ref: 899ec4d0b568a6d51a85e5344733a2189a7ba1ec
dir: /sys/src/games/catclock.c/
/* Copyright 1985 Massachusetts Institute of Technology */
#include <u.h>
#include <libc.h>
#include <draw.h>
#include <event.h>
#define add addpt
#define sub subpt
int wind = 1;
typedef enum{
Odd=1,
Nonzero=~0
}Windrule;
#include "catback.p"
#include "eyes.p"
#define CATWID 150 /* width of body bitmap */
#define CATHGT 300 /* height of body bitmap */
#define TAILWID 150 /* width of tail bitmap */
#define TAILHGT 89 /* height of tail bitmap */
#define MINULEN 27 /* length of minute hand */
#define HOURLEN 15 /* length of hour hand */
#define HANDWID 4 /* width of clock hands */
#define UPDATE (1000/NTAIL) /* ms/update -- tail waves at roughly 1/2 hz */
#define BLACK (~0)
#define WHITE 0
#define NTP 7
Point tp[NTP]={ /* tail polygon */
0, 0,
0,76,
3,82,
10,84,
18,82,
21,76,
21,70,
};
#define NTAIL 16
Image *eye[NTAIL+1];
Image *tail[NTAIL+1];
Image *cat; /* cat body */
Image *eyes; /* eye background */
Point toffs={ 74, -15 }; /* tail polygon offset */
Point tailoffs={0, 211}; /* tail bitmap offset, relative to body */
Point eyeoffs={49, 30}; /* eye bitmap offset, relative to body */
Point catoffs; /* cat offset, relative to screen */
int xredraw;
int crosseyed;
void drawclock(void);
void drawhand(int, int, double);
void init(void);
Image *draweye(double);
Image *drawtail(double);
Image *eballoc(Rectangle, int);
//int myfillpoly(Image *, Point [], int, Windrule, int, Fcode);
//void mydrawpoly(Image *, Point [], int, int, Fcode);
Image *eballoc(Rectangle r, int chan){
Image *b=allocimage(display, r, chan, 0, DWhite);
if(b==0){
fprint(2, "catclock: can't allocate bitmap\n");
exits("allocimage");
}
return b;
}
void
eloadimage(Image *i, Rectangle r, uchar *d, int nd)
{
int n;
n = loadimage(i, r, d, nd);
if(n < nd) {
fprint(2, "loadimage fails: %r\n");
exits("loadimage");
}
}
int round(double x){
return x>=0.?x+.5:x-.5;
}
void
redraw(Image *screen)
{
Rectangle r = Rect(0,0,Dx(screen->r), Dy(screen->r));
catoffs.x=(Dx(r)-CATWID)/2;
catoffs.y=(Dy(r)-CATHGT)/2;
xredraw=1;
}
void
eresized(int new)
{
if(new && getwindow(display, Refmesg) < 0)
fprint(2,"can't reattach to window");
redraw(screen);
}
void main(int argc, char *argv[]){
int i;
ARGBEGIN{
case 'c': crosseyed++; break;
default:
fprint(2, "Usage: %s [-c]\n", argv0);
exits("usage");
}ARGEND
if(initdraw(0, 0, "cat clock") < 0)
sysfatal("initdraw: %r");
einit(Emouse);
redraw(screen);
for(i=0; i<nelem(catback_bits); i++)
catback_bits[i] ^= 0xFF;
for(i=0; i<nelem(eyes_bits); i++)
eyes_bits[i] ^= 0xFF;
cat=eballoc(Rect(0, 0, CATWID, CATHGT), GREY1);
eloadimage(cat, cat->r, catback_bits, sizeof(catback_bits));
// wrbitmap(cat, cat->r.min.y, cat->r.max.y, catback_bits);
for(i=0;i<=NTAIL;i++){
tail[i]=drawtail(i*PI/NTAIL);
eye[i]=draweye(i*PI/NTAIL);
}
for(;;){
while(ecanmouse()) emouse(); /* don't get resize events without this! */
drawclock();
flushimage(display, 1);
// bflush();
sleep(UPDATE);
}
}
/*
* Draw a clock hand, theta is clockwise angle from noon
*/
void drawhand(int length, int width, double theta){
double c=cos(theta), s=sin(theta);
double ws=width*s, wc=width*c;
Point vhand[4];
vhand[0]=add(screen->r.min, add(catoffs, Pt(CATWID/2+round(length*s), CATHGT/2-round(length*c))));
vhand[1]=add(screen->r.min, add(catoffs, Pt(CATWID/2-round(ws+wc), CATHGT/2+round(wc-ws))));
vhand[2]=add(screen->r.min, add(catoffs, Pt(CATWID/2-round(ws-wc), CATHGT/2+round(wc+ws))));
vhand[3] = vhand[0];
fillpoly(screen, vhand, 4, wind, display->white,
addpt(screen->r.min, vhand[0]));
poly(screen, vhand, 4, Endsquare, Endsquare, 0, display->black,
addpt(screen->r.min, vhand[0]));
// myfillpoly(&screen, vhand, 3, Nonzero, WHITE, S);
// mydrawpoly(&screen, vhand, 3, BLACK, S);
}
/*
* draw a cat tail, t is time (mod 1 second)
*/
Image *drawtail(double t){
Image *bp;
double theta=.4*sin(t+3.*PIO2)-.08; /* an assymetric tail leans to one side */
double s=sin(theta), c=cos(theta);
Point rtp[NTP];
int i;
bp=eballoc(Rect(0, 0, TAILWID, TAILHGT), GREY1);
for(i=0;i!=NTP;i++)
rtp[i]=add(Pt(tp[i].x*c+tp[i].y*s, -tp[i].x*s+tp[i].y*c), toffs);
fillpoly(bp, rtp, NTP, wind, display->black, rtp[0]);
return bp;
}
/*
* draw the cat's eyes, t is time (mod 1 second)
*/
Image *draweye(double t){
Image *bp;
double u;
double angle=0.7*sin(t+3*PIO2)+PI/2.0; /* direction eyes point */
Point pts[100];
int i, j;
struct{
double x, y, z;
}pt;
if(eyes==0){
eyes=eballoc(Rect(0, 0, eyes_width, eyes_height), GREY1);
eloadimage(eyes, eyes->r, eyes_bits, sizeof(eyes_bits));
// wrbitmap(eyes, eyes->r.min.y, eyes->r.max.y, eyes_bits);
}
bp=eballoc(eyes->r, GREY1);
draw(bp, bp->r, eyes, nil, ZP);
// bitblt(bp, bp->r.min, eyes, eyes->r, S);
for(i=0,u=-PI/2.0;u<PI/2.0;i++,u+=0.25){
pt.x=cos(u)*cos(angle+PI/7.0);
pt.y=sin(u);
pt.z=2.+cos(u)*sin(angle+PI/7.0);
pts[i].x=(pt.z==0.0?pt.x:pt.x/pt.z)*23.0+12.0;
pts[i].y=(pt.z==0.0?pt.y:pt.y/pt.z)*23.0+11.0;
}
for(u=PI/2.0;u>-PI/2.0;i++,u-=0.25){
pt.x=cos(u)*cos(angle-PI/7.0);
pt.y=sin(u);
pt.z=2.+cos(u)*sin(angle-PI/7.0);
pts[i].x=(pt.z==0.0?pt.x:pt.x/pt.z)*23.0+12.0;
pts[i].y=(pt.z==0.0?pt.y:pt.y/pt.z)*23.0+11.0;
}
fillpoly(bp, pts, i, wind, display->black, pts[0]);
// fillpoly(bp, pts, i, Nonzero, BLACK, S);
if(crosseyed){
angle=0.7*sin(PI-t+3*PIO2)+PI/2.0;
for(i=0,u=-PI/2.0;u<PI/2.0;i++,u+=0.25){
pt.x=cos(u)*cos(angle+PI/7.0);
pt.y=sin(u);
pt.z=2.+cos(u)*sin(angle+PI/7.0);
pts[i].x=(pt.z==0.0?pt.x:pt.x/pt.z)*23.0+12.0;
pts[i].y=(pt.z==0.0?pt.y:pt.y/pt.z)*23.0+11.0;
}
for(u=PI/2.0;u>-PI/2.0;i++,u-=0.25){
pt.x=cos(u)*cos(angle-PI/7.0);
pt.y=sin(u);
pt.z=2.+cos(u)*sin(angle-PI/7.0);
pts[i].x=(pt.z==0.0?pt.x:pt.x/pt.z)*23.0+12.0;
pts[i].y=(pt.z==0.0?pt.y:pt.y/pt.z)*23.0+11.0;
}
}
for(j=0;j<i;j++) pts[j].x+=31;
fillpoly(bp, pts, i, wind, display->black, pts[0]);
// fillpoly(bp, pts, i, Nonzero, BLACK, S);
return bp;
}
void
drawclock(void){
static int t=0, dt=1;
static Tm otm;
Tm tm=*localtime(time(0));
tm.hour%=12;
if(xredraw || tm.min!=otm.min || tm.hour!=otm.hour){
if(xredraw){
draw(screen, screen->r, display->white, nil, ZP);
border(screen, screen->r, 4, display->black, ZP);
replclipr(screen, 0, insetrect(screen->r, 4));
//bitblt(&screen, screen.r.min, &screen, screen.r, Zero);
//border(&screen, screen.r, 4, F);
}
draw(screen, screen->r, cat, nil, mulpt(catoffs, -1));
flushimage(display, 1);
//bitblt(&screen, catoffs, cat, cat->r, S);
drawhand(MINULEN, HANDWID, 2.*PI*tm.min/60.);
drawhand(HOURLEN, HANDWID, 2.*PI*(tm.hour+tm.min/60.)/12.);
xredraw=0;
}
draw(screen, screen->r, tail[t], nil,
mulpt(add(catoffs, tailoffs), -1));
draw(screen, screen->r, eye[t], nil,
mulpt(add(catoffs, eyeoffs), -1));
//bitblt(&screen, add(catoffs, tailoffs), tail[t], tail[t]->r, S);
//bitblt(&screen, add(catoffs, eyeoffs), eye[t], eye[t]->r, S);
t+=dt;
if(t<0 || t>NTAIL){
t-=2*dt;
dt=-dt;
}
otm=tm;
}
#ifdef NOTDEF
void drawpoly(Bitmap *dst, Point p[], int np, int v, Fcode f){
int i;
Point q=p[np-1];
for(i=0;i!=np;i++){
segment(dst, p[i], q, v, f);
q=p[i];
}
}
/*
* Fillpoly -- a polygon tiler
* Updating the edgelist from scanline to scanline could be quicker if no
* edges cross: we can just merge the incoming edges. The code can handle
* multiply-connected polygons with holes, but the interface can't. If
* the scan-line filling routine were a parameter, we could do textured
* polygons, polyblt, and other such stuff.
*/
typedef struct edge Edge;
struct edge{
Point p; /* point of crossing current scan-line */
int maxy; /* scan line at which to discard edge */
int dx; /* x increment if x fraction<1 */
int dx1; /* x increment if x fraction>=1 */
int x; /* x fraction, scaled by den */
int num; /* x fraction increment for unit y change, scaled by den */
int den; /* x fraction increment for unit x change, scaled by num */
int dwind; /* increment of winding number on passing this edge */
Edge *next; /* next edge on current scanline */
Edge *prev; /* previous edge on current scanline */
};
void insert(Edge *ep, Edge **yp){
while(*yp && (*yp)->p.x<ep->p.x) yp=&(*yp)->next;
ep->next=*yp;
*yp=ep;
if(ep->next){
ep->prev=ep->next->prev;
ep->next->prev=ep;
if(ep->prev)
ep->prev->next=ep;
}
else
ep->prev=0;
}
int myfillpoly(Bitmap *b, Point vert[], int nvert, Windrule w, int v, Fcode f){
Edge *edges, *ep, *nextep, **ylist, **eylist, **yp;
Point *p, *q, *evert, p0, p1, p10;
int dy, nbig, y, left, right, wind, nwind;
edges=(Edge *)malloc(nvert*sizeof(Edge));
if(edges==0){
NoSpace:
return 0;
}
ylist=(Edge **)malloc((b->r.max.y-b->r.min.y)*sizeof(Edge *));
if(ylist==0) goto NoSpace;
eylist=ylist+(b->r.max.y-b->r.min.y);
for(yp=ylist;yp!=eylist;yp++) *yp=0;
evert=vert+nvert;
for(p=evert-1, q=vert, ep=edges;q!=evert;p=q, q++, ep++){
if(p->y==q->y) continue;
if(p->y<q->y){
p0=*p;
p1=*q;
ep->dwind=1;
}
else{
p0=*q;
p1=*p;
ep->dwind=-1;
}
if(p1.y<=b->r.min.y) continue;
if(p0.y>=b->r.max.y) continue;
ep->p=p0;
if(p1.y>b->r.max.y)
ep->maxy=b->r.max.y;
else
ep->maxy=p1.y;
p10=sub(p1, p0);
if(p10.x>=0){
ep->dx=p10.x/p10.y;
ep->dx1=ep->dx+1;
}
else{
p10.x=-p10.x;
ep->dx=-(p10.x/p10.y); /* this nonsense rounds toward zero */
ep->dx1=ep->dx-1;
}
ep->x=0;
ep->num=p10.x%p10.y;
ep->den=p10.y;
if(ep->p.y<b->r.min.y){
dy=b->r.min.y-ep->p.y;
ep->x+=dy*ep->num;
nbig=ep->x/ep->den;
ep->p.x+=ep->dx1*nbig+ep->dx*(dy-nbig);
ep->x%=ep->den;
ep->p.y=b->r.min.y;
}
insert(ep, ylist+(ep->p.y-b->r.min.y));
}
left=0;
for(yp=ylist,y=b->r.min.y;yp!=eylist;yp++,y++){
wind=0;
for(ep=*yp;ep;ep=nextep){
nwind=wind+ep->dwind;
if(nwind&w){ /* inside */
if(!(wind&w)){
left=ep->p.x;
if(left<b->r.min.x) left=b->r.min.x;
}
}
else if(wind&w){
right=ep->p.x;
if(right>=b->r.max.x) right=b->r.max.x;
if(right>left)
segment(b, Pt(left, y), Pt(right, y), v, f);
}
wind=nwind;
nextep=ep->next;
if(++ep->p.y!=ep->maxy){
ep->x+=ep->num;
if(ep->x>=ep->den){
ep->x-=ep->den;
ep->p.x+=ep->dx1;
}
else
ep->p.x+=ep->dx;
insert(ep, yp+1);
}
}
}
free((char *)edges);
free((char *)ylist);
return 1;
}
#endif