博客

#include <fstream> 
#include <math.h>
#include <stdio.h>
#include <windows.h>
#include <iostream>
using namespace std;

int main()
{
	//定义原始图像的宽和高 
	unsigned int Height = 0;
	unsigned int Width = 0;
	//定义循环变量 
	int i=0;
	int j=0;
	//定义pi
	double pi=3.1415926; 
	
	BITMAPFILEHEADER bmpfileheader; //文件头
	BITMAPINFOHEADER bmpinfoheader; //信息头
	//24位像素点RGB结构体
	typedef struct tagRGB 
	{
		BYTE blue;
		BYTE green;
		BYTE red;
	}RGBDATA; 
	
	FILE *fpin; //读取操作流
	FILE *fpout; //读出操作流
	
	fpin=fopen("picture.bmp","rb");
	fread(&bmpfileheader,sizeof(BITMAPFILEHEADER),1,fpin);//读取文件头
	fread(&bmpinfoheader,sizeof(BITMAPINFOHEADER),1,fpin);//读取信息头
	Height=bmpinfoheader.biHeight;
	Width=bmpinfoheader.biWidth;
	
	//动态创建二维数组
	RGBDATA** RGBin; 
	RGBin = (RGBDATA **)malloc(sizeof(RGBDATA*) * Height);
	for (i = 0; i < Height; i++) 
	{
		RGBin[i] = (RGBDATA *)malloc(sizeof(RGBDATA) * Width);
	}
	
	//读入像素信息
	for(i=0;i<Height;i++)
	{
		fread(RGBin[i], sizeof(tagRGB), Width, fpin);
	}
	
	//动态创建二维数组
	RGBDATA** RGBout; 
	RGBout = (RGBDATA **)malloc(sizeof(RGBDATA*) * Height);
	for (i = 0; i < Height; i++) 
	{
		RGBout[i] = (RGBDATA *)malloc(sizeof(RGBDATA) * Width);
	}
	
	//将输出图像的底色变为灰色
	for(i=0;i<Width;i++)
	{
		for(j=0;j<Height;j++)
		{
			RGBout[j][i].blue=127;
			RGBout[j][i].green=127;
			RGBout[j][i].red=127;
		}
	} 
	
	cout<<"请输入所要旋转的角度:";
	double degree;
	cin>>degree;
	
	//将角度换算成弧度
	degree = (degree/180) * pi ;
	cout<<"degree ="<<degree<<endl;
	cout<<"cos(degree)="<<cos(degree)<<endl;
	cout<<"sin(degree)="<<sin(degree)<<endl;
	
	//定义旋转中心点 
	int X0=(Width-1)/2;
	int Y0=(Height-1)/2; 
	
	//定义旋转后的点的坐标 
	int X=0;
	int Y=0;
	
	//定义当前点到 旋转中心点的差值
	int _X=0;
	int _Y=0;
	 
	int src_i,src_j,dst_i,dst_j; 
	//将原始图像旋转 ---双线性插值的旋转处理
	for(i=0;i<Height;i++)
	{
		for(j=0;j<Width;j++)
		{
			src_i=i-Y0;
			src_j=j-X0;
			dst_i=(int)(cos(degree)*src_j+sin(degree)*src_i)+Y0;
			dst_j=(int)(cos(degree)*src_i-sin(degree)*src_j)+X0;
            if(dst_i>=0&&dst_i<Height&&dst_j>=0&&dst_j<Width)
            {
    	        RGBout[j][i].blue=RGBin[dst_i][dst_j].blue;
    	        RGBout[j][i].green=RGBin[dst_i][dst_j].green;
            	RGBout[j][i].red=RGBin[dst_i][dst_j].red;
        	}
			
		}
	}
	
	//将信息写入文件
	fpout=fopen("picture_out.bmp","wb");
	fwrite(&bmpfileheader,sizeof(BITMAPFILEHEADER),1,fpout);
	fwrite(&bmpinfoheader,sizeof(BITMAPINFOHEADER),1,fpout);
	for (i=0;i<Height;i++)
	{
		fwrite(RGBout[i],sizeof(tagRGB),Width,fpout);
	}
 	printf("生成新图片成功!\n");
	fclose(fpin);
	fclose(fpout);
	return 0;
}