C#绘制曲线图和柱状图.doc

在我们程序开发的过程中经常会需要绘制曲线图和柱状图等，尤其是在做统计功能时。但是有时候我们有觉得没有必要使用第三方控件（例如：ZedGraph等），这是我们可以自己编写代码来实现这些图形绘制的功能。以下是我在开发过程中所使用过的两段代码，现共享大家，希望能给大家带来一定的帮助，如有不妥敬请斧正！1.柱状图，效果图如下代码如下：注意：请注意参数 chartTable 图形里的一些元素需要从chartTable里面取。具体请查看代码。/Render是图形大标题，图开小标题，图形宽度，图形长度，饼图的数据集和饼图的数据集publicImageRender(stringtitle,intwidth,intheight,DataTablechartTable)Bitmapbm=newBitmap(width,height);Graphicsg=Graphics.FromImage(bm);g.Clear(Color.White);DataTabledt=chartTable;constinttop=30;constintleft=35;if(widthleft*2|heighttop*2)g.DrawString(绘图区域太小,newFont(Tahoma,8),Brushes.Blue,newPointF(0,0);returnbm;/计算最高的点floathighPoint=1;foreach(DataRowdrindt.Rows)if(highPointConvert.ToSingle(dr0)highPoint=Convert.ToSingle(dr0);if(highPoint2*top/3)topFontSize=2*top/3;if(topFontSize5)topFontSize=5;for(inti=0;i2*top/3)bottomFontSize=2*top/3;barHeight=Convert.ToSingle(dt.Rowsi0)*(height-2*top)/highPoint*1;barOrigin.Y=height-barHeight-top;g.FillRectangle(newSolidBrush(Color.Red),barOrigin.X,barOrigin.Y,barWidth,barHeight);/柱状图底部g.DrawString(dt.Rowsi2.ToString(),newFont(Tahoma,bottomFontSize),Brushes.Black,newPointF(barOrigin.X,height-top);/柱状图顶部g.DrawString(dt.Rowsi0.ToString(),newFont(Tahoma,topFontSize),Brushes.Red,newPointF(barOrigin.X,barOrigin.Y-3*topFontSize/2);barOrigin.X=barOrigin.X+barWidth;barHeight=Convert.ToSingle(dt.Rowsi1)*(height-2*top)/highPoint*1;barOrigin.Y=height-barHeight-top;g.FillRectangle(newSolidBrush(Color.Blue),barOrigin.X,barOrigin.Y,barWidth,barHeight);/柱状图顶部g.DrawString(dt.Rowsi1.ToString(),newFont(Tahoma,topFontSize),Brushes.Blue,newPointF(barOrigin.X,barOrigin.Y-3*topFontSize/2);barOrigin.X=barOrigin.X+(barWidth*2);/设置边g.DrawLine(newPen(Color.Blue,2),newPoint(left,top),newPoint(left,height-top);g.DrawLine(newPen(Color.Blue,2),newPoint(left,height-top),newPoint(left+width,height-top);g.Dispose();returnbm;catchreturnbm;2.线状图，效果如下：代码如下： 注意：请注意参数 chartTable 图形里的一些元素需要从chartTable里面取。具体请查看代码。/Render是图形大标题，图开小标题，图形宽度，图形长度，饼图的数据集和饼图的数据集publicImageRender(stringtitle,intwidth,intheight,DataTablechartTable)Bitmapbm=newBitmap(width,height);Graphicsg=Graphics.FromImage(bm);g.Clear(Color.White);constinttop=30;constintleft=35;if(widthleft*2|heighttop*2)g.DrawString(绘图区域太小,newFont(Tahoma,8),Brushes.Blue,newPointF(0,0);returnbm;if(chartTable=null)g.DrawString(没有数据,newFont(Tahoma,7),Brushes.Blue,newPointF(0,0);returnbm;DataTabledt=chartTable;/计算最高的点floathighPoint=1;foreach(DataRowdrindt.Rows)if(highPointConvert.ToSingle(dr0)highPoint=Convert.ToSingle(dr0);if(highPointConvert.ToSingle(dr1)highPoint=Convert.ToSingle(dr1);/建立一个Graphics对象实例try/画大标题g.DrawString(title,newFont(Tahoma,12),Brushes.Black,newPointF(2,2);StringFormatdrawFormat=newStringFormat();drawFormat.FormatFlags=StringFormatFlags.DirectionVertical;g.DrawString(红-+dt.Columns0.ToString()+,newFont(Tahoma,8),Brushes.Red,newPointF(2,top),drawFormat);g.DrawString(蓝-+dt.Columns1.ToString()+,newFont(Tahoma,8),Brushes.Blue,newPointF(17,top),drawFormat);/画条形图floatbarWidth=(Convert.ToSingle(width)-left)/(dt.Rows.Count+1);PointFbarOrigin=newPointF(left+barWidth,0);floatbarHeight=dt.Rows.Count;floattopFontSize=7;floatbottomFontSize=7;PointFpt1=newPointFdt.Rows.Count;PointFpt2=newPointFdt.Rows.Count;for(inti=0;i10)intdis=dt.Rows.Count/10;for(inti=0;idt.Rows.Count;i+)if(i%dis=0)g.DrawLine(newPen(Color.Blue,2),newPointF(left+(i+1)*barWidth,height-top+5),newPointF(left+(i+1)*barWidth,height-top-3);/底部g.DrawString(dt.Rowsi2.ToString(),newFont(Tahoma,bottomFontSize),Brushes.Black,newPointF(left+(i+1)*barWidth,height-top);elseg.DrawLine(newPen(Color.Gray,1),newPointF(left+(i+1)*barWidth,height-top+3),newPointF(left+(i+1)*barWidth,height-top-3);elsefor(inti=0;idt.Rows.Count;i+)g.DrawLine(newPen(Color.Gray,1),newPointF(left+(i+1)*barWidth,height-top+3),newPointF(left+(i+1)*barWidth,height-top-3);/绘制曲线g.DrawLines(newPen(newSolidBrush(Color.Red),1),pt1);g.DrawLines(newPen(newSolidBrush(Color.Blue),1),pt2);/设置