PictureBox 读取图片及绘画
Form1.cs 文件如下：
using System;using System.Drawing;using System.Collections;using System.ComponentModel;using System.Windows.Forms;using System.Data;//myselfusing System.Collections.Specialized;using System.Text;using System.Drawing.Imaging;using System.Runtime.InteropServices;namespace haopai
{
/// <summary>
/// Form1 的摘要说明。
/// </summary> public class Form1 : System.Windows.Forms.Form { /// <summary> /// 必需的设计器变量。 /// </summary> private System.ComponentModel.Container components = null; public Form1() { // // Windows 窗体设计器支持所必需的 // InitializeComponent(); // // TODO: 在 InitializeComponent 调用后添加任何构造函数代码 // } /// <summary> /// 清理所有正在使用的资源。 /// </summary> protected override void Dispose( bool disposing ) { if( disposing ) { if (components != null) { components.Dispose(); } } base.Dispose( disposing ); }
Windows 窗体设计器生成的代码 /// <summary> /// 应用程序的主入口点。 /// </summary> [STAThread] static void Main() { Application.Run(new Form1()); } private void Form1_Load(object sender, System.EventArgs e) { // GrayByPixels(); //灰度处理 } private System.Windows.Forms.PictureBox pictureBox1; private System.Windows.Forms.Label r; private System.Windows.Forms.TextBox valueBox; private System.Windows.Forms.Button getbutton; private System.Windows.Forms.TrackBar trackBar1; private System.Windows.Forms.Label label1; private System.Windows.Forms.Label label2; private System.Windows.Forms.TextBox txtStartX; private System.Windows.Forms.TextBox txtStartY; private System.Windows.Forms.TextBox txtEndX; private System.Windows.Forms.TextBox txtEndY; private System.Windows.Forms.Label label5; private System.Windows.Forms.Label label6; private System.Windows.Forms.Label label3; private System.Windows.Forms.Label label4; private System.Windows.Forms.Button btn_SavePoint; //灰度值 protected int nHuidu = 0; public Bitmap bmpobj; private Cursor inCursor; //鼠标样式 private Cursor MyCursor; //鼠标样式 private Point m_ptStart = new Point(0,0); private Point m_ptEnd = new Point(0, 0); private bool m_bMouseDown = false; //读取图片 private void getbutton_Click(object sender, System.EventArgs e) { try { bmpobj=null; //初始化为空 string path = Application.ExecutablePath.Substring(0,Application.ExecutablePath.LastIndexOf("\\"))+ "\\aa.jpg"; Image get_Image = Image.FromFile(path); pictureBox1.Image =get_Image; GrayByPixels(); //灰度处理 //初始化trackBar1 trackBar1.Value = nHuidu; } catch(ArgumentException) { MessageBox.Show("There was an error.Check the path to the image file."); } } //滚动条 private void trackBar1_Scroll(object sender, System.EventArgs e) { int r,g,b; //Bitmap memBmp = new Bitmap(pictureBox1.Image);//(pictureBox1.Width,pictureBox1.Height,System.Drawing.Imaging.PixelFormat.Format24bppRgb); UnCodebase () ; Bitmap memBmp = bmpobj; //Image userDrawAreaImage = Bitmap memBmp int nChang = trackBar1.Value - nHuidu; for(int x=0; x<pictureBox1.Image.Width; x++) { for(int y=0; y<pictureBox1.Image.Height; y++) { Color pixelColor = memBmp.GetPixel(x, y); //byte i = 0x01; if(( (pixelColor.R + nChang) >=0) && ((pixelColor.R + nChang) <= 250)) r = pixelColor.R + nChang; else r = pixelColor.R; if(( (pixelColor.G + nChang) >=0) && ((pixelColor.G + nChang) <= 250)) g = pixelColor.G + nChang; else g = pixelColor.G; if(( (pixelColor.B + nChang) >=0) && ((pixelColor.B + nChang) <= 250)) b = pixelColor.B + nChang; else b = pixelColor.B; //Color newColor = Color.FromArgb(r,g ,b); //memBmp.SetPixel(x, y, newColor); memBmp.SetPixel(x, y, Color.FromArgb(r, g, b)); } } //bmpobj = memBmp; //把图片传给全局变量 // GrayByPixels(); //Graphics memGp = Graphics.FromImage(memBmp); pictureBox1.Image = memBmp; GrayByPixels(); //灰度处理 valueBox.Text = nHuidu.ToString(); } //pictureBox1 按下鼠标 private void pictureBox1_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e) { m_ptStart = new Point(e.X, e.Y); txtStartX.Text = m_ptStart.X.ToString(); txtStartY.Text = m_ptStart.Y.ToString(); //if (!m_bMouseDown) //{ //m_ptEnd = new Point(e.X, e.Y); //txtEndX.Text = m_ptEnd.X.ToString(); //txtEndY.Text = m_ptEnd.Y.ToString(); //} m_bMouseDown = !m_bMouseDown; } //pictureBox1 移动鼠标 private void pictureBox1_MouseMove(object sender, System.Windows.Forms.MouseEventArgs e) { try { if (!m_bMouseDown == true) return; //判断是否按下 pictureBox1_MouseDown m_ptEnd = new Point(e.X, e.Y); this.pictureBox1.Refresh(); if ((e.Button & MouseButtons.Left) == MouseButtons.Left) { //m_ptEnd = new Point(e.X, e.Y); MyCursor = new Cursor("cross_m.cur"); Cursor.Current = MyCursor; //Rectangle rec = new Rectangle(Convert.ToInt32(txtStartX),Convert.ToInt32(txtStartY),Convert.ToInt32(txtEndX),Convert.ToInt32(txtEndY)); //pictureBox1.Image.Size //Bitmap memBmp = bmpobj; //pictureBox1.Image = System.Drawing.Image.FromFile(selection.SubItems[1].Text); } //显示"+"指针 else { inCursor = new Cursor("pen_rm.cur"); Cursor.Current = inCursor; } } catch { if (inCursor != null) inCursor.Dispose(); if (MyCursor != null) MyCursor.Dispose(); } } //鼠标离开 pictureBox1 private void pictureBox1_MouseLeave(object sender, System.EventArgs e) { if (inCursor != null) inCursor.Dispose(); if (MyCursor != null) MyCursor.Dispose(); } //pictureBox1 释放鼠标 private void pictureBox1_MouseUp(object sender, System.Windows.Forms.MouseEventArgs e) { if (!m_bMouseDown == true) return; m_ptEnd = new Point(e.X, e.Y); txtEndX.Text = m_ptEnd.X.ToString(); txtEndY.Text = m_ptEnd.Y.ToString(); m_bMouseDown = !m_bMouseDown; // //Bitmap memBmp = new Bitmap(pictureBox1.Image); //Graphics myGraphics = Graphics.FromImage(pictureBox1.Image); //Pen blackPen = new Pen(Color.Black, 3); //Rectangle rec = new Rectangle(Convert.ToInt32(txtStartX),Convert.ToInt32(txtStartY),Convert.ToInt32(txtEndX),Convert.ToInt32(txtEndY)); //myGraphics.DrawRectangle(blackPen, rec); //pictureBox1.Image = Image.FromStream(myGraphics); //myGraphics.Dispose(); } //pictureBox1 点击图片 private void pictureBox1_Click(object sender, System.EventArgs e) { } //pictureBox1 绘制图片 private void pictureBox1_Paint(object sender, System.Windows.Forms.PaintEventArgs e) { if (m_ptStart.Equals(m_ptEnd)) return; //if(pictureBox1.Image == null || CurX == 0) return; //Pen blackPen = new Pen(Color.Black, 3); e.Graphics.DrawRectangle(System.Drawing.Pens.Yellow,m_ptStart.X,m_ptStart.Y,m_ptEnd.X - m_ptStart.X, m_ptEnd.Y - m_ptStart.Y); //this.pictureBox1.Refresh(); } //保存截取图片点 private void btn_SavePoint_Click(object sender, System.EventArgs e) { } ///////////////////////// xg ////////////////////////////// public void UnCodebase () //(Bitmap pic) { if(bmpobj == null) { //Bitmap memBmp = new Bitmap(pictureBox1.Image);//(pictureBox1.Width,pictureBox1.Height,System.Drawing.Imaging.PixelFormat.Format24bppRgb); bmpobj = new Bitmap (pictureBox1.Image);//(pic); //转换为Format32bppRgb } } /// <summary> /// 根据RGB，计算灰度值 /// </summary> /// <param name="posClr">Color值</param> /// <returns>灰度值，整型</returns> private int GetGrayNumColor(System.Drawing.Color posClr) { return (posClr.R * 19595 + posClr.G * 38469 + posClr.B * 7472)>> 16; } /// <summary> /// 灰度转换,逐点方式 /// </summary> public void GrayByPixels() //灰度处理 { ////// xg ////// int tmpValue = 0; UnCodebase (); Bitmap memBmp = bmpobj; for (int i = 0; i < bmpobj.Height; i++) { for (int j = 0; j < bmpobj.Width; j++) { //int tmpValue = GetGrayNumColor(bmpobj.GetPixel(j, i)); tmpValue += GetGrayNumColor(bmpobj.GetPixel(j, i)); //bmpobj.SetPixel(j, i, Color.FromArgb(tmpValue, tmpValue, tmpValue)); } } tmpValue = tmpValue/(bmpobj.Height * bmpobj.Width); valueBox.Text = tmpValue.ToString(); nHuidu = tmpValue; //全局灰度 } /// <summary> /// 去图形边框 /// </summary> /// <param name="borderWidth"></param> public void ClearPicBorder(int borderWidth) { for (int i = 0; i < bmpobj.Height; i++) { for (int j = 0; j < bmpobj.Width; j++) { if (i < borderWidth || j < borderWidth || j > bmpobj.Width - 1 - borderWidth || i > bmpobj.Height - 1 - borderWidth) bmpobj.SetPixel(j, i, Color.FromArgb(255, 255, 255)); } } } }
}| 作者： XuGang 网名：钢钢 |
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