标签：winform style blog io ar color os sp for
接触Winform时间也不长，控件自绘也是刚开始学，现在的打算是一点一点积累，争取能够有点小成果。今天分享的是一个自定义的进度条控件，实现很简单，也没有做什么美化，所以有兴趣的就粗略看看。
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Diagnostics;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Drawing;
using System.Drawing.Drawing2D;
namespace AnnularProgressBarDemo
{
public partial class AnnularProgressBar : Control
{
/// <summary>
/// 前景色，即进度条颜色
/// </summary>
private SolidBrush _ForeBrush = new SolidBrush(Color.Red);
public SolidBrush ForeBrush
{
get { return _ForeBrush; }
set
{
_ForeBrush = value;
Invalidate();
}
}
/// <summary>
/// 遮盖颜色，即环内部的颜色
/// </summary>
private SolidBrush _MaskBrush = new SolidBrush(SystemColors.Control);
public SolidBrush MaskBrush
{
get { return _MaskBrush; }
set
{
_MaskBrush = value;
Invalidate();
}
}
/// <summary>
/// 起始角度
/// </summary>
private float _StartAngle = 0.0f;
public float StartAngle
{
get { return _StartAngle; }
set
{
_StartAngle = value;
Invalidate();
}
}
/// <summary>
/// 跨度
/// </summary>
private float _SweepAngle = 0.0f;
public float SweepAngle
{
get { return _SweepAngle; }
set
{
_SweepAngle = value;
Invalidate();
}
}
/// <summary>
/// 进度
/// </summary>
private float _Value = 0.0f;
public float Value
{
get { return _Value; }
set
{
if (value < _MinValue)
{
_Value = _MinValue;
}
else if (value > _MaxValue)
{
_Value = _MaxValue;
}
else
{
_Value = value;
SweepAngle = (_Value-_MinValue) * 360 / (_MaxValue-_MinValue);
}
Invalidate();
}
}
//最小值
private float _MinValue = 0.0f;
public float MinValue
{
get { return _MinValue; }
set
{
if (value < 0)
{
_MinValue = 0;
}
else
{
_MinValue = value;
}
}
}
/// <summary>
/// 初始值
/// </summary>
private float _InitValue = 0.0f;
public float InitValue
{
get { return _InitValue; }
set
{
if (value < _MinValue)
{
_InitValue = _MinValue;
}
else
{
_InitValue = value;
}
_Value = _InitValue;
SweepAngle = (_InitValue - _MinValue) * 360 / (_MaxValue - _MinValue);
}
}
/// <summary>
/// 最大值
/// </summary>
private float _MaxValue = 0.0f;
public float MaxValue
{
get { return _MaxValue; }
set
{
if (value < _MinValue)
{
_MaxValue = _MinValue;
}
else
{
_MaxValue = value;
}
}
}
/// <summary>
/// 边框颜色
/// </summary>
private Color _BorderColor = Color.Black;
public Color BorderColor
{
get { return _BorderColor; }
set
{
_BorderColor = value;
borderpen = new Pen(BorderColor, BorderWidth);
Invalidate();
}
}
/// <summary>
/// 边框宽度
/// </summary>
private int _BorderWidth = 1;
public int BorderWidth
{
get { return _BorderWidth; }
set
{
_BorderWidth = value;
borderpen = new Pen(BorderColor, BorderWidth);
Invalidate();
}
}
/// <summary>
/// 边框画笔
/// </summary>
private Pen borderpen;
/// <summary>
/// 外轮廓矩形
/// </summary>
private Rectangle OuterRect;
/// <summary>
/// 内轮廓矩形
/// </summary>
private Rectangle InnerRect;
public AnnularProgressBar()
{
InitializeComponent();
this.SetStyle(ControlStyles.UserPaint, true);//自绘
this.SetStyle(ControlStyles.DoubleBuffer, true);// 双缓冲
this.SetStyle(ControlStyles.ResizeRedraw, true);//调整大小时重绘
this.SetStyle(ControlStyles.AllPaintingInWmPaint, true); // 禁止擦除背景.
this.SetStyle(ControlStyles.OptimizedDoubleBuffer, true);// 双缓冲
this.SetStyle(ControlStyles.SupportsTransparentBackColor, true); //透明效果
}
private void Init()
{
borderpen = new Pen(Color.Black, 1);
}
protected override void OnPaint(PaintEventArgs e)
{
base.OnPaint(e);
Graphics graph = e.Graphics;
Image img = new Bitmap(ClientRectangle.Width, ClientRectangle.Height);
Graphics gbmp = Graphics.FromImage(img);
gbmp.SmoothingMode = SmoothingMode.HighQuality;
gbmp.PageUnit = GraphicsUnit.Display;
gbmp.FillPie(ForeBrush, OuterRect, StartAngle, SweepAngle);
gbmp.DrawEllipse(borderpen, OuterRect);
gbmp.FillEllipse(MaskBrush, InnerRect);
gbmp.DrawEllipse(borderpen, InnerRect);
graph.DrawImage(img, ClientRectangle);
}
protected override void OnSizeChanged(EventArgs e)
{
base.OnSizeChanged(e);
OuterRect = ClientRectangle;
OuterRect.Inflate(-1, -1);
InnerRect = new Rectangle(ClientRectangle.X,
ClientRectangle.Y, ClientRectangle.Width,
ClientRectangle.Height);
InnerRect.Inflate(-11, -11);
}
}
}
方法很简单，就是靠GDI+画一个Pie，然后再画一个圆遮住中间的部分，其他的就是靠调节相关的值来实现了。用的话也很简单，初始化MinValue、MaxValue和InitValue值后就可以通过改变Value的值来完成了。
标签：winform style blog io ar color os sp for
原文地址：http://www.cnblogs.com/lvniao/p/4154061.html
