Question

我将图像存储到SD卡中。我想将图像分成十六个相等的部分。如何使用位图？

Answer 1

public class CropImageManipulator
{
    public CropImageManipulator()
    {
    }

    private string _fileNameWithoutExtension;
    private string _fileExtension;
    private string _fileDirectory;

    public void Cropping(string inputImgPath, int cropWidth, int cropHeight)
    {
        this._fileNameWithoutExtension = System.IO.Path.GetFileNameWithoutExtension(inputImgPath);
        this._fileExtension = System.IO.Path.GetExtension(inputImgPath);
        this._fileDirectory = System.IO.Path.GetDirectoryName(inputImgPath);

        //Load the image divided
         Image inputImg = Image.FromFile(inputImgPath);
        int imgWidth = inputImg.Width;
        int imgHeight = inputImg.Height;

        //Divide how many small blocks
        int widthCount = (int)Math.Ceiling((imgWidth * 1.00) / (cropWidth * 1.00));
        int heightCount = (int)Math.Ceiling((imgHeight * 1.00) / (cropHeight * 1.00));
        ArrayList areaList = new ArrayList();

        int i = 0;
        for (int iHeight = 0; iHeight < heightCount ; iHeight ++)
        {
            for (int iWidth = 0; iWidth < widthCount ; iWidth ++)
            {
                int pointX = iWidth * cropWidth;
                int pointY = iHeight * cropHeight;
                int areaWidth = ((pointX + cropWidth) > imgWidth) ? (imgWidth - pointX) : cropWidth;
                int areaHeight = ((pointY + cropHeight) > imgHeight) ? (imgHeight - pointY) : cropHeight;
                string s = string.Format("{0};{1};{2};{3}",pointX,pointY,areaWidth,areaHeight);

                Rectangle rect = new Rectangle(pointX,pointY,areaWidth,areaHeight);
                areaList.Add(rect);
                i ++;
            }
        }

        for (int iLoop = 0 ; iLoop < areaList.Count ; iLoop ++)
        {
            Rectangle rect = (Rectangle)areaList[iLoop];
            string fileName = this._fileDirectory + "\\" + this._fileNameWithoutExtension + "_" + iLoop.ToString() + this._fileExtension;
            Bitmap newBmp = new Bitmap(rect.Width,rect.Height,PixelFormat.Format24bppRgb);
            Graphics newBmpGraphics = Graphics.FromImage(newBmp);
            newBmpGraphics.DrawImage(inputImg,new Rectangle(0,0,rect.Width,rect.Height),rect,GraphicsUnit.Pixel);
            newBmpGraphics.Save();
            switch (this._fileExtension.ToLower())
            {
                case ".jpg":
                case ".jpeg":
                    newBmp.Save(fileName,ImageFormat.Jpeg);
                    break;
                case "gif":
                    newBmp.Save(fileName,ImageFormat.Gif);
                    break;
            }
        }
        inputImg.Dispose();
    }
}

Answer 2

尝试这样的事情：

DisplayMetrics dm = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(dm);

final int width = dm.widthPixels;
final int height = dm.heightPixels;

final int pixelByCol = width / 4;
final int pixelByRow = height / 4; 

List<Bitmap> bs = new ArrayList<Bitmap>();

Bitmap image = <your photo here>

for (int i = 0; i < 4) {
    for (int j = 0; j < 4) {
        int startX = pixelByCol * i;
        int startY = pixelByRow * j;
        Bitmap b = Bitmap.createBitmap(image, startX, startY, pixelByCol, pixelByRow);
        bs.add(b);
    }
}

bs＆lt; - 您的位图

Answer 3

我发现下面的代码有效。它将图像分为9个部分。您可以使用此代码将图像分成16个部分。这是一种非常简单的方法。

public Bitmap[] splitBitmap(Bitmap picture)
{
Bitmap scaledBitmap = Bitmap.createScaledBitmap(picture, 240, 240, true);
Bitmap[] imgs = new Bitmap[9];
imgs[0] = Bitmap.createBitmap(scaledBitmap, 0, 0, 80 , 80);
imgs[1] = Bitmap.createBitmap(scaledBitmap, 80, 0, 80, 80);
imgs[2] = Bitmap.createBitmap(scaledBitmap,160, 0, 80,80);
imgs[3] = Bitmap.createBitmap(scaledBitmap, 0, 80, 80, 80);
imgs[4] = Bitmap.createBitmap(scaledBitmap, 80, 80, 80,80);
imgs[5] = Bitmap.createBitmap(scaledBitmap, 160, 80,80,80);
imgs[6] = Bitmap.createBitmap(scaledBitmap, 0, 160, 80,80);
imgs[7] = Bitmap.createBitmap(scaledBitmap, 80, 160,80,80);
imgs[8] = Bitmap.createBitmap(scaledBitmap, 160,160,80,80);
return imgs;


}

该函数将原始位图作为参数，然后使用Bitmap.createScaledBitmap（图片，240,240，true）;我创建了一个尺寸为240 x 240的缩放图像，将图像分割成相等的块，我创建了一个3 x 3的网格，其中每个图像的大小为80 x 80.这可以根据您的需要进行更改，但是宽度应保持在240，因为所有正常的Android手机屏幕都是240宽度。

所有位图都存储在位图数组中，最后该函数将数组返回给调用函数。

将图像分成几部分

3 个答案: