c - C语言中的滚动文本

Question

我想在屏幕上连续滚动文本。例如，

text = "Hello, how are you"

输出应该是:

Hello, how are you Hello, how are youHello, how are you Hello, how are you

and rotating from right to left.

So far I have compiled this:

#include <curses.h>
#include <unistd.h> // For sleep()
#include <string.h> // For strlen()

int main(int argc, char *argv[]) {

    char *text = argv[1];
    char *text = "Hello, how are you";
    int text_length;
    int i, max_x, max_y;

    // Get text length
    text_length = strlen(text);

    // Initialize screen for ncurses
    initscr();
    // Don't show cursor
    curs_set(0);
    // Get terminal dimensions
    //   getmaxyx(stdscr, max_y, max_x);
    // Clear the screen
    clear();

    // Scroll text back across the screen

    while (1) {
        getmaxyx(stdscr, max_y, max_x);

        if ((max_x - text_length) <= 1)
            i = max_x;
        else
            i = (max_x - text_length);

        for (i; i > 0; i--) {
            clear();

            mvaddstr(0, i, text);
            refresh();
            usleep(20000);
        }
    }
    // Wait for a keypress before quitting
    getch();

    endwin();

    return 0;
}

Can anybody help to change the code and do that?

Answer 1

你的问题太有趣了，我无法停止，直到我让它“起作用”:

#include <curses.h>
#include <unistd.h> // For sleep()
#include <string.h> // For strlen()
#include <stdlib.h> // For malloc()

int main(int argc, char* argv[])
{

    char *text = "Hello, how are you? ";
    char *scroll;
    int text_length;

    int i, max_x, max_y;

    // Get text length
    text_length = strlen(text);

    // Initialize screen for ncurses
    initscr();
    // Don't show cursor
    curs_set(0);
    // Get terminal dimensions
    //   getmaxyx(stdscr, max_y, max_x);
    // Clear the screen
    clear();

    getmaxyx(stdscr, max_y, max_x);
    scroll = malloc(2 * max_x + 1);

    for (i=0; i< 2*max_x; i++) {
            scroll[i] = text[i % text_length];
    }

    scroll[2*max_x - 1]='\0';


    // Scroll text back across the screen
    for (i=0; i < 10000; i++) {

            mvaddnstr(0,0,&scroll[i%max_x], max_x);
            refresh();
            usleep(20000);
    }
    // Wait for a keypress before quitting
    getch();

    endwin();

    return 0;
}

请注意，我作弊了:) (a) 我将字符串复制到足够大以始终填充屏幕(宽度的两倍) (b) 我不滚动打印位置，而是滚动 我要求打印的文本 (c) 我只是在原始输入字符串中放置了一个空格，因为它比通过其他机制放置空格更容易。

哦，是的，我删除了 clear() 调用，它使屏幕太困惑而无法真正看到。不过，我们会一遍又一遍地覆盖相同的 max_x 单元格，无需不断清除整个屏幕。

我希望这会有所帮助。