印章WinForm自定義控件封裝，提供源碼下載

看了“康忠鑫-Stephen”的文章(http://www.cnblogs.com/axing/archive/2013/06/04/3116328.html)知道了C#如何通過gdi+繪制圖章。但是嫌原來的代碼封裝不夠，不能實現拖控件，改屬性自定義自己的印章。於是下載了代碼研究了一下，准備把這玩意兒封裝成控件。下面看我如何實現!

分析：

1、WinForm控件的PictureBox比較適合來展示印章圖片，於是自定義控件繼承了PictureBox。

2、把常用屬性進行封裝。

總結：封裝成控件沒啥難度。ACTION!

成品觀賞：

1、設計時

2、運行時

 

 

圖章水印效果：

上代碼：

using System;
using System.Collections.Generic;
using System.Text;
using System.Drawing;
using System.ComponentModel;
using System.Drawing.Drawing2D;
using System.Windows.Forms;

namespace Com.DataCool.SealDesignLib
{
    /// <summary>
    /// 可視化圖章控件繼承PictureBox
    /// </summary>
    public class VisualSealDesignControl : PictureBox
    {
        private string _SealOrgText;
        /// <summary>
        /// SealOrgText 圓形排列環繞五角星的機構全稱等文字
        /// </summary>
        [DefaultValue(typeof(string), "datacool.cnblogs.com"), Category("印章元素"), Description("圖章的機構中英文名稱、網址等.")]
        public string SealOrgText
        {
            get
            {
                return _SealOrgText;
            }
            set
            {
                _SealOrgText = value;
                this.Invalidate();
            }
        }

        private  string _SealOrgCnText;
        /// <summary>
        /// 機構中文簡稱
        /// </summary>
        [DefaultValue(typeof(string), "數據酷軟件"), Category("印章元素"), Description("圖章的機構中文簡稱名稱等.")]
        public string SealOrgCnText
        {
            get
            {
                return _SealOrgCnText;
            }
            set
            {
                _SealOrgCnText = value;
                this.Invalidate();
            }
        }
               
        [Category("SealDesign"), Description("圖章的機構中文簡稱名稱等.")]
        private Font _SealFont = new Font("黑體",16,FontStyle.Bold);
        public Font SealFont
        {
            get
            {
                return _SealFont;
            }
            set
            {
                _SealFont = value;
                this.Invalidate();
            }
        }

        private Color _SealTextColor;
        [DefaultValue(typeof(Color), "Red"), Category("印章元素"), Description("圖章文字顏色.")]
        public Color SealTextColor
        {
            get
            {
                return _SealTextColor;
            }
            set
            {
                _SealTextColor = value;
                this.Invalidate();
            }
        }

        private int _SealSize = 180;
        [DefaultValue(typeof(int), "180"), Category("印章元素"), Description("圖章大小，直徑（像素）.")]   
        public int SealSize
        {
            get
            {
                return _SealSize;
            }
            set
            {
                _SealSize = value;
            }
        }
        
        public VisualSealDesignControl()
        {
            _SealOrgText = "datacool.cnblogs.com";
            _SealOrgCnText = "數據酷軟件";
            SealSize = 180;
            _SealFont = new Font("宋體", 14, FontStyle.Bold);
            _SealTextColor = Color.Red;
            this.Size = new Size(_SealSize, _SealSize);
            this.SizeMode = PictureBoxSizeMode.Zoom;  
        }

        /// <summary>/
        /// 重繪出默認圖片
        /// </summary>
        /// <param name="pe"></param>
        protected override void OnPaint(PaintEventArgs pe)
        {
            if (!DesignMode)
            {
                TextOnSeal _top = new TextOnSeal();
                _top.TextFont = SealFont;
                _top.FillColor = SealTextColor;
                _top.ColorTOP = Color.Black;
                _top.Text = SealOrgText;
                _top.BaseString = SealOrgCnText;
                _top.ShowPath = true;
                _top.LetterSpace = 2;
                _top.SealSize = 180;
                _top.CharDirection = Char_Direction.Center;
                _top.SetIndent(20);
                pe.Graphics.DrawImage(_top.TextOnPathBitmap(), 0, 0);
            }
        }    
    }

    public enum Char_Direction
    {
        Center = 0,
        OutSide = 1,
        ClockWise = 2,
        AntiClockWise = 3,
    }
}

關鍵點解釋：

1、重寫PictureBox的OnPaint實際調用TextOnSeal生成圖片。

  /// <summary>/
        /// 重繪出默認圖片
        /// </summary>
        /// <param name="pe"></param>
        protected override void OnPaint(PaintEventArgs pe)
        {
            if (!DesignMode)
            {
                TextOnSeal _top = new TextOnSeal();
                _top.TextFont = SealFont;
                _top.FillColor = SealTextColor;
                _top.ColorTOP = Color.Black;
                _top.Text = SealOrgText;
                _top.BaseString = SealOrgCnText;
                _top.ShowPath = true;
                _top.LetterSpace = 2;
                _top.SealSize = 180;
                _top.CharDirection = Char_Direction.Center;
                _top.SetIndent(20);
                pe.Graphics.DrawImage(_top.TextOnPathBitmap(), 0, 0);
            }
        }    

 2、屬性變化時，重繪圖片進行刷新

在屬性的Set里強制控件進行刷新，觸發OnPaint事件進行重畫。

完整源碼下載：請猛擊這里喔！

PS:可能有些童鞋覺得無意義。自己覺得喜歡就好。我拖拖拖，拖控件有益身體健康...