using System;
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using System.ComponentModel;
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using System.Drawing;
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using System.Drawing.Drawing2D;
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using System.Windows.Forms;
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namespace WinCustControls
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{
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public partial class UCWaterTank : UserControl
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{
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public UCWaterTank()
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{
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InitializeComponent();
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SetStyle(ControlStyles.AllPaintingInWmPaint, true);//忽略窗口消息，减少闪烁
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SetStyle(ControlStyles.OptimizedDoubleBuffer, true);//绘制到缓冲区，减少闪烁
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SetStyle(ControlStyles.UserPaint, true);//控件由其自身而不是操作系统绘制
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SetStyle(ControlStyles.ResizeRedraw, true);//控件调整其大小时重绘
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SetStyle(ControlStyles.SupportsTransparentBackColor, true);//支持透明背景
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RectWidth = 2;
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this.Size = new Size(100, 200);
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}
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float fRatio = 0.0f;
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float fHeight = 0.0f;//实际水位高度
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private RectangleF valueRect;//水位深度矩形
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private int mValue;
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//中心放射颜色
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[DefaultValue(typeof(int), "0"), Description("当前水位值")]
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public int Value
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{
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get { return mValue; }
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set
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{
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if (value > maxValue)
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mValue = maxValue;
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else if (value < 0)
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mValue = 0;
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else
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mValue = value;
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UpdateHeight();//更新比例数 实际矩形区域
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Invalidate();
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}
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}
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private int maxValue = 100;
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//中心放射颜色
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[DefaultValue(typeof(int), "100"), Description("最大水位值")]
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public int MaxValue
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{
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get { return maxValue; }
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set
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{
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if (value < mValue)
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maxValue = mValue;
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else
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maxValue = value;
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UpdateHeight();//更新比例数 实际矩形区域
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Invalidate();
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}
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}
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private Color valueColor = Color.Blue;
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[DefaultValue(typeof(Color), "Blue"), Description("水位深度颜色")]
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public Color ValueColor
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{
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get { return valueColor; }
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set
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{
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valueColor = value;
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Invalidate();
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}
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}
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private Color borderColor = Color.Gray;
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[DefaultValue(typeof(Color), "Gray"), Description("水池的边框颜色")]
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public Color BorderColor
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{
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get { return borderColor; }
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set
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{
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borderColor = value;
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Invalidate();
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}
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}
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private int rectWidth = 1;
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//中心放射颜色
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[DefaultValue(typeof(int), "1"), Description("水池的边框粗细")]
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public int RectWidth
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{
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get { return rectWidth; }
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set
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{
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rectWidth = value;
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UpdateHeight();//更新比例数 实际矩形区域
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Invalidate();
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}
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}
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/// <summary>
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/// 更新内部矩形的实际高度
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/// </summary>
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private void UpdateHeight()
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{
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UpdateRatio();
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//水位高度
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fHeight = (float)Value * fRatio;
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//水位的矩形结构
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valueRect = new RectangleF(rectWidth, Height - fHeight - rectWidth, Width - 2 * rectWidth - 1, fHeight);
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}
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/// <summary>
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/// 计算水池高度与最大水位值之间比例值
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/// </summary>
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private void UpdateRatio()
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{
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fRatio = (float)(Height - 2 * RectWidth) / (float)MaxValue;
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}
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protected override void OnSizeChanged(EventArgs e)
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{
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base.OnSizeChanged(e);
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UpdateHeight();
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}
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protected override void OnPaint(PaintEventArgs e)
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{
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base.OnPaint(e);
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Graphics g = e.Graphics;
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g.SmoothingMode = SmoothingMode.AntiAlias;
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//画边框线的pen对象
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Pen pen = new Pen(new SolidBrush(borderColor), RectWidth);
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Rectangle rect = new Rectangle(0, 0, this.Width - 1, Height - 1);
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//外边框圆角矩形
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GraphicsPath rectPath = PaintClass.GetRoundRectangle(rect, 5);
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//填充水位
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g.FillRectangle(new SolidBrush(ValueColor), valueRect);
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//画边框
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g.DrawPath(pen, rectPath);
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}
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}
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}
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