C#基础温习(11)：不规则按钮实现

按钮控件在windows forms总是我们使用最多的控件之一了，可是你真的了解它吗？除了修改它的text属性以及该name的名字和增加事件处理的代码你还了解其他吗？ 假如有这样一个需求，我们要做一个不规则的按钮，我们该具体如何实现呢？ 好吧，别的先不多说了，我直接上实例代码。

using System;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Windows.Forms;

namespace Borwer
{

    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        /// <summary>
        /// 返回指定图片中的非透明区域；
        /// </summary>
        /// <param name="img">位图</param>
        /// <param name="alpha">alpha 小于等于该值的为透明</param>
        /// <returns></returns>
        public static GraphicsPath GetNoneTransparentRegion(Bitmap img, byte alpha)
        {
            int height = img.Height;
            int width = img.Width;

            int xStart, xEnd;
            GraphicsPath grpPath = new GraphicsPath();
            for (int y = 0; y < height; y++)
            {
                //逐行扫描；
                for (int x = 0; x < width; x++)
                {
                    //略过连续透明的部分；
                    while (x < width && img.GetPixel(x, y).A <= alpha)
                    {
                        x++;
                    }
                    //不透明部分；
                    xStart = x;
                    while (x < width && img.GetPixel(x, y).A > alpha)
                    {
                        x++;
                    }
                    xEnd = x;
                    if (img.GetPixel(x - 1, y).A > alpha)
                    {
                        grpPath.AddRectangle(new Rectangle(xStart, y, xEnd - xStart, 1));
                    }
                }
            }
            return grpPath;
        }
        private void Form1_Load(object sender, EventArgs e)
        {
            pictureBox1.Visible = false;
            pictbox.Visible = false;
        }

        private void btnCircle_Paint(object sender, PaintEventArgs e)
        {
              Bitmap img = (Bitmap)pictbox.Image;
             GraphicsPath grapth = GetNoneTransparentRegion(img, 10);
           btnCircle.Region = new Region(grapth);

            //要显示的图片设置为窗体背景；
           btnCircle.BackgroundImage = pictbox.Image;
           btnCircle.BackgroundImageLayout = ImageLayout.Zoom;
           //在修改窗体尺寸之前设置窗体为无边框样式；
           btnCircle.Width = pictbox.Image.Width;
           btnCircle.Height = pictbox.Image.Height;
        }

        private void btnCircle_Click(object sender, EventArgs e)
        {
            MessageBox.Show("我是心状不规则按钮");
        }
        private void button1_Paint(object sender, PaintEventArgs e)
        {
            Bitmap img = (Bitmap)pictureBox1.Image;
            GraphicsPath grapth = GetNoneTransparentRegion(img, 10);
            button1.Region = new Region(grapth);

            //要显示的图片设置为窗体背景；
            button1.BackgroundImage = pictureBox1.Image;
            button1.BackgroundImageLayout = ImageLayout.Zoom;
            //在修改窗体尺寸之前设置窗体为无边框样式；
            button1.Width = pictbox.Image.Width;
            button1.Height = pictbox.Image.Height;
        }

        private void button1_Click(object sender, EventArgs e)
        {
            MessageBox.Show("我是苹果不规则按钮");
        }
    }
}

运行结果： [caption id="attachment_870" align="alignnone" width="648"] 不规则按钮效果[/caption] 上面的弹出框是点击心状按钮的回应，怎么样效果实现了吧，你可以选择一些更多的图片去玩玩看看，很爽的效果。