sleep()函数没有按预期工作

时间:2014-03-07 01:57:13

标签: c plot sleep

我之前遇到过类似的问题,但现在发生的事情是我正在尝试使用GNU libplot绘制五个圆圈,等待几秒钟,然后让窗口变黑。发生了什么是屏幕开始变黑,等待指定的时间,然后绘制。如何使用睡眠来获得所需的输出?我将省略代码,我将值分配给我的结构时间

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <ctype.h>
#include <plot.h>
#include <unistd.h>

struct body {
char color[10];
char size[4];
char mass[10];
char xpos[10];
char ypos[10];
};

int main() {

    struct body sun;
    struct body mercury;
    struct body venus;
    struct body earth;
    struct body mars;

    plPlotter *plotter;
    plPlotterParams *plotterParams;

    plotterParams = pl_newplparams();
    pl_setplparam(plotterParams, "BITMAPSIZE", "750x750");
    pl_setplparam(plotterParams, "USE_DOUBLE_BUFFERING", "no");
    pl_setplparam(plotterParams, "BG_COLOR", "black");

    if ((plotter = pl_newpl_r("X", stdin, stdout, stderr, plotterParams)) == NULL) {
        fprint(stderr, "Couldn't create Plotter\n");
        exit(1);
    } else if(pl_openpl_r(plotter) < 0) {
         fprintf(stderr, "Couldn't open Xwindows Plotter\n");
         exit(1);
    }

    pl_fspace_r(plotter, -2500, -2500, 2500, 2500);

    pl_pentype_r(plotter, 1);
    pl_filltype_r(plotter, 1);

    pl_pencolorname_r(plotter, "black");

    /* draw the sun */
    pl_fillcolorname_r(plotter, sun.color);
    pl_fcircle_r(plotter, atof(sun.size), atof(sun.ypos), atof(sun.size));

    /* I do this same thing 4 more times but with 
     * mercury, venus, earth, and mars
    */

    sleep(5); /* try to wait 5 seconds then sleep */

    /* close and cleanup */
    if (pl_close_pl_r(plotter) < 0) {
        fprintf(stderr, "Couldnt delete plotter\n");
    }
    else if (pl_deletepl_r(plotter) < 0) {
        fprintf(stderr, "Couldnt delete plotter\n");
    }

    return 0; 
}

1 个答案:

答案 0 :(得分:0)

你在哪里:

plotterParams = pl_newplparams();
pl_setplparam(plotterParams, "BITMAPSIZE", "750x750");
pl_setplparam(plotterParams, "USE_DOUBLE_BUFFERING", "no");
pl_setplparam(plotterParams, "BG_COLOR", "black"); 

您将“BG_COLOR”设置为黑色。

我不太了解这一组特定的工具,但看起来你从一开始就把背景设置为黑色。

在您的情况下,您想要做的是将它最初设置为白色(或其他),然后在完成后将其更改为黑色。希望这能让你走上正轨。