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#include <iostream>
#include <fstream>
class Image {
public:
Image(int w, int h) :
w_(w), h_(h), colorByte_(3)
{
size_ = w * h * colorByte_;
data_ = new unsigned char[size_];
}
~Image(){
delete[] data_;
}
void setPixel(int x, int y, int r, int g, int b){
int pos = y * w_ * colorByte_ + x * colorByte_;
data_[pos] = r;
data_[pos+1] = g;
data_[pos+2] = b;
}
void getPixel(int x, int y, int* r, int* g, int* b) const {
int pos = y * w_ * colorByte_ + x * colorByte_;
*r = data_[pos];
*g = data_[pos+1];
*b = data_[pos+2];
}
int width() const { return w_; }
int height() const { return h_; }
private:
unsigned char * data_;
int colorByte_;
int w_;
int h_;
int size_;
};
class Printer {
public:
Printer()
: isStdout_(true)
{
}
Printer(std::string filename)
: filename_(filename), isStdout_(false)
{
}
void
print(Image & img)
{
std::ostream* sout;
std::ofstream fileout;
if (isStdout_){
sout = &std::cout;
}else{
fileout.open(filename_, std::ios::out);
sout = &fileout;
}
int w = img.width();
int h = img.height();
int lasti = w - 1;
*sout << "P3\n" << w << " " << h << "\n255\n";
for (int j=0; j<h; j++){
for (int i=0; i<w; i++){
int ri, gi, bi;
img.getPixel(i, j, &ri, &gi, &bi);
*sout << ri << " " << gi << " " << bi;
if (i == lasti){
*sout << "\n";
}else{
*sout << " ";
}
}
}
if (!isStdout_){
fileout.close();
}
}
private:
std::string filename_;
bool isStdout_;
};
void
draw(Image & img)
{
int w = img.width();
int h = img.height();
bool first = true;
for (int j=0; j<h; j++){
for (int i=0; i<w; i++){
float r = float(i)/float(w);
float g = float(j)/float(h);
float b = 0.2;
int ri = int(255.99f * r);
int gi = int(255.99f * g);
int bi = int(255.99f * b);
img.setPixel(i, j, ri, gi, bi);
}
}
}
void
print(Image & img)
{
int w = img.width();
int h = img.height();
int lasti = w - 1;
std::cout << "P3\n" << w << " " << h << "\n255\n";
for (int j=0; j<h; j++){
for (int i=0; i<w; i++){
int ri, gi, bi;
img.getPixel(i, j, &ri, &gi, &bi);
std::cout << ri << " " << gi << " " << bi;
if (i == lasti){
std::cout << "\n";
}else{
std::cout << " ";
}
}
}
}
void
printer()
{
Image img(200, 100);
draw(img);
// image
Printer printer("image.ppm");
printer.print(img);
// terminal
Printer printer;
printer.print(img);
}
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