Question

所以我在这里创建了这个图表绘图程序。但是我遇到了一些问题。首先，我应该描述一下这个程序是如何工作的。基本上使用stdscr并创建一个新的胜利我必须创建一个“函数生成器”程序。将在屏幕上打印Charcaters，它将模拟sin和余弦波形。当角色滚动窗口时，窗口将滚动。其中一个窗口将包含框架（标题，行，页脚）。另一个窗口将是滚动和打印正弦和余弦波形的窗口。我一直在检查我的代码，不管是什么，我都无法理解。

如果您仍然无法想象该程序，请考虑乒乓... 2条垂直线在顶部和底部，然后一条线穿过中间。在这个“球场”/屏幕上，正弦和余弦波将会被打印出来。

我的错误是罪和余弦不按我想要的方式打印......似乎它们已经超出了Newwin窗口的范围。从1 0 -1指定的页脚也不会移动到页脚中我想要的位置。

#include <curses.h>
#include <math.h>
#include "fmttime.h"
#include <sys/time.h>
#include <time.h>
#include <unistd.h>

enum colors
        {
        BLACK,
        RED,
        GREEN,
        YELLOW,
        BLUE,
        MAGENTA,
        CYAN,
        WHITE,
        };

void Sim_Advance(int degrees);          // Function prototype declarations
double Sim_Cos();
double Sim_Sin();
void frame(const char* title, int gridcolor, int labelcolor);
void mark(WINDOW* window, char ch, int color, double value);

static const double PI = (3.1415927/180); // Degrees to radian factor
static double PA = 0;                   // Phase angle
static int x;                           // X dimension of screen
static int y;                           // Y dimension of screen
static int delay1 = 300000;             // 300ms Delay

struct timeval tv;                      // Timeval object declaration

int main(void)
{
    initscr();                          // Curses.h initilizations
    cbreak();
    nodelay(stdscr, TRUE);
    noecho();


    int keyhit;
    int ctr = 1;                        // Exit flag
    int degrees = 10;                   // Interval to be added to phase
    int tempcounter = 1;
    char buf[32];                       // Buffer being sent to formattime
    size_t len = sizeof(buf);           // Size of buffer being passed
    gettimeofday(&tv, NULL);            // calling function for epoch time
    formatTime(&tv, buf, len);          // Calling formaTime for timestamp

    getmaxyx(stdscr,y,x);
    WINDOW* Window = newwin(y-4, x-2, 2, 5);
    scrollok(Window, TRUE);
    char cTitle[] = {"Real time Sine/ Cosine Plot"};  // Title string for plot


        while (ctr == 1)                // This will run the program till
        {                               // exit is detected (CTRL-X)
            usleep(delay1/6);           // Delays program execution
            keyhit = getch();

            mark(Window,'C', WHITE, Sim_Cos());


            mark(Window,'S', RED, Sim_Sin());

            Sim_Advance(degrees);       // Advances PA by "degrees" value (10)

                if (tempcounter == 1)
                {
                    frame(cTitle, WHITE, RED);  // Prints out the frame once
                    --tempcounter;
                }

                if (keyhit == 24)
                {
                    ctr = 0;            // Exit flag set
                }
        }
    endwin();
    return 0;
}

// Function will advance the Phase angle by assigned value of degrees
// The value of degrees must be an int and must be in radians

void Sim_Advance(int degrees)
{
    PA = PA + degrees;

    if (PA >=  360)
    {
        PA = PA - 360;

    }
}

// Calculates the Cos of the Phase angle and returns value to main

double Sim_Cos()
{
    double PARad;                       // Need to convert degrees into Radian
    PARad = (PA*PI);

    return cos(PARad);
}

// Calculates the Sin of the Phase angle and returns value to main

double Sim_Sin()
{
    double PARad2;                      // Variable to hold radian value
    PARad2 = (PA*PI);
    return sin(PARad2);
}

// Will print the grid and Axis of the display as well as a title for the display
// with variable background and/or foreground colors

void frame(const char* title, int gridcolor, int labelcolor)
{

    int offset = 27/2;                  // Middle of string
    int col = 0;
    int row = 0;
    int botline = 0;

    start_color();
    init_pair(0, labelcolor, BLACK);
    init_pair(1, gridcolor, BLACK);

    wmove(stdscr, 0, (x / 2)- offset);


    wprintw(stdscr,"%s\n", title);
    wrefresh(stdscr);

    while (row != x)                    // This prints the top line
    {
        attrset(COLOR_PAIR(1));
        wprintw(stdscr,"-");

        wrefresh(stdscr);
        ++row;
    }

    while (col != y-4)                  // This prints the middle line
    {
        wmove(stdscr, col + 2, x/2);
        wprintw(stdscr, "|\n");
        wrefresh(stdscr);
        ++col;
    }

    while (botline != x)                // Prints the bottom line
    {
        wprintw(stdscr, "-");
        wrefresh(stdscr);
        ++botline;
    }

    attrset(COLOR_PAIR(0));

    wmove(stdscr, y, 0);                // These three things commands
    wprintw(stdscr, "-1");              // Will print out the proper footer
    wrefresh(stdscr);


    wmove(stdscr, y, x/2);
    wprintw(stdscr, "0");
    wrefresh(stdscr);


    wmove(stdscr, y, x);
    wprintw(stdscr, "1");
    wrefresh(stdscr);

}

// Will print out the characters passed to it in the designated
// window to which it points to.

void mark(WINDOW* window, char ch, int color, double value)
{
    int cursep = (((x/2) * value) + (x/2)); // Prints character from middle
    int currenty = getcury(window);         // of screen
    wmove(window, currenty+1, cursep-3);    // Moves cursor to desired location
    wrefresh(window);
    usleep(delay1);
    waddch(window, ch);
    wrefresh(window);
}

Answer 1

部分解决方案（简化的帖子将有助于OP和SO）

使用double PI = (M_PI/ 180);或3.141592653589793 / 180
将正双精度转换为整数倒圆，将负转换为整数转换为整数。因此，请避免在0的两边使用double to int。
宽度为x。将屏幕视为x框。方框0的中心的值为-1.0。方框x-1的中心的值为+1.0。因此，从中心到中心的距离为x-1箱。

更改

int cursep = (((x / 2) * value) + (x / 2));

到

void mark() {
...
// value = -1.0 --> cursep = 0
// value = +1.0 --> cursep = x - 1
// ** Adjust these 4 vars as needed to re-map your translation **
double val_min = -1.0;
double val_max = +1.0;
int  cur_min = 0;
int  cur_max = x - 1;
//  y = (y1-y0)/(x1-x0)*(x-x0) + y0
double cur_d = (cur_max - cur_min)/(val_max - val_min)*(value - val_min) + cur_min;
int cursep = floor(cur_d + 0.5);

4 -3

wmove(window, currenty + 1, cursep - 3);

Sin和Cosine图表绘图仪.....一些算法错误C ++

1 个答案: