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asp.net中生成饼状与柱状图实例

点击量:70   时间:2020-06-18

using System.Collections.Generic;

using System.Text;

//

//using System.Data;

//using System.Web.UI.WebControls;

//

using System.Drawing;

using System.Drawing.Imaging;

namespace Tools

{

public static class OWCImageHelp

{

///

/// 动态的生成柱状图和饼状图

///

///

行坐标要显示的字段

///

纵坐标要显示的数字

///

标题

public static void GetZBImage(string[] arrValueNames, int[] arrValues, string title)

{

Bitmap objBitMap = new Bitmap(650, 300);

Graphics objGraphics;

objGraphics = Graphics.FromImage(objBitMap);

objGraphics.Clear(Color.White);

//int[] arrValues = { 40000, 32000, 24000, 30000, 36000, 28000 };

//string[] arrValueNames = new string[] { "第一次", "第二次", "第三次", "第四次", "第五次", "第六次" };

objGraphics.DrawString(title, new System.Drawing.Font("宋体", 16), Brushes.Blue, new PointF(5, 5));

PointF symbolLeg = new PointF(335, 20);

PointF descLeg = new PointF(360, 16);

//画出说明部分的图形

for (int i = 0; i < arrValueNames.Length; i++)

{

objGraphics.FillRectangle(new SolidBrush(GetColor(i)), symbolLeg.X, symbolLeg.Y, 20, 10);

objGraphics.DrawRectangle(Pens.Black, symbolLeg.X, symbolLeg.Y, 20, 10);

objGraphics.DrawString(arrValueNames[i].ToString(), new System.Drawing.Font("宋体", 10), Brushes.Black, descLeg);

symbolLeg.Y += 15;

descLeg.Y += 15;

}

float TotalValues = 0;

for (int i = 0; i <= arrValues.Length - 1; i++)

{

TotalValues += arrValues[i];

}

//绘出矩形图。

float Rectangleheight = 0;

PointF recLeg = new PointF(12, 200 - arrValues[0] / TotalValues * 300);

for (int i = 0; i < arrValues.Length; i++)

{

Rectangleheight = arrValues[i] / TotalValues * 300;

objGraphics.FillRectangle(new SolidBrush(GetColor(i)), (i * 35) + 15, 200 - Rectangleheight, 20, Rectangleheight + 50);

objGraphics.DrawRectangle(Pens.Black, (i * 35) + 15, 200 - Rectangleheight, 20, Rectangleheight + 50);

recLeg.Y = 200 - Rectangleheight - 14;

objGraphics.DrawString(arrValues[i].ToString(), new System.Drawing.Font("宋体", 10), Brushes.Blue, recLeg);

recLeg.X += 35;

}

//绘出圆形图。

float sglCurrentAngle = 0;

float sglTotalAngle = 0;

for (int i = 0; i < arrValues.Length; i++)

{

sglCurrentAngle = arrValues[i] / TotalValues * 360;

objGraphics.FillPie(new SolidBrush(GetColor(i)), 220, 95, 100, 100, sglTotalAngle, sglCurrentAngle);

objGraphics.DrawPie(Pens.Black, 220, 95, 100, 100, sglTotalAngle, sglCurrentAngle);

sglTotalAngle += sglCurrentAngle;

}

objBitMap.Save(System.Web.HttpContext.Current.Response.OutputStream, ImageFormat.Gif);

}

//定义颜色

private static Color GetColor(int itemIndex)

{

Color objColor;

if (itemIndex == 0)

{

objColor = Color.Maroon;

}

else if (itemIndex == 1)

{

objColor = Color.Red;

}

else if (itemIndex == 2)

{

objColor = Color.Gray;

}

else if (itemIndex == 3)

{

objColor = Color.Blue;

}

else if (itemIndex == 4)

{

objColor = Color.Orange;

}

else if (itemIndex == 5)

{

objColor = Color.Cyan;

}

else if (itemIndex == 6)

{

objColor = Color.Bisque;

}

else if (itemIndex == 7)

{

objColor = Color.Maroon;

}

else if (itemIndex == 8)

{

objColor = Color.Maroon;

}

else

{

objColor = Color.Blue;

}

return objColor;

}

}

}

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    asp.net中生成饼状与柱状图实例