ohmu
·
2026-09-07
1/* Copyright 1985 Massachusetts Institute of Technology */
2#include <u.h>
3#include <libc.h>
4#include <draw.h>
5#include <event.h>
6
7#define add addpt
8#define sub subpt
9int wind = 1;
10
11typedef enum{
12 Odd=1,
13 Nonzero=~0
14}Windrule;
15#include "catback.p"
16#include "eyes.p"
17#define CATWID 150 /* width of body bitmap */
18#define CATHGT 300 /* height of body bitmap */
19#define TAILWID 150 /* width of tail bitmap */
20#define TAILHGT 89 /* height of tail bitmap */
21#define MINULEN 27 /* length of minute hand */
22#define HOURLEN 15 /* length of hour hand */
23#define HANDWID 4 /* width of clock hands */
24#define UPDATE (1000/NTAIL) /* ms/update -- tail waves at roughly 1/2 hz */
25#define BLACK (~0)
26#define WHITE 0
27#define NTP 7
28Point tp[NTP]={ /* tail polygon */
29 0, 0,
30 0,76,
31 3,82,
32 10,84,
33 18,82,
34 21,76,
35 21,70,
36};
37#define NTAIL 16
38Image *eye[NTAIL+1];
39Image *tail[NTAIL+1];
40Image *cat; /* cat body */
41Image *eyes; /* eye background */
42Point toffs={ 74, -15 }; /* tail polygon offset */
43Point tailoffs={0, 211}; /* tail bitmap offset, relative to body */
44Point eyeoffs={49, 30}; /* eye bitmap offset, relative to body */
45Point catoffs; /* cat offset, relative to screen */
46int xredraw;
47int crosseyed;
48void drawclock(void);
49void drawhand(int, int, double);
50void init(void);
51Image *draweye(double);
52Image *drawtail(double);
53Image *eballoc(Rectangle, int);
54//int myfillpoly(Image *, Point [], int, Windrule, int, Fcode);
55//void mydrawpoly(Image *, Point [], int, int, Fcode);
56Image *eballoc(Rectangle r, int chan){
57 Image *b=allocimage(display, r, chan, 0, DWhite);
58 if(b==0){
59 fprint(2, "catclock: can't allocate bitmap\n");
60 exits("allocimage");
61 }
62 return b;
63}
64
65void
66eloadimage(Image *i, Rectangle r, uchar *d, int nd)
67{
68 int n;
69 n = loadimage(i, r, d, nd);
70 if(n < nd) {
71 fprint(2, "loadimage fails: %r\n");
72 exits("loadimage");
73 }
74}
75
76int round_x(double x){
77 return x>=0.?x+.5:x-.5;
78}
79
80void
81redraw(Image *screen)
82{
83 Rectangle r = Rect(0,0,Dx(screen->r), Dy(screen->r));
84 catoffs.x=(Dx(r)-CATWID)/2;
85 catoffs.y=(Dy(r)-CATHGT)/2;
86 xredraw=1;
87}
88
89void
90eresized(int new)
91{
92 if(new && getwindow(display, Refmesg) < 0)
93 fprint(2,"can't reattach to window");
94 redraw(screen);
95}
96
97void main(int argc, char *argv[]){
98 int i;
99 ARGBEGIN{
100 case 'c': crosseyed++; break;
101 default:
102 fprint(2, "Usage: %s [-c]\n", argv0);
103 exits("usage");
104 }ARGEND
105 if(initdraw(0, 0, "cat clock") < 0)
106 sysfatal("initdraw: %r");
107 einit(Emouse);
108 redraw(screen);
109 for(i=0; i<nelem(catback_bits); i++)
110 catback_bits[i] ^= 0xFF;
111 for(i=0; i<nelem(eyes_bits); i++)
112 eyes_bits[i] ^= 0xFF;
113 cat=eballoc(Rect(0, 0, CATWID, CATHGT), GREY1);
114 eloadimage(cat, cat->r, catback_bits, sizeof(catback_bits));
115// wrbitmap(cat, cat->r.min.y, cat->r.max.y, catback_bits);
116 for(i=0;i<=NTAIL;i++){
117 tail[i]=drawtail(i*PI/NTAIL);
118 eye[i]=draweye(i*PI/NTAIL);
119 }
120 for(;;){
121 while(ecanmouse()) emouse(); /* don't get resize events without this! */
122 drawclock();
123 flushimage(display, 1);
124// bflush();
125 sleep(UPDATE);
126 }
127}
128/*
129 * Draw a clock hand, theta is clockwise angle from noon
130 */
131void drawhand(int length, int width, double theta){
132 double c=cos(theta), s=sin(theta);
133 double ws=width*s, wc=width*c;
134 Point vhand[4];
135 vhand[0]=add(screen->r.min, add(catoffs, Pt(CATWID/2+round_x(length*s), CATHGT/2-round_x(length*c))));
136 vhand[1]=add(screen->r.min, add(catoffs, Pt(CATWID/2-round_x(ws+wc), CATHGT/2+round_x(wc-ws))));
137 vhand[2]=add(screen->r.min, add(catoffs, Pt(CATWID/2-round_x(ws-wc), CATHGT/2+round_x(wc+ws))));
138 vhand[3] = vhand[0];
139 fillpoly(screen, vhand, 4, wind, display->white,
140 addpt(screen->r.min, vhand[0]));
141 poly(screen, vhand, 4, Endsquare, Endsquare, 0, display->black,
142 addpt(screen->r.min, vhand[0]));
143// myfillpoly(&screen, vhand, 3, Nonzero, WHITE, S);
144// mydrawpoly(&screen, vhand, 3, BLACK, S);
145}
146/*
147 * draw a cat tail, t is time (mod 1 second)
148 */
149Image *drawtail(double t){
150 Image *bp;
151 double theta=.4*sin(t+3.*PIO2)-.08; /* an assymetric tail leans to one side */
152 double s=sin(theta), c=cos(theta);
153 Point rtp[NTP];
154 int i;
155 bp=eballoc(Rect(0, 0, TAILWID, TAILHGT), GREY1);
156 for(i=0;i!=NTP;i++)
157 rtp[i]=add(Pt(tp[i].x*c+tp[i].y*s, -tp[i].x*s+tp[i].y*c), toffs);
158 fillpoly(bp, rtp, NTP, wind, display->black, rtp[0]);
159 return bp;
160}
161/*
162 * draw the cat's eyes, t is time (mod 1 second)
163 */
164Image *draweye(double t){
165 Image *bp;
166 double u;
167 double angle=0.7*sin(t+3*PIO2)+PI/2.0; /* direction eyes point */
168 Point pts[100];
169 int i, j;
170 struct{
171 double x, y, z;
172 }pt;
173 if(eyes==0){
174 eyes=eballoc(Rect(0, 0, eyes_width, eyes_height), GREY1);
175 eloadimage(eyes, eyes->r, eyes_bits, sizeof(eyes_bits));
176// wrbitmap(eyes, eyes->r.min.y, eyes->r.max.y, eyes_bits);
177 }
178 bp=eballoc(eyes->r, GREY1);
179 draw(bp, bp->r, eyes, nil, ZP);
180// bitblt(bp, bp->r.min, eyes, eyes->r, S);
181 for(i=0,u=-PI/2.0;u<PI/2.0;i++,u+=0.25){
182 pt.x=cos(u)*cos(angle+PI/7.0);
183 pt.y=sin(u);
184 pt.z=2.+cos(u)*sin(angle+PI/7.0);
185 pts[i].x=(pt.z==0.0?pt.x:pt.x/pt.z)*23.0+12.0;
186 pts[i].y=(pt.z==0.0?pt.y:pt.y/pt.z)*23.0+11.0;
187 }
188 for(u=PI/2.0;u>-PI/2.0;i++,u-=0.25){
189 pt.x=cos(u)*cos(angle-PI/7.0);
190 pt.y=sin(u);
191 pt.z=2.+cos(u)*sin(angle-PI/7.0);
192 pts[i].x=(pt.z==0.0?pt.x:pt.x/pt.z)*23.0+12.0;
193 pts[i].y=(pt.z==0.0?pt.y:pt.y/pt.z)*23.0+11.0;
194 }
195 fillpoly(bp, pts, i, wind, display->black, pts[0]);
196// fillpoly(bp, pts, i, Nonzero, BLACK, S);
197 if(crosseyed){
198 angle=0.7*sin(PI-t+3*PIO2)+PI/2.0;
199 for(i=0,u=-PI/2.0;u<PI/2.0;i++,u+=0.25){
200 pt.x=cos(u)*cos(angle+PI/7.0);
201 pt.y=sin(u);
202 pt.z=2.+cos(u)*sin(angle+PI/7.0);
203 pts[i].x=(pt.z==0.0?pt.x:pt.x/pt.z)*23.0+12.0;
204 pts[i].y=(pt.z==0.0?pt.y:pt.y/pt.z)*23.0+11.0;
205 }
206 for(u=PI/2.0;u>-PI/2.0;i++,u-=0.25){
207 pt.x=cos(u)*cos(angle-PI/7.0);
208 pt.y=sin(u);
209 pt.z=2.+cos(u)*sin(angle-PI/7.0);
210 pts[i].x=(pt.z==0.0?pt.x:pt.x/pt.z)*23.0+12.0;
211 pts[i].y=(pt.z==0.0?pt.y:pt.y/pt.z)*23.0+11.0;
212 }
213 }
214 for(j=0;j<i;j++) pts[j].x+=31;
215 fillpoly(bp, pts, i, wind, display->black, pts[0]);
216// fillpoly(bp, pts, i, Nonzero, BLACK, S);
217 return bp;
218}
219void
220drawclock(void){
221 static int t=0, dt=1;
222 static Tm otm;
223 Tm tm=*localtime(time(0));
224 tm.hour%=12;
225 if(xredraw || tm.min!=otm.min || tm.hour!=otm.hour){
226 if(xredraw){
227 draw(screen, screen->r, display->white, nil, ZP);
228 border(screen, screen->r, 4, display->black, ZP);
229 replclipr(screen, 0, insetrect(screen->r, 4));
230 //bitblt(&screen, screen.r.min, &screen, screen.r, Zero);
231 //border(&screen, screen.r, 4, F);
232 }
233 draw(screen, screen->r, cat, nil, mulpt(catoffs, -1));
234 flushimage(display, 1);
235 //bitblt(&screen, catoffs, cat, cat->r, S);
236 drawhand(MINULEN, HANDWID, 2.*PI*tm.min/60.);
237 drawhand(HOURLEN, HANDWID, 2.*PI*(tm.hour+tm.min/60.)/12.);
238 xredraw=0;
239 }
240 draw(screen, screen->r, tail[t], nil,
241 mulpt(add(catoffs, tailoffs), -1));
242 draw(screen, screen->r, eye[t], nil,
243 mulpt(add(catoffs, eyeoffs), -1));
244 //bitblt(&screen, add(catoffs, tailoffs), tail[t], tail[t]->r, S);
245 //bitblt(&screen, add(catoffs, eyeoffs), eye[t], eye[t]->r, S);
246 t+=dt;
247 if(t<0 || t>NTAIL){
248 t-=2*dt;
249 dt=-dt;
250 }
251 otm=tm;
252}
253#ifdef NOTDEF
254void drawpoly(Bitmap *dst, Point p[], int np, int v, Fcode f){
255 int i;
256 Point q=p[np-1];
257 for(i=0;i!=np;i++){
258 segment(dst, p[i], q, v, f);
259 q=p[i];
260 }
261}
262/*
263 * Fillpoly -- a polygon tiler
264 * Updating the edgelist from scanline to scanline could be quicker if no
265 * edges cross: we can just merge the incoming edges. The code can handle
266 * multiply-connected polygons with holes, but the interface can't. If
267 * the scan-line filling routine were a parameter, we could do textured
268 * polygons, polyblt, and other such stuff.
269 */
270typedef struct edge Edge;
271struct edge{
272 Point p; /* point of crossing current scan-line */
273 int maxy; /* scan line at which to discard edge */
274 int dx; /* x increment if x fraction<1 */
275 int dx1; /* x increment if x fraction>=1 */
276 int x; /* x fraction, scaled by den */
277 int num; /* x fraction increment for unit y change, scaled by den */
278 int den; /* x fraction increment for unit x change, scaled by num */
279 int dwind; /* increment of winding number on passing this edge */
280 Edge *next; /* next edge on current scanline */
281 Edge *prev; /* previous edge on current scanline */
282};
283void insert(Edge *ep, Edge **yp){
284 while(*yp && (*yp)->p.x<ep->p.x) yp=&(*yp)->next;
285 ep->next=*yp;
286 *yp=ep;
287 if(ep->next){
288 ep->prev=ep->next->prev;
289 ep->next->prev=ep;
290 if(ep->prev)
291 ep->prev->next=ep;
292 }
293 else
294 ep->prev=0;
295}
296int myfillpoly(Bitmap *b, Point vert[], int nvert, Windrule w, int v, Fcode f){
297 Edge *edges, *ep, *nextep, **ylist, **eylist, **yp;
298 Point *p, *q, *evert, p0, p1, p10;
299 int dy, nbig, y, left, right, wind, nwind;
300 edges=(Edge *)malloc(nvert*sizeof(Edge));
301 if(edges==0){
302 NoSpace:
303 return 0;
304 }
305 ylist=(Edge **)malloc((b->r.max.y-b->r.min.y)*sizeof(Edge *));
306 if(ylist==0) goto NoSpace;
307 eylist=ylist+(b->r.max.y-b->r.min.y);
308 for(yp=ylist;yp!=eylist;yp++) *yp=0;
309 evert=vert+nvert;
310 for(p=evert-1, q=vert, ep=edges;q!=evert;p=q, q++, ep++){
311 if(p->y==q->y) continue;
312 if(p->y<q->y){
313 p0=*p;
314 p1=*q;
315 ep->dwind=1;
316 }
317 else{
318 p0=*q;
319 p1=*p;
320 ep->dwind=-1;
321 }
322 if(p1.y<=b->r.min.y) continue;
323 if(p0.y>=b->r.max.y) continue;
324 ep->p=p0;
325 if(p1.y>b->r.max.y)
326 ep->maxy=b->r.max.y;
327 else
328 ep->maxy=p1.y;
329 p10=sub(p1, p0);
330 if(p10.x>=0){
331 ep->dx=p10.x/p10.y;
332 ep->dx1=ep->dx+1;
333 }
334 else{
335 p10.x=-p10.x;
336 ep->dx=-(p10.x/p10.y); /* this nonsense rounds toward zero */
337 ep->dx1=ep->dx-1;
338 }
339 ep->x=0;
340 ep->num=p10.x%p10.y;
341 ep->den=p10.y;
342 if(ep->p.y<b->r.min.y){
343 dy=b->r.min.y-ep->p.y;
344 ep->x+=dy*ep->num;
345 nbig=ep->x/ep->den;
346 ep->p.x+=ep->dx1*nbig+ep->dx*(dy-nbig);
347 ep->x%=ep->den;
348 ep->p.y=b->r.min.y;
349 }
350 insert(ep, ylist+(ep->p.y-b->r.min.y));
351 }
352 left=0;
353 for(yp=ylist,y=b->r.min.y;yp!=eylist;yp++,y++){
354 wind=0;
355 for(ep=*yp;ep;ep=nextep){
356 nwind=wind+ep->dwind;
357 if(nwind&w){ /* inside */
358 if(!(wind&w)){
359 left=ep->p.x;
360 if(left<b->r.min.x) left=b->r.min.x;
361 }
362 }
363 else if(wind&w){
364 right=ep->p.x;
365 if(right>=b->r.max.x) right=b->r.max.x;
366 if(right>left)
367 segment(b, Pt(left, y), Pt(right, y), v, f);
368 }
369 wind=nwind;
370 nextep=ep->next;
371 if(++ep->p.y!=ep->maxy){
372 ep->x+=ep->num;
373 if(ep->x>=ep->den){
374 ep->x-=ep->den;
375 ep->p.x+=ep->dx1;
376 }
377 else
378 ep->p.x+=ep->dx;
379 insert(ep, yp+1);
380 }
381 }
382 }
383 free((char *)edges);
384 free((char *)ylist);
385 return 1;
386}
387#endif