如何使用填充在C＃中的圖片框內移動圖像？

Question

我正在嘗試通過更改圖片框的填充使用鼠標在圖片框內移動圖片。我能夠移動圖像，但它moves too much。這是我走到這一步：

private bool mouseDown; 
private Point lastLocation; 

private void pictureBox1_MouseDown(object sender, MouseEventArgs e) 
{ 
    if (e.Button == MouseButtons.Left) 
    { 
     mouseDown = true; 
     lastLocation = e.Location; 
    } 
} 

private void pictureBox1_MouseMove(object sender, MouseEventArgs e) 
{ 
    if (mouseDown == true) 
    { 
     int dx = e.X - lastLocation.X; 
     int dy = e.Y - lastLocation.Y; 
     pictureBox1.Padding = new Padding(pictureBox1.Padding.Left + dx, 
            pictureBox1.Padding.Top + dy, 0, 0); 
     pictureBox1.Invalidate(); 
    } 
} 

private void pictureBox1_MouseUp(object sender, MouseEventArgs e) 
{ 
    mouseDown = false; 
} 

Answer 1

的幫助，我找到了一個解決方案：

下的MouseMove，我換成

pictureBox1.Padding = new Padding(pictureBox1.Padding.Left + dx, 
           pictureBox1.Padding.Top + dy, 0, 0); 

與

pictureBox1.Padding = new Padding(Padding.Left + dx, Padding.Top + dy, 0, 0); 

Answer 2

我想這是因爲你添加更多的填充時，參照當前填充每次加更多的填充：

pictureBox1.Padding = new Padding(pictureBox1.Padding.Left + dx, 
           pictureBox1.Padding.Top + dy, 0, 0); 

嘗試，而不是：

pictureBox1.Padding = new Padding(dx, dy, 0, 0);