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/*
* Copyright (C) 2001-2002 Bart Massey and Jamey Sharp.
* All Rights Reserved. See the file COPYING in this directory
* for licensing information.
*/
#include <xcb.h>
#include "reply_formats.h"
#include <math.h>
#include <stdlib.h> /* for free(3) */
#include <unistd.h> /* for usleep(3) */
#include <stdio.h>
#include <assert.h>
#include <pthread.h>
#define LAG 0.3 /* lag angle for the follow line */
/* If I've done my math right, Linux maxes out at 100 fps on Intel (1000 fps
* on Alpha) due to the granularity of the kernel timer. */
#define FRAME_RATE 10.0 /* frames per second */
#define PI 3.14159265
static XCBConnection *c;
static GCONTEXT white, black;
#define WINS 8
static struct {
DRAWABLE w;
DRAWABLE p;
CARD16 width;
CARD16 height;
float angv;
} windows[WINS];
void *run(void *param);
void *event_thread(void *param);
int main()
{
pthread_t thr;
int i;
CARD32 mask = GCForeground | GCGraphicsExposures;
CARD32 values[2];
DRAWABLE root;
c = XCBConnectBasic();
root.window = c->roots[0].data->root;
white = XCBGCONTEXTNew(c);
black = XCBGCONTEXTNew(c);
pthread_create(&thr, 0, event_thread, 0);
values[1] = 0; /* no graphics exposures */
values[0] = c->roots[0].data->white_pixel;
XCBCreateGC(c, white, root, mask, values);
values[0] = c->roots[0].data->black_pixel;
XCBCreateGC(c, black, root, mask, values);
for(i = 1; i < WINS; ++i)
pthread_create(&thr, 0, run, (void*)i);
run((void*)0);
exit(0);
/*NOTREACHED*/
}
void paint(int idx)
{
XCBCopyArea(c, windows[idx].p, windows[idx].w, white, 0, 0, 0, 0,
windows[idx].width, windows[idx].height);
XCBSync(c, 0);
}
void *run(void *param)
{
int idx = (int)param;
int xo, yo;
double r, theta = 0;
POINT line[2];
windows[idx].w.window = XCBWINDOWNew(c);
windows[idx].p.pixmap = XCBPIXMAPNew(c);
windows[idx].width = 300;
line[0].x = xo = windows[idx].width / 2;
windows[idx].height = 300;
line[0].y = yo = windows[idx].height / 2;
windows[idx].angv = 0.05;
{
int ws = windows[idx].width * windows[idx].width;
int hs = windows[idx].height * windows[idx].height;
r = sqrt(ws + hs) + 1.0;
}
{
CARD32 mask = XCBCWBackPixel | XCBCWEventMask | XCBCWDontPropagate;
CARD32 values[3];
values[0] = c->roots[0].data->white_pixel;
values[1] = ButtonReleaseMask | ExposureMask;
values[2] = ButtonPressMask;
XCBCreateWindow(c, c->roots[0].depths[0].data->depth,
windows[idx].w.window, c->roots[0].data->root,
/* x */ 0, /* y */ 0,
windows[idx].width, windows[idx].height,
/* border */ 0, InputOutput,
/* visual */ c->roots[0].data->root_visual,
mask, values);
}
XCBMapWindow(c, windows[idx].w.window);
XCBCreatePixmap(c, c->roots[0].depths[0].data->depth,
windows[idx].p.pixmap, windows[idx].w,
windows[idx].width, windows[idx].height);
{
RECTANGLE rect = { 0, 0, windows[idx].width, windows[idx].height };
XCBPolyFillRectangle(c, windows[idx].p, white, 1, &rect);
}
XCBSync(c, 0);
while(1)
{
line[1].x = xo + r * cos(theta);
line[1].y = yo + r * sin(theta);
XCBPolyLine(c, CoordModeOrigin, windows[idx].p, black,
2, line);
line[1].x = xo + r * cos(theta + LAG);
line[1].y = yo + r * sin(theta + LAG);
XCBPolyLine(c, CoordModeOrigin, windows[idx].p, white,
2, line);
paint(idx);
theta += windows[idx].angv;
while(theta > 2 * PI)
theta -= 2 * PI;
while(theta < 0)
theta += 2 * PI;
usleep(1000000 / FRAME_RATE);
}
}
int lookup_window(WINDOW w)
{
int i;
for(i = 0; i < WINS; ++i)
if(windows[i].w.window.xid == w.xid)
return i;
return -1;
}
void *event_thread(void *param)
{
XCBGenericEvent *e;
int idx;
while(1)
{
e = XCBWaitEvent(c);
if(!formatEvent(e))
return 0;
if(e->response_type == XCBExpose)
{
XCBExposeEvent *ee = (XCBExposeEvent *) e;
idx = lookup_window(ee->window);
if(idx == -1)
fprintf(stderr, "Expose on unknown window!\n");
else
{
XCBCopyArea(c, windows[idx].p, windows[idx].w,
white, ee->x, ee->y, ee->x, ee->y,
ee->width, ee->height);
if(ee->count == 0)
XCBFlush(c);
}
}
else if(e->response_type == XCBButtonRelease)
{
XCBButtonReleaseEvent *bre = (XCBButtonReleaseEvent *) e;
idx = lookup_window(bre->event);
if(idx == -1)
fprintf(stderr, "ButtonRelease on unknown window!\n");
else
{
if(bre->detail.id == Button1)
windows[idx].angv = -windows[idx].angv;
else if(bre->detail.id == Button4)
windows[idx].angv += 0.001;
else if(bre->detail.id == Button5)
windows[idx].angv -= 0.001;
}
}
free(e);
}
}
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