知识大全如何在C#的WinForm中制作饼状图和柱状图

Posted 2022-07-17 图形

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　　当我们的软件需要各种饼状图和柱状图来表示数据时我们或许会想到用Offices中的图形控件或是第三方控件但现在的第三方控件大都需要注册有些免费的控件会有开发商的标记等而对于使用Offices的图形控件来说并不能在程序中得于很好控制其使用的简易程度也较低所以在这我给出在C#中使用GDI+实现饼状图和柱状图跟数据库联接显示数据的方法

　　using System;using System IO;//用于文件存取using System Data;//用于数据访问using System Drawing;//提供画GDI+图形的基本功能using System Drawing Text;//提供画GDI+图形的高级功能using System Drawing Drawing D;//提供画高级二维矢量图形功能using System Drawing Imaging;//提供画GDI+图形的高级功能namespace BaseLayerpublic class PieChartpublic PieChart()//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要表示出来的数据public Image Render(string title string subTitle int width int height DataSet chartData int DataLine)const int SIDE_LENGTH = ;const int PIE_DIAMETER = ;DataTable dt = chartData Tables[ ];

　　//通过输入参数取得饼图中的总基数float sumData = ;foreach(DataRow dr in dt Rows)sumData += Convert ToSingle(dr[DataLine]);//产生一个image对象并由此产生一个Graphics对象Bitmap bm = new Bitmap(width height);Graphics g = Graphics FromImage(bm);//设置对象g的属性g ScaleTransform((Convert ToSingle(width))/SIDE_LENGTH (Convert ToSingle(height))/SIDE_LENGTH);g SmoothingMode = SmoothingMode Default;g TextRenderingHint = TextRenderingHint AntiAlias;

　　//画布和边的设定g Clear(Color White);g DrawRectangle(Pens Black SIDE_LENGTH SIDE_LENGTH );//画饼图标题g DrawString(title new Font( Tahoma ) Brushes Black new PointF( ));//画饼图的图例g DrawString(subTitle new Font( Tahoma ) Brushes Black new PointF( ));//画饼图float curAngle = ;float totalAngle = ;for(int i= ;i<dt Rows Count;i++)curAngle = Convert ToSingle(dt Rows[i][DataLine]) / sumData * ;

　　g FillPie(new SolidBrush(ChartUtil GetChartItemColor(i)) PIE_DIAMETER PIE_DIAMETER totalAngle curAngle);g DrawPie(Pens Black PIE_DIAMETER PIE_DIAMETER totalAngle curAngle);totalAngle += curAngle;//画图例框及其文字g DrawRectangle(Pens Black );g DrawString( 图表说明 new Font( Tahoma FontStyle Bold) Brushes Black new PointF( ));

　　//画图例各项PointF boxOrigin = new PointF( );PointF textOrigin = new PointF( );float percent = ;for(int i= ;i<dt Rows Count;i++)g FillRectangle(new SolidBrush(ChartUtil GetChartItemColor(i)) boxOrigin X boxOrigin Y );g DrawRectangle(Pens Black boxOrigin X boxOrigin Y );percent = Convert ToSingle(dt Rows[i][DataLine]) / sumData * ;g DrawString(dt Rows[i][ ] ToString() + + dt Rows[i][ ] ToString() + ( + percent ToString( ) + %) new Font( Tahoma ) Brushes Black textOrigin);boxOrigin Y += ;textOrigin Y += ;//回收资源g Dispose();return (Image) bm;

　　//画条形图public class BarChartpublic BarChart()//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public Image Render(string title string subTitle int width int height DataSet chartData)const int SIDE_LENGTH = ;const int CHART_TOP = ;const int CHART_HEIGHT = ;const int CHART_LEFT = ;const int CHART_WIDTH = ;DataTable dt = chartData Tables[ ];

　　//计算最高的点float highPoint = ;foreach(DataRow dr in dt Rows)if(highPoint<Convert ToSingle(dr[ ]))highPoint = Convert ToSingle(dr[ ]);//建立一个Graphics对象实例Bitmap bm = new Bitmap(width height);tryGraphics g = Graphics FromImage(bm);//设置条图图形和文字属性g ScaleTransform((Convert ToSingle(width))/SIDE_LENGTH (Convert ToSingle(height))/SIDE_LENGTH);g SmoothingMode = SmoothingMode Default;g TextRenderingHint = TextRenderingHint AntiAlias;

　　//设定画布和边g Clear(Color White);g DrawRectangle(Pens Black SIDE_LENGTH SIDE_LENGTH );//画大标题g DrawString(title new Font( Tahoma ) Brushes Black new PointF( ));//画小标题g DrawString(subTitle new Font( Tahoma ) Brushes Black new PointF( ));//画条形图float barWidth = CHART_WIDTH / (dt Rows Count * );PointF barOrigin = new PointF(CHART_LEFT + (barWidth / ) );float barHeight = dt Rows Count;for(int i= ;i<dt Rows Count;i++)barHeight = Convert ToSingle(dt Rows[i][ ]) * / highPoint * ;barOrigin Y = CHART_TOP + CHART_HEIGHT barHeight;g FillRectangle(new SolidBrush(ChartUtil GetChartItemColor(i)) barOrigin X barOrigin Y barWidth barHeight);barOrigin X = barOrigin X + (barWidth * );//设置边g DrawLine(new Pen(Color Black ) new Point(CHART_LEFT CHART_TOP) new Point(CHART_LEFT CHART_TOP + CHART_HEIGHT));g DrawLine(new Pen(Color Black ) new Point(CHART_LEFT CHART_TOP + CHART_HEIGHT) new Point(CHART_LEFT + CHART_WIDTH CHART_TOP + CHART_HEIGHT));//画图例框和文字g DrawRectangle(new Pen(Color Black ) );g DrawString( 图表说明 new Font( Tahoma FontStyle Bold) Brushes Black new PointF( ));

　　//画图例PointF boxOrigin = new PointF( );PointF textOrigin = new PointF( );for(int i= ;i<dt Rows Count;i++)g FillRectangle(new SolidBrush(ChartUtil GetChartItemColor(i)) boxOrigin X boxOrigin Y );g DrawRectangle(Pens Black boxOrigin X boxOrigin Y );g DrawString(dt Rows[i][ ] ToString() + + dt Rows[i][ ] ToString() new Font( Tahoma ) Brushes Black textOrigin);boxOrigin Y += ;textOrigin Y += ;//输出图形g Dispose();return bm;catchreturn bm;public class ChartUtilpublic ChartUtil()public static Color GetChartItemColor(int itemIndex)Color selectedColor;switch(itemIndex)case :selectedColor = Color Blue;break;case :selectedColor = Color Red;break;case :selectedColor = Color Yellow;break;case :selectedColor = Color Purple;break;default:selectedColor = Color Green;break;return selectedColor;

cha138/Article/program/net/201311/11951

知识大全 如何在C#的WinForm中制作饼状图和柱状图

知识大全如何在C#的WinForm中制作饼状图和柱状图