(七十七)c#Winform自定义控件-采样控件

官网

http://www.hzhcontrols.com

前提

入行已经7,8年了,一直想做一套漂亮点的自定义控件,于是就有了本系列文章。

GitHub:https://github.com/kwwwvagaa/NetWinformControl

码云:https://gitee.com/kwwwvagaa/net_winform_custom_control.git

如果觉得写的还行,请点个 star 支持一下吧

欢迎前来交流探讨: 企鹅群568015492 企鹅群568015492

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NuGet

Install-Package HZH_Controls

目录

https://www.cnblogs.com/bfyx/p/11364884.html

用处及效果

注意观察各个控件交叠的地方,是不是发现他们没有遮挡?这就是这个控件的妙处了。

准备工作

先说明一下这个控件的作用,很多时候我们需要一个图片类型的控件,但是有需要密集的放在一起,如果单纯的设置背景图或image的话  交叠在一起的部分就会存在遮挡现象,所有就有了这个控件。

该控件可以根据设置的采样图片来裁剪有用的绘图区域,这样的好处就是在交叠的时候,无用区域不会遮挡。

这个用GDI+画的,另外也用到了一点三角函数,不明白的话 可以先百度下

开始

添加一个类UCSampling ,继承UserControl

添加属性

 1   /// <summary>
 2         /// The sampling imag
 3         /// </summary>
 4         private Bitmap samplingImag = null;
 5         /// <summary>
 6         /// Gets or sets the sampling imag.
 7         /// </summary>
 8         /// <value>The sampling imag.</value>
 9         [Browsable(true), Category("自定义属性"), Description("采样图片"), Localizable(true)]
10         public Bitmap SamplingImag
11         {
12             get { return samplingImag; }
13             set
14             {
15                 samplingImag = value;
16                 ResetBorderPath();
17                 Invalidate();
18             }
19         }
20 
21         /// <summary>
22         /// The transparent
23         /// </summary>
24         private Color? transparent = null;
25 
26         /// <summary>
27         /// Gets or sets the transparent.
28         /// </summary>
29         /// <value>The transparent.</value>
30         [Browsable(true), Category("自定义属性"), Description("透明色,如果为空,则使用0,0坐标处的颜色"), Localizable(true)]
31         public Color? Transparent
32         {
33             get { return transparent; }
34             set
35             {
36                 transparent = value;
37                 ResetBorderPath();
38                 Invalidate();
39             }
40         }
41 
42         /// <summary>
43         /// The alpha
44         /// </summary>
45         private int alpha = 50;
46 
47         /// <summary>
48         /// Gets or sets the alpha.
49         /// </summary>
50         /// <value>The alpha.</value>
51         [Browsable(true), Category("自定义属性"), Description("当作透明色的透明度,小于此透明度的颜色将被认定为透明,0-255"), Localizable(true)]
52         public int Alpha
53         {
54             get { return alpha; }
55             set
56             {
57                 if (value < 0 || value > 255)
58                     return;
59                 alpha = value;
60                 ResetBorderPath();
61                 Invalidate();
62             }
63         }
64 
65         /// <summary>
66         /// The color threshold
67         /// </summary>
68         private int colorThreshold = 10;
69 
70         /// <summary>
71         /// Gets or sets the color threshold.
72         /// </summary>
73         /// <value>The color threshold.</value>
74         [Browsable(true), Category("自定义属性"), Description("透明色颜色阀值"), Localizable(true)]
75         public int ColorThreshold
76         {
77             get { return colorThreshold; }
78             set
79             {
80                 colorThreshold = value;
81                 ResetBorderPath();
82                 Invalidate();
83             }
84         }
85 
86         /// <summary>
87         /// The bit cache
88         /// </summary>
89         private Bitmap _bitCache;

在大小改变或图片改变时重新计算边界

 1  /// <summary>
 2         /// The m border path
 3         /// </summary>
 4         GraphicsPath m_borderPath = new GraphicsPath();
 5 
 6         /// <summary>
 7         /// Handles the SizeChanged event of the UCSampling control.
 8         /// </summary>
 9         /// <param name="sender">The source of the event.</param>
10         /// <param name="e">The <see cref="EventArgs"/> instance containing the event data.</param>
11         void UCSampling_SizeChanged(object sender, EventArgs e)
12         {
13             ResetBorderPath();
14         }
15 
16         /// <summary>
17         /// Resets the border path.
18         /// </summary>
19         private void ResetBorderPath()
20         {
21             if (samplingImag == null)
22             {
23                 m_borderPath = this.ClientRectangle.CreateRoundedRectanglePath(5);
24             }
25             else
26             {
27                 var bit = new Bitmap(this.ClientRectangle.Width, this.ClientRectangle.Height);
28                 using (var bitg = Graphics.FromImage(bit))
29                 {
30                     bitg.DrawImage(samplingImag, this.ClientRectangle, 0, 0, samplingImag.Width, samplingImag.Height, GraphicsUnit.Pixel);
31                 }
32                 _bitCache = bit;
33                 m_borderPath = new GraphicsPath();
34                 List<PointF> lstPoints = GetBorderPoints(bit, transparent ?? samplingImag.GetPixel(0, 0));
35                 m_borderPath.AddLines(lstPoints.ToArray());
36                 m_borderPath.CloseAllFigures();
37             }
38         }
39 
40         /// <summary>
41         /// Gets the border points.
42         /// </summary>
43         /// <param name="bit">The bit.</param>
44         /// <param name="transparent">The transparent.</param>
45         /// <returns>List&lt;PointF&gt;.</returns>
46         private List<PointF> GetBorderPoints(Bitmap bit, Color transparent)
47         {
48             float diameter = (float)Math.Sqrt(bit.Width * bit.Width + bit.Height * bit.Height);
49             int intSplit = 0;
50             intSplit = (int)(7 - (diameter - 200) / 100);
51             if (intSplit < 1)
52                 intSplit = 1;
53             List<PointF> lstPoint = new List<PointF>();
54             for (int i = 0; i < 360; i += intSplit)
55             {
56                 for (int j = (int)diameter / 2; j > 5; j--)
57                 {
58                     Point p = GetPointByAngle(i, j, new PointF(bit.Width / 2, bit.Height / 2));
59                     if (p.X < 0 || p.Y < 0 || p.X >= bit.Width || p.Y >= bit.Height)
60                         continue;
61                     Color _color = bit.GetPixel(p.X, p.Y);
62                     if (!(((int)_color.A) <= alpha || IsLikeColor(_color, transparent)))
63                     {
64                         if (!lstPoint.Contains(p))
65                         {
66                             lstPoint.Add(p);
67                         }
68                         break;
69                     }
70                 }
71             }
72             return lstPoint;
73         }
74 
75         /// <summary>
76         /// Determines whether [is like color] [the specified color1].
77         /// </summary>
78         /// <param name="color1">The color1.</param>
79         /// <param name="color2">The color2.</param>
80         /// <returns><c>true</c> if [is like color] [the specified color1]; otherwise, <c>false</c>.</returns>
81         private bool IsLikeColor(Color color1, Color color2)
82         {
83             var cv = Math.Sqrt(Math.Pow((color1.R - color2.R), 2) + Math.Pow((color1.G - color2.G), 2) + Math.Pow((color1.B - color2.B), 2));
84             if (cv <= colorThreshold)
85                 return true;
86             else
87                 return false;
88         }
 1  #region 根据角度得到坐标    English:Get coordinates from angles
 2         /// <summary>
 3         /// 功能描述:根据角度得到坐标    English:Get coordinates from angles
 4         /// 作  者:HZH
 5         /// 创建日期:2019-09-28 11:56:25
 6         /// 任务编号:POS
 7         /// </summary>
 8         /// <param name="angle">angle</param>
 9         /// <param name="radius">radius</param>
10         /// <param name="origin">origin</param>
11         /// <returns>返回值</returns>
12         private Point GetPointByAngle(float angle, float radius, PointF origin)
13         {
14             float y = origin.Y + (float)Math.Sin(Math.PI * (angle / 180.00F)) * radius;
15             float x = origin.X + (float)Math.Cos(Math.PI * (angle / 180.00F)) * radius;
16             return new Point((int)x, (int)y);
17         }
18         #endregion

取边界的思路如下:

1,以控件中心为原点,按照一定的角度顺时针依次进行旋转,

2、每次旋转后,按照此角度从外向内,找到第一个不是透明的点记录下来,这就是外边界点

这个取边界算法感觉并不是太好,如果哪位小伙伴有更好的算法,希望可以探讨一下

重绘

 1   protected override void OnPaint(PaintEventArgs e)
 2         {
 3             base.OnPaint(e);
 4             e.Graphics.SetGDIHigh();
 5 
 6             this.Region = new System.Drawing.Region(m_borderPath);
 7            
 8             if (_bitCache != null)
 9                 e.Graphics.DrawImage(_bitCache, 0, 0);
10            
11         }

 

最后的话

如果你喜欢的话,请到 https://gitee.com/kwwwvagaa/net_winform_custom_control 点个星星吧

posted @ 2019-09-28 15:15 冰封一夏 阅读(...) 评论(...) 编辑 收藏
HZHControls控件库官网:http://hzhcontrols.com