如何在圖片框中旋轉圖像

Question

我正在製作一個winforms應用程序。我希望實現的功能之一是家庭窗體上的旋轉裝置。

裝入家庭表單時，應將鼠標懸停在設備圖片上，並且應該旋轉到位。

但我到目前爲止所有的RotateFlip，只是翻轉圖片。

當鼠標懸停在其上時，是否有辦法讓齒輪轉動到位？

我到目前爲止的代碼是：

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; 
    } 

就像我說的，我只是想將齒輪。我正在嘗試在Windows窗體應用程序中執行此操作。使用C＃。框架4

Answer 1

您將不得不使用Timer創建Image的旋轉。沒有內置的旋轉方法。

創建一個全球性的計時器：

Timer rotationTimer; 

初始化在窗體的構造定時器，創造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; 

然後創建自己的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

你可以使用這樣的Graphics.RotateTransform方法;我使用一個雙緩衝面板，一個定時器和兩個類變量..

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 
} 

確保圖像是正方形，並在中間的齒輪！這裏是一個很好的一個：

這是一個無閃爍doublebuffered面板：

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