Home
Simple C++ Animation – Ultimate Color Randomness
Tags:, , , , , , , , , , ,

Simple C++ Animation – Ultimate Color Randomness

February 13, 2014 No Comments 32 bit, animation, beginner, c / c++, code, console, implementation, programming languages, Win32 API, windows

In yesterday’s post, the random rectangles are printed using console only without the help of any graphics. The basic type of each element/pixel in the console (code page 437) is defined in the following C/C++ structure:

1
2
3
4

typedef struct {
    unsigned char elem;
    unsigned char color;
} SCREENELEMENT;
typedef struct {
    unsigned char elem;
    unsigned char color;
} SCREENELEMENT;

Therefore, we can easily change the color and character of each pixel, to illustrate the ultimate color showing, we can use extended ASCII 219 to print out a solid square to the console.

1

const unsigned char BLACK = 219;
const unsigned char BLACK = 219;

Now, the core statements are just a few lines:

1
2
3
4
5
6
7
8

    for (;;) {
        for (int i = 0; i < height; i ++) {
            for (int j = 0; j < width; j ++) {
                s[i][j].color = rand() % 16;
            }
        }
        printScreen(width, height, s);
    }
    for (;;) {
        for (int i = 0; i < height; i ++) {
            for (int j = 0; j < width; j ++) {
                s[i][j].color = rand() % 16;
            }
        }
        printScreen(width, height, s);
    }

It gives the following output, you can use it as a screen saver (to rename the file extension from *.exe to *.scr)

random-color Simple C++ Animation - Ultimate Color Randomness 32 bit animation beginner c / c++ code console implementation programming languages Win32 API windows

The pre-compiled C++ animation application (g++ compiler/windows) can be downloaded [here cnt Simple C++ Animation - Ultimate Color Randomness 32 bit animation beginner c / c++ code console implementation programming languages Win32 API windows ].

The complete C++ source code is:

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79

/* http://HelloACM.com */
#include <iostream>
#include <stdio.h>
#include <windows.h>
#include <unistd.h> // usleep
#include <time.h> // for time
 
using namespace std;
 
const unsigned char BLACK = 219;
 
typedef struct {
    unsigned char elem;
    unsigned char color;
} SCREENELEMENT;
 
BOOL gotoxy(const WORD x, const WORD y) {
    COORD xy;
    xy.X = x;
    xy.Y = y;
    return SetConsoleCursorPosition(GetStdHandle(STD_OUTPUT_HANDLE), xy);
}
 
inline // update the screen
void printScreen(int width, int height, SCREENELEMENT **screen) {
    gotoxy(1, 1); // top-left corner
    for (int i = 0; i < height; i ++) {
        for (int j = 0; j < width; j ++) {             
                SCREENELEMENT *cur = &screen[i][j];             
                SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE), cur->color);
                printf("%c", cur->elem); // may be faster than cout
        }
    }
}
 
inline // initialize the screen with pixel se
void initScreen(int width, int height, SCREENELEMENT **screen, SCREENELEMENT se) {
    for (int i = 0; i < height; i ++) {
        for (int j = 0; j < width; j ++) {
            screen[i][j] = se;
        }
    }
}
 
int main() {
    SetConsoleOutputCP(437);
    CONSOLE_SCREEN_BUFFER_INFO csbi;
    int ret;
    /* get the width of the console */
    ret = GetConsoleScreenBufferInfo(GetStdHandle(STD_OUTPUT_HANDLE), &csbi);
    int width = 80;
    if (ret) {
        width = csbi.dwSize.X;
    }
    int height = csbi.srWindow.Bottom - csbi.srWindow.Top;
    SCREENELEMENT **s = new SCREENELEMENT*[height];
    for (int i = 0; i < height; i ++) {
        s[i] = new SCREENELEMENT[width];
    }
    SCREENELEMENT se;
    se.elem = BLACK;
    se.color = 0;
    initScreen(width, height, s, se);
    srand(time(NULL));
    for (;;) {
        for (int i = 0; i < height; i ++) {
            for (int j = 0; j < width; j ++) {
                s[i][j].color = rand() % 16;
            }
        }
        printScreen(width, height, s);
    }
    /* clean up */
    for (int i = 0; i < height; i ++) {
        delete[] s[i];
    }
    delete[] s; 
    return 0; /* use Ctrl+C, never returns */
}
/* http://HelloACM.com */
#include <iostream>
#include <stdio.h>
#include <windows.h>
#include <unistd.h> // usleep
#include <time.h> // for time

using namespace std;

const unsigned char BLACK = 219;

typedef struct {
    unsigned char elem;
    unsigned char color;
} SCREENELEMENT;

BOOL gotoxy(const WORD x, const WORD y) {
    COORD xy;
    xy.X = x;
    xy.Y = y;
    return SetConsoleCursorPosition(GetStdHandle(STD_OUTPUT_HANDLE), xy);
}

inline // update the screen
void printScreen(int width, int height, SCREENELEMENT **screen) {
    gotoxy(1, 1); // top-left corner
    for (int i = 0; i < height; i ++) {
        for (int j = 0; j < width; j ++) {             
                SCREENELEMENT *cur = &screen[i][j];             
                SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE), cur->color);
                printf("%c", cur->elem); // may be faster than cout
        }
    }
}

inline // initialize the screen with pixel se
void initScreen(int width, int height, SCREENELEMENT **screen, SCREENELEMENT se) {
    for (int i = 0; i < height; i ++) {
        for (int j = 0; j < width; j ++) {
            screen[i][j] = se;
        }
    }
}

int main() {
    SetConsoleOutputCP(437);
    CONSOLE_SCREEN_BUFFER_INFO csbi;
    int ret;
    /* get the width of the console */
    ret = GetConsoleScreenBufferInfo(GetStdHandle(STD_OUTPUT_HANDLE), &csbi);
    int width = 80;
    if (ret) {
        width = csbi.dwSize.X;
    }
    int height = csbi.srWindow.Bottom - csbi.srWindow.Top;
    SCREENELEMENT **s = new SCREENELEMENT*[height];
    for (int i = 0; i < height; i ++) {
        s[i] = new SCREENELEMENT[width];
    }
    SCREENELEMENT se;
    se.elem = BLACK;
    se.color = 0;
    initScreen(width, height, s, se);
    srand(time(NULL));
    for (;;) {
        for (int i = 0; i < height; i ++) {
            for (int j = 0; j < width; j ++) {
                s[i][j].color = rand() % 16;
            }
        }
        printScreen(width, height, s);
    }
    /* clean up */
    for (int i = 0; i < height; i ++) {
        delete[] s[i];
    }
    delete[] s; 
    return 0; /* use Ctrl+C, never returns */
}

–EOF (The Ultimate Computing & Technology Blog) —

GD Star Rating
loading...
595 words
Last Post: Simple C++ Animation on Console Windows - Random Squares on CodePage 437
Next Post: Modern getch() implementation on Windows C/C++

The Permanent URL is: Simple C++ Animation – Ultimate Color Randomness

Related posts:

  1. Modern gotoxy alternative C++ I believe some of you might have used Turbo C++ in the past. Turbo C++...
  2. Interview Coding Exercise – Nested String (Python) Nested String A string S consisting of N characters is considered to be properly nested...
  3. C++ Chess Board Printing in Windows Using CodePage 437 – Extended ASCII Well, most people, when they start programming in C/C++, they would like to print something...
  4. Tutorial 1 – C Programming for 6502 (8 bit) CPU 6502 CPUs were a massive success back in the 80s and early 90s. The 6502...
  5. Simple C++ Starfield Animation Based on Codepage 437 My second son, Ryan was born today 9/Feb/2014, so this is a gift for him....
  6. Two Pointer and Sliding Window Algorithm to Find K-Length Substrings With No Repeated Characters Given a string S, return the number of substrings of length K with no repeated...
  7. Pointer Arithmetic in Delphi Delphi is based on Object Pascal, which is a great programming language. Delphi is also...
  8. Teaching Kids Programming – Algorithms to Find the Cycle of a Linked List Teaching Kids Programming: Videos on Data Structures and Algorithms Given a Linked List, find out...

Leave a Reply