将图像分为几部分

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。 如何使用位图来做到这一点？

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

给它一个尝试财产以后这样的：

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 < - 你的位图

Answer 3

我发现下面的代码工作的greates。它将图像分成9个部分。您可以使用此代码将图像分成16个部分。这是一个非常简单的方法。

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; 


} 

该函数采用原始位图作为参数，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，以将图像分成相等的部分，我创建了一个3 x 3的网格，其中每个图像的尺寸为80 x 80.这可以根据您的需要进行更改，但是宽度应该保持为240，因为所有正常的Android手机屏幕都是240宽的。

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。