参考CSND论坛
一，点击图片上任意位置，此位置移动至图框（picturebox）中心.
需要三个坐标：1，图片中心坐标（根据图片尺寸计算）；2，图框中心坐标（常量，已确定）；3点击坐标（图框坐标系）
方法：根据1与2的位置差，先将图片中心与图框中心重合，然后使用全局变量叠加存储每次的3与2的偏差值（叠加存储作用是让图片在上一次偏移的基础上，进行补偿），最后将最新偏差值赋予图片做位置补偿，然后存储最新偏差值。
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace WFA3
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private Bitmap bit1;//上提示图片（图片1）
public Bitmap bitBig;//放大后图片
bool mark=false;
//点击位置坐标
Point MD;
//存储点击位置坐标
Point md;
//picbox中心坐标
Point PbCenter;
//图片中心坐标
Point PicCenter;
Point PicCenterB;
//图片偏移量缓存（存储上一次图片偏移量）
int Sx;
int Sy;
//pb中心与pic中心位置差
Size CenDist;
//大图片时pb中心与pic中心位置差
Size CenDistBig;
private void button1_Click(object sender, EventArgs e)
{
if (this.openFileDialog1.ShowDialog() == DialogResult.OK)
{
string path = this.openFileDialog1.FileName;//获得图片路径
bit1 = new Bitmap(path);
this.pictureBox1.Image = bit1;
//图片中心坐标，据pb中心距离114，200
PicCenter = new Point((bit1.Width / 2), (bit1.Height / 2));
//pb中心与pic中心位置差
Size CenDis = (Size)PicCenter - (Size)PbCenter;
label1.Text = Convert.ToString(CenDis.Width);
label2.Text = Convert.ToString(CenDis.Height);
CenDist = CenDis;
}
}
private void pictureBox1_Click(object sender, EventArgs e)
{
if(mark==false)
{
if (true)
{
}
mark = true;
}
else
{
}
}
private void Form1_Load(object sender, EventArgs e)
{
label9.Text = "PbCenter";
label10.Text = "PicCenter";
label11.Text = "CenDis";
label12.Text = "Mouse Click Postion";
//图框中心坐标
PbCenter = new Point(pictureBox1.Width / 2, pictureBox1.Height / 2);
label1.Text = Convert.ToString(PbCenter.X);
label2.Text = Convert.ToString(PbCenter.Y);
}
//小图绘图
private void button2_Click(object sender, EventArgs e)
{
int sx = MD.X - PbCenter.X;
int sy = MD.Y - PbCenter.Y;
label5.Text = Convert.ToString(sx);
label6.Text = Convert.ToString(sy);
Bitmap bit = new Bitmap(500, 500);
Graphics g = Graphics.FromImage(bit);
//g.DrawImage(bit1,114-Sx-sx, 200-Sy-sy, bit1.Width,bit1.Height);
g.DrawImage(bit1, -CenDist.Width- Sx - sx,-CenDist.Height - Sy - sy, bit1.Width, bit1.Height);//图片偏移量计算，图中心与图框中心偏移量+之前点击偏移累加量+最新一次点击偏移量，三者之和做补偿（所以全部为负）
DrawNumber(pictureBox1, g);
this.pictureBox1.Image = bit;
Sx += sx;
Sy += sy;
}
private void pictureBox1_MouseClick(object sender, MouseEventArgs e)
{
label7.Text = Convert.ToString(e.X);
label8.Text = Convert.ToString(e.Y);
MD.X = e.X;
MD.Y = e.Y;
}
//绘制图框中心标记，调用绘图方法
public static void DrawNumber(PictureBox pictureBox, Graphics g)
{
//DrawString(g, "点击左边的字", 115, 300);
//DrawString(g, "请点击图中最大的正方体", 10, 410);
DrawPoint(g,249,249,3,3);
}
//绘图方法函数
private static void DrawPoint(Graphics g, int x,int y,int width,int height)
{
//g.DrawString(s, new System.Drawing.Font("????", 10, FontStyle.Bold), new System.Drawing.SolidBrush(System.Drawing.Color.Red), x, y);
g.DrawRectangle(new Pen(Color.Red),x,y,width,height);
}
//图片缩放函数，未完成
private static Bitmap ZoomP(Bitmap a, float s, float v,int x,int y)
{
Bitmap bmp = new Bitmap((int)(a.Width * s), (int)(a.Height * v), System.Drawing.Imaging.PixelFormat.Format24bppRgb);
Graphics g = Graphics.FromImage(bmp);
g.Clear(Color.White);
g.ScaleTransform(s, v);
g.DrawImage(a, x, y, a.Width, a.Height);
a = bmp;
return a;
}
//图片放大，未完成
private void button3_Click(object sender, EventArgs e)
{
Bitmap bitB = new Bitmap(500,500);
bitB = ZoomP(bit1, 2, 2,Sx,Sy);
this.pictureBox1.Image = bitB;
bitBig = bitB;
//大图中心点位置
//PicCenter = new Point((bitB.Width / 2), (bitB.Height / 2));
//label3.Text = Convert.ToString(PicCenter.X);
//label4.Text = Convert.ToString(PicCenter.Y);
////图片中心变成了272，100
////距离pb中心为-22，150
////大图片时,pb与picbig的中心差值
//PicCenterB = new Point((bitBig.Width / 2), (bitBig.Height / 2));
//Size CenDisB = (Size)PicCenterB - (Size)PbCenter;
//CenDistBig = CenDisB;
//label5.Text = Convert.ToString(CenDistBig.Width);
//label6.Text = Convert.ToString(CenDistBig.Height);
}
//大图绘图，未完成
private void button4_Click(object sender, EventArgs e)
{
int sx = MD.X - PbCenter.X;
int sy = MD.Y - PbCenter.Y;
label5.Text = Convert.ToString(sx);
label6.Text = Convert.ToString(sy);
Bitmap bit = new Bitmap(500, 500);
Graphics g = Graphics.FromImage(bit);
//g.DrawImage(bit1,114-Sx-sx, 200-Sy-sy, bit1.Width,bit1.Height);
g.DrawImage(bitBig, -CenDistBig.Width - Sx - sx, -CenDistBig.Height - Sy - sy, bitBig.Width, bitBig.Height);
DrawNumber(pictureBox1, g);
this.pictureBox1.Image = bit;
Sx += sx;
Sy += sy;
}
}
}
