//缩放图像
private void PicBox_MouseWheel(object sender, MouseEventArgs e)
{
if (m_nScale <= 0.1 && e.Delta <= 0)
{
return; //缩小下线
}
if (m_nScale >= 10 && e.Delta >= 0)
{
return; //放大上线
}
//获取 当前点到画布坐标原点的距离
SizeF szSub = (Size)m_ptCanvas - (Size)e.Location;
//当前的距离差除以缩放比还原到未缩放长度
float tempX = szSub.Width / m_nScale; //这里
float tempY = szSub.Height / m_nScale; //将画布比例
//还原上一次的偏移 //按照当前缩放比还原到
m_ptCanvas.X -= (int)(szSub.Width - tempX); //没有缩放
m_ptCanvas.Y -= (int)(szSub.Height - tempY); //的状态
//重置距离差为 未缩放状态
szSub.Width = tempX;
szSub.Height = tempY;
m_nScale += e.Delta > 0 ? 0.2F : -0.2F;
//重新计算 缩放并 重置画布原点坐标
m_ptCanvas.X += (int)(szSub.Width * m_nScale - szSub.Width);
m_ptCanvas.Y += (int)(szSub.Height * m_nScale - szSub.Height);
PicBox.Invalidate();
}
/// <summary>
/// Make sure that the PicBox have the focus, otherwise it doesn´t receive
/// mousewheel events !.
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void PicBox_MouseEnter(object sender, EventArgs e)
{
if (PicBox.Focused == false)
{
PicBox.Focus();
}
}
private void pictureBox1_MouseMove(object sender, MouseEventArgs e)
{
if (_isMouseDown)
{
_size = new Size(Math.Abs(_point.X - e.Location.X), Math.Abs(_point.Y - e.Location.Y));
PicBox.Invalidate();
}
}
protected override void OnActivated(EventArgs e)//this function is triggered when the user selects the program window
{
base.OnActivated(e);
if (Started) //if the program already started, don't start again
{
return; //this gets out of the function
}
else//if the program hasn't started, do stuff
{
Started = true; //program needs to remember that we started it
}
Canvas = PicBox.CreateGraphics(); //these variables help with displaying stuff to the screen
Scratch = new Bitmap(PicBox.Width, PicBox.Height);
ScratchCanvas = Graphics.FromImage(Scratch);
Font fSmall = new Font("Consolas", 10, GraphicsUnit.Point);//fSmall, fMedium, and fBig are 10, 16, and 30 point fonts.
Font fMedium = new Font("Consolas", 16, GraphicsUnit.Point);
Font fBig = new Font("Consolas", 30, GraphicsUnit.Point);
float Theta = 1f;//some numbers
int Theta2 = -100;
float Radius = 1f;
ScratchCanvas.FillRectangle(Brushes.Black, 0, 0, PicBox.Width, PicBox.Height);//make the background black
while (!userQuits)
{
Random Rand = new Random((int)Theta * 1); //creates a random seed
byte R = (byte)((Rand.Next(0, 9) * 32) - 1); //Rand.Next makes it so the random will only give a number from 0-8 (9 is length)
byte G = (byte)((Rand.Next(0, 9) * 32) - 1);
byte B = (byte)((Rand.Next(0, 9) * 32) - 1);
ScratchCanvas.FillRectangle(Brushes.Black, 0, 0, PicBox.Width, PicBox.Height);
ScratchCanvas.DrawString("Hello World!", fSmall, new SolidBrush(Color.FromArgb(255, R, G, B)), (int)(Radius * Math.Sin(Theta)) + PicBox.Width / 2, (int)(Radius * Math.Cos(Theta)) + PicBox.Height / 2);//This function draws text to a specific location
ScratchCanvas.DrawString("Hello World!", fMedium, new SolidBrush(Color.FromArgb(255, B, R, G)), 2 * Theta2, (int)(10 * Math.Cos(Theta2)) + PicBox.Height / 2);
ScratchCanvas.DrawString("Hello World!", fBig, new SolidBrush(Color.FromArgb(255, B, G, R)), 800 - 15 * Theta2, 5 * Math.Abs((int)(3 * Math.Cos(Theta2))) + PicBox.Height / 4);
/*
* The best strategy for displaying stuff to the screen is to figure out everything you want to draw to the screen and put it into
* a variable; in this case, ScratchCanvas or Scratch (kinda tricky like that).
* Once everything is in Scratch, draw Scratch to the screen.
*/
Canvas.DrawImage(Scratch, 0, 0); //Draw Scratch
Theta2++; //Add stuff to numbers
Theta *= 1.01f;
Radius *= 1.01f;
System.Threading.Thread.Sleep((int)(1000 / 30)); //30 frames per second is a standard for display. Since the sleep function wants
//an integer, and 1000/30 is not, we cast to an int
Application.DoEvents(); //This checks for things like when we close the program
}
}
/// <summary>
/// 鼠标中键按下
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void PicBox_MouseDown(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Middle)
{ //如果中键点下 初始化计算要用的临时数据
m_ptMouseDown = e.Location;
m_ptCanvasBuf = m_ptCanvas;
}
PicBox.Focus();
}
private void ListPath_SelectedIndexChanged(object sender, EventArgs e)
{
if (ListPath.SelectedIndex < 0)
{
return;
}
string path = ListPath.SelectedItem as string;
PicBox.Load(path);
}
private void PicBox_MouseMove(object sender, MouseEventArgs e)
{
if (moveLocation != Point.Empty)
{
PicBox.BringToFront();
Point p = PicBox.Location;
p.X += e.X - moveLocation.X;
p.Y += e.Y - moveLocation.Y;
PicBox.Location = p;
}
}
private void pictureBox1_MouseUp(object sender, MouseEventArgs e)
{
_isMouseDown = false;
_size = new Size(Math.Abs(_point.X - e.Location.X), Math.Abs(_point.Y - e.Location.Y));
PicBox.Invalidate();
var tmpPoint = _point;
var tmpSize = _size;
Crop_Release();
}
private void PicBox_MouseUp(object sender, MouseEventArgs e)
{
var finish = new Point(e.X, e.Y); //для рисования
var g = Graphics.FromImage(bm);
var pen = new Pen(Color.Black, 5f);
g.DrawLine(pen, start, finish);
g.Save();
drawing = false;
g.Dispose();
PicBox.Invalidate();
}
public Form1()
{
InitializeComponent();
// initilize JLusb
jlusb = new JLusb();
// initilize JLvideo
jlvideo = new JLvideo();
// initilize WindowsMediaPlayer
//mWinMediaPlayer = new WindowsMediaPlayer();
//mWinMediaPlayer.openPlayer("E:\\迅雷下载\\J点_bd.mp4");
//PicBox.Load("http://images.china.cn/attachement/jpg/site1000/20150803/c03fd556687217294d854a.jpg");
PicBox.Load("o.jpg");
}
/// <summary>
/// 重置图片
/// </summary>
private void ResetPicture()
{
if (PicBox.Image != null)
{
PicBox.Image.Dispose(); //释放原图像
}
m_ptCanvas = new Point(0, 0); //画布原点在设备上的坐标
m_ptCanvasBuf = new Point(0, 0); //重置画布坐标计算时用的临时变量
m_ptBmp = new Point(0, 0); //图像位于画布坐标系中的坐标
m_ptMouseDown = new Point(0, 0); //鼠标点下是在设备坐标上的坐标
RefreshFormSize();
PicBox.Invalidate();
//资源回收
GC.Collect();
}
private void pictureBox1_MouseMove(object sender, MouseEventArgs e)
{
if (!drawing)
{
return; //тут 3 процедуры на рисование - движение мыши, нажатая кнопка и отжатая
}
var finish = new Point(e.X, e.Y);
bm2 = new Bitmap(bm);
PicBox.Image = bm2;
var pen = new Pen(Color.Black, 5f);
var g = Graphics.FromImage(bm2);
g.DrawLine(pen, start, finish);
g.Dispose();
PicBox.Invalidate();
}
private void Form1_Load(object sender, EventArgs e)
{
OpenFileDialog ofd = new OpenFileDialog();
ofd.CheckFileExists = true;
ofd.Filter = "(*.jpg)|*.jpg|(*.png)|*.png";
ofd.Multiselect = true;
//ofd.InitialDirectory=
if (ofd.ShowDialog() == DialogResult.OK)
{
FileNames = ofd.FileNames;
}
if (FileNames != null && FileNames.Length >= 1)
{
PicBox.Load(FileNames[0]);
ListPath.Items.AddRange(FileNames);
}
}
/// <summary>
/// 依据控件图像大小，计算缩放比例，使图像铺满绘图框
/// </summary>
public void RefreshFormSize()
{
if (m_bmp != null)
{
if ((Width < m_bmp.Width) || (Height < m_bmp.Height))
{
m_nScale = ((float)Width / m_bmp.Width) > ((float)Height / m_bmp.Height) ? ((float)Height / m_bmp.Height) : ((float)Width / m_bmp.Width);
//this.Width = (int)(m_bmp.Width * m_nScale);
//this.Height = (int)(m_bmp.Height * m_nScale);
}
else
{
m_nScale = ((float)m_bmp.Width / Width) > ((float)m_bmp.Height / Height) ? ((float)m_bmp.Height / Height) : ((float)m_bmp.Width / Width);
//this.Width = (int)(Width * m_nScale);
//this.Height = (int)(Height * m_nScale);
}
}
PicBox.Invalidate();
}
/// <summary>
/// 平移图像
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void PicBox_MouseMove(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Middle)
{ //移动过程中 中键点下 重置画布坐标系
//我总感觉这样写不妥 但却是方便计算 如果多次这样搞的话 还是重载操作符吧
m_ptCanvas = (Point)((Size)m_ptCanvasBuf + ((Size)e.Location - (Size)m_ptMouseDown));
PicBox.Invalidate();
}
//计算 右上角显示的坐标信息
SizeF szSub = (Size)e.Location - (Size)m_ptCanvas; //计算鼠标当前点对应画布中的坐标
szSub.Width /= m_nScale;
szSub.Height /= m_nScale;
Size sz = TextRenderer.MeasureText(m_strMousePt, this.Font); //获取上一次的区域并重绘
PicBox.Invalidate(new Rectangle(PicBox.Width - sz.Width, 0, sz.Width, sz.Height));
m_strMousePt = e.Location.ToString() + "\n" + ((Point)(szSub.ToSize())).ToString();
sz = TextRenderer.MeasureText(m_strMousePt, this.Font); //绘制新的区域
PicBox.Invalidate(new Rectangle(PicBox.Width - sz.Width, 0, sz.Width, sz.Height));
}
/// <summary>
/// 指定位置缩放，查看图片细节
/// </summary>
/// <param name="originPos"></param>
/// <param name="ratio"></param>
public void FocusPic(Point originPos, float ratio)
{
m_ptCanvas = originPos; //聚焦坐标
m_nScale = ratio; //缩放系数
PicBox.Invalidate(); //重绘
}
