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compx.go
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compx.go
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// compx: display components and connections on a grid, given a XML description
// +build !appengine
package main
import (
"encoding/xml"
"flag"
"fmt"
"github.com/ajstarks/svgo"
"io"
"math"
"os"
"strconv"
"strings"
"time"
)
// Component XML structures
type Component struct {
Top int `xml:"top,attr"`
Left int `xml:"left,attr"`
Gutter int `xml:"gutter,attr"`
Gw int `xml:"gw,attr"`
Gh int `xml:"gh,attr"`
Gc string `xml:"gc,attr"`
Legend []legend `xml:"legend"`
Note []note `xml:"note"`
Group []group `xml:"group"`
Comp []comp `xml:"comp"`
}
type group struct {
Brow int `xml:"brow,attr"`
Bcol int `xml:"bcol,attr"`
Erow int `xml:"erow,attr"`
Ecol int `xml:"ecol,attr"`
Width int `xml:"width,attr"`
Height int `xml:"height,attr"`
Label string `xml:"label,attr"`
Color string `xml:"color,attr"`
Opacity float64 `xml:"opacity,attr"`
}
type note struct {
Row int `xml:"row,attr"`
Col int `xml:"col,attr"`
Width int `xml:"width,attr"`
Height int `xml:"height,attr"`
Size int `xml:"size,attr"`
Spacing int `xml:"spacing,attr"`
Align string `xml:"align,attr"`
Nitem []nitem `xml:"nitem"`
}
type legend struct {
Title string `xml:"title,attr"`
Row int `xml:"row,attr"`
Col int `xml:"col,attr"`
Width int `xml:"width,attr"`
Height int `xml:"height,attr"`
Size int `xml:"size,attr"`
Litem []litem `xml:"litem"`
}
type comp struct {
Id string `xml:"id,attr"`
Col int `xml:"col,attr"`
Row int `xml:"row,attr"`
Width int `xml:"width,attr"`
Height int `xml:"height,attr"`
Name string `xml:"name,attr"`
Os string `xml:"os,attr"`
Sw string `xml:"sw,attr"`
Color string `xml:"color,attr"`
Shape string `xml:"shape,attr"`
Image string `xml:"image,attr"`
Connect []Connect `xml:"connect"`
}
type litem struct {
Color string `xml:"color,attr"`
Type string `xml:"type,attr"`
Label string `xml:",chardata"`
}
type nitem struct {
Color string `xml:"color,attr"`
Align string `xml:"align,attr"`
Text string `xml:",chardata"`
}
// Connect defines connections
type Connect struct {
Sloc string `xml:"sloc,attr"`
Dloc string `xml:"dloc,attr"`
Dest string `xml:"dest,attr"`
Mark string `xml:"mark,attr"`
Color string `xml:"color,attr"`
Dir string `xml:"dir,attr"`
Label string `xml:",chardata"`
}
type gcomp struct {
x, y, w, h int
}
var (
width, height, fontscale int
linesize, labelfs, notchsize, groupmargin int
showtitle, showtimestamp, roundbox, arc, italiclabel bool
title, bgcolor, guide string
gridw = 0
gridh = 0
globalcolor = "black"
canvas = svg.New(os.Stdout)
)
const (
lcolor = "rgb(190,190,190)"
boxradius = 10
lopacity = "1.0"
defcolor = "black"
linefmt = "stroke:%s;fill:none"
globalstyle = "font-family:Calibri,sans-serif;font-size:%dpx;fill:black;text-anchor:middle;stroke-linecap:round;stroke-width:%dpx;stroke-opacity:%s"
ltstyle = "text-anchor:%s;fill:black"
legendstyle = "text-anchor:start;fill:black;font-size:%dpx"
gridstyle = "fill:none; stroke:gray; stroke-opacity:0.3"
notefmt = "font-size:%dpx"
ntfmt = "text-anchor:%s;fill:%s"
)
func background(fc string) { canvas.Rect(0, 0, width, height, "fill:"+fc) }
// docomp does XML file processing
func docomp(location string) {
var f *os.File
var err error
if len(location) > 0 {
f, err = os.Open(location)
} else {
f = os.Stdin
}
if err == nil {
readcomp(f)
f.Close()
} else {
fmt.Fprintf(os.Stderr, "%v\n", err)
}
}
// readcomp reads the XML into the component data structure
func readcomp(r io.Reader) {
var c Component
if err := xml.NewDecoder(r).Decode(&c); err == nil {
drawc(c)
} else {
fmt.Fprintf(os.Stderr, "Unable to parse components (%v)\n", err)
}
}
// drawc interprets the compoment data structure, and displays it
func drawc(c Component) {
gridw = c.Gw
gridh = c.Gh
if len(c.Gc) == 0 {
globalcolor = c.Gc
} else {
globalcolor = c.Gc
}
// Groups
for _, group := range c.Group {
dogroup(group, c.Top, c.Left, c.Gutter)
}
// Legends
for _, leg := range c.Legend {
dolegend(leg, c.Top, c.Left, c.Gutter, labelfs, labelfs+4)
}
// Notes
for _, note := range c.Note {
donote(note, c.Top, c.Left, c.Gutter)
}
// Components
for _, x := range c.Comp {
for _, y := range x.Connect {
connect(gc(x, c.Top, c.Left, c.Gutter), y.Sloc,
lookup(y.Dest, c.Comp, c.Top, c.Left, c.Gutter),
y.Dloc, y.Label, y.Mark, y.Dir, y.Color)
}
display(x, c.Top, c.Left, c.Gutter)
}
if len(guide) > 0 {
grid(c.Top, c.Left, c.Gutter)
}
if showtitle {
dotitle(c.Left, 30, title)
}
if showtimestamp {
timestamp(30)
}
}
// lookup returns a graphic object given an id
func lookup(id string, c []comp, t, l, g int) gcomp {
var x gcomp
for _, v := range c {
if id == v.Id {
return gc(v, t, l, g)
}
}
return x
}
// dotitle positions the title relative to the bottom of the drawing
func dotitle(left, offset int, t string) {
canvas.Text(left, height-offset, t, "font-size:200%;text-anchor:start")
}
// timestamp draws a timestamp in the lower right of the drawing
func timestamp(offset int) {
t := time.Now()
canvas.Text(width-offset, height-offset, t.Format(time.ANSIC), "text-anchor:end")
}
// grid displays a grid overlay, useful for determining optimal positioning
func grid(top, left, gutter int) {
gs := strings.SplitN(guide, `x`, 4)
if len(gs) != 4 {
return
}
w, _ := strconv.Atoi(gs[0])
h, _ := strconv.Atoi(gs[1])
nr, _ := strconv.Atoi(gs[2])
nc, _ := strconv.Atoi(gs[3])
canvas.Gstyle(gridstyle)
y := top
for r := 0; r < nr; r++ {
x := left
for c := 0; c < nc; c++ {
canvas.Rect(x, y, w, h)
canvas.Text(x+w/2, y+h/2, fmt.Sprintf("%d,%d", r, c),
"font-size:150%;fill:lightgray;stroke:none")
x += w + gutter
}
y += h + gutter
}
canvas.Gend()
}
// dogroup displays a colored rectangular area
func dogroup(g group, top, left, gutter int) {
margin := groupmargin
bx := colx(g.Bcol, g.Width, gutter, left)
by := rowy(g.Brow, g.Height, gutter, top)
ex := colx(g.Ecol, g.Width, gutter, left)
ey := rowy(g.Erow, g.Height, gutter, top)
gw := (ex + g.Width) - bx
gh := (ey + g.Height) - by
var gop float64
if g.Opacity <= 0 {
gop = 1.0
} else {
gop = g.Opacity
}
canvas.Rect(bx-margin, by-margin, gw+margin*2, gh+margin*2,
fmt.Sprintf("fill-opacity:%.2f;fill:%s", gop, g.Color))
if len(g.Label) > 0 {
canvas.Text(bx+gw/2, by+gh/2, g.Label, "fill:gray")
}
}
// dolegend displays the legend
func dolegend(leg legend, top, left, gutter, fs, ls int) {
if leg.Size > 0 {
fs = leg.Size
ls = fs + 4
}
fsh := fs / 2
x := colx(leg.Col, leg.Width, gutter, left)
y := rowy(leg.Row, leg.Height, gutter, top)
canvas.Gstyle(fmt.Sprintf(legendstyle, fs))
for _, v := range leg.Litem {
if v.Type == "line" {
canvas.Rect(x, y+fs/4, fs, fs/4, "fill:"+v.Color)
} else {
canvas.Square(x, y, fs, "fill:"+v.Color)
}
canvas.Text(x+(fs*2), y+fsh, v.Label, "baseline-shift:-30%")
y += ls
}
canvas.Gend()
}
// donote displays a note
func donote(n note, top, left, gutter int) {
var align, color string
size := n.Size
ls := n.Spacing
x := colx(n.Col, n.Width, gutter, left)
y := rowy(n.Row, n.Height, gutter, top)
if n.Align == "middle" {
y += n.Height / 2
}
if size <= 0 {
size = labelfs
}
if ls == 0 {
ls = size + 2
}
xp := x
canvas.Gstyle(fmt.Sprintf(notefmt, size))
for _, v := range n.Nitem {
switch v.Align {
case "left", "start", "begin":
align = "start"
xp = x
case "right", "end":
align = "end"
xp = x + n.Width
case "middle", "mid", "center":
align = "middle"
xp = x + (n.Width / 2)
default:
align = "start"
xp = x
}
if len(v.Color) == 0 {
color = "black"
} else {
color = v.Color
}
canvas.Text(xp, y, v.Text, fmt.Sprintf(ntfmt, align, color))
y += ls
}
canvas.Gend()
}
// gc computes the components coordinates
func gc(c comp, top, left, gutter int) gcomp {
var g gcomp
// the object and grid dimensions equal, unless explicitly overridden
if gridw > 0 && gridh > 0 {
g.x = colx(c.Col, gridw, gutter, left)
g.y = rowy(c.Row, gridh, gutter, top)
} else {
g.x = colx(c.Col, c.Width, gutter, left)
g.y = rowy(c.Row, c.Height, gutter, top)
}
g.w = c.Width
g.h = c.Height
return g
}
// display a component in the context of the grid
func display(c comp, top, left, gutter int) {
g := gc(c, top, left, gutter)
component(g, c)
}
// component positions and draws a components and its attributes
func component(g gcomp, c comp) {
x := g.x
y := g.y
w := g.w
h := g.h
fs := w / fontscale
fs2 := fs / 2
w2 := w / 2
h3 := h / 3
var boxcolor string
if len(c.Color) == 0 {
boxcolor = globalcolor
} else {
boxcolor = c.Color
}
rectstyle := fmt.Sprintf("stroke:%s;stroke-width:1;fill:%s", boxcolor, boxcolor)
if len(c.Image) > 0 {
canvas.Image(x, y, w, h, c.Image)
if len(c.Name) > 0 {
canvas.Text(x+w2, y+h/3, c.Name,
fmt.Sprintf("font-size:%dpx;fill:%s;baseline-shift:50%%", fs, boxcolor))
}
return
}
if strings.HasPrefix(c.Shape, "#") {
uselibrary(x, y, w, h, c.Shape)
return
}
switch c.Shape {
case "mobile", "screen":
screen(x, y, w, h, 10, boxcolor, bgcolor)
canvas.Gstyle(fmt.Sprintf("font-size:%dpx", fs))
canvas.Text(x+w/2, y+h/3, c.Name)
if len(c.Os) > 0 {
canvas.Text(x+w/2, y+h3+fs+2, c.Os, "font-size:60%")
}
if len(c.Sw) > 0 {
canvas.Text(x+w/2, y+h3+fs*2, c.Sw, "font-size:75%")
}
canvas.Gend()
case "server":
server(x, y, w, h, 10, boxcolor, lcolor)
canvas.Text(x+w/2, y+h-10, c.Name, fmt.Sprintf("font-size:%dpx;fill:white", fs))
case "desktop":
l := h / 20
desktop(x, y, w, h, l, boxcolor, bgcolor)
canvas.Gstyle(fmt.Sprintf("font-size:%dpx", fs))
canvas.Text(x+w/2, y+h/3, c.Name)
if len(c.Os) > 0 {
canvas.Text(x+w/2, y+h3+fs+2, c.Os, "font-size:60%")
}
if len(c.Sw) > 0 {
canvas.Text(x+w/2, y+h3+fs*2, c.Sw, "font-size:75%")
}
canvas.Gend()
case "message":
l := h / 20
pmy := h / 8
message(x, y, w, h, l, lcolor, boxcolor)
canvas.Gstyle(fmt.Sprintf("font-size:%dpx;fill:white", fs))
if len(c.Os) > 0 {
canvas.Text(x+w2, y+pmy+fs, c.Os, "font-size:75%")
}
canvas.Text(x+w2, y+h-10, c.Name, fmt.Sprintf("font-size:%dpx;fill:%s", fs, bgcolor))
canvas.Gend()
case "cloud":
r := w / 3
xc := (x + w/2) + r/4
yc := y + h/2
cloud(xc, yc, r, boxcolor)
canvas.Text(xc-(r/4), yc+r/2, c.Name, fmt.Sprintf("font-size:%dpx;fill:white", fs))
case "db":
cylinder(x, y+(h/4), w, h-(h/2), h/4, lcolor, boxcolor)
canvas.Text(x+w2, y+h3, c.Name, fmt.Sprintf("font-size:%dpx;fill:white", fs))
if len(c.Sw) > 0 {
canvas.Text(x+w2, y+2*h3, c.Sw, "font-size:75%")
}
case "folder":
l := w / 10
folder(x, y, w, h, l, boxcolor, lcolor)
yp := y + h/2
canvas.Gstyle(fmt.Sprintf("font-size:%dpx;fill:white", fs))
canvas.Text(x+w/2, yp, c.Name)
if len(c.Os) > 0 {
canvas.Text(x+w/2, yp+fs+2, c.Os, "font-size:60%")
}
if len(c.Sw) > 0 {
canvas.Text(x+w/2, yp+fs*2, c.Sw, "font-size:75%")
}
canvas.Gend()
case "face":
fr := (w / 4) - (fs / 2) // (h*3)/8
face(x+w/2, y+h/2, fr, linesize, boxcolor, bgcolor)
canvas.Text(x+w/2, y+(h/2)+fr+15, c.Name, fmt.Sprintf("font-size:%dpx;fill:black", fs))
case "role":
role(x, y, w, h, boxcolor)
canvas.Text(x+w/2, y+h-5, c.Name, fmt.Sprintf("font-size:%dpx;fill:%s", fs, bgcolor))
case "eaec":
l := w / 10
eaec(x, y, w, h, l, boxcolor, bgcolor)
canvas.Text(x+w/2, y+h-5, c.Name, fmt.Sprintf("font-size:%dpx;fill:%s", fs, bgcolor))
case "plain":
if roundbox {
canvas.Roundrect(x, y, w, h, fs2, fs2, rectstyle)
} else {
canvas.Rect(x, y, w, h, rectstyle)
}
canvas.Text(x+w2, y+(h/2), c.Name, fmt.Sprintf("font-size:%dpx;fill:white;baseline-shift:-25%%", fs))
default:
canvas.Rect(x, y, w, h3, rectstyle)
canvas.Rect(x, y+h3, w, h-h3, "fill:white;stroke-width:1;stroke:gray")
canvas.Gstyle(fmt.Sprintf("font-size:%dpx", fs))
canvas.Text(x+w2, y+h3, c.Name, "fill:white;baseline-shift:50%")
canvas.Text(x+w2, y+h3+fs2, c.Os, "font-size:60%")
wordstack(x+w2, (y+h)-fs2, fs, strings.Split(c.Sw, `\n`), "fill-opacity:0.75;font-size:75%")
canvas.Gend()
}
}
// uselibrary draws a previously defined object
func uselibrary(x, y, w, h int, name string) {
canvas.Use(x, y, name, fmt.Sprintf(`width="%d"`, w), fmt.Sprintf(`height="%d"`, h))
}
// Object functions
func cylinder(x, y, w, h, eh int, fill, tfill string) {
f := "fill:" + fill
tf := "fill:" + tfill
canvas.Rect(x, y, w, h, f)
canvas.Ellipse(x+w/2, y+h, w/2, eh, f)
canvas.Ellipse(x+w/2, y, w/2, eh, tf)
}
// folder object
func folder(x, y, w, h, l int, bcolor, color string) {
nl := w / 10
xl := x + nl
xw := x + w
yl := y + nl
yh := y + h
l2 := nl * 2
l3 := nl * 3
lh := nl / 2
var (
xn = []int{xl, xl + l2, xl + l3, xw, xw, xl}
yn = []int{y, y, y + lh, y + lh, yh, yh}
xf = []int{xw, xw - l, x, x + l}
yf = []int{yh, yl + lh, yl + lh, yh}
)
canvas.Polygon(xn, yn, "fill:"+color)
canvas.Polygon(xf, yf, "fill:"+bcolor)
}
// cloud object
func cloud(x, y, r int, style string) {
small := r / 2
medium := (r * 6) / 10
canvas.Gstyle("fill:" + style)
canvas.Circle(x, y, r)
canvas.Circle(x+r, y+small, small)
canvas.Circle(x-r-small, y+small, small)
canvas.Circle(x-r, y, medium)
canvas.Rect(x-r-small, y, r*2+small, r)
canvas.Gend()
}
// message object
func message(x, y, w, h, l int, bcolor, scolor string) {
et := h / 3
w2 := w / 2
px := w / 8
py := h / 8
e1x := []int{x, x, x + w, x + w, x + w2, x}
e1y := []int{y + et, y + h, y + h, y + et, y + (et * 2), y + et}
e2x := []int{x, x + w2, x + w, x + w2, x}
e2y := []int{y + et, y, y + et, y + (et * 2), y + et}
canvas.Polygon(e2x, e2y, "fill:"+bcolor)
canvas.Polygon(e1x, e1y, "fill:"+scolor)
canvas.Roundrect(x+px, y+py, w-(px*2), h-py, l, l, "fill:"+scolor)
canvas.Line(x, y+et, x+w2, y+(et*2), "stroke-width:1;stroke:"+bcolor)
canvas.Line(x+w, y+et, x+w2, y+(et*2), "stroke-width:1;stroke:"+bcolor)
}
// eaec person object
func eaec(x, y, w, h, l int, scolor, bcolor string) {
wu := w / 8
hu := h / 12
wh := w / 2
hh := h / 2
sx := []int{x + wu*2, x + wu*6, x + wh}
sy := []int{y + hu*6, y + hu*6, y + hu*11}
tx := []int{x + wh, x + wh + wu, x + wh, x + wh - wu, x + wh}
ty := []int{y + hu*6, y + hu*7, y + hu*10, y + hu*7, y + hu*6}
canvas.Ellipse(x+wh, y+hu*4, wu+wu/2, hu*2, "fill:"+bcolor)
canvas.Roundrect(x+wu, y+hh, w-wu*2, hu*6, l, l, "fill:"+bcolor)
canvas.Polygon(sx, sy, "fill:"+scolor)
canvas.Polygon(tx, ty, "fill:"+bcolor)
}
// screen object
func screen(x, y, w, h, l int, bcolor, color string) {
canvas.Roundrect(x, y, w, h, l, l, "fill:"+bcolor)
canvas.Rect(x+l, y+l, w-(l*2), h-(l*2), "fill:"+color)
}
// kb (keyboard) object
func kb(x, y, w, h, l int, color string) {
var xp = []int{x + l, x, x + w, x + w - l}
var yp = []int{y, y + h, y + h, y}
canvas.Polygon(xp, yp, "fill:"+color)
}
// desktop object
func desktop(x, y, w, h, l int, bcolor, color string) {
screen(x, y, w, h-l*3, l, bcolor, color)
kb(x, y+h-(l*2), w+l, l*2, l*2, bcolor)
}
// face object
func face(x, y, r, l int, color, fcolor string) {
fu := r / 10 // "face unit"
ep := 3 * fu
my := y + ep
canvas.Circle(x, y, r, fmt.Sprintf("fill:%s;stroke-width:%dpx;stroke:%s", fcolor, l, color))
canvas.Circle(x+ep, y-ep, r/10, "fill:"+color)
canvas.Circle(x-ep, y-ep, r/10, "fill:"+color)
canvas.Qbez(x+ep, my, x, y+ep*2, x-ep, my, fmt.Sprintf("fill:%s;stroke-width:%dpx;stroke:%s", color, l, color))
}
// server object
func server(x, y, w, h, l int, bcolor, color string) {
var xp = []int{x + (l * 2), (x + w) - (l * 2), (x + w) - l, x + l}
var yp = []int{y, y, y + l, y + l}
canvas.Polygon(xp, yp, "fill:"+color)
canvas.Roundrect(x, y+l, w, h-l, 5, 5, "fill:"+bcolor)
canvas.Gstyle("stroke:" + color)
yl := y + (l / 2) + h/4
spacing := w / 5
for r := 0; r < 2; r++ {
xl := x + l
for c := 0; c < 2; c++ {
canvas.Line(xl, yl, xl+spacing, yl)
xl += spacing + 10
}
yl += h / 4
}
canvas.Gend()
canvas.Circle((x+w)-l, y+h/2, l/2, "fill:"+color)
}
// role object
func role(x, y, w, h int, color string) {
hs := h / 20
var xp = []int{x, x, x + w/3, x + w/2, x + (w / 2) + (w / 6), x + w, x + w}
var yp = []int{y + h, y + (16 * hs), y + (12 * hs), y + (14 * hs), y + (12 * hs), y + (16 * hs), y + h}
// var xp = []int{x, x, x + w/2, x + w, x + w}
// var yp = []int{y + h, y + (h5 * 4), y + (h5 * 2), y + (h5 * 4), y + h}
canvas.Gstyle("fill:" + color)
canvas.Polygon(xp, yp)
canvas.Ellipse(x+w/2, (y + h/3), w/5, h/3) // "stroke:white;stroke-width:2")
canvas.Gend()
}
// sloper computes the slope and r of a line
func sloper(x1, y1, x2, y2 int) (m, r float64) {
dy := float64(y1 - y2)
dx := float64(x1 - x2)
m = dy / dx
r = math.Atan2(dy, dx) * (180 / math.Pi)
return m, r
}
// rowy computes the y position of a row
func rowy(n, h, g, t int) int { return t + (n * g) + (n * h) }
// colx computes the x position of a column
func colx(n, w, g, l int) int { return l + (n * g) + (n * w) }
// compass returns the coordinates of a compass point
func compass(g gcomp, point string) (cx, cy int, dir string) {
switch point {
case "nw":
cx, cy, dir = g.x, g.y, "r"
case "nnw":
cx, cy, dir = g.x+g.w/4, g.y, "d"
case "nne":
cx, cy, dir = (g.x+g.w)-(g.w/4), g.y, "d"
case "n":
cx, cy, dir = g.x+(g.w/2), g.y, "d"
case "ne":
cx, cy, dir = g.x+g.w, g.y, "l"
case "w":
cx, cy, dir = g.x, g.y+g.h/2, "r"
case "wnw":
cx, cy, dir = g.x, g.y+g.h/4, "r"
case "wsw":
cx, cy, dir = g.x, (g.y+g.h)-(g.h/4), "r"
case "ese":
cx, cy, dir = g.x+g.w, (g.y+g.h)-(g.h/4), "l"
case "ene":
cx, cy, dir = g.x+g.w, g.y+(g.h/4), "l"
case "c":
cx, cy, dir = g.x+(g.w/2), g.y+(g.h/2), "n"
case "e":
cx, cy, dir = g.x+g.w, g.y+(g.h/2), "l"
case "sw":
cx, cy, dir = g.x, g.y+g.h, "r"
case "ssw":
cx, cy, dir = g.x+(g.w/4), g.y+g.h, "u"
case "sse":
cx, cy, dir = (g.x+g.w)-(g.w/4), g.y+g.h, "u"
case "s":
cx, cy, dir = g.x+(g.w/2), g.y+g.h, "u"
case "se":
cx, cy, dir = g.x+g.w, g.y+g.h, "l"
}
return cx, cy, dir
}
// connect two components
func connect(c1 gcomp, p1 string, c2 gcomp, p2 string, label string, mark string, dir string, color string) {
x1, y1, d1 := compass(c1, p1)
x2, y2, d2 := compass(c2, p2)
linelabel(x1, y1, x2, y2, label, mark, d1, d2, dir, color)
}
// linestyle returns the style for lines
func linestyle(color string) string {
return fmt.Sprintf(linefmt, color)
}
// linelabel determines the connection and arrow geometry
func linelabel(x1, y1, x2, y2 int, label string, mark string, d1 string, d2 string, dir string, color string) {
aw := linesize * 4
ah := linesize * 3
if len(color) == 0 {
color = lcolor
}
switch mark {
case "b":
lx1, ly1 := arrow(x1, y1, aw, ah, d1, color)
lx2, ly2 := arrow(x2, y2, aw, ah, d2, color)
doline(lx1, ly1, lx2, ly2, linestyle(color), dir, label)
case "s":
lx1, ly1 := arrow(x1, y1, aw, ah, d1, color)
doline(lx1, ly1, x2, y2, linestyle(color), dir, label)
case "d":
lx2, ly2 := arrow(x2, y2, aw, ah, d2, color)
doline(x1, y1, lx2, ly2, linestyle(color), dir, label)
default:
doline(x1, y1, x2, y2, linestyle(color), dir, label)
}
}
// doline draws a line between to coordinates
func doline(x1, y1, x2, y2 int, style, direction, label string) {
var labelstyle string
var upflag bool
if italiclabel {
labelstyle = "font-style:italic;"
}
tadjust := 6
mx := (x2 - x1) / 2
my := (y2 - y1) / 2
lx := x1 + mx
ly := y1 + my
m, _ := sloper(x1, y1, x2, y2)
hline := m == 0
vline := m == math.Inf(-1) || m == math.Inf(1)
straight := hline || vline
switch {
case m < 0: // upwards line
upflag = true
labelstyle += "text-anchor:end;"
lx -= tadjust
case hline: // horizontal line
labelstyle += "text-anchor:middle;baseline-shift:20%;"
ly -= tadjust
case m > 0: // downwards line
upflag = false
labelstyle += "text-anchor:start;"
lx += tadjust
}
if arc && !straight {
cx, cy := x1, y2 // initial control points
// fmt.Fprintf(os.Stderr, "%s slope = %.3f\n", label, m)
if upflag {
if direction == "ccw" {
cx, cy = x2, y1
} else {
cx, cy = x1, y2
}
} else {
if direction == "ccw" {
cx, cy = x1, y2
} else {
cx, cy = x2, y1
}
}
canvas.Qbez(x1, y1, cx, cy, x2, y2, style)
labelstyle += "text-anchor:middle"
canvas.Text(lx, ly, label, labelstyle)
} else {
canvas.Line(x1, y1, x2, y2, style)
canvas.Text(lx, ly, label, labelstyle) // midpoint
}
}
// wordstack displays text in a left-justified stack
func wordstack(x, y, fs int, s []string, style ...string) {
ls := fs + 2
for i := len(s); i > 0; i-- {
canvas.Text(x, y, s[i-1], style...)
y -= ls
}
}
// arrow constructs line-ending arrows according to connecting points
func arrow(x, y, w, h int, dir string, color string) (xl, yl int) {
var xp = []int{x, x, x, x}
var yp = []int{y, y, y, y}
n := notchsize
switch dir {
case "r":
xp[1] = x - w
yp[1] = y - h/2
xp[2] = (x - w) + n
yp[2] = y
xp[3] = x - w
yp[3] = y + h/2
xl, yl = xp[2], y
case "l":
xp[1] = x + w
yp[1] = y - h/2
xp[2] = (x + w) - n
yp[2] = y
xp[3] = x + w
yp[3] = y + h/2
xl, yl = xp[2], y
case "u":
xp[1] = x - w/2
yp[1] = y + h
xp[2] = x
yp[2] = (y + h) - n
xp[3] = x + w/2
yp[3] = y + h
xl, yl = x, yp[2]
case "d":
xp[1] = x - w/2
yp[1] = y - h
xp[2] = x
yp[2] = (y - h) + n
xp[3] = x + w/2
yp[3] = y - h
xl, yl = x, yp[2]
}
canvas.Polygon(xp, yp, "fill:"+color+";fill-opacity:"+lopacity)
return xl, yl
}
// init processes command line arguments
func init() {
flag.IntVar(&width, "w", 1024, "width")
flag.IntVar(&height, "h", 768, "height")
flag.IntVar(&linesize, "l", 4, "line weight")
flag.IntVar(&labelfs, "lf", 16, "label font size (px)")
flag.IntVar(&fontscale, "f", 10, "font scaling factor")
flag.IntVar(¬chsize, "n", 0, "arrow notch size")
flag.IntVar(&groupmargin, "gm", 10, "group margin")
flag.StringVar(&bgcolor, "bg", "white", "background color")
flag.StringVar(&title, "t", "comp grid", "title")
flag.BoolVar(&italiclabel, "il", false, "italic labels")
flag.BoolVar(&showtitle, "showtitle", false, "Show the title")
flag.BoolVar(&showtimestamp, "time", false, "Show a timestamp")
flag.BoolVar(&roundbox, "roundbox", false, "make boxes round")
flag.BoolVar(&arc, "arc", false, "use arcs to connect")
flag.StringVar(&guide, "g", "", "grid guide: WxHxRxC")
flag.Parse()
}
// for every file (or stdin) make a component diagram
func main() {
canvas.Start(width, height)
canvas.Title(title)
background(bgcolor)
canvas.Gstyle(fmt.Sprintf(globalstyle, labelfs, linesize, lopacity))
if len(flag.Args()) == 0 {
docomp("")
} else {
for _, f := range flag.Args() {
docomp(f)
}
}
canvas.Gend()
canvas.End()
}