Chuyến động Xi-lanh [Kỹ thuật đồ họa]

/*

graphics in Dev-C++ - Vu Thanh Nam

*/

/* Minh hoa chuyen dong cua mot piston */

#include <conio.h>

#include <math.h>

#include <dos.h>

#include <winbgim.h>

/* 1 / sqrt(2) */

#define FCT 0.7071067

/* he so doi tu do sang radian */

#define RADS 0.017453293

#define RADIUS1 50

#define SQRRADIUS1 2500

#define RADIUS2 150

#define SQRRADIUS2 22500

void piston()

{

  double angle = 45, xc, yc, x1, y1, y2;

  xc = getmaxx() / 2;

  yc = getmaxy() / 2 + 100;

  setcolor(0);

  line(xc - 31, 110, xc-31, 265);

  line(xc - 32, 110, xc-32, 265);

  line(xc + 31, 110, xc+31, 265);

  line(xc + 32, 110, xc+32, 265);

  while (!kbhit())

  {

    x1 = xc + RADIUS1 * cos(angle * RADS);

    y1 = yc + RADIUS1 * sin(angle * RADS);

    y2 = y1 - sqrt(SQRRADIUS2 - SQRRADIUS1*cos((angle+90)*RADS)*cos((angle+90)*RADS));

    setcolor(3);

    rectangle(xc-30, y2 - 35, xc+30,y2+35);

    line(xc, yc, x1, y1);

    line(xc, y2, x1, y1);

    setfillstyle(SOLID_FILL, 1);

    fillellipse(xc, yc, 2, 2);

    fillellipse(x1, y1, 2, 2);

    fillellipse(xc, y2, 2, 2);

    delay(100);

    setcolor(1);

    rectangle(xc-30, y2 - 35, xc+30,y2+35);

    line(xc, yc, x1, y1);

    line(xc, y2, x1, y1);

    fillellipse(xc, yc, 2, 2);

    fillellipse(x1, y1, 2, 2);

    fillellipse(xc, y2, 2, 2);

    angle += 5;

  }

}

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

{

                // now, you can run project

                initwindow(700, 350);                                    // init window graphics

                setbkcolor(1);                                                                    // set background

                cleardevice();

                int gr_drive = DETECT, gr_mode;

                initgraph(&gr_drive, &gr_mode, "");

                piston();

                while(!kbhit()) delay(1);                               // pause screen               

                return 0;

}