};
double *stack, *sp;
+void omax(void) { sp--; if(sp[1]>*sp) *sp = sp[1]; }
+void omin(void) { sp--; if(sp[1]<*sp) *sp = sp[1]; }
void add(void) { sp--; *sp += *(sp+1); }
void sub(void) { sp--; *sp -= *(sp+1); }
void mul(void) { sp--; *sp *= *(sp+1); }
short prec;
void (*f)(void);
} ops[] = {
- "+", OBINARY, 0, 0, add,
- "-", OBINARY, 0, 0, sub,
- "*", OBINARY, 0, 100, mul,
- "/", OBINARY, 0, 100, div,
- "%", OBINARY, 0, 100, mod,
- "^", OBINARY, 1, 200, pot,
- "sin", OUNARY, 0, 300, osin,
- "cos", OUNARY, 0, 300, ocos,
- "tan", OUNARY, 0, 300, otan,
- "asin", OUNARY, 0, 300, oasin,
- "acos", OUNARY, 0, 300, oacos,
- "atan", OUNARY, 0, 300, oatan,
- "sqrt", OUNARY, 0, 300, osqrt,
- "exp", OUNARY, 0, 300, oexp,
- "log", OUNARY, 0, 300, olog,
- "ln", OUNARY, 0, 300, oln,
+ "max", OBINARY, 0, 0, omax,
+ "min", OBINARY, 0, 0, omax,
+ "+", OBINARY, 0, 100, add,
+ "-", OBINARY, 0, 100, sub,
+ "*", OBINARY, 0, 200, mul,
+ "/", OBINARY, 0, 200, div,
+ "%", OBINARY, 0, 200, mod,
+ "^", OBINARY, 1, 300, pot,
+ "sin", OUNARY, 0, 400, osin,
+ "cos", OUNARY, 0, 400, ocos,
+ "tan", OUNARY, 0, 400, otan,
+ "asin", OUNARY, 0, 400, oasin,
+ "acos", OUNARY, 0, 400, oacos,
+ "atan", OUNARY, 0, 400, oatan,
+ "sqrt", OUNARY, 0, 400, osqrt,
+ "exp", OUNARY, 0, 400, oexp,
+ "log", OUNARY, 0, 400, olog,
+ "ln", OUNARY, 0, 400, oln,
};
struct Constant {
double xmin = -10, xmax = 10;
double ymin = -10, ymax = 10;
double gymin, gymax;
-Image *color;
+int icolors[] = {
+ DBlack,
+ 0xCC0000FF,
+ 0x00CC00FF,
+ 0x0000CCFF,
+ 0xFF00CCFF,
+ 0xFFAA00FF,
+ 0xCCCC00FF,
+};
+Image *colors[nelem(icolors)];
int cflag, aflag;
char *imagedata;
+char *pixels;
int picx = 640, picy = 480;
typedef struct FRectangle FRectangle;
if(t->op->type == OBINARY)
while(opstackbot != nil && opstackbot->type == TOP &&
(opstackbot->op->prec > t->op->prec ||
- t->op->rassoc && opstackbot->op->prec == t->op->prec))
+ !t->op->rassoc && opstackbot->op->prec == t->op->prec))
pop(c);
push(t);
break;
}
void
-pixel(int x, int y)
+pixel(int x, int y, int c)
{
char *p;
if(x >= picx || y >= picy || x < 0 || y < 0)
return;
p = imagedata + (picx * y + x) * 3;
- p[0] = p[1] = p[2] = 0;
- } else
- draw(screen, Rect(x, y, x + 1, y + 1), color, nil, ZP);
+ p[0] = icolors[c] >> 24;
+ p[1] = icolors[c] >> 16;
+ p[2] = icolors[c] >> 8;
+ }else{
+ draw(screen, Rect(x, y, x + 1, y + 1), colors[c], nil, ZP);
+ if(ptinrect(Pt(x, y), screen->r))
+ pixels[picx * (y - screen->r.min.y) + (x - screen->r.min.x)] = 1;
+ }
}
void
-drawinter(Code *co, Rectangle *r, double x1, double x2, int n)
+drawinter(Code *co, Rectangle *r, double x1, double x2, int n, int c)
{
double y1, y2;
int iy1, iy2;
y1 = calc(co, x1);
if(!isNaN(y1)) {
iy1 = deconvy(r, y1);
- pixel(ix1, iy1);
+ pixel(ix1, iy1, c);
}
y2 = calc(co, x2);
if(!isNaN(y2)) {
iy2 = deconvy(r, y2);
- pixel(ix2, iy2);
+ pixel(ix2, iy2, c);
}
if(isNaN(y1) || isNaN(y2))
return;
return;
if(iy1 < r->min.y && iy2 < r->min.y)
return;
- drawinter(co, r, x1, (x1 + x2) / 2, n + 1);
- drawinter(co, r, (x1 + x2) / 2, x2, n + 1);
+ drawinter(co, r, x1, (x1 + x2) / 2, n + 1, c);
+ drawinter(co, r, (x1 + x2) / 2, x2, n + 1, c);
}
void
-drawgraph(Code *co, Rectangle *r)
+drawgraph(Code *co, Rectangle *r, int c)
{
int x;
- gymin = Inf(1);
- gymax = Inf(-1);
for(x = r->min.x; x < r->max.x; x++)
- drawinter(co, r, convx(r, x), convx(r, x + 1), 0);
+ drawinter(co, r, convx(r, x), convx(r, x + 1), 0, c);
}
void
drawgraphs(void)
{
int i;
-
- color = display->black;
+
+ gymin = Inf(1);
+ gymax = Inf(-1);
+ memset(pixels, 0, picx * picy);
for(i = 0; i < nfns; i++)
- drawgraph(&fns[i], &screen->r);
+ drawgraph(&fns[i], &screen->r, i % nelem(icolors));
if(!aflag)
drawaxes();
flushimage(display, 1);
picy = strtol(s, &s, 0);
}
+void
+alloccolors(void)
+{
+ int i;
+
+ for(i = 0; i < nelem(icolors); i++){
+ freeimage(colors[i]);
+ colors[i] = allocimage(display, Rect(0, 0, 1, 1), screen->chan, 1, icolors[i]);
+ }
+}
+
+void
+readout(Point p)
+{
+ int i, j;
+ double x, y;
+ vlong d, best;
+ Point bestp;
+ double ny, besty;
+ char buf[64];
+
+ /*TODO: do something more intelligent*/
+ best = (uvlong)(-1)>>1;
+ for(j = screen->r.min.y; j < screen->r.max.y; j++)
+ for(i = screen->r.min.x; i < screen->r.max.x; i++){
+ if(!pixels[(j - screen->r.min.y) * picx + (i - screen->r.min.x)]) continue;
+ d = (i - p.x) * (i - p.x) + (j - p.y) * (j - p.y);
+ if(d < best){
+ best = d;
+ bestp = Pt(i, j);
+ }
+ }
+ ellipse(screen, bestp, 3, 3, 0, display->black, ZP);
+ x = convx(&screen->r, bestp.x);
+ y = convy(&screen->r, bestp.y);
+ besty = calc(&fns[0], x);
+ for(i = 1; i < nfns; i++){
+ ny = calc(&fns[i], x);
+ if(abs(ny - y) < abs(besty - y))
+ besty = ny;
+ }
+ snprint(buf, sizeof(buf), "%#.4g %#.4g", x, besty);
+ string(screen, addpt(Pt(10, 10), screen->r.min), display->black, ZP, display->defaultfont, buf);
+}
+
void
main(int argc, char **argv)
{
r.max.x = picx;
r.max.y = picy;
for(i = 0; i < nfns; i++)
- drawgraph(&fns[i], &r);
+ drawgraph(&fns[i], &r, i % nelem(icolors));
if(write(1, imagedata, picx * picy * 3) < picx * picy * 3)
sysfatal("write: %r");
} else {
if(initdraw(nil, nil, "fplot") < 0)
sysfatal("initdraw: %r");
einit(Emouse | Ekeyboard);
+ picx = Dx(screen->r);
+ picy = Dy(screen->r);
+ pixels = emalloc(picx * picy);
+ alloccolors();
drawgraphs();
for(;;) {
switch(event(&e)) {
case Emouse:
if((e.mouse.buttons & 1) != 0)
zoom();
+ if(((lbut|e.mouse.buttons) & 2) != 0){
+ draw(screen, screen->r, display->white, nil, ZP);
+ drawgraphs();
+ }
+ if((e.mouse.buttons & 2) != 0)
+ readout(e.mouse.xy);
if((~e.mouse.buttons & lbut & 4) != 0)
unzoom();
lbut = e.mouse.buttons;
if(new) {
if(getwindow(display, Refnone) < 0)
sysfatal("getwindow: %r");
+ picx = Dx(screen->r);
+ picy = Dy(screen->r);
+ pixels = realloc(pixels, picx * picy);
+ if(pixels == nil) sysfatal("realloc: %r");
+ alloccolors();
drawgraphs();
}
}
projects / plan9front.git / blobdiff