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infolabel.go
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/
infolabel.go
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package main
import (
"fmt"
"image"
"image/color"
"image/draw"
"strings"
"sync"
"time"
"golang.org/x/image/font"
"golang.org/x/image/font/basicfont"
"golang.org/x/image/math/fixed"
)
// InfoLabel with built-in marquee scroll
type InfoLabel struct {
text string
buffer []byte
maxlen int
active bool
graphic bool // image rather than text
yy int
height int
x int // scroll x
v int // scroll velocity (pix)
marquee chan bool
dur time.Duration
b image.Rectangle
r image.Rectangle
place image.Rectangle
pt image.Point
slice *image.RGBA
canvas *image.RGBA
color color.Color
face font.Face
fontHeight float64
mux sync.Mutex
}
// NewInfoLabel instatiates an info label
func NewInfoLabel(maxlen, velocity int, d time.Duration, graphical, start bool) *InfoLabel {
il := InfoLabel{
text: ``,
dur: d,
graphic: graphical,
active: false,
buffer: []byte(``),
v: velocity, //6,
slice: image.NewRGBA(image.Rect(0, 0, 1, 1)),
canvas: image.NewRGBA(image.Rect(0, 0, 1, 1)),
face: basicfont.Face7x13,
fontHeight: 13,
color: image.Black,
}
il.maxlen = maxlen
if start {
il.Start()
}
return &il
}
// Start the label marquee
func (il *InfoLabel) Start() {
if !il.active {
il.marquee = sched(il.Marquee, il.dur)
il.active = true
}
}
// Active if scrolling
func (il *InfoLabel) Active() bool {
return il.active
}
// SetFace defines font face
func (il *InfoLabel) SetFace(f font.Face, x string) {
t := il.text
gt := false
if il.face != f {
gt = true
il.face = f
fmx := il.face.Metrics()
il.yy = 2 + int(float64(fmx.Ascent>>6)-float64(fmx.Descent>>6))
il.fontHeight = float64((fmx.Height >> 6) + 2)
}
r, g, b, a := il.parseHexColor(x)
il.color = color.NRGBA{uint8(r), uint8(g), uint8(b), uint8(a)}
if gt {
il.text = ``
il.SetText(t)
}
}
// Stop the label marquee
func (il *InfoLabel) Stop() {
il.marquee <- true
il.active = false
}
func (il *InfoLabel) measureString(s string) float64 {
d := &font.Drawer{
Face: il.face,
}
adv := d.MeasureString(s)
return float64(adv >> 6)
}
func (il *InfoLabel) parseHexColor(x string) (r, g, b, a int) {
x = strings.TrimPrefix(x, "#")
a = 255
if len(x) == 3 {
format := "%1x%1x%1x"
fmt.Sscanf(x, format, &r, &g, &b)
r |= r << 4
g |= g << 4
b |= b << 4
}
if len(x) == 6 {
format := "%02x%02x%02x"
fmt.Sscanf(x, format, &r, &g, &b)
}
if len(x) == 8 {
format := "%02x%02x%02x%02x"
fmt.Sscanf(x, format, &r, &g, &b, &a)
}
return
}
// SetMaxlen allows for adjusting based on font metric - we should aoutomate
func (il *InfoLabel) SetMaxlen(m int) {
if il.maxlen != m {
il.mux.Lock()
il.maxlen = m
// reset buffer just in case
if m < len(il.text) {
t := il.text
il.text = ``
il.SetText(t)
}
il.mux.Unlock()
}
}
// GetText get label source text
func (il *InfoLabel) GetText() string {
return il.text
}
// SetText sets label source text
func (il *InfoLabel) SetText(t string) {
if il.text != t {
il.mux.Lock()
il.text = t
if !il.graphic {
il.buffer = []byte(` ` + t)
} else {
ww := int(il.measureString(` `))
w := int(il.measureString(t)) + (2 * ww)
il.canvas = image.NewRGBA(image.Rect(0, 0, w, int(il.fontHeight+2)))
il.b = il.canvas.Bounds()
il.r = il.b
il.r.Max.X = il.v
il.place = image.Rect(il.b.Max.X-il.v, 0, il.b.Max.X, il.b.Max.Y)
il.slice = image.NewRGBA(il.r)
il.pt = image.Pt(il.v, 0)
mx := il.face.Metrics()
yy := 2 + int(float64(mx.Ascent>>6)-float64(mx.Descent>>6))
point := fixed.Point26_6{fixed.Int26_6(ww * 64), fixed.Int26_6(yy * 64)}
d := &font.Drawer{
Dst: il.canvas,
Src: image.NewUniform(il.color),
Face: il.face,
Dot: point,
}
d.DrawString(t)
}
il.mux.Unlock()
}
}
// Marquee scrolls text by manipulating text buffer (rotates)
func (il *InfoLabel) Marquee() {
if !il.graphic {
if len(il.text) > il.maxlen {
il.buffer = append(il.buffer[1:], il.buffer[0:1]...)
}
} else {
if len(il.text) > il.maxlen {
draw.Draw(il.slice, il.r, il.canvas, il.r.Min, draw.Src)
draw.Draw(il.canvas, il.b, il.canvas, il.b.Min.Add(il.pt), draw.Src)
draw.Draw(il.canvas, il.place, il.slice, il.r.Min, draw.Src)
}
}
}
// Image returns current canvas graphic-mode
func (il *InfoLabel) Image() *image.RGBA {
return il.canvas
}
// Display gets the current marquee text-mode
func (il *InfoLabel) Display() string {
return string(il.buffer)
}