学步园

本小程序功能：在图片上取某一点的颜色
主要代码如下：

using System;
using System.Diagnostics;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using bitmapTest.Properties;

namespace bitmapTest
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        Bitmap myBitmap;
        int cmd = 0;

        private void Form1_Load(object sender, EventArgs e)
        {
            pictureBox1.Image = Resources.bfq0002;
            myBitmap = (Bitmap)pictureBox1.Image;
        }
        /// <summary>
        /// 鼠标取色（移动）
        /// </summary>
        private void pictureBox1_MouseMove(object sender, MouseEventArgs e)
        {
            int mouseX = e.X;
            int mouseY = e.Y;
            txtPoint.Text = "(" + mouseX + "," + mouseY + ")";
            if (rbtmutil.Checked)
            {
                //取色
                try
                {
                    Color pixelColor = myBitmap.GetPixel(mouseX, mouseY);
                    colorbox.BackColor = pixelColor;
                    txtColorValue.Text = System.Drawing.ColorTranslator.ToHtml(pixelColor);
                }
                catch
                { }
            }

            //命令
            switch (cmd)
            {
                case 1:  //画线
                    SolidBrush pixelBrush = new SolidBrush(Color.Red);
                    Graphics g = Graphics.FromImage(myBitmap);
                    g.FillRectangle(pixelBrush, mouseX, mouseY, 2, 2);
                    pictureBox1.Image = myBitmap;
                    break;
                case 2:
                    break;
                default:
                    break;
            }
        }
        /// <summary>
        /// 画笔
        /// </summary>
        private void btnpen1_Click(object sender, EventArgs e)
        {
            if (cmd == 1)
            {
                cmd = 0;
                btnpen1.Image = Resources.png_05252;
                this.toolTip1.SetToolTip(this.btnpen1, "单击使用画笔");
            }
            else
            {
                cmd = 1;
                btnpen1.Image = Resources.png_05253;
                this.toolTip1.SetToolTip(this.btnpen1, "单击禁用画笔");
            }
        }
        /// <summary>
        /// 恢复
        /// </summary>
        private void button1_Click(object sender, EventArgs e)
        {
            pictureBox1.Image = Resources.bfq0002;
            myBitmap = (Bitmap)pictureBox1.Image;
        }
        /// <summary>
        /// 鼠标取色（单击）
        /// </summary>
        private void pictureBox1_MouseDown(object sender, MouseEventArgs e)
        {
            //取色
            try
            {
                Color pixelColor = myBitmap.GetPixel(e.X, e.Y);
                colorbox.BackColor = pixelColor;
                txtColorValue.Text = System.Drawing.ColorTranslator.ToHtml(pixelColor);
            }
            catch
            { }
        }

    }
}

程序界面如下：

演示版下载： Demo         程序源码：Code