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93
Task/Draw-a-clock/C/draw-a-clock-1.c
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93
Task/Draw-a-clock/C/draw-a-clock-1.c
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#include <stdio.h>
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#include <stdlib.h>
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#include <math.h>
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#include <time.h>
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#include <sys/time.h>
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#define PI 3.14159265
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const char * shades = " .:-*ca&#%@";
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/* distance of (x, y) from line segment (0, 0)->(x0, y0) */
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double dist(double x, double y, double x0, double y0) {
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double l = (x * x0 + y * y0) / (x0 * x0 + y0 * y0);
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if (l > 1) {
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x -= x0;
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y -= y0;
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} else if (l >= 0) {
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x -= l * x0;
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y -= l * y0;
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}
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return sqrt(x * x + y * y);
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}
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enum { sec = 0, min, hur }; // for subscripts
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void draw(int size)
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{
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# define for_i for(int i = 0; i < size; i++)
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# define for_j for(int j = 0; j < size * 2; j++)
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double angle, cx = size / 2.;
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double sx[3], sy[3], sw[3];
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double fade[] = { 1, .35, .35 }; /* opacity of each arm */
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struct timeval tv;
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struct tm *t;
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/* set width of each arm */
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sw[sec] = size * .02;
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sw[min] = size * .03;
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sw[hur] = size * .05;
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every_second:
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gettimeofday(&tv, 0);
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t = localtime(&tv.tv_sec);
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angle = t->tm_sec * PI / 30;
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sy[sec] = -cx * cos(angle);
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sx[sec] = cx * sin(angle);
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angle = (t->tm_min + t->tm_sec / 60.) / 30 * PI;
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sy[min] = -cx * cos(angle) * .8;
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sx[min] = cx * sin(angle) * .8;
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angle = (t->tm_hour + t->tm_min / 60.) / 6 * PI;
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sy[hur] = -cx * cos(angle) * .6;
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sx[hur] = cx * sin(angle) * .6;
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printf("\033[s"); /* save cursor position */
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for_i {
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printf("\033[%d;0H", i); /* goto row i, col 0 */
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double y = i - cx;
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for_j {
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double x = (j - 2 * cx) / 2;
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int pix = 0;
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/* calcs how far the "pixel" is from each arm and set
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* shade, with some anti-aliasing. It's ghetto, but much
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* easier than a real scanline conversion.
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*/
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for (int k = hur; k >= sec; k--) {
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double d = dist(x, y, sx[k], sy[k]);
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if (d < sw[k] - .5)
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pix = 10 * fade[k];
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else if (d < sw[k] + .5)
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pix = (5 + (sw[k] - d) * 10) * fade[k];
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}
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putchar(shades[pix]);
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}
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}
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printf("\033[u"); /* restore cursor pos so you can bg the job -- value unclear */
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fflush(stdout);
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sleep(1); /* sleep 1 can at times miss a second, but will catch up next update */
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goto every_second;
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}
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int main(int argc, char *argv[])
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{
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int s;
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if (argc <= 1 || (s = atoi(argv[1])) <= 0) s = 20;
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draw(s);
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return 0;
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}
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214
Task/Draw-a-clock/C/draw-a-clock-2.c
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Task/Draw-a-clock/C/draw-a-clock-2.c
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// clockrosetta.c - https://rosettacode.org/wiki/Draw_a_clock
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// # Makefile
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// CFLAGS = -O3 -Wall -Wfatal-errors -Wpedantic -Werror
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// LDLIBS = -lX11 -lXext -lm
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// all: clockrosetta
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#define SIZE 500
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#include <X11/Xlib.h>
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#include <X11/Xutil.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <sys/select.h>
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#include <time.h>
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#include <X11/extensions/Xdbe.h>
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#include <math.h>
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static XdbeBackBuffer dbewindow = 0;
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static Display *display;
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static Window window;
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static int needseg = 1;
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static double d2r;
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static XSegment seg[61];
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static GC gc;
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static int mw = SIZE / 2;
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static int mh = SIZE / 2;
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static void
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draw(void)
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{
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struct tm *ptm;
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int i;
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double angle;
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double delta;
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int radius = (mw < mh ? mw : mh) - 2;
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XPoint pt[3];
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double onetwenty = 3.1415926 * 2 / 3;
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XdbeSwapInfo swapi;
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time_t newtime;
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if(dbewindow == 0)
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{
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dbewindow = XdbeAllocateBackBufferName(display, window, XdbeBackground);
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XClearWindow(display, window);
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}
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time(&newtime);
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ptm = localtime(&newtime);
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if(needseg)
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{
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d2r = atan2(1.0, 0.0) / 90.0;
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for(i = 0; i < 60; i++)
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{
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angle = (double)i * 6.0 * d2r;
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delta = i % 5 ? 0.97 : 0.9;
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seg[i].x1 = mw + radius * delta * sin(angle);
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seg[i].y1 = mh - radius * delta * cos(angle);
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seg[i].x2 = mw + radius * sin(angle);
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seg[i].y2 = mh - radius * cos(angle);
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}
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needseg = 0;
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}
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angle = (double)(ptm->tm_sec) * 6.0 * d2r;
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seg[60].x1 = mw;
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seg[60].y1 = mh;
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seg[60].x2 = mw + radius * 0.9 * sin(angle);
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seg[60].y2 = mh - radius * 0.9 * cos(angle);
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XDrawSegments(display, dbewindow, gc, seg, 61);
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angle = (double)ptm->tm_min * 6.0 * d2r;
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pt[0].x = mw + radius * 3 / 4 * sin(angle);
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pt[0].y = mh - radius * 3 / 4 * cos(angle);
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pt[1].x = mw + 6 * sin(angle + onetwenty);
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pt[1].y = mh - 6 * cos(angle + onetwenty);
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pt[2].x = mw + 6 * sin(angle - onetwenty);
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pt[2].y = mh - 6 * cos(angle - onetwenty);
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XFillPolygon(display, dbewindow, gc, pt, 3, Nonconvex, CoordModeOrigin);
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angle = (double)(ptm->tm_hour * 60 + ptm->tm_min) / 2.0 * d2r;
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pt[0].x = mw + radius / 2 * sin(angle);
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pt[0].y = mh - radius / 2 * cos(angle);
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pt[1].x = mw + 6 * sin(angle + onetwenty);
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pt[1].y = mh - 6 * cos(angle + onetwenty);
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pt[2].x = mw + 6 * sin(angle - onetwenty);
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pt[2].y = mh - 6 * cos(angle - onetwenty);
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XFillPolygon(display, dbewindow, gc, pt, 3, Nonconvex, CoordModeOrigin);
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swapi.swap_window = window;
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swapi.swap_action = XdbeBackground;
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XdbeSwapBuffers(display, &swapi, 1);
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}
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int
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main(int argc, char *argv[])
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{
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Atom wm_both_protocols[1];
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Atom wm_delete;
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Atom wm_protocols;
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Window root;
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XEvent event;
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XSetWindowAttributes attr;
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fd_set fd;
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int exposed = 0;
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int more = 1;
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struct timeval tv;
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display = XOpenDisplay(NULL);
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if(display == NULL)
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{
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fprintf(stderr,"Error: The display cannot be opened\n");
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exit(1);
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}
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root = DefaultRootWindow(display);
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wm_delete = XInternAtom(display, "WM_DELETE_WINDOW", False);
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wm_protocols = XInternAtom(display, "WM_PROTOCOLS", False);
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attr.background_pixel = 0x000000;
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attr.event_mask = KeyPress | KeyRelease |
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ButtonPressMask | ButtonReleaseMask | ExposureMask;
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window = XCreateWindow(display, root,
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0, 0, SIZE, SIZE, 0,
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CopyFromParent, InputOutput, CopyFromParent,
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CWBackPixel | CWEventMask,
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&attr
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);
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XStoreName(display, window, "Clock for RosettaCode");
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wm_both_protocols[0] = wm_delete;
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XSetWMProtocols(display, window, wm_both_protocols, 1);
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gc = XCreateGC(display, window, 0, NULL);
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XSetForeground(display, gc, 0xFFFF80);
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XMapWindow(display, window);
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while(more)
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{
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if(QLength(display) > 0)
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{
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XNextEvent(display, &event);
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}
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else
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{
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int maxfd = ConnectionNumber(display);
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XFlush(display);
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FD_ZERO(&fd);
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FD_SET(ConnectionNumber(display), &fd);
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event.type = LASTEvent;
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tv.tv_sec = 0;
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tv.tv_usec = 250000;
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if(select(maxfd + 1, &fd, NULL, NULL, &tv) > 0)
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{
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if(FD_ISSET(ConnectionNumber(display), &fd))
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{
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XNextEvent(display, &event);
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}
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}
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}
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switch(event.type)
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{
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case Expose:
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exposed = 1;
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draw();
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break;
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case ButtonRelease:
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case KeyRelease:
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more = 0;
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case ButtonPress: // ignore
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case KeyPress: // ignore
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break;
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case LASTEvent: // the timeout comes here
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if(exposed) draw();
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break;
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case ConfigureNotify:
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mw = event.xconfigure.width / 2;
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mh = event.xconfigure.height / 2;
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needseg = 1;
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break;
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case ClientMessage: // for close request from WM
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if(event.xclient.window == window &&
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event.xclient.message_type == wm_protocols &&
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event.xclient.format == 32 &&
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event.xclient.data.l[0] == wm_delete)
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{
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more = 0;
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}
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break;
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// default:
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// printf("unexpected event.type %d\n", event.type);;
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}
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}
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XCloseDisplay(display);
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exit(0);
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}
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// END
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