C#用户控件之温度计设计

using System;using System.Collections.Generic;using System.ComponentModel;using System.Drawing;using System.Data;using System.Linq;using System.Text;using System.Threading.Tasks;using System.Windows.Forms;namespace DemoThermometer{  public partial class Thermometer : UserControl  {    #region 属性与构造函数    private int interval = 10;    /// <summary>    /// 刻度间隔    /// </summary>    public int Interval    {      get { return interval; }      set { interval = value; }    }    private int minValue = -50;    /// <summary>    /// 最低温度    /// </summary>    public int MinValue    {      get { return minValue; }      set { minValue = value; }    }    private int maxValue = 50;    /// <summary>    /// 最高温度    /// </summary>    public int MaxValue    {      get { return maxValue; }      set { maxValue = value; }    }    private float curValue = 0;    /// <summary>    /// 当前温度    /// </summary>    public float CurValue    {      get { return curValue; }      set { curValue = value; }    }    private Color thermoColor = Color.Red;    /// <summary>    /// 温度条颜色    /// </summary>    public Color ThermoColor    {      get { return thermoColor; }      set { thermoColor = value; }    }    private Color backGroundColor = Color.SkyBlue;    /// <summary>    /// 温度计背景色    /// </summary>    public Color BackGroundColor    {      get { return backGroundColor; }      set { backGroundColor = value; }    }    private Font thermoFont=new Font("宋体",10,FontStyle.Regular);    /// <summary>    /// 温度计上字体    /// </summary>    public Font ThermoFont    {      get { return thermoFont; }      set { thermoFont = value; }    }    private string thermoTitle = "温度计";    /// <summary>    /// 标题    /// </summary>    public string ThermoTitle    {      get { return this.thermoTitle; }      set { this.thermoTitle = value; }    }    private bool showTip = false;    /// <summary>    /// 是否显示提示    /// </summary>    public bool ShowTip    {      get { return showTip; }      set { showTip = value; }    }    private ToolTip tip=new ToolTip();    public Thermometer()    {      InitializeComponent();    }    #endregion    protected override void OnPaint(PaintEventArgs e)    {            //base.OnPaint(e);      //this.BackColor = this.backGroundColor;      int width = this.Width;      int height = this.Height - 50 ;      Graphics g = e.Graphics;      int c_x = width / 2;      int c_y = height / 2;      int padding = this.Padding.All;//空白      int r = (width - 2 * padding)/2;//半径      int d = 2 * r;//直径      int dis = 2;//两个半圆之间的间隔      int dis2 = 2 * dis;//填充与边框之间的距离      int startAngle1 = -180;      int startAngle2 = 0;      int sweepAngle1 = 180;      //首先画顶端一个半圆      g.DrawPie(Pens.Black, new Rectangle(padding, padding, d, d),startAngle1, sweepAngle1);      g.DrawPie(Pens.Black, new Rectangle(padding+ dis, padding+ dis, d-2* dis, d-2* dis), startAngle1, sweepAngle1);      //填充背景色      g.FillPie(new SolidBrush(this.backGroundColor), new Rectangle(padding + dis2, padding + dis2, d - 2*dis2, d - 2*dis2), startAngle1, sweepAngle1);      //画底端一个半圆      g.DrawPie(Pens.Black, new Rectangle(padding, height-d-padding, d, d), startAngle2, sweepAngle1);      g.DrawPie(Pens.Black, new Rectangle(padding + dis, height-d-padding + dis, d - 2*dis, d - 2*dis), startAngle2, sweepAngle1);      g.FillPie(new SolidBrush(this.backGroundColor), new Rectangle(padding + dis2, height - d - padding+dis2, d - 2*dis2, d - 2*dis2), startAngle2, sweepAngle1);      //画一个矩形      g.DrawRectangle(Pens.Black, new Rectangle(padding, padding + r, d, height - d - 2 * padding));      g.DrawRectangle(Pens.Black, new Rectangle(padding+dis, padding + r+dis, d-2*dis, height - d - 2 * padding-2*dis));      //背景色填充，去掉边界线      g.FillRectangle(new SolidBrush(this.backGroundColor), new Rectangle(padding+3, padding + r-2, 2 * r-6, 6));      g.FillRectangle(new SolidBrush(this.backGroundColor), new Rectangle(padding + 3, height-r-padding-4, 2 * r - 6, 8));      //背景色填充中间部分      g.FillRectangle(new SolidBrush(this.backGroundColor), new Rectangle(padding + dis2, padding + r + dis2, d - 2*dis2, height -d - 2 * padding - 2*dis2));      //画刻度      int s_s_x_1 = padding + r - 20;      int s_s_x_2 = width-padding - r + 20;      int s_s_y = padding + r+4;      int total = this.maxValue - this.minValue;      int scale_width = 5;//刻度宽度      int scale = total / this.interval;      int pscale = (height - 2 * r - 2 * padding) / this.interval;//像素间隔                                          //竖线      g.DrawLine(Pens.Black, new Point(s_s_x_1, s_s_y ), new Point(s_s_x_1, s_s_y + this.interval* pscale));      g.DrawLine(Pens.Black, new Point(s_s_x_2, s_s_y), new Point(s_s_x_2, s_s_y + this.interval * pscale));      for (int i = 0; i <= this.interval; i++) {        //横线刻度        g.DrawLine(Pens.Black, new Point(s_s_x_1- scale_width, s_s_y + i * pscale), new Point(s_s_x_1, s_s_y + i * pscale));        g.DrawLine(Pens.Black, new Point(s_s_x_2, s_s_y + i * pscale), new Point(s_s_x_2 + scale_width, s_s_y + i * pscale));        //画刻度数字        g.DrawString((this.maxValue - (scale * i)).ToString(), this.thermoFont, new SolidBrush( this.ForeColor), new Point(s_s_x_1-35, s_s_y + i * pscale-10));        g.DrawString((this.maxValue - (scale * i)).ToString(), this.thermoFont, new SolidBrush(this.ForeColor), new Point(s_s_x_2 + 10, s_s_y + i * pscale-10));      }      int white_width = 3;//中间白色线宽度      //画条白色细线      g.FillRectangle(Brushes.White, new Rectangle(c_x- white_width, r/2, white_width*2, height-r));      //在底部画一个圆球      g.FillPie(new SolidBrush(this.thermoColor), new Rectangle(c_x-r/2+5, height - r - padding, r-10, r-10), 0, 360);      //根据当前温度画红色线      int red_width = 5;//红色温度线宽度      float ii = ( this.curValue-this.minValue) / this.interval;      g.FillRectangle(new SolidBrush(this.thermoColor), new RectangleF(c_x - red_width, height - r - padding- (ii * pscale)-4, 2* red_width, ii * pscale+5));//此处有一像素的误差      //画标志字符单℃位      g.DrawString("℃", this.thermoFont, new SolidBrush(this.ForeColor), new Point(c_x - 30, r / 2 - 10));      Font titleFont = new Font("宋体", 13, FontStyle.Bold);      //绘制标题      SizeF tsize = g.MeasureString(this.thermoTitle, titleFont);      g.DrawString(this.thermoTitle, titleFont, new SolidBrush(this.ForeColor), new PointF(c_x- (tsize.Width/2), height + 5));      string cur = string.Format("当前温度：{0}℃", this.curValue);      SizeF tsize2 = g.MeasureString(cur, this.thermoFont);      g.DrawString(cur, this.thermoFont, new SolidBrush(this.thermoColor), new PointF(c_x - (tsize2.Width / 2), height + 10+tsize.Height));    }    /// <summary>    /// 当鼠标覆盖进去时    /// </summary>    /// <param name="e"></param>    protected override void OnMouseHover(EventArgs e)    {      this.showTip = true;      //需要显示的内容      int x = this.Width / 2;      int y = (this.Height-50) / 2;      StringBuilder sbTips = new StringBuilder();      //sbTips.AppendLine(this.ThermoTitle);      sbTips.AppendLine(string.Format("当前温度：{0}", this.curValue));      sbTips.AppendLine("单位：℃");      tip.ToolTipTitle = this.ThermoTitle;      tip.IsBalloon = true;      tip.UseFading = true;      //t.SetToolTip(this, sbTips.ToString());      tip.Show(sbTips.ToString(), this, x, y);    }        protected override void OnMouseLeave(EventArgs e)    {      this.showTip = false;      tip.Hide(this);    }  }}