PictureBox 读取图片及绘画[亲测有效]
Hi，大家好，我是编程小6，很荣幸遇见你，我把这些年在开发过程中遇到的问题或想法写出来，今天说一说PictureBox 读取图片及绘画[亲测有效],希望能够帮助你!!!。
![PictureBox 读取图片及绘画[亲测有效]_https://bianchenghao6.com/blog__第1张](./wp-content/uploads/2023/03/2023032613475569-150x93.jpg "PictureBox 读取图片及绘画[亲测有效]__第1张_编程好6博客")
Form1.cs
文件如下：
![PictureBox 读取图片及绘画[亲测有效]_https://bianchenghao6.com/blog__第2张](http://www.cnblogs.com/Images/OutliningIndicators/None.gif "PictureBox 读取图片及绘画[亲测有效]__第2张_编程好6博客")
using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
//
myself
using System.Collections.Specialized;
using System.Text;
using System.Drawing.Imaging;
using System.Runtime.InteropServices;
namespace haopai
![PictureBox 读取图片及绘画[亲测有效]_https://bianchenghao6.com/blog__第16张](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif "PictureBox 读取图片及绘画[亲测有效]__第16张_编程好6博客")
{![PictureBox 读取图片及绘画[亲测有效]_https://bianchenghao6.com/blog__第17张](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif "PictureBox 读取图片及绘画[亲测有效]__第17张_编程好6博客")
///
<summary>
![PictureBox 读取图片及绘画[亲测有效]_https://bianchenghao6.com/blog__第18张](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif "PictureBox 读取图片及绘画[亲测有效]__第18张_编程好6博客")
///
Form1 的摘要说明。
![PictureBox 读取图片及绘画[亲测有效]_https://bianchenghao6.com/blog__第19张](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif "PictureBox 读取图片及绘画[亲测有效]__第19张_编程好6博客")
///
</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 );
}![PictureBox 读取图片及绘画[亲测有效]_https://bianchenghao6.com/blog__第54张](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif "PictureBox 读取图片及绘画[亲测有效]__第54张_编程好6博客")
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));
} } } }![PictureBox 读取图片及绘画[亲测有效]_https://bianchenghao6.com/blog__第307张](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif "PictureBox 读取图片及绘画[亲测有效]__第307张_编程好6博客")
}
本文转自钢钢博客园博客，原文链接：http://www.cnblogs.com/xugang/archive/2007/12/24/1012665.html，如需转载请自行联系原作者
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