水桶

1 效果图

 

 

2 代码编写

/// <summary>
    /// 水桶
    /// </summary>
    public partial class UCWaterTank : UserControl
    {
        public UCWaterTank()
        {
            InitializeComponent();
            this.SetStyle(ControlStyles.AllPaintingInWmPaint, true);
            this.SetStyle(ControlStyles.DoubleBuffer, true);
            this.SetStyle(ControlStyles.ResizeRedraw, true);
            this.SetStyle(ControlStyles.Selectable, true);
            this.SetStyle(ControlStyles.SupportsTransparentBackColor, true);
            this.SetStyle(ControlStyles.UserPaint, true);
            RectWidth = 2;
           // this.SizeChanged += UCWaterTank_SizeChanged;
            this.Size = new Size(100, 200);
            //valueRect = new Rectangle(this.RectWidth, this.Location.Y + (this.Height - this.Value), this.Width - 2 * RectWidth, this.Value);
         
          
        }

        private RectangleF valueRect;

        int m_value;
        [Description("当前值"), Category("自定义")]
        public int Value
        {
            set
            {
                if (value > m_maxValue)
                    m_value = m_maxValue;
                else if (value < 0)
                    m_value = 0;
                else
                    m_value = value;
                //if (ValueChanged != null)
                //    ValueChanged(this, null);
                Refresh();
            }
            get
            {
                return m_value;
            }
        }

        private int m_maxValue = 100;

        [Description("最大值"), Category("自定义")]
        public int MaxValue
        {
            get { return m_maxValue; }
            set
            {
                if (value < m_value)
                    m_maxValue = m_value;
                else
                    m_maxValue = value;
                Refresh();
            }
        }

    

        [Description("值颜色"), Category("自定义")]
        private Color valueColor = Color.Blue;
        public Color ValueColor
        {
            get { return valueColor; }
            set
            {
                valueColor = value;
                Refresh();
            }
        }

        [Description("边框宽度"), Category("自定义")]
        private int rectWidth = 1;
        public  int RectWidth
        {
            get
            {
                return rectWidth;
            }
            set
            {
                rectWidth = value;
                Refresh();
            }
        }

        [Description("边框颜色"), Category("自定义")]
        private Color borderColor = Color.Blue;
        public Color BorderColor
        {
            get { return borderColor; }
            set
            {
                borderColor = value;
                Refresh();
            }
        }


        //void UCWaterTank_SizeChanged(object sender, EventArgs e)
        //{
        //    valueRect = new Rectangle(this.RectWidth, this.Location.Y + (this.Height - this.Value), this.Width - 2 * RectWidth, this.Value);
        //}

        protected override void OnSizeChanged(EventArgs e)
        {
            base.OnSizeChanged(e);
            float f = (float)this.Height / (float)MaxValue;
            float fheight = (float)this.Value * f;
            valueRect = new RectangleF(this.RectWidth, this.Location.Y + (this.Height - fheight), this.Width - 2 * RectWidth, fheight);
        }

        protected override void OnPaint(PaintEventArgs e)
        {
            base.OnPaint(e);
            Graphics g = e.Graphics;
            g.SmoothingMode = SmoothingMode.AntiAlias;
            Pen pen = new Pen(new SolidBrush(BorderColor), (float)RectWidth);
            Rectangle rect = new Rectangle(0, 0, this.Width-1, this.Height-1);
            g.DrawRectangle(pen, rect);
            float f = (float)this.Height / (float)MaxValue;
            float fheight = (float)this.Value * f;
            valueRect = new RectangleF(this.RectWidth,  (this.Height - fheight), this.Width - 2 * RectWidth, fheight);
            g.FillRectangle(new SolidBrush(ValueColor), valueRect);
           
        }
    }