C++ 用RGB 三种颜色绘图

#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 GR(int,int);
unsigned char BL(int,int);
 
unsigned char RD(int i,int j){
    float s=3./(j+99);
    float y=(j+sin((i*i+_sq(j-700)*5)/100./DIM)*35)*s;
    return (int((i+DIM)*s+y)%2+int((DIM*2-i)*s+y)%2)*127;
}
unsigned char GR(int i,int j){
    float s=3./(j+99);
    float y=(j+sin((i*i+_sq(j-700)*5)/100./DIM)*35)*s;
    return (int(5*((i+DIM)*s+y))%2+int(5*((DIM*2-i)*s+y))%2)*127;
}
unsigned char BL(int i,int j){
    float s=3./(j+99);
    float y=(j+sin((i*i+_sq(j-700)*5)/100./DIM)*35)*s;
    return (int(29*((i+DIM)*s+y))%2+int(29*((DIM*2-i)*s+y))%2)*127;
}
void pixel_write(int,int);
FILE *fp;
int main(){
    fp = fopen("MathPic.png","wb");
    fprintf(fp, "P6
%d %d
255
", DIM, DIM);
    for(int j=0;j<DIM;j++)
        for(int i=0;i<DIM;i++)
            pixel_write(i,j);
    fclose(fp);
    return 0;
}
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);
}

# 上边代码保存为 draw.cpp  编译与运行

g++ draw.cpp -o draw  (编译)

./draw  (运行)


然后当前目录就会出现 MathPic.png

http://www.matrix67.com/blog/archives/6039

http://codegolf.stackexchange.com/questions/35569/tweetable-mathematical-art