#include <u.h>#include <libc.h>#include <draw.h>#include <mouse.h>#include <keyboard.h>#include <thread.h> enum {	Dback = 0,	Dfhigh,	Dfmed,	Dflow,	Dfinv,	Dbhigh,	Dbmed,	Dblow,	Dbinv,	Numcolors, 	Knobleft360 = 0<<0,	Knobtop180 = 1<<0,	Knobvaluetop = 0<<1,	Knobvaluebot = 1<<1,}; #define MIN(a,b) ((a)<=(b)?(a):(b))#define MAX(a,b) ((a)>=(b)?(a):(b)) static struct {	char *id;	u32int color;}theme[Numcolors] = {	[Dback]  = {"background", 0x000000},	[Dfhigh] = {"f_high",     0xffffff},	[Dfmed]  = {"f_med",      0x777777},	[Dflow]  = {"f_low",      0x444444},	[Dfinv]  = {"f_inv",      0x000000},	[Dbhigh] = {"b_high",     0xdddddd},	[Dbmed]  = {"b_med",      0x72dec2},	[Dblow]  = {"b_low",      0x222222},	[Dbinv]  = {"b_inv",      0xffb545},}; typedef struct Style Style; struct Style {	struct {		int r;		int w;	}knob;	int margin;	Font *font;}; static Style style = {	.knob = {		.r = 24,		.w = 4,	},	.margin = 4,}; static Image *color[Numcolors];static Rectangle knobs[8][2]; static Rectangleknob(Rectangle r, char *d, char *vs, float v, int kt){	Point c, t, p0, p1;	int a, hw, dw, vw; 	dw = stringwidth(style.font, d);	vw = stringwidth(style.font, vs);	hw = MAX(style.knob.r, MAX(dw, vw)/2); /* "half width", center of the component */	r.max = r.min;	r.max.x += hw*2; 	/* value */	if (vw > 0 && !(kt&Knobvaluebot)) {valuebot:		t.x = r.min.x + hw - vw/2;		t.y = r.max.y;		string(screen, t, color[Dfhigh], ZP, style.font, vs);		r.max.y = t.y + style.font->height + style.margin;		if (kt & Knobvaluebot)			return r;	} 	/* knob */	a = (kt&Knobtop180) ? 90 : 180;	v = v*((kt&Knobtop180) ? -180 : -360);	c.x = r.min.x + Dx(r)/2;	c.y = r.max.y + style.knob.r;	fillarc(screen, c, style.knob.r, style.knob.r, color[Dfhigh], ZP, a, v);	fillellipse(screen, c, style.knob.r-style.knob.w, style.knob.r-style.knob.w, color[Dflow], ZP);	icossin(a+v, &p0.x, &p0.y);	p1.x = c.x + p0.x*(style.knob.r-style.knob.w*4/3)/1024;	p1.y = c.y - p0.y*(style.knob.r-style.knob.w*4/3)/1024;	p0.x = c.x + p0.x*style.knob.w*3/1024;	p0.y = c.y - p0.y*style.knob.w*3/1024;	line(screen, p0, p1, 0, 0, 0, color[Dfhigh], ZP);	r.max.y += 2*style.knob.r; 	/* description */	if (dw > 0) {		t.x = r.min.x + hw - dw/2;		t.y = r.max.y + style.margin;		string(screen, t, color[Dfhigh], ZP, style.font, d);		r.max.y = t.y + style.font->height;	} 	if (kt & Knobvaluebot) {		r.max.y += style.margin;		goto valuebot;	} 	return r;} static voidredraw(void){	float f;	Rectangle r, t;	char s[16];	int i; 	lockdisplay(display);	r = screen->r;	draw(screen, r, color[Dback], nil, ZP); 	r.min.x += style.margin;	r.min.y += style.margin;	for (i = 0; i < nelem(knobs); i++) {		f = (i+1)*0.1;		sprint(s, "%g", f);		t = knob(r, nil, s+1, f, Knobleft360);		knobs[i][0] = t;		r.min.y += Dy(t) + 2*style.margin; 		f = (i-4)*0.2;		sprint(s, "%+g", f);		if (s[2] != 0)			s[1] = s[0];		knobs[i][1] = knob(r, nil, s+1, f, Knobtop180|Knobvaluebot);		r = t;		r.min.x += Dx(r) + 2*style.margin;	} 	flushimage(display, 1);	unlockdisplay(display);} voidthreadmain(int argc, char **argv){	Mousectl *mctl;	Keyboardctl *kctl;	Rune key;	Mouse m;	int n, oldbuttons;	Point oldxy;	float zoom, oldzoom;	Style s;	Alt a[] = {		{ nil, &m, CHANRCV },		{ nil, nil, CHANRCV },		{ nil, &key, CHANRCV },		{ nil, nil, CHANEND },	}; 	USED(argc); USED(argv); 	if (initdraw(nil, nil, "daw/ui") < 0)		sysfatal("initdraw: %r");	style.font = font;	display->locking = 1;	unlockdisplay(display);	if ((mctl = initmouse(nil, screen)) == nil)		sysfatal("initmouse: %r");	if ((kctl = initkeyboard(nil)) == nil)		sysfatal("initkeyboard: %r"); 	for (n = 0; n < Numcolors; n++)		color[n] = allocimage(display, Rect(0, 0, 1, 1), RGB24, 1, theme[n].color<<8 | 0xff); 	a[0].c = mctl->c;	a[1].c = mctl->resizec;	a[2].c = kctl->c; 	threadsetname("daw/ui");	redraw();	oldbuttons = 0;	oldxy = ZP;	memmove(&s, &style, sizeof(s));	oldzoom = 1.0f; 	for (;;) {		switch (alt(a)) {		case 0: /* mouse */			if (m.buttons == 2) {				if (oldbuttons == 0) {					oldxy = m.xy;				} else if (oldbuttons == 2) {					zoom = MAX(0, oldzoom + m.xy.y-oldxy.y);					style.knob.r = s.knob.r*(1 + zoom/100.f);					style.knob.w = s.knob.w*(1 + zoom/100.f);					redraw();				}			} else if (m.buttons == 0) {				if (oldbuttons == 2)					oldzoom = zoom;			}			oldbuttons = m.buttons;			break; 		case 1: /* resize */			getwindow(display, Refnone);			redraw();			break; 		case 2: /* keyboard */			switch (key) {			case Kdel:				goto end;			}			break;		}	} end:	threadexitsall(nil);}