improved on fplot
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aiju
parent
e140aa0aee
commit
e183ea231d
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@ -101,6 +101,10 @@ int nfns;
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Token *opstackbot;
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double xmin = -10, xmax = 10;
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double ymin = -10, ymax = 10;
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Image *color;
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int cflag;
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char *imagedata;
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int picx = 640, picy = 480;
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void *
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emalloc(int size)
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@ -317,62 +321,84 @@ calc(Code *c, double x)
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}
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double
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convx(Image *i, int x)
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convx(Rectangle *r, int x)
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{
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return (xmax - xmin) * (x - i->r.min.x) / (i->r.max.x - i->r.min.x) + xmin;
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return (xmax - xmin) * (x - r->min.x) / (r->max.x - r->min.x) + xmin;
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}
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int
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deconvx(Image *i, double dx)
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deconvx(Rectangle *r, double dx)
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{
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return (dx - xmin) * (i->r.max.x - i->r.min.x) / (xmax - xmin) + i->r.min.x + 0.5;
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return (dx - xmin) * (r->max.x - r->min.x) / (xmax - xmin) + r->min.x + 0.5;
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}
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double
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convy(Image *i, int y)
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convy(Rectangle *r, int y)
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{
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return (ymax - ymin) * (i->r.max.y - y) / (i->r.max.y - i->r.min.y) + ymin;
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return (ymax - ymin) * (r->max.y - y) / (r->max.y - r->min.y) + ymin;
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}
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int
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deconvy(Image *i, double dy)
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deconvy(Rectangle *r, double dy)
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{
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return (ymax - dy) * (i->r.max.y - i->r.min.y) / (ymax - ymin) + i->r.min.y + 0.5;
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return (ymax - dy) * (r->max.y - r->min.y) / (ymax - ymin) + r->min.y + 0.5;
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}
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void
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drawinter(Code *co, Image *i, Image *c, double x1, double x2, int n)
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pixel(int x, int y)
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{
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char *p;
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if(cflag) {
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if(x >= picx || y >= picy || x < 0 || y < 0)
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return;
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p = imagedata + (picx * y + x) * 3;
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p[0] = p[1] = p[2] = 0;
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} else
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draw(screen, Rect(x, y, x + 1, y + 1), color, nil, ZP);
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}
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void
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drawinter(Code *co, Rectangle *r, double x1, double x2, int n)
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{
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double y1, y2;
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int iy1, iy2;
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int ix1, ix2;
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ix1 = deconvx(i, x1);
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ix2 = deconvx(i, x2);
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ix1 = deconvx(r, x1);
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ix2 = deconvx(r, x2);
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iy1 = iy2 = 0;
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y1 = calc(co, x1);
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if(!isNaN(y1)) {
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iy1 = deconvy(i, y1);
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draw(i, Rect(ix1, iy1, ix1 + 1, iy1 + 1), c, nil, ZP);
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iy1 = deconvy(r, y1);
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pixel(ix1, iy1);
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}
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y2 = calc(co, x2);
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if(!isNaN(y2)) {
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iy2 = deconvy(i, y2);
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draw(i, Rect(ix2, iy2, ix2 + 1, iy2 + 1), c, nil, ZP);
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}
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if(!isNaN(y1) && !isNaN(y2) && (iy2 < iy1 - 1 || iy2 > iy1 + 1) && n < 10) {
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drawinter(co, i, c, x1, (x1 + x2) / 2, n + 1);
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drawinter(co, i, c, (x1 + x2) / 2, x2, n + 1);
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iy2 = deconvy(r, y2);
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pixel(ix2, iy2);
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}
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if(isNaN(y1) || isNaN(y2))
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return;
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if(n >= 10)
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return;
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if(iy2 >= iy1 - 1 && iy2 <= iy1 + 1)
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return;
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if(iy1 > r->max.y && iy2 > r->max.y)
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return;
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if(iy1 < r->min.y && iy2 < r->min.y)
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return;
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drawinter(co, r, x1, (x1 + x2) / 2, n + 1);
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drawinter(co, r, (x1 + x2) / 2, x2, n + 1);
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}
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void
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drawgraph(Code *co, Image *i, Image *c)
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drawgraph(Code *co, Rectangle *r)
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{
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int x;
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for(x = i->r.min.x; x < i->r.max.x; x++)
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drawinter(co, i, c, convx(i, x), convx(i, x + 1), 0);
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for(x = r->min.x; x < r->max.x; x++)
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drawinter(co, r, convx(r, x), convx(r, x + 1), 0);
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}
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void
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@ -380,15 +406,16 @@ drawgraphs(void)
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{
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int i;
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color = display->black;
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for(i = 0; i < nfns; i++)
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drawgraph(&fns[i], screen, display->black);
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drawgraph(&fns[i], &screen->r);
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flushimage(display, 1);
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}
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void
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usage(void)
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{
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fprint(2, "usage: fplot function\n");
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fprint(2, "usage: fplot [-c [-s size]] [-r range] functions ...\n");
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exits("usage");
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}
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@ -403,10 +430,10 @@ zoom(void)
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r = egetrect(1, &m);
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if(r.min.x == 0 && r.min.y == 0 && r.max.x == 0 && r.max.y == 0)
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return;
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xmin_ = convx(screen, r.min.x);
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xmax_ = convx(screen, r.max.x);
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ymin_ = convy(screen, r.max.y);
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ymax_ = convy(screen, r.min.y);
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xmin_ = convx(&screen->r, r.min.x);
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xmax_ = convx(&screen->r, r.max.x);
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ymin_ = convy(&screen->r, r.max.y);
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ymax_ = convy(&screen->r, r.min.y);
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xmin = xmin_;
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xmax = xmax_;
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ymin = ymin_;
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@ -432,25 +459,74 @@ parsefns(int n, char **s)
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stack = emalloc(sizeof(*stack) * max);
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}
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void
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parserange(char *s)
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{
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while(*s && !isdigit(*s)) s++;
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if(*s == 0) return;
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xmin = strtod(s, &s);
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while(*s && !isdigit(*s)) s++;
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if(*s == 0) return;
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xmax = strtod(s, &s);
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while(*s && !isdigit(*s)) s++;
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if(*s == 0) return;
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ymin = strtod(s, &s);
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while(*s && !isdigit(*s)) s++;
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if(*s == 0) return;
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ymax = strtod(s, &s);
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}
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void
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parsesize(char *s)
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{
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while(*s && !isdigit(*s)) s++;
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if(*s == 0) return;
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picx = strtol(s, &s, 0);
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while(*s && !isdigit(*s)) s++;
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if(*s == 0) return;
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picy = strtol(s, &s, 0);
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}
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void
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main(int argc, char **argv)
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{
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Event e;
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Rectangle r;
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int i;
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if(argc < 2)
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ARGBEGIN {
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case 'r': parserange(EARGF(usage())); break;
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case 's': parsesize(EARGF(usage())); break;
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case 'c': cflag++; break;
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default: usage();
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} ARGEND;
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if(argc < 1)
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usage();
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setfcr(getfcr() & ~(FPZDIV | FPINVAL));
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parsefns(argc - 1, argv + 1);
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if(initdraw(nil, nil, "fplot") < 0)
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sysfatal("initdraw: %r");
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einit(Emouse | Ekeyboard);
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drawgraphs();
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for(;;) {
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switch(event(&e)) {
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case Ekeyboard:
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switch(e.kbdc) {
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case 'q': exits(nil);
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case 'z': zoom();
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parsefns(argc, argv);
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if(cflag) {
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imagedata = emalloc(picx * picy * 3);
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memset(imagedata, 0xFF, picx * picy * 3);
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print("%11s %11d %11d %11d %11d ", "r8g8b8", 0, 0, picx, picy);
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r.min.x = r.min.y = 0;
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r.max.x = picx;
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r.max.y = picy;
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for(i = 0; i < nfns; i++)
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drawgraph(&fns[i], &r);
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if(write(1, imagedata, picx * picy * 3) < picx * picy * 3)
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sysfatal("write: %r");
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} else {
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if(initdraw(nil, nil, "fplot") < 0)
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sysfatal("initdraw: %r");
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einit(Emouse | Ekeyboard);
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drawgraphs();
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for(;;) {
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switch(event(&e)) {
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case Ekeyboard:
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switch(e.kbdc) {
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case 'q': exits(nil);
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case 'z': zoom();
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}
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}
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}
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}
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