本文來源于網頁設計愛好者web開發社區http://www.html.org.cn收集整理，歡迎訪問。這里是從dataset里的數據生成曲線圖.
我的dataset是從表sendrec里讀取的數據,分別有id,sendid(訂單號),sendtime(記錄時間),sendnum(單位時間發送量/我這里是五分鐘)幾個字段
過程如下:
public void draw(page page,dataset ds,int tnum){}
其中page是用來傳遞引用這個過程的頁面,這樣讓頁面是jpg方式直接向客戶端輸出生成的曲線圖.
ds就是取出來的數據集了
tnum只是我這里要用到的一個參數,不想讓這個類去接觸讀取過程,所以把訂單的總量直接取出后傳遞給它的.
using system;
using system.data;
using system.configuration;
using system.web;
using system.web.security;
using system.web.ui;
using system.web.ui.webcontrols;
using system.web.ui.htmlcontrols;
using system.drawing.drawing2d;
using system.drawing.imaging;
using system.drawing;
using system.io;
public class imgdraw
{
public imgdraw()
{
}
public void draw(page page,dataset ds,int tnum)
{
//取得記錄數量
int count = ds.tables[0].rows.count;
//記算圖表寬度
int wd = 80 + 20 * (count - 1);
//設置最小寬度為800
if (wd < 800) wd = 800;
//生成bitmap對像
bitmap img=new bitmap(wd,400);
//生成繪圖對像
graphics g = graphics.fromimage(img);
//定義黑色畫筆
pen bp = new pen(color.black);
//定義紅色畫筆
pen rp = new pen(color.red);
//定義銀灰色畫筆
pen sp = new pen(color.silver);
//定義大標題字體
font bfont = new font("arial", 12, fontstyle.bold);
//定義一般字體
font font = new font("arial", 6);
//定義大點的字體
font tfont = new font("arial", 9);
//繪制底色
g.drawrectangle(new pen(color.white, 400), 0, 0, img.width, img.height);
//定義黑色過渡型筆刷
lineargradientbrush brush = new lineargradientbrush(new rectangle(0, 0,img.width, img.height), color.black, color.black, 1.2f, true);
//定義藍色過渡型筆刷
lineargradientbrush bluebrush = new lineargradientbrush(newrectangle(0, 0, img.width, img.height), color.blue, color.blue, 1.2f,true);
//繪制大標題
g.drawstring(ds.tables[0].rows[0]["sendid"].tostring() + "號訂單發送情況曲線圖", bfont, brush, 40, 5);
//取得當前發送量
int nums=0;
for (int i = 0; i < count; i++)
{
nums+=convert.toint32(ds.tables[0].rows[i]["sendnum"]);
}
//繪制信息簡報
string info="訂單發送時間："+ds.tables[0].rows[0]["sendtime"].tostring()+" 曲線圖生成時間："+datetime.now.tostring()+" 訂單總量："+tnum.tostring()+" 當前發送總量："+nums.tostring();
g.drawstring(info, tfont, bluebrush, 40, 25);
//繪制圖片邊框
g.drawrectangle(bp, 0, 0, img.width - 1, img.height - 1);
//繪制豎坐標線
for (int i = 0; i < count; i++)
{
g.drawline(sp, 40+20 * i, 60, 40+20 * i, 360);
}
//繪制時間軸坐標標簽
for (int i = 0; i < count; i+=2)
{
string st = convert.todatetime(ds.tables[0].rows[i]["sendtime"]).tostring("hh:mm");
g.drawstring(st, font, brush, 30 + 20 * i, 370);
}
//繪制橫坐標線
for (int i = 0; i < 10; i++)
{
g.drawline(sp, 40, 60+30*i, 40+20*(count-1), 60+30*i);
int s = 2500 - 50 * i * 5;
//繪制發送量軸坐標標簽
g.drawstring(s.tostring(), font, brush, 10, 60 + 30 * i);
}
//繪制豎坐標軸
g.drawline(bp, 40, 55, 40, 360);
//繪制橫坐標軸
g.drawline(bp, 40, 360, 45 + 20 * (count - 1), 360);
//定義曲線轉折點
point[] p = new point[count];
for (int i = 0; i < count; i++)
{
p[i].x = 40 + 20 * i;
p[i].y = 360- convert.toint32(ds.tables[0].rows[i]["sendnum"]) / 5*3/5;
}
//繪制發送曲線
g.drawlines(rp, p);
for (int i = 0; i < count; i++)
{
//繪制發送記錄點的發送量
g.drawstring(ds.tables[0].rows[i]["sendnum"].tostring(), font, bluebrush, p[i].x, p[i].y - 10);
//繪制發送記錄點
g.drawrectangle(rp, p[i].x - 1, p[i].y - 1, 2, 2);
}
//繪制豎坐標標題
g.drawstring("發送量", tfont, brush, 5, 40);
//繪制橫坐標標題
g.drawstring("發送時間", tfont, brush, 40, 385);
//保存繪制的圖片
memorystream stream = new memorystream();
img.save(stream, imageformat.jpeg);
//圖片輸出
page.response.clear();
page.response.c;
page.response.binarywrite(stream.toarray());
}
}
