本文整理汇总了C++中BMPClass::pixel方法的典型用法代码示例。如果您正苦于以下问题：C++ BMPClass::pixel方法的具体用法？C++ BMPClass::pixel怎么用？C++ BMPClass::pixel使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类BMPClass的用法示例。
在下文中一共展示了BMPClass::pixel方法的5个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。
示例1: image_print3
void image_print3(){
int r,c;
for(r=0;r<pic3.width;r++)
{
for(c=0;c<pic3.height;c++)
{
glBegin(GL_POINTS);
float rr=(float)(pic3.pixel(r,c,0));
float gg=(float)(pic3.pixel(r,c,1));
float bb=(float)(pic3.pixel(r,c,2));
glColor3f(rr/255,gg/255.0,bb/255.0);
glVertex2d(r,c);
glEnd();
}
}
glTranslatef(0,-250,0);
for(r=0;r<pic3.width;r++)
{
for(c=0;c<pic3.height;c++)
{
glBegin(GL_POINTS);
double magn=(F_real2[r][c]*F_real2[r][c]);
magn+=(F_img2[r][c]*F_img2[r][c]);
magn=sqrt(magn);
float rr=(float)magn;
rr/=255.0;
glColor3f(rr,rr,rr);
glVertex2d(r,c);
glEnd();
}
}
glTranslatef(0,250,0);
}示例2: fourier_transform4
void fourier_transform4(){
int i,j,n,m,k,l;
// take input . . . f(i,j)
n=pic4.height;
m=pic4.width;
for(i=0;i<pic4.height;i++)
{
for(j=0;j<pic4.width;j++)
{
float rr=(float)(pic4.pixel(i,j,0));
f_real[i][j]=rr;
f_img[i][j]=0;
if((i+j)%2){
f_real[i][j]=-rr;
f_img[i][j]=-0;
}
}
}
// calculating . . . P(i,j);
for(j=0;j<m;j++){
int k;
for (k = 0; k < n; k++) { /* For each output element */
double sumreal = 0;
double sumimag = 0;
int t;
for (t = 0; t < n; t++) { /* For each input element */
double angle = 2 * M_PI * t * k / (double)n;
sumreal += f_real[t][j] * cos(angle) + f_img[t][j] * sin(angle);
sumimag += -f_real[t][j] * sin(angle) + f_img[t][j] * cos(angle);
}
P_real[k][j] = sumreal;
P_img[k][j] = sumimag;
}
}
// taking Input . . . F(i,j);
for(i=0;i<n;i++){
int k;
for (k = 0; k < m; k++) { /* For each output element */
double sumreal = 0;
double sumimag = 0;
int t;
for (t = 0; t < m; t++) { /* For each input element */
double angle = 2 * M_PI * t * k / (double)n;
sumreal += P_real[i][t] * cos(angle) + P_img[i][t] * sin(angle);
sumimag += -P_real[i][t] * sin(angle) + P_img[i][t] * cos(angle);
}
F_real3[i][k] = sumreal/(double)m;
F_img3[i][k] = sumimag/(double)m;
}
}
puts("FINISH");
return ;
}示例3: BMPLoad
BMPError BMPLoad(std::string fname,BMPClass& bmp)
{
FILE * f=fopen(fname.c_str(),"rb"); //open for reading in binary mode
if(!f) return BMPNOOPEN;
char header[54];
fread(header,54,1,f); //read the 54bit main header
if(header[0]!='B' || header[1]!='M')
{
fclose(f);
return BMPNOTABITMAP; //all bitmaps should start "BM"
}
if(sizeof(int)==4) //Annoyingly I can't just assume this
{
bmp.width=*(int*)(header+18);
bmp.height=*(int*)(header+22);
}
else
{
bmp.width=header[18]+256*header[19]+256*256*header[20]+256*256*256*header[21];
bmp.height=header[22]+256*header[23]+256*256*header[24]+256*256*256*header[25];
}
bmp.allocateMem();
int bits=int(header[28]); //colourdepth
int x,y,c;
BYTE cols[256*4];
switch(bits)
{
case(24):
fread(bmp.bytes,bmp.width*bmp.height*3,1,f); //24bit is easy
for(x=0;x<bmp.width*bmp.height*3;x+=3) //except the format is BGR, grr
{
BYTE temp=bmp.bytes[x];
bmp.bytes[x]=bmp.bytes[x+2];
bmp.bytes[x+2]=temp;
}
break;
case(8):
fread(cols,256*4,1,f); //read colortable
for(y=0;y<bmp.height;++y) //(Notice 4bytes/col for some reason)
for(x=0;x<bmp.width;++x)
{
BYTE byte;
fread(&byte,1,1,f); //just read byte
for(int c=0;c<3;++c)
bmp.pixel(x,y,c)=cols[byte*4+2-c]; //and look up in the table
}
break;
case(4):
fread(cols,16*4,1,f);
for(y=0;y<256;++y)
for(x=0;x<256;x+=2)
{
BYTE byte;
fread(&byte,1,1,f); //as above, but need to exract two
for(c=0;c<3;++c) //pixels from each byte
bmp.pixel(x,y,c)=cols[byte/16*4+2-c];
for(c=0;c<3;++c)
bmp.pixel(x+1,y,c)=cols[byte%16*4+2-c];
}
break;
//NOT CURRENTLY WORKING PROPERLY
//case(1):
// fread(cols,8,1,f); //colourtable
// for(y=0;y<256;++y)
// for(x=0;x<256;x+=8)
// {
// BYTE byte;
// fread(&byte,1,1,f);
// //The idea here is that every byte is eight pixels
// //so I'm shifting the byte to the relevant position, then masking out
// //all but the lowest bit in order to get the index into the colourtable.
// for(int x2=0;x2<8;++x2)
// {
// for(int c=0;c<3;++c)
// bmp.pixel(x+x2,y,c)=cols[((byte>>(7-x2))&1)*4+2-c];
// }
// }
// break;
default:
fclose(f);
return BMPUNKNOWNFORMAT;
}
fclose(f);
if(ferror(f)) return BMPFILEERROR;
return BMPNOERROR;
}示例4: BMPLoad
BMPError BMPLoad(std::string fname,BMPClass& bmp)
{
if(sizeof(int)!=4) return BMPBADINT;
FILE* f=fopen(fname.c_str(),"rb"); //open for reading in binary mode
if(!f) return BMPNOOPEN;
char header[54];
fread(header,54,1,f); //read the 54bit main header
if(header[0]!='B' || header[1]!='M')
{
fclose(f);
return BMPNOTABITMAP; //all bitmaps should start "BM"
}
//it seems gimp sometimes makes its headers small, so we have to do this. hence all the fseeks
int offset=*(unsigned int*)(header+10);
bmp.width=*(int*)(header+18);
bmp.height=*(int*)(header+22);
//now the bitmap knows how big it is it can allocate its memory
bmp.allocateMem();
int bits=int(header[28]); //colourdepth
int x,y,c;
BYTE cols[256*4]; //colourtable
switch(bits)
{
case(24):
fseek(f,offset,SEEK_SET);
fread(bmp.bytes,bmp.width*bmp.height*3,1,f); //24bit is easy
for(x=0;x<bmp.width*bmp.height*3;x+=3) //except the format is BGR, grr
{
BYTE temp=bmp.bytes[x];
bmp.bytes[x]=bmp.bytes[x+2];
bmp.bytes[x+2]=temp;
}
break;
case(8):
fread(cols,256*4,1,f); //read colortable
fseek(f,offset,SEEK_SET);
for(y=0;y<bmp.height;++y) //(Notice 4bytes/col for some reason)
for(x=0;x<bmp.width;++x)
{
BYTE byte;
fread(&byte,1,1,f); //just read byte
for(int c=0;c<3;++c)
bmp.pixel(x,y,c)=cols[byte*4+2-c]; //and look up in the table
}
break;
case(4):
fread(cols,16*4,1,f);
fseek(f,offset,SEEK_SET);
for(y=0;y<256;++y)
for(x=0;x<256;x+=2)
{
BYTE byte;
fread(&byte,1,1,f); //as above, but need to exract two
for(c=0;c<3;++c) //pixels from each byte
bmp.pixel(x,y,c)=cols[byte/16*4+2-c];
for(c=0;c<3;++c)
bmp.pixel(x+1,y,c)=cols[byte%16*4+2-c];
}
break;
case(1):
fread(cols,8,1,f);
fseek(f,offset,SEEK_SET);
for(y=0;y<bmp.height;++y)
for(x=0;x<bmp.width;x+=8)
{
BYTE byte;
fread(&byte,1,1,f);
//Every byte is eight pixels
//so I'm shifting the byte to the relevant position, then masking out
//all but the lowest bit in order to get the index into the colourtable.
for(int x2=0;x2<8;++x2)
for(int c=0;c<3;++c)
bmp.pixel(x+x2,y,c)=cols[((byte>>(7-x2))&1)*4+2-c];
}
break;
default:
fclose(f);
return BMPUNKNOWNFORMAT;
}
if(ferror(f))
{
fclose(f);
return BMPFILEERROR;
}
fclose(f);
return BMPNOERROR;
}示例5: mainmenu
void mainmenu(){ /// have to change the color (sajid)
//puts("MainMenu");
glBegin( GL_POINTS );
glColor3f(1,0,0);
for(int i=0;i<=100;i++){
for(int j=0;j<=100;j++){
glVertex2d( i,j);
}
}
glEnd();
glColor3f(0,0,0);
glPushMatrix();
glLoadIdentity();
glTranslatef(20,100,0);
//texture maping of left field
int r,c,r1;
double p1,c1;
for(r=0;r<menu5.width;r++)
{
for(c=0;c<menu5.height;c++)
{
glBegin(GL_POINTS);
float rr=(float)(menu5.pixel(r,c,0));
float gg=(float)(menu5.pixel(r,c,1));
float bb=(float)(menu5.pixel(r,c,2));
glColor3f(rr/255,gg/255.0,bb/255.0);
if(!print_flag && j<30) printf("%3.0f,%3.0f,%3.0f, ",rr,gg,bb);
glVertex2d(r,c);
glEnd();
}
if(!print_flag)puts("");
}
if(!print_flag) printf("%d %d\n",r,c);
print_flag=1;
glPopMatrix();
glPushMatrix();
glLoadIdentity();
glTranslatef(250,100,0);
for(r=0,r1=0;r<=menu5.width;r++,r1+=1)
{
for(c=0,c1=0;c<=menu5.height;c++,c1+=1.55)
{
glBegin(GL_POINTS);
float rr=(float)(menu5.pixel(r,c,0));
float gg=(float)(menu5.pixel(r,c,1));
float bb=(float)(menu5.pixel(r,c,2));
glColor3f(rr/255,gg/255.0,bb/255.0);
for(p1=0;p1<=2;p1+=.25){
glVertex2d(r1+p1,c1+p1);
}
glEnd();
}
}
glPopMatrix();
}