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fplot: add support for readout with middle mouse button

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This commit is contained in:
aiju 2018-11-30 17:32:10 +00:00
parent 5b2f81a567
commit ec1976eb05
1 changed files with 53 additions and 1 deletions
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54
sys/src/cmd/fplot.c
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@ -118,6 +118,7 @@ int icolors[] = {
Image *colors[nelem(icolors)];
int cflag, aflag;
char *imagedata;
char *pixels;
int picx = 640, picy = 480;
typedef struct FRectangle FRectangle;
@ -378,8 +379,11 @@ pixel(int x, int y, int c)
p[0] = icolors[c] >> 24;
p[1] = icolors[c] >> 16;
p[2] = icolors[c] >> 8;
} else
}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
@ -577,6 +581,7 @@ drawgraphs(void)
gymin = Inf(1);
gymax = Inf(-1);
memset(pixels, 0, picx * picy);
for(i = 0; i < nfns; i++)
drawgraph(&fns[i], &screen->r, i % nelem(icolors));
if(!aflag)
@ -687,6 +692,40 @@ alloccolors(void)
}
}
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)
{
@ -721,6 +760,9 @@ main(int argc, char **argv)
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(;;) {
@ -728,6 +770,12 @@ main(int argc, char **argv)
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;
@ -758,6 +806,10 @@ eresized(int new)
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();
}