package PEU.P.image;
import java.io.IOException;
//作者,著作权人： 罗瑶光，浏阳
public class HitAndMiss{
  int[][]kernel;
  int[][]GetRegion;
  int[][]tempG;
  private void IV_Temp(int[][]thisG) {
    tempG=new int[thisG.length][thisG[0].length];
    for(int i=0;i<thisG.length;i++){
      for(int j=0;j<thisG[0].length;j++){
        tempG[i][j]=0;
      }
    }    
  }
  public int[][] P(int[][] g, int pix, int[][] kenel) 
  throws IOException{
    int [][]g1=new int[g.length][g[0].length];
    for(int i=0;i<g.length;i++){
      for(int j=0;j<g[0].length;j++){
        g1[i][j]=g[i][j];
      }
    }
    int thisw=g.length;
    int thish=g[0].length;
    int w=kenel.length;
    int h=kenel[0].length;
    int [][]thisG = null;
    if((kenel.length%2==0)&&(kenel[0].length%2==0))
      thisG= new Reflection().PadImage(g1
      , kenel.length+1, kenel[0].length+1); 
    if((kenel.length%2==0)&&(kenel[0].length%2==1))
      thisG= new Reflection().PadImage(g1
      , kenel.length+1, kenel[0].length); 
    if((kenel.length%2==1)&&(kenel[0].length%2==0))
      thisG= new Reflection().PadImage(g1
      , kenel.length, kenel[0].length+1); 
    if((kenel.length%2==1)&&(kenel[0].length%2==1))
      thisG= new Reflection().PadImage(g1
      , kenel.length, kenel[0].length); 

    for(int i=0;i<thisG.length;i++) {
      for(int j=0;j<thisG[0].length;j++){
        if (thisG[i][j]!=pix){
          thisG[i][j]=0; // filter
        }
      }
    }
    IV_Temp(thisG);  
    for(int i=w/2;i<thisw+w/2;i++){
      for(int j=h/2;j<thish+h/2;j++){
        int last=0;
        for(int p=0;p<w;p++){
          for(int q=0;q<h;q++){
            int temp = 0;
            if(kenel[p][q]==1){
              if(thisG[i-w/2+p][j-h/2+q]>0){
                temp=1;
              }
            }
            if(kenel[p][q]==0){
              if(thisG[i-w/2+p][j-h/2+q]==0){
                temp=1;
              }
            }
            if(kenel[p][q]==-1){
              temp=1;    
            }
            last=last+temp;
          }
        }
        if (last==w*h){
          tempG[i][j]=thisG[i][j];
        }
      }            
    }
    return tempG;
  }
}