aboutsummaryrefslogtreecommitdiff
path: root/src/cmd/venti/srv/graph.c
blob: 9c906ad739af5babbd43d93e8587a6211a2fb0d1 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
#include "stdinc.h"
#include "dat.h"
#include "fns.h"

enum
{
	Top = 1,
	Bottom = 1,
	Left = 40,
	Right = 0,
	MinWidth = Left+Right+2,
	MinHeight = Top+Bottom+2,
	DefaultWidth = Left+Right+500,
	DefaultHeight = Top+Bottom+40
};

QLock memdrawlock;
static Memsubfont *smallfont;
static Memimage *black;
static Memimage *blue;
static Memimage *red;
static Memimage *lofill[6];
static Memimage *hifill[6];
static Memimage *grid;

static ulong fill[] = {
	0xFFAAAAFF,	0xBB5D5DFF,	/* peach */
	DPalegreygreen, DPurpleblue,	/* aqua */
	DDarkyellow, DYellowgreen,	/* yellow */
	DMedgreen, DDarkgreen,		/* green */
	0x00AAFFFF, 0x0088CCFF,	/* blue */
	0xCCCCCCFF, 0x888888FF,	/* grey */
};

Memimage*
allocrepl(ulong color)
{
	Memimage *m;
	
	m = allocmemimage(Rect(0,0,1,1), RGB24);
	memfillcolor(m, color);
	m->flags |= Frepl;
	m->clipr = Rect(-1000000, -1000000, 1000000, 1000000);
	return m;
}

static void
ginit(void)
{
	static int first = 1;
	int i;
	
	if(!first)
		return;
		
	first = 0;
	memimageinit();
#ifdef PLAN9PORT
	smallfont = openmemsubfont(unsharp("#9/font/lucsans/lstr.10"));
#else
	smallfont = openmemsubfont("/lib/font/bit/lucidasans/lstr.10");
#endif
	black = memblack;
	blue = allocrepl(DBlue);
	red = allocrepl(DRed);
	grid = allocrepl(0x77777777);
	for(i=0; i<nelem(fill)/2 && i<nelem(lofill) && i<nelem(hifill); i++){
		lofill[i] = allocrepl(fill[2*i]);
		hifill[i] = allocrepl(fill[2*i+1]);
	}
}

static void
mklabel(char *str, int v)
{
	if(v < 0){
		v = -v;
		*str++ = '-';
	}
	if(v < 10000)
		sprint(str, "%d", v);
	else if(v < 10000000)
		sprint(str, "%dk", v/1000);
	else
		sprint(str, "%dM", v/1000000);
}

static void
drawlabel(Memimage *m, Point p, int n)
{
	char buf[30];
	Point w;
	
	mklabel(buf, n);
	w = memsubfontwidth(smallfont, buf);
	memimagestring(m, Pt(p.x-5-w.x, p.y), memblack, ZP, smallfont, buf);
}

static int
scalept(int val, int valmin, int valmax, int ptmin, int ptmax)
{
	if(val <= valmin)
		val = valmin;
	if(val >= valmax)
		val = valmax;
	if(valmax == valmin)
		valmax++;
	return ptmin + (vlong)(val-valmin)*(ptmax-ptmin)/(valmax-valmin);
}

Memimage*
statgraph(Graph *g)
{
	int i, lastlo, nbin, x, lo, hi, min, max, first;
	Memimage *m;
	Rectangle r;
	Statbin *b, bin[2000];	/* 32 kB, but whack is worse */

	needstack(8192);	/* double check that bin didn't kill us */
	
	if(g->wid <= MinWidth)
		g->wid = DefaultWidth;
	if(g->ht <= MinHeight)
		g->ht = DefaultHeight;
	if(g->wid > nelem(bin))
		g->wid = nelem(bin);
	if(g->fill < 0)
		g->fill = ((uint)g->arg>>8)%nelem(lofill);
	if(g->fill > nelem(lofill))
		g->fill %= nelem(lofill);
	
	nbin = g->wid - (Left+Right);
	binstats(g->fn, g->arg, g->t0, g->t1, bin, nbin);

	/*
	 * compute bounds
	 */
	min = g->min;
	max = g->max;
	if(min < 0 || max <= min){
		min = max = 0;
		first = 1;
		for(i=0; i<nbin; i++){
			b = &bin[i];
			if(b->nsamp == 0)
				continue;
			if(first || b->min < min)
				min = b->min;
			if(first || b->max > max)
				max = b->max;
			first = 0;
		}
	}

	qlock(&memdrawlock);
	ginit();
	if(smallfont==nil || black==nil || blue==nil || red==nil || hifill==nil || lofill==nil){
		werrstr("graphics initialization failed: %r");
		qunlock(&memdrawlock);
		return nil;
	}

	/* fresh image */
	m = allocmemimage(Rect(0,0,g->wid,g->ht), ABGR32);
	if(m == nil){
		qunlock(&memdrawlock);
		return nil;
	}
	r = Rect(Left, Top, g->wid-Right, g->ht-Bottom);
	memfillcolor(m, DTransparent);
	
	/* x axis */
	memimagedraw(m, Rect(r.min.x, r.max.y, r.max.x, r.max.y+1), black, ZP, memopaque, ZP, S);

	/* y labels */
	drawlabel(m, r.min, max);
	if(min != 0)
		drawlabel(m, Pt(r.min.x, r.max.y-smallfont->height), min);
	
	/* actual data */
	lastlo = -1;
	for(i=0; i<nbin; i++){
		b = &bin[i];
		if(b->nsamp == 0)
			continue;
		lo = scalept(b->min, min, max, r.max.y, r.min.y);
		hi = scalept(b->max, min, max, r.max.y, r.min.y);
		x = r.min.x+i;
		hi-=2;
		if(0)
		if(lastlo != -1){
			if(lastlo < lo)
				memimagedraw(m, Rect(x-1, lastlo, x, lo), hifill[g->fill%nelem(hifill)], ZP, memopaque, ZP, S);
			else if(lastlo > lo)
				memimagedraw(m, Rect(x-1, lo, x, lastlo), hifill[g->fill%nelem(hifill)], ZP, memopaque, ZP, S);
		}
		memimagedraw(m, Rect(x, hi, x+1,lo), hifill[g->fill%nelem(hifill)], ZP, memopaque, ZP, S);
		memimagedraw(m, Rect(x, lo, x+1, r.max.y), lofill[g->fill%nelem(lofill)], ZP, memopaque, ZP, S);
		lastlo = lo;
	}

	if(bin[nbin-1].nsamp)
		drawlabel(m, Pt(r.max.x, r.min.y+(Dy(r)-smallfont->height)/2), bin[nbin-1].avg);
	qunlock(&memdrawlock);
	return m;
}