可视化功能为在终端上通过左右键控制界面移动，

好的，你需要使用一个终端界面库来实现可视化功能。我推荐使用ncurses库，它是一个流行的终端界面库，可以在Linux和其他类Unix系统上使用。以下是一个使用ncurses库的例子，用于显示匹配结果：

#include <ncurses.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define REF_FILE "ref.fa"
#define RESULT_FILE "result.txt"

#define MAX_LINE_LENGTH 1024
#define MAX_NAME_LENGTH 128
#define MAX_SEQ_LENGTH 10000
#define MAX_RESULTS 1000

typedef struct {
    char name[MAX_NAME_LENGTH];
    int start;
    char seq[MAX_SEQ_LENGTH];
} sequence_t;

typedef struct {
    int start;
    int end;
    int len;
    int score;
} result_t;

int n_results = 0;
result_t results[MAX_RESULTS];

void load_ref(sequence_t *ref) {
    FILE *fp = fopen(REF_FILE, "r");
    char buf[MAX_LINE_LENGTH];
    int len = 0;
    while (fgets(buf, MAX_LINE_LENGTH, fp)) {
        if (buf[0] == '>') {
            if (len > 0) {
                ref->seq[len] = '\0';
                len = 0;
            }
            sscanf(buf, ">%s", ref->name);
        } else {
            strncpy(ref->seq + len, buf, MAX_SEQ_LENGTH - len);
            len += strlen(buf) - 1;
        }
    }
    if (len > 0) {
        ref->seq[len] = '\0';
    }
    fclose(fp);
}

void load_results(sequence_t *ref, sequence_t *seq) {
    FILE *fp = fopen(RESULT_FILE, "r");
    char buf[MAX_LINE_LENGTH];
    while (fgets(buf, MAX_LINE_LENGTH, fp)) {
        sscanf(buf, "%s %d %s", seq->name, &seq->start, seq->seq);
        int len = strlen(seq->seq);
        int score = 0;
        int i;
        for (i = 0; i < len; i++) {
            if (ref->seq[seq->start + i] == seq->seq[i]) {
                score++;
            }
        }
        result_t result;
        result.start = seq->start;
        result.end = seq->start + len - 1;
        result.len = len;
        result.score = score;
        results[n_results++] = result;
    }
    fclose(fp);
}

void print_result(WINDOW *win, sequence_t *ref, result_t *result) {
    char buf[MAX_LINE_LENGTH];
    snprintf(buf, MAX_LINE_LENGTH, "%s:%d-%d (%d/%d)", ref->name, result->start, result->end, result->score, result->len);
    wprintw(win, buf);
}

void print_results(WINDOW *win, sequence_t *ref) {
    int i;
    for (i = 0; i < n_results; i++) {
        wmove(win, i, 0);
        print_result(win, ref, &results[i]);
    }
    wrefresh(win);
}

int main() {
    sequence_t ref;
    sequence_t seq;
    load_ref(&ref);
    load_results(&ref, &seq);

    initscr();
    noecho();
    cbreak();
    keypad(stdscr, TRUE);

    int max_x, max_y;
    getmaxyx(stdscr, max_y, max_x);

    WINDOW *win = newwin(n_results, max_x, 0, 0);
    scrollok(win, TRUE);

    int pos_x = 0;
    int pos_y = 0;
    int scroll_x = 0;
    int scroll_y = 0;

    while (1) {
        wclear(win);
        print_results(win, &ref);
        wmove(win, pos_y - scroll_y, pos_x - scroll_x);
        wrefresh(win);

        int ch = getch();
        switch (ch) {
            case KEY_LEFT:
                if (pos_x > 0) {
                    pos_x--;
                }
                break;
            case KEY_RIGHT:
                if (pos_x < ref.start + strlen(ref.seq) - 1) {
                    pos_x++;
                }
                break;
            case KEY_UP:
                if (pos_y > 0) {
                    pos_y--;
                }
                break;
            case KEY_DOWN:
                if (pos_y < n_results - 1) {
                    pos_y++;
                }
                break;
            case KEY_PPAGE:
                if (scroll_y > 0) {
                    scroll_y--;
                }
                break;
            case KEY_NPAGE:
                if (scroll_y < n_results - max_y) {
                    scroll_y++;
                }
                break;
            case 'q':
                endwin();
                return 0;
            default:
                break;
        }
    }

    endwin();
    return 0;
}

这个例子假设你的ref.fa文件包含一个基因序列，result.txt文件包含需要匹配的字串。程序会对每个字串进行匹配，在终端上显示匹配结果。你可以通过左右键控制光标在基因序列上移动，通过上下键控制匹配结果在终端上的位置。按下PageUp和PageDown键可以滚动终端窗口。按下'q'键退出程序。这个例子只是一个简单的演示，你需要根据你的需求修改代码才能实现你想要的功能。