如何在C#的WinForm中制作饼状图和柱状图（二）

//»­ÌõÐÎͼ
public class BarChart
{
public BarChart()
{
}
//RenderÊÇͼÐδó±êÌ⣬ͼ¿ªÐ¡±êÌ⣬ͼÐοí¶È£¬Í¼Ðγ¤¶È£¬±ýͼµÄÊý¾Ý¼¯ºÍ±ýͼµÄÊý¾Ý¼¯
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];

//¼ÆËã×î¸ßµÄµã
float highPoint = 0;
foreach(DataRow dr in dt.Rows)
{
if(highPoint<Convert.ToSingle(dr[0]))
{
highPoint = Convert.ToSingle(dr[0]);
}
}
//½¨Á¢Ò»¸öGraphics¶ÔÏóʵÀý
Bitmap bm = new Bitmap(width,height);
try
{
Graphics g = Graphics.FromImage(bm);
//ÉèÖÃÌõͼͼÐκÍÎÄ×ÖÊôÐÔ
g.ScaleTransform((Convert.ToSingle(width))/SIDE_LENGTH,(Convert.ToSingle(height))/SIDE_LENGTH);
g.SmoothingMode = SmoothingMode.Default;
g.TextRenderingHint = TextRenderingHint.AntiAlias;

//É趨»­²¼ºÍ±ß
g.Clear(Color.White);
g.DrawRectangle(Pens.Black,0,0,SIDE_LENGTH-1,SIDE_LENGTH-1);
//»­´ó±êÌâ
g.DrawString(title,new Font(Tahoma,14),Brushes.Black,new PointF(5,5));
//»­Ð¡±êÌâ
g.DrawString(subTitle,new Font(Tahoma,12),Brushes.Black,new PointF(7,35));
//»­ÌõÐÎͼ
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[i][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);
}
//ÉèÖñß
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));
//»­Í¼Àý¿òºÍÎÄ×Ö
g.DrawRectangle(new Pen(Color.Black,1),200,300,199,99);
g.DrawString(ͼ±í˵Ã÷,new Font(Tahoma,12,FontStyle.Bold),Brushes.Black,new PointF(200,300));

//»­Í¼Àý
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[i][1].ToString() + - + dt.Rows[i][0].ToString(),new Font(Tahoma,10),Brushes.Black,textOrigin);
boxOrigin.Y += 15;
textOrigin.Y += 15;
}
//Êä³öͼÐÎ
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;
}
}
}

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