如何在图片框中旋转图像

Question

我正在制作一个winforms应用程序。我希望实现的功能之一是家庭窗体上的旋转装置。

装入家庭表单时，应将鼠标悬停在设备图片上，并且应该旋转到位。

但我到目前为止所有的RotateFlip，只是翻转图片。

当鼠标悬停在其上时，是否有办法让齿轮转动到位？

我到目前为止的代码是：

Bitmap bitmap1; 
    public frmHome() 
    { 
     InitializeComponent(); 
     try 
     { 
      bitmap1 = (Bitmap)Bitmap.FromFile(@"gear.jpg"); 
      gear1.SizeMode = PictureBoxSizeMode.AutoSize; 
      gear1.Image = bitmap1; 
     } 
     catch (System.IO.FileNotFoundException) 
     { 
      MessageBox.Show("There was an error." + 
       "Check the path to the bitmap."); 
     } 
    } 

    private void frmHome_Load(object sender, EventArgs e) 
    { 
     System.Threading.Thread.Sleep(5000); 
    } 

    private void frmHome_FormClosed(object sender, FormClosedEventArgs e) 
    { 
     Application.Exit(); 
    } 

    private void pictureBox1_MouseHover(object sender, EventArgs e) 
    { 

     bitmap1.RotateFlip(RotateFlipType.Rotate180FlipY); 
     gear1.Image = bitmap1; 
    } 

就像我说的，我只是想将齿轮。我正在尝试在Windows窗体应用程序中执行此操作。使用C＃。框架4

Answer 1

您将不得不使用Timer创建Image的旋转。没有内置的旋转方法。

创建一个全球性的计时器：

Timer rotationTimer; 

初始化在窗体的构造定时器，创造PictureBoxMouseEnter和MouseLeave事件：

//initializing timer 
rotationTimer = new Timer(); 
rotationTimer.Interval = 150; //you can change it to handle smoothness 
rotationTimer.Tick += rotationTimer_Tick; 

//create pictutrebox events 
pictureBox1.MouseEnter += pictureBox1_MouseEnter; 
pictureBox1.MouseLeave += pictureBox1_MouseLeave; 

然后创建自己的Event Handlers：

void rotationTimer_Tick(object sender, EventArgs e) 
{ 
    Image flipImage = pictureBox1.Image; 
    flipImage.RotateFlip(RotateFlipType.Rotate90FlipXY); 
    pictureBox1.Image = flipImage; 
} 

private void pictureBox1_MouseEnter(object sender, EventArgs e) 
{ 
    rotationTimer.Start(); 
} 

private void pictureBox1_MouseLeave(object sender, EventArgs e) 
{ 
    rotationTimer.Stop(); 
} 

Answer 2

你可以使用这样的Graphics.RotateTransform方法;我使用一个双缓冲面板，一个定时器和两个类变量..

Bitmap bmp; 
float angle = 0f; 

private void Form1_Load(object sender, EventArgs e) 
{ 
    bmp = new Bitmap(yourGrarImage); 
    int dpi = 96; 
    using (Graphics G = this.CreateGraphics()) dpi = (int)G.DpiX; 
    bmp.SetResolution(dpi, dpi); 
    panel1.ClientSize = bmp.Size; 
} 

private void timer1_Tick(object sender, EventArgs e) 
{ 

    angle+=2;    // set the speed here.. 
    angle = angle % 360; 
    panel2.Invalidate(); 
} 


private void panel1_Paint(object sender, PaintEventArgs e) 
{ 
    if (bmp!= null) 
    { 
      float bw2 = bmp.Width/2f; // really ought.. 
      float bh2 = bmp.Height/2f; // to be equal!!! 
      e.Graphics.TranslateTransform(bw2, bh2); 
      e.Graphics.RotateTransform(angle); 
      e.Graphics.TranslateTransform(-bw2, -bh2); 
      e.Graphics.DrawImage(bmp, 0, 0); 
      e.Graphics.ResetTransform(); 
    } 
} 

private void panel1_MouseLeave(object sender, EventArgs e) 
{ 
    timer1.Stop(); 
} 

private void panel1_MouseHover(object sender, EventArgs e) 
{ 
    timer1.Start(); 
    timer1.Interval = 10; // ..and/or here 
} 

确保图像是正方形，并在中间的齿轮！这里是一个很好的一个：

这是一个无闪烁doublebuffered面板：

public class Display : Panel 
{ 
    public Display() 
    { 
     this.DoubleBuffered = true; 
    } 
}