Question

asp.net中怎样实现类似于CPU的曲线图？？？？急……

背景有栅格……要实现实时更新曲线……X轴的随时间的变化而增长……哪位大侠会啊……请指教……谢谢？？？？？？？？？？？？非常急……如能解决悬赏一百分……

Answer 1

你可以参考该源码编写：http://www.codeproject.com/KB/miscctrl/SimplePerfChart.aspx?df=100&forumid=384678&exp=0&select=1888300

用下面的代码可以获取CPU所有的计数器
System.Diagnostics.PerformanceCounterCategory mycat = new
System.Diagnostics.PerformanceCounterCategory("Process");

用counter.NextValue()去获取每一个计数器当前的值

using System;
using System.Collections.Generic;
using System.Text;
using System.Drawing;
using System.Drawing.Drawing2D;

namespace CNPOPSOFT.Controls
{
[Serializable]
public class CustomRectangle
{
public CustomRectangle()
{
}

public CustomRectangle(float x, float y, float width, float height)
{
this.x = x;
this.y = y;
this.width = width;
this.height = height;
}

#region 属性定义区

private float x;
/// <summary>
/// X坐标
/// </summary>
public float X
{
get { return x; }
set { x = value; }
}

private float y;
/// <summary>
/// Y坐标
/// </summary>
public float Y
{
get { return y; }
set { y = value; }
}

/// <summary>
/// X坐标
/// </summary>
public float Left
{
get { return x; }
set { x = value; }
}

/// <summary>
/// Y坐标
/// </summary>
public float Top
{
get { return y; }
set { y = value; }
}

private float width;
/// <summary>
/// 宽度
/// </summary>
public float Width
{
get { return width; }
set { width = value; }
}

private float height;
/// <summary>
/// 高度
/// </summary>
public float Height
{
get { return height; }
set { height = value; }
}

/// <summary>
/// 返回右边X轴坐标（等于X+Width）
/// </summary>
public float Right
{
get { return x + width; }
}

/// <summary>
/// 返回底部Y轴坐标（等于Y+Height）
/// </summary>
public float Bottom
{
get { return y + height; }
}

/// <summary>
/// 返回矩形中点
/// </summary>
public CustomPoint CenterPoint
{
get { return new CustomPoint(x + width / 2, y + height / 2); }
}

#endregion

#region 方法区

/// <summary>
/// 返回一个克隆的对象
/// </summary>
/// <returns></returns>
public CustomRectangle Clone()
{
return new CustomRectangle(x, y, width, height);
}

/// <summary>
/// 转化为Rectangle对象
/// </summary>
/// <returns></returns>
public Rectangle ToRectangle()
{
return new Rectangle((int)x, (int)y, (int)width, (int)height);
}

/// <summary>
/// 转化为RectangleF对象
/// </summary>
/// <returns></returns>
public RectangleF ToRectangleF()
{
return new RectangleF(x, y, width, height);
}

/// <summary>
/// 返回一个左上角坐标点
/// </summary>
/// <returns></returns>
public Point ToPoint()
{
return new Point((int)x, (int)y);
}

/// <summary>
/// 返回一个左上角坐标点
/// </summary>
/// <returns></returns>
public PointF ToPointF()
{
return new PointF(x, y);
}

/// <summary>
/// 判断指定坐标的点是否在矩形内部
/// </summary>
/// <param name="ptX">X坐标</param>
/// <param name="ptY">Y坐标</param>
/// <returns></returns>
public bool IsPointInRectangle(int ptX, int ptY)
{
return (ptX >= x && ptX <= (x + width) && ptY >= y && ptY <= (y + height));
}

/// <summary>
/// 判断指定坐标的点是否在矩形内部
/// </summary>
/// <param name="ptX">X坐标</param>
/// <param name="ptY">Y坐标</param>
/// <returns></returns>
public bool IsPointFInRectangle(float ptX, float ptY)
{
return (ptX >= x && ptX <= (x + width) && ptY >= y && ptY <= (y + height));
}

public static CustomRectangle ToCustomRectangle(RectangleF re)
{
CustomRectangle cus = new CustomRectangle();
cus.X = re.X;
cus.Y = re.Y;
cus.Width = re.Width;
cus.Height = re.Height;
return cus;
}

/// <summary>
/// 根据Rectangle产生一个CustomRectangle对象
/// </summary>
/// <param name="rect"></param>
/// <returns></returns>
public static CustomRectangle FromRectangle(Rectangle rect)
{
return new CustomRectangle(rect.Left, rect.Top, rect.Width, rect.Height);
}

/// <summary>
/// 根据RectangleF产生一个CustomRectangle对象
/// </summary>
/// <param name="rect"></param>
/// <returns></returns>
public static CustomRectangle FromRectangleF(RectangleF rect)
{
return new CustomRectangle(rect.Left, rect.Top, rect.Width, rect.Height);
}

/// <summary>
/// 获取边框的圆角矩形路径（用于绘图）
/// </summary>
/// <returns></returns>
public GraphicsPath GetRoundRectBorderPath(float radus)
{
GraphicsPath path = new GraphicsPath();
path.AddArc(x, y, radus * 2, radus * 2, 180, 90);
path.AddArc(Right - radus * 2, y, radus * 2, radus * 2, 270, 90);
path.AddArc(Right - radus * 2, Bottom - radus * 2, radus * 2, radus * 2, 0, 90);
path.AddArc(x, Bottom - radus * 2, radus * 2, radus * 2, 90, 90);
path.CloseFigure();
return path;
}

/// <summary>
/// 获取六边形绘图路径
/// </summary>
/// <returns></returns>
public GraphicsPath GetHexagonBorderPath()
{
GraphicsPath path = new GraphicsPath();
List<PointF> pts = new List<PointF>();
pts.Add(new PointF(x + width / 2f, y));
pts.Add(new PointF(Right, y + height / 4f));
pts.Add(new PointF(Right, y + height * 3f / 4f));
pts.Add(new PointF(x + width / 2f, Bottom));
pts.Add(new PointF(x, y + height * 3f / 4f));
pts.Add(new PointF(x, y + height / 4f));
path.AddPolygon(pts.ToArray());
return path;
}

/// <summary>
/// 获取倒三角形路径
/// </summary>
/// <returns></returns>
public GraphicsPath GetTrianglePath()
{
GraphicsPath path = new GraphicsPath();
List<PointF> pts = new List<PointF>();
pts.Add(new PointF(x, y));
pts.Add(new PointF(Right, y));
pts.Add(new PointF(x + width / 2f, Bottom));
path.AddPolygon(pts.ToArray());
return path;
}

/// <summary>
/// 根据鼠标位置确定高亮区域，1、2、3、4表示中间4个区域，其他为-1
/// </summary>
/// <param name="pt"></param>
/// <returns></returns>
public int GetHotPosition(Point pt)
{
Point pt1, pt2, pt3, pt4, pt0;
pt1 = new Point((int)(x + width / 6), (int)(y + height / 6));
pt2 = new Point((int)(Right - width / 6), (int)(y + height / 6));
pt3 = new Point((int)(Right - width / 6), (int)(Bottom - height / 6));
pt4 = new Point((int)(x + width / 6), (int)(Bottom - height / 6));
pt0 = CenterPoint.ToPoint();

GraphicsPath path1 = new GraphicsPath();
path1.AddPolygon(new Point[] { pt1, pt2, pt0 });
if (path1.IsVisible(pt)) return 1;

GraphicsPath path2 = new GraphicsPath();
path2.AddPolygon(new Point[] { pt2, pt3, pt0 });
if (path2.IsVisible(pt)) return 2;

GraphicsPath path3 = new GraphicsPath();
path3.AddPolygon(new Point[] { pt3, pt4, pt0 });
if (path3.IsVisible(pt)) return 3;

GraphicsPath path4 = new GraphicsPath();
path4.AddPolygon(new Point[] { pt4, pt1, pt0 });
if (path4.IsVisible(pt)) return 4;

return -1;
}

/// <summary>
/// 获取高亮矩形区域
/// </summary>
/// <param name="hotPosition">1,2,3,4；0表示全选</param>
/// <returns></returns>
public Rectangle GetSubRectangle(int hotPosition)
{
if (hotPosition == 1)
return new Rectangle((int)x, (int)y, (int)width, (int)(height / 2));
else if (hotPosition == 2)
return new Rectangle((int)(x + width / 2), (int)y, (int)(width / 2), (int)height);
else if (hotPosition == 3)
return new Rectangle((int)x, (int)(y + height / 2), (int)width, (int)(height / 2));
else if (hotPosition == 4)
return new Rectangle((int)x, (int)y, (int)(width / 2), (int)height);
else
return ToRectangle();
}

#endregion

}
}

模仿Vista侧边栏的CPU仪表盘控件，基本方法和前面发布的VistaClock控件原理相同，如图：http://www.cnpopsoft.com/attachments/month_0801/7200818135252.jpg

下载

http://www.cnpopsoft.com/attachments/month_0801/s200818135029.rar

不知道以下代码对你有没有帮助

#include <windows.h>
#include <conio.h>
#include <stdio.h>
#define SystemBasicInformation 0
#define SystemPerformanceInformation 2
#define SystemTimeInformation 3
#define Li2Double(x) ((double)((x).HighPart) * 4.294967296E9 + (double)((x).LowPart))
typedef struct
{
DWORD dwUnknown1;
ULONG uKeMaximumIncrement;
ULONG uPageSize;
ULONG uMmNumberOfPhysicalPages;
ULONG uMmLowestPhysicalPage;
ULONG uMmHighestPhysicalPage;
ULONG uAllocationGranularity;
PVOID pLowestUserAddress;
PVOID pMmHighestUserAddress;
ULONG uKeActiveProcessors;
BYTE bKeNumberProcessors;
BYTE bUnknown2;
WORD wUnknown3;
} SYSTEM_BASIC_INFORMATION;
typedef struct
{
LARGE_INTEGER liIdleTime;
DWORD dwSpare[76];
} SYSTEM_PERFORMANCE_INFORMATION;
typedef struct
{
LARGE_INTEGER liKeBootTime;
LARGE_INTEGER liKeSystemTime;
LARGE_INTEGER liExpTimeZoneBias;
ULONG uCurrentTimeZoneId;
DWORD dwReserved;
} SYSTEM_TIME_INFORMATION;
typedef LONG (WINAPI *PROCNTQSI)(UINT,PVOID,ULONG,PULONG);
PROCNTQSI NtQuerySystemInformation;
void main()
{
SYSTEM_PERFORMANCE_INFORMATION SysPerfInfo;
SYSTEM_TIME_INFORMATION SysTimeInfo;
SYSTEM_BASIC_INFORMATION SysBaseInfo;
double dbIdleTime;
double dbSystemTime;
LONG status;
LARGE_INTEGER liOldIdleTime = {0,0};
LARGE_INTEGER liOldSystemTime = {0,0};
NtQuerySystemInformation = (PROCNTQSI)GetProcAddress(GetModuleHandle("ntdll"),"NtQuerySystemInformation");
if (!NtQuerySystemInformation) return;
// get number of processors in the system
status = NtQuerySystemInformation(SystemBasicInformation,&SysBaseInfo,sizeof(SysBaseInfo),NULL);
if (status != NO_ERROR) return;
int amount=0;
//printf("\n您的CPU使用率为： ");
while(!_kbhit())
{
//设置新的系统时间：
amount++;
status = NtQuerySystemInformation(SystemTimeInformation,&SysTimeInfo,sizeof(SysTimeInfo),0);
if (status!=NO_ERROR) return;
status = NtQuerySystemInformation(SystemPerformanceInformation,&SysPerfInfo,sizeof(SysPerfInfo),NULL);
if (status != NO_ERROR) return;
if (liOldIdleTime.QuadPart != 0)
{
dbIdleTime = Li2Double(SysPerfInfo.liIdleTime) - Li2Double(liOldIdleTime);
dbSystemTime = Li2Double(SysTimeInfo.liKeSystemTime) - Li2Double(liOldSystemTime);
dbIdleTime = dbIdleTime / dbSystemTime;
dbIdleTime = 100.0 - dbIdleTime * 100.0 / (double)SysBaseInfo.bKeNumberProcessors;
int c=(int)dbIdleTime;
printf("\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b%d---%d%%",amount,c);
}
//改变新的CPU使用率和系统时间
liOldIdleTime = SysPerfInfo.liIdleTime;
liOldSystemTime = SysTimeInfo.liKeSystemTime;
Sleep(1000);
}
printf("\n");
}