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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
namespace GMapTest
{
public partial class FrmMeter : Form
{
public FrmMeter()
{
InitializeComponent();
MaxValue = 270;
ChangeValue = 69;
DrawBackImg();
//this.BackgroundImage = GMapTest.Properties.Resources.bdi;
}
//为了方式绘制指针时产生的闪烁，PictureBox添加该事件方法
private void pic_Paint(object sender, PaintEventArgs e)
{
//DrawForeImg(e.Graphics);
}
private double _maxValue;
public double MaxValue {
get { return _maxValue; }
set { _maxValue = value; }
}
private double _changeValue;
public double ChangeValue
{
get { return _changeValue; }
set
{
if (value <= _maxValue)
_changeValue = value;
else
{
//完成自适应性
MaxValue = value;
_changeValue = value;
}
//通过该方法，可以使指针自动绘制（其实就是强制重绘）
//pic.Invalidate();
}
}
//指针的具体画法
private void DrawForeImg(Graphics gp)
{
Bitmap bit = new Bitmap(this.Width, this.Height);
Graphics g = Graphics.FromImage(bit);
g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
//画针
DrawPin(g);
DrawString(g);
//注意此处的绘制方式，这样可以有效减少界面的闪烁问题。
gp.DrawImage(bit, new Point(0, 0));
g.Dispose();
}
private readonly int _diameter = 300;
private Color _pinColor = Color.CornflowerBlue;
private string _unitStr = "AUC";
private Color _frameColor = Color.SkyBlue;
private StringFormat strFormat = StringFormat.GenericTypographic;
private double _PinLen = 130;
private double NxPinLen =10;
//画针
private void DrawPin(Graphics g)
{
int cer = _diameter / 2;
float start = 135;
float sweepShot = (float)(_changeValue / _maxValue * 270);
Pen linePen = new Pen(_pinColor, 1);
Pen NxPen = new Pen(_pinColor, 2);
Pen xPen = new Pen(_pinColor, 5);
double rad = (sweepShot + start) * Math.PI / 180;
float radius = _diameter / 2 - 5;
int dx = (int)(cer + (_PinLen) * Math.Cos(rad));
int dy = (int)(cer + (_PinLen) * Math.Sin(rad));
int px = (int)(cer + (_PinLen * 0.4) * Math.Cos(rad));
int py = (int)(cer + (_PinLen * 0.4) * Math.Sin(rad));
int nx = (int)(cer - (NxPinLen) * Math.Sin(rad));
int ny = (int)(cer - (NxPinLen) * Math.Cos(rad));
g.DrawLine(linePen, new Point(cer, cer), new Point(dx, dy));
g.DrawLine(NxPen, new Point(cer, cer), new Point(px, py));
g.DrawLine(xPen, new Point(cer, cer), new Point(ny, nx));
}
//绘制在仪表下面的值
private void DrawString(Graphics g)
{
int cer = _diameter / 2;
string str = _changeValue.ToString("F2");
g.DrawString(str, new Font("宋体", 9), new SolidBrush(_pinColor), new PointF(cer, (float)(cer + cer * 0.4)), strFormat);
}
// 绘制背景 用来总体控制背景的绘制
private void DrawBackImg()
{
Bitmap bit = new Bitmap(this.Width, this.Height);
Graphics gp = Graphics.FromImage(bit);
gp.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
#region 在这里可以扩展需要绘制的背景项目
//外框
drawFrame(gp);
// 画刻度
DrawRuling(gp);
//画点
drawPoint(gp);
//绘制单位
DrawUnitStr(gp);
#endregion
//当绘制完成后，直接直接设置为背景
DrawForeImg(gp);
this.panel1.BackgroundImage = bit;
}
//绘制单位
private void DrawUnitStr(Graphics gp)
{
int cer = _diameter / 2;
gp.DrawString(_unitStr, new Font("宋体", 10), new SolidBrush(_frameColor), new PointF(cer, (float)(cer - cer * 0.3)), strFormat);
}
/// <summary>
/// 画外框
/// </summary>
/// <param name="gp"></param>
private void drawFrame(Graphics gp)
{
Pen pen = new Pen(_frameColor, 2);
Rectangle rec = new Rectangle(5, 5, _diameter - 10, _diameter - 10);
Rectangle reci = new Rectangle(7, 7, _diameter - 14, _diameter - 14);
gp.FillEllipse(Brushes.Black, rec);
gp.DrawEllipse(pen, reci);
}
// 画刻度 此次较为复杂，主要是在绘制刻度值时需要处理
private void DrawRuling(Graphics gp)
{
//刻度
int cerX = _diameter / 2;
int cerY = _diameter / 2;
//这里需要注意，因外在上面的图中标识了rad=0的位置，而我们的仪表时270度的，0点在135度处，
//为了符合该效果所以起始位置设为135度。
float start = 135;
float sweepShot = 0;
int dx = 0;
int dy = 0;
int soildLenght = 8;
Pen linePen = new Pen(Color.White, 1);
float span = (float)(_maxValue / 30);
float sp = 0;
//用于右边数字右对齐
StringFormat stf = new StringFormat();
stf.Alignment = StringAlignment.Far;
StringFormat stfMid = new StringFormat();
stfMid.Alignment = StringAlignment.Center;
stfMid.LineAlignment = StringAlignment.Center;
for (int i = 0; i <= 30; i++)
{
//注意此处，C#提供的三角函数计算中使用的弧度值，而此处获取的是角度值，需要转化
double rad = (sweepShot + start) * Math.PI / 180;
float radius = _diameter / 2 - 5;
int px = (int)(cerX + (radius-20) * Math.Cos(rad));
int py = (int)(cerY + (radius - 20) * Math.Sin(rad));
if (sweepShot % 15 == 0)
{
linePen.Width = 2;
//计算刻度中的粗线
dx = (int)(cerX + (radius - 20 - soildLenght) * Math.Cos(rad));
dy = (int)(cerY + (radius - 20 - soildLenght) * Math.Sin(rad));
//绘制刻度值，注意字串对其方式
string str = sp.ToString("f0");
if (sweepShot <= 45)
{
gp.DrawString(str, new Font("宋体", 9), new SolidBrush(_frameColor), new PointF(dx, dy - 5));
}
else if (sweepShot > 45 && sweepShot < 135)
{
gp.DrawString(str, new Font("宋体", 9), new SolidBrush(_frameColor), new PointF(dx, dy));
}
else if (sweepShot == 135)
{
gp.DrawString(str, new Font("宋体", 9), new SolidBrush(_frameColor), new PointF(dx, dy + 10), stfMid);
}
else if (sweepShot > 135 && sweepShot < 225)
{
gp.DrawString(str, new Font("宋体", 9), new SolidBrush(_frameColor), new PointF(dx, dy), stf);
}
else if (sweepShot >= 225)
{
gp.DrawString(str, new Font("宋体", 9), new SolidBrush(_frameColor), new PointF(dx, dy - 5), stf);
}
}
else
{
//计算刻度中细线
linePen.Width = 1;
dx = (int)(cerX + (radius - 20 - soildLenght + 2) * Math.Cos(rad));
dy = (int)(cerY + (radius - 20 - soildLenght + 2) * Math.Sin(rad));
}
//绘制刻度线
gp.DrawLine(linePen, new Point(px, py), new Point(dx, dy));
sp += span;
sweepShot += 9;
}
}
//画中间的点
private void drawPoint(Graphics gp)
{
Pen p = new Pen(_frameColor);
int tmpWidth = 6;
int px = _diameter / 2 - tmpWidth;
gp.DrawEllipse(p, new Rectangle(px, px, 2 * tmpWidth, 2 * tmpWidth));
//在画点时，我使用了指针的颜色，这样看起来，更真实一点
gp.FillEllipse(new SolidBrush(_pinColor), new Rectangle(px + 2, px + 2, 2 * tmpWidth - 4, 2 * tmpWidth - 4));
}
private void panel1_Paint(object sender, PaintEventArgs e)
{
//DrawBackImg();
}
}
}