在C#中裁剪显示异常 [英] Cropping in c# shows Out of exceptions

问题描述

public class CropHandler
    {
        ImageHandler imageHandler;
        private Bitmap _bitmapPrevCropArea;

        public CropHandler(ImageHandler imageHandler)
        {
            this.imageHandler = imageHandler;
        }

        public void Crop(int xPosition, int yPosition, int width, int height)
        {
            Bitmap temp = (Bitmap)imageHandler.CurrentBitmap;
            Bitmap bmap = (Bitmap)temp.Clone();
            if (xPosition + width > imageHandler.CurrentBitmap.Width)
                width = imageHandler.CurrentBitmap.Width - xPosition;
            if (yPosition + height > imageHandler.CurrentBitmap.Height)
                height = imageHandler.CurrentBitmap.Height - yPosition;
            Rectangle rect = new Rectangle(xPosition, yPosition, width, height);
            imageHandler.CurrentBitmap = (Bitmap)bmap.Clone(rect, bmap.PixelFormat);
        }

        public void DrawOutCropArea(int xPosition, int yPosition, int width, int height)
        {
            imageHandler.RestorePrevious();
            _bitmapPrevCropArea = (Bitmap)imageHandler.CurrentBitmap;
            Bitmap bmap = (Bitmap)_bitmapPrevCropArea.Clone();
            Graphics gr = Graphics.FromImage(bmap);
            Brush cBrush = new Pen(Color.FromArgb(150, Color.White)).Brush;
            Rectangle rect1 = new Rectangle(0, 0, imageHandler.CurrentBitmap.Width, yPosition);
            Rectangle rect2 = new Rectangle(0, yPosition, xPosition, height);
            Rectangle rect3 = new Rectangle(0, (yPosition + height), imageHandler.CurrentBitmap.Width, imageHandler.CurrentBitmap.Height);
            Rectangle rect4 = new Rectangle((xPosition + width), yPosition, (imageHandler.CurrentBitmap.Width - xPosition - width), height);
            gr.FillRectangle(cBrush, rect1);
            gr.FillRectangle(cBrush, rect2);
            gr.FillRectangle(cBrush, rect3);
            gr.FillRectangle(cBrush, rect4);
            imageHandler.CurrentBitmap = (Bitmap)bmap.Clone();
        }

        public void RemoveCropAreaDraw()
        {
            imageHandler.CurrentBitmap = (Bitmap)_bitmapPrevCropArea.Clone();
        }

       public Bitmap cropImage(Rectangle _selection)
        {
            try
            {

                int cropWidth = 0;
                int cropHeight = 0;
                int cropXPosition = 0;
                int cropYPosition = 0;

                cropWidth = objCurrImageHandler.CurrentBitmap.Width;
                cropHeight = objCurrImageHandler.CurrentBitmap.Height;

                cropXPosition = _selection.X;
                cropYPosition = _selection.Y;
                cropWidth = _selection.Width;
                cropHeight = _selection.Height;

                if (cropWidth != 0 && cropHeight != 0)
                {
                    objCurrImageHandler.CurrentCropHandler.DrawOutCropArea(cropXPosition, cropYPosition, cropWidth, cropHeight);

                    if (MessageBox.Show("Do u want to crop this area?", "ImageProcessing", MessageBoxButtons.OKCancel, MessageBoxIcon.Question) == DialogResult.OK)
                    {

                        objCurrImageHandler.CurrentCropHandler.Crop(cropXPosition, cropYPosition, cropWidth, cropHeight);
                        //objOriginalCurrImgHandler.CurrentBitmap = objCurrImageHandler.CurrentBitmap;
                    }
                    else
                    {
                        objCurrImageHandler.CurrentCropHandler.RemoveCropAreaDraw();
                    }
                }
               

            }
            catch (Exception ex)
            {
               // MessageBox.Show("Error occured: " + ex.Message, "Image Processing", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }

            return objCurrImageHandler.CurrentBitmap;
      }

该程序显示内存不足异常".我曾尝试处置一次性物品，但仍然显示出异常.
有人可以优化代码吗?

This program shows "Out of memory exception". I have tried to dispose disposable objects but still it shows the exception.
Could anybody please optimize the code?

推荐答案

这看起来像是一种复杂的裁剪图像的可怕方法，特别是在我找到了示例的情况下.请查看下一页上的部分，其中包含用于裁剪图像的漂亮的简短代码段:
http://www.switchonthecode.com/tutorials/csharp-tutorial-图像编辑节省裁切和调整大小 [ ^ ]

具体来说，这段代码片段:(摘自上面的原始资源)

This looks like a horribly over complex way of cropping an image, especially given the example I have found. Please take a look at the section on the following page that has a nice short and simple snippet of code for cropping images:
http://www.switchonthecode.com/tutorials/csharp-tutorial-image-editing-saving-cropping-and-resizing[^]

Specifically this snippet of code: (taken from original source above)

private static Image cropImage(Image img, Rectangle cropArea)
{
   Bitmap bmpImage = new Bitmap(img);
   Bitmap bmpCrop = bmpImage.Clone(cropArea,
   bmpImage.PixelFormat);
   return (Image)(bmpCrop);
}

希望这会有所帮助，
Ed

Hope this helps,
Ed

这篇关于在C#中裁剪显示异常的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！