myclass.cpp

把一个图象转 换为灰度图换为灰度图

#include "stdafx.h"
#include "MyClass.h"
#include "math.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif


//====================================================================

//====================================================================

//________________Classe Image______________________

Image::Image(int width0, int height0)
{
	int i,j;
	width=width0;
	height=height0;

	ng=(int **)calloc(width,sizeof(int *));
	for (i=0;i<width;i++)	  
		ng[i]=(int *)calloc(height,sizeof(int));

	for (j=0;j<height;j++)
	{
		for (i=0; i<width;i++)
		{
			ng[i][j]=0;
		}
	}
}
//___________________________________________________________________
Image::~Image()
{
	int i;
	for (i=0; i<width; i++)
	{
		free(ng[i]);
	}
	free(ng);
}
//____________________________________________________________________
void Image::Write(char* filename)
{
	FILE *fp;
	fp=fopen(filename,"w+");
	fprintf(fp,"P2\n%d %d\n%d\n",width,height,255);
	for (int j=0;j<height;j++)
	{
		for (int i=0; i<width;i++)
		{
			fprintf(fp,"%d ",ng[i][j]);
		}
		fprintf(fp,"\n");
	}
	fclose(fp);
}
//____________________________________________________________________
void Image::copy(Image* im)
{
	int i, j;
	height=im->height;
	width=im->width;
	for (j=0;j<height;j++)
		for (i=0;i<width;i++)
			ng[i][j]=im->ng[i][j];
}
//____________________________________________________________________
Image::Image(char* filename)
{
	FILE *fp;
	char s[5];
	int  i,j;

	fp=fopen(filename, "r+");
	fscanf(fp,"%s %d %d %d", s,&width,&height,&i);

	ng=(int**) malloc (width*sizeof(int*));

	for(i=0;i<width;i++)
	{
		ng[i]=(int*) malloc (height*sizeof(int));
	}

	for(j=0;j<height;j++)
	{
		for(i=0;i<width;i++)
		{
			fscanf(fp, "%d",&ng[i][j]);
		}
	}
	fclose(fp);
}
//_______________________________________________________
void Image::Afficher(CDC* dc, int x, int y)
{
	int i,j;

	for(i=0;i<height;i++)
		for(j=0;j<width;j++)
			dc->SetPixel(j+x,i+y,RGB(ng[j][i],ng[j][i],ng[j][i]));
}