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使用鼠标事件在PictureBox中移动图像

picturebox image c#

TerribleDog · 技术社区 · 7 年前

我有这个代码,在这里我上传/放置图片到图片框中。我现在要做的是使用鼠标事件将它拖到图片框中。当我的图像是用另一个类绘制的时候,我该怎么做?

图像类

public void ImageDrawing(Bitmap bm, RectangleF rect, PaintEventArgs e)
    {
        this.image = bm;
        this.width = rect.Width;
        this.height = rect.Height;
        this.rect = rect;
        Graphics g = e.Graphics;
        bm = ImageClass.GrayscaleImage(bm);
        bm.MakeTransparent(Color.White);
        g.DrawImage(bm, rect);
    }

主要形式

private void btn_Browse_Click(object sender, EventArgs e)
    {
        PaintImage();
    }
    public void PaintImage()
    {
        buttons = (Shape.ShapeType)System.Enum.Parse(typeof(Shape.ShapeType), "image");
        // open file dialog   
        OpenFileDialog open = new OpenFileDialog();
        // image filters  
        open.Filter = "Image Files(*.jpg; *.jpeg; *.gif; *.bmp); *.PNG|*.jpg; *.jpeg; *.gif; *.bmp; *.PNG";
        if (open.ShowDialog() == DialogResult.OK)
        {
            //Display image in picture box  
            string strType = Path.GetExtension(open.FileName);
            FileInfo fs = new FileInfo(open.FileName);
            long fileSize = fs.Length / 1024;
            ImageBitmap = new Bitmap(open.FileName);
        }
        imageHeight = ImageBitmap.Height / 3f;
        imageWidth = ImageBitmap.Width / 3f;
        imageX = (shape.center.X - (imageWidth / 2));
        imageY = (shape.center.Y - (imageHeight / 2));
        imageRect = new RectangleF(imageX, imageY, imageWidth, imageHeight);
        pictureBox_Canvass.Refresh();
    }

1 回复 | 直到 7 年前

TaW 7 年前

使用 mousemove event和 mousebutton check确定目标矩形的顶部/左侧。(或者中心?)


   
    
     
      然后通过调用
      
       pbox.invalidate()触发
       
        paint
        
         event!
        
       
      
     
     
      
       
        
         示例:
        
        
         
          
         
        
        imageClass animage=null;

private void pb_canvas_paint(对象发送器、paintEventargs e)
{
动画。图像绘制(animage.image,animage.rectangle,e);
}

private void pb_canvas_mousemove(对象发送器,mouseEventargs e)
{
if(e.button.hasFlag(mouseButtons.left))。
{
animage.rectangle=新矩形(e.x,e.y,animage.image.width,animage.image.height);
pb_canvas.invalidate();
}
}
< /代码> 


然后触发Paint通过调用的事件pBox.Invalidate()!

例子:



ImageClass anImage = null;

private void pb_canvas_Paint(object sender, PaintEventArgs e)
{
    anImage.ImageDrawing(anImage.image, anImage.rectangle, e);
}

private void pb_canvas_MouseMove(object sender, MouseEventArgs e)
{
    if (e.Button.HasFlag(MouseButtons.Left))
    {
        anImage.rectangle = new Rectangle(e.X, e.Y, anImage.image.Width, anImage.image.Height );
        pb_canvas.Invalidate();
    }
}