MathPic.cpp

// NOTE: compile with g++ filename.cpp -std=c++11

#include <iostream>
#include <cmath>
#include <cstdlib>
#define DIM 1024
#define DM1 (DIM-1)
#define _sq(x) ((x)*(x)) // square
#define _cb(x) abs((x)*(x)*(x)) // absolute value of cube
#define _cr(x) (unsigned char)(pow((x),1.0/3.0)) // cube root

unsigned char RD(int i, int j)
{
	// YOUR CODE HERE
}
unsigned char GR(int i, int j)
{
	// YOUR CODE HERE
}
unsigned char BL(int i, int j)
{
	// YOUR CODE HERE
}

/*
unsigned char RD(int i,int j){
return (char)(_sq(cos(atan2(j-512,i-512)/2))*255);
}
 
unsigned char GR(int i,int j){
return (char)(_sq(cos(atan2(j-512,i-512)/2-2*acos(-1)/3))*255);
}
 
unsigned char BL(int i,int j){
return (char)(_sq(cos(atan2(j-512,i-512)/2+2*acos(-1)/3))*255);
}
*/

FILE *fp;
void pixel_write(int i, int j)
{
	static unsigned char color[3];
	color[0] = RD(i, j) & 255;
	color[1] = GR(i, j) & 255;
	color[2] = BL(i, j) & 255;
	fwrite(color, 1, 3, fp);
}
int main()
{
	fp = fopen("MathPic.ppm", "wb");
	fprintf(fp, "P6\n%d %d\n255\n", DIM, DIM);
	for(int j = 0; j < DIM; j++)
		for(int i = 0; i < DIM; i++)
			pixel_write(i, j);
	fclose(fp);
	return 0;
}