#include<stdio.h> #include<windows.h> typedef struct tagPoint{ int x; int y; }Point; typedef struct tagRGB{ BYTE rgbBlue; BYTE rgbGreen; BYTE rgbRed; }RGB; /************************************************************** 功能：在24位位图上通过传入的参数画一个矩形 参数： pfin 要绘制的位图 savePath 保存路径 LUpoint 矩形左上顶点 RDpoint 矩形右下顶点 colour 线框的颜色 作者：airduce 时间：2018-9-27 15:48:27 修改时间：无 修改内容：新建 **************************************************************/ int drawRectangle(FILE * pfin,char * savePath,Point LUpoint,Point RDpoint,RGB colour){ BITMAPFILEHEADER fileHeader; BITMAPINFOHEADER infoHeader; //读取文件头 fread(&fileHeader,sizeof(BITMAPFILEHEADER),1,pfin); //读取信息头 fread(&infoHeader,sizeof(BITMAPINFOHEADER),1,pfin); if(infoHeader.biBitCount==24) { //int size=infoHeader.biWidth*infoHeader.biHeight; //RGBQUAD img[256][256]; //创建动态数组 RGB **img; img = (RGB**)malloc(sizeof(RGB*)*infoHeader.biHeight);//创建一个指针数组，把指针数组的地址赋值给 for (int i = 0; i < infoHeader.biHeight; i++) img[i] = (RGB*)malloc(sizeof(RGB)*infoHeader.biWidth);//给第二维分配空间 //读取位图信息 for(int i = 0; i<infoHeader.biHeight;i++){ fread(img[i],sizeof(RGB)*infoHeader.biWidth,1,pfin); } //fread(img,sizeof(RGBQUAD),size,pfin); //上横线 for(int i=0;i<infoHeader.biWidth;i++){ if((i>LUpoint.x||i==LUpoint.x)&&(i<RDpoint.x||i==RDpoint.x)){ img[RDpoint.y][i].rgbBlue=colour.rgbBlue; img[RDpoint.y][i].rgbGreen=colour.rgbGreen; img[RDpoint.y][i].rgbRed=colour.rgbRed; //img[100][i].rgbReserved=0; } } //下横线 for(int i=0;i<infoHeader.biWidth;i++) { if((i>LUpoint.x||i==LUpoint.x)&&(i<RDpoint.x||i==RDpoint.x)){ img[LUpoint.y][i].rgbBlue=colour.rgbBlue; img[LUpoint.y][i].rgbGreen=colour.rgbGreen; img[LUpoint.y][i].rgbRed=colour.rgbRed; //img[100][i].rgbReserved=0; } } //左横线 for(int i=0;i<infoHeader.biWidth;i++) { if(i>LUpoint.y&&i<RDpoint.y){ img[i][LUpoint.x].rgbBlue=colour.rgbBlue; img[i][LUpoint.x].rgbGreen=colour.rgbGreen; img[i][LUpoint.x].rgbRed=colour.rgbRed; //img[150][i].rgbReserved=0; } } //右横线 for(int i=0;i<infoHeader.biWidth;i++) { if(i>LUpoint.y&&i<RDpoint.y){ img[i][RDpoint.x].rgbBlue=colour.rgbBlue; img[i][RDpoint.x].rgbGreen=colour.rgbGreen; img[i][RDpoint.x].rgbRed=colour.rgbRed; //img[150][i].rgbReserved=0; } } //将修改后的图片保存到文件 FILE * pfout = fopen(savePath,"wb"); fwrite(&fileHeader,sizeof(fileHeader),1,pfout); fwrite(&infoHeader,sizeof(infoHeader),1,pfout); //fwrite(img,sizeof(RGBQUAD),size,pfout); for(int i = 0; i<infoHeader.biHeight;i++){ fwrite(img[i],sizeof(RGB)*infoHeader.biWidth,1,pfout); } //释放空间 for(int i = 0; i<infoHeader.biHeight;i++){ free(img[i]); } free(img); fclose(pfin); fclose(pfout); return 0; } } int main(void){ errno_t err; FILE *pfin; err=fopen_s(&pfin ,"F:\pic940.bmp","rb"); if( err!=0 ) { printf_s("cannot open this file"); return 0; } char * myPath = "F:\haha.bmp"; Point pPoint1,pPoint2; pPoint1.x = 20; pPoint1.y = 20; pPoint2.x = 180; pPoint2.y = 200; //RGBQUAD colour; RGB colour; colour.rgbRed=255; colour.rgbGreen=0; colour.rgbBlue=255; //colour.rgbReserved=0; drawRectangle(pfin,myPath,pPoint1,pPoint2,colour); return 0; }
运行效果：
