using System;
using System.IO;//用于文件存取
using System.Data;//用于數據訪問
using System.Drawing;//提供畫GDI+圖形的基本功能
using System.Drawing.Text;//提供畫GDI+圖形的高級功能
using System.Drawing.Drawing2D;//提供畫高級二維，矢量圖形功能
using System.Drawing.Imaging;//提供畫GDI+圖形的高級功能
namespace BaseLayer
{
?public class PieChart
?{
??public PieChart()
??{
??}

//Render是圖形大標題，圖開小標題，圖形寬度，圖形長度，餅圖的數據集和餅圖的數據集要表示出來的數據

??public Image Render(string title, string subTitle, int width, int height, DataSet chartData,int DataLine)
??{
???const int SIDE_LENGTH = 400;
???const int PIE_DIAMETER = 200;
???DataTable dt = chartData.Tables[0];
??
???//通過輸入參數，取得餅圖中的總基數
???float sumData = 0;
???foreach(DataRow dr in dt.Rows)
???{
????sumData += Convert.ToSingle(dr[DataLine]);
???}
???//產生一個image對象，并由此產生一個Graphics對象
???Bitmap bm = new Bitmap(width,height);
???Graphics g = Graphics.FromImage(bm);
???//設置對象g的屬性
???g.ScaleTransform((Convert.ToSingle(width))/SIDE_LENGTH,(Convert.ToSingle(height))/SIDE_LENGTH);
???g.SmoothingMode = SmoothingMode.Default;
???g.TextRenderingHint = TextRenderingHint.AntiAlias;
??
???//畫布和邊的設定
???g.Clear(Color.White);
???g.DrawRectangle(Pens.Black,0,0,SIDE_LENGTH-1,SIDE_LENGTH-1);
???//畫餅圖標題
???g.DrawString(title,new Font("Tahoma",14),Brushes.Black,new PointF(5,5));
???//畫餅圖的圖例
???g.DrawString(subTitle,new Font("Tahoma",12),Brushes.Black,new PointF(7,35));
???//畫餅圖
???float curAngle = 0;
???float totalAngle = 0;
???for(int i=0;i<dt.Rows.Count;i++)
???{
????curAngle = Convert.ToSingle(dt.Rows[DataLine]) / sumData * 360;
??
????g.FillPie(new SolidBrush(ChartUtil.GetChartItemColor(i)),100,65,PIE_DIAMETER,PIE_DIAMETER,totalAngle,curAngle);
????g.DrawPie(Pens.Black,100,65,PIE_DIAMETER,PIE_DIAMETER,totalAngle,curAngle);
????totalAngle += curAngle;
???}
???//畫圖例框及其文字
???g.DrawRectangle(Pens.Black,200,300,199,99);
???g.DrawString("圖表說明",new Font("Tahoma",12,FontStyle.Bold),Brushes.Black,new PointF(200,300));
??
???//畫圖例各項
???PointF boxOrigin = new PointF(210,330);
???PointF textOrigin = new PointF(235,326);
???float percent = 0;
???for(int i=0;i<dt.Rows.Count;i++)
???{
????g.FillRectangle(new SolidBrush(ChartUtil.GetChartItemColor(i)),boxOrigin.X,boxOrigin.Y,20,10);
????g.DrawRectangle(Pens.Black,boxOrigin.X,boxOrigin.Y,20,10);
????percent = Convert.ToSingle(dt.Rows[DataLine]) / sumData * 100;
????g.DrawString(dt.Rows[1].ToString() + " - " + dt.Rows[0].ToString() + " (" + percent.ToString("0") + "%)",new Font("Tahoma",10),Brushes.Black,textOrigin);
????boxOrigin.Y += 15;
????textOrigin.Y += 15;
???}
???//回收資源
???g.Dispose();
???return (Image) bm;
??
??}
?}
??
?//畫條形圖
?public class BarChart
?{
??public BarChart()
??{
??}

//Render是圖形大標題，圖開小標題，圖形寬度，圖形長度，餅圖的數據集和餅圖的數據集
??public Image Render(string title, string subTitle, int width, int height, DataSet chartData)
??{
???const int SIDE_LENGTH = 400;
???const int CHART_TOP = 75;
???const int CHART_HEIGHT = 200;
???const int CHART_LEFT = 50;
???const int CHART_WIDTH = 300;
???DataTable dt = chartData.Tables[0];
??
???//計算最高的點
???float highPoint = 0;
???foreach(DataRow dr in dt.Rows)
???{
????if(highPoint<Convert.ToSingle(dr[0]))
????{
?????highPoint = Convert.ToSingle(dr[0]);
????}
???}
???//建立一個Graphics對象實例
???Bitmap bm = new Bitmap(width,height);
???try
???{
????Graphics g = Graphics.FromImage(bm);
????//設置條圖圖形和文字屬性
????g.ScaleTransform((Convert.ToSingle(width))/SIDE_LENGTH,(Convert.ToSingle(height))/SIDE_LENGTH);
????g.SmoothingMode = SmoothingMode.Default;
????g.TextRenderingHint = TextRenderingHint.AntiAlias;
??
????//設定畫布和邊
????g.Clear(Color.White);
????g.DrawRectangle(Pens.Black,0,0,SIDE_LENGTH-1,SIDE_LENGTH-1);
????//畫大標題
????g.DrawString(title,new Font("Tahoma",14),Brushes.Black,new PointF(5,5));
????//畫小標題
????g.DrawString(subTitle,new Font("Tahoma",12),Brushes.Black,new PointF(7,35));
????//畫條形圖
????float barWidth = CHART_WIDTH / (dt.Rows.Count * 2);
????PointF barOrigin = new PointF(CHART_LEFT + (barWidth / 2),0);
????float barHeight = dt.Rows.Count;
????for(int i=0;i<dt.Rows.Count;i++)
????{
?????barHeight = Convert.ToSingle(dt.Rows[0]) * 200 / highPoint * 1;
?????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 * 2);
????}
????//設置邊
????g.DrawLine(new Pen(Color.Black,2),new Point(CHART_LEFT,CHART_TOP),new Point(CHART_LEFT,CHART_TOP + CHART_HEIGHT));
????g.DrawLine(new Pen(Color.Black,2),new Point(CHART_LEFT,CHART_TOP + CHART_HEIGHT),new Point(CHART_LEFT + CHART_WIDTH,CHART_TOP + CHART_HEIGHT));
????//畫圖例框和文字
????g.DrawRectangle(new Pen(Color.Black,1),200,300,199,99);
????g.DrawString("圖表說明",new Font("Tahoma",12,FontStyle.Bold),Brushes.Black,new PointF(200,300));
??
????//畫圖例
????PointF boxOrigin = new PointF(210,330);
????PointF textOrigin = new PointF(235,326);
????for(int i=0;i<dt.Rows.Count;i++)
????{
?????g.FillRectangle(new SolidBrush(ChartUtil.GetChartItemColor(i)),boxOrigin.X,boxOrigin.Y,20,10);
?????g.DrawRectangle(Pens.Black,boxOrigin.X,boxOrigin.Y,20,10);
?????g.DrawString(dt.Rows[1].ToString() + " - " + dt.Rows[0].ToString(),new Font("Tahoma",10),Brushes.Black,textOrigin);
?????boxOrigin.Y += 15;
?????textOrigin.Y += 15;
????}
????//輸出圖形
????g.Dispose();
????return bm;
???}
???catch
???{
????return bm;
???}???
??}
?}
?public class ChartUtil
?{
??public ChartUtil()
??{
??}
??public static Color GetChartItemColor(int itemIndex)
??{
???Color selectedColor;
???switch(itemIndex)
???{
????case 0:
?????selectedColor = Color.Blue;
?????break;
????case 1:
?????selectedColor = Color.Red;
?????break;
????case 2:
?????selectedColor = Color.Yellow;
?????break;
????case 3:
?????selectedColor = Color.Purple;
?????break;
????default:
?????selectedColor = Color.Green;
?????break;
???}
???return selectedColor;
??}
?}
}