length; i++) { float x = left + vspacing * i; Values[i] = new PointF(x, bottom-chartLine.Values[i]*scale); } g.DrawLines(linePen, Values); } private void DrawLegend() { //Draw Legend Box ControlPaint.DrawBorder(g, (Rectangle)legendRect, SystemColors.WindowFrame, ButtonBorderStyle.Solid); LinearGradientBrush b = new LinearGradientBrush(legendRect, backColor, Color.SteelBlue, LinearGradientMode.Horizontal); r.Inflate(-1, -1); g.FillRectangle(b, legendRect); b.Dispose(); float startY = 5; foreach (ChartLine cl in chartData.Lines) { Pen p = new Pen(cl.Color) ; p.Width = p.Width*4; SizeF textsize = g.MeasureString(cl.Title, legendFont); float lineY = startY + textsize.Height / 2 ; g.DrawLine(p, r.X + 7, lineY, r.X + 25, lineY); g.DrawString(cl.Title, legendFont, new SolidBrush(foreColor), r.X + 30, startY); startY += (textsize.Height+2); } } } } 2.ImageGenerator_Vb.aspx文件 <%@ Page Language="VB" ContentType="image/jpeg" %> <%@ Import Namespace="System.Drawing" %> <%@ Import Namespace="System.Drawing.Drawing2D" %> <%@ Import Namespace="System.Drawing.Imaging" %> <%@ Import Namespace="ChartGenerator" %> <script language="VB" runat=server> Function GetStockDetails(Symbol as String) as ChartLine Dim myChartLine as new ChartLine if (symbol = "msft") then Dim StockValues() as Single = { 60, 110, 120, 180, 185, 190, 240, 290 } myChartLine.Width = 5 myChartLine.Color = Color.White myChartLine.LineStyle = DashStyle.Solid myChartLine.Title = "Microsoft Corp. (MSFT)" myChartLine.Symbol = "MSFT" myChartLine.Values = StockValues return myChartLine elseif (symbol = "sun") then Dim StockValues() as Single = { 180, 155, 125, 60, 25, 15, 10, 3 } myChartLine.Width = 5 myChartLine.Color = Color.Red myChartLine.LineStyle = DashStyle.Dot myChartLine.Title = "Sun Corp. (Sun)" myChartLine.Symbol = "Sun" myChartLine.Values = StockValues return myChartLine end if return nothing End Function Sub Page_Load(Sender as Object, E as EventArgs) ' Generate Chart Data For Image.... Dim XAxes() as String = { "9:00AM", "9:30AM", "10:00AM", "11:00AM", "12:00AM", "1:00PM", "1:30PM" } Dim MyChartData as New ChartData MyChartData.YTickSize = 20 MyChartData.YMax = 250 MyChartData.YMin = 0 MyChartData.XAxisTitles = XAxes Dim Symbols() as String = Request.QueryString.GetValues("symbols") if (Not Symbols Is Nothing) then for i=0 to Symbols.Length-1 Dim stockValue as ChartLine = GetStockDetails(symbols(i).ToLower) if (stockValue <> noting) then myChartData.Lines.Add(stockValue) end if Next end if ' Create In-Memory BitMap of JPEG Dim MyChartEngine as New ChartEngine Dim StockBitMap as BitMap = MyChartEngine.DrawChart(600, 400, myChartData) ' Render BitMap Stream Back To Client StockBitMap.Save(Response.OutputStream, ImageFormat.JPEG) End Sub </script> 3.StockPicker.aspx文件 <script language="C#" runat=server> void ChartBtn_Click(Object sender, EventArgs e) { chart.ImageUrl = "ImageGenerator_Vb.aspx?"; chart.Visible = true; foreach(ListItem item in Stocks.Items) { if (item.Selected == true) { chart.ImageUrl += "symbols=" + item.Value + "&"; } } } </script> <html> <body> <form runat=server> <h1>Scott's Stock Picker</h1> <asp:checkboxlist Visible=false runat=server/> </form> </body> </html> 4.mk.bat文件 csc /t:library /debug+ /out:bin\chartgen.dll ChartEngine.cs /r:System.Web.dll /r:System.Winforms.dll /r:System.Drawing.dll /r:System.dll |
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