// NewImage returns a new image canvas
// that draws to the given image. The
// minimum point of the given image
// should probably be 0,0.
func NewImage(img draw.Image, name string) (*Canvas, error) {
w := float64(img.Bounds().Max.X - img.Bounds().Min.X)
h := float64(img.Bounds().Max.Y - img.Bounds().Min.Y)
X, err := xgbutil.NewConn()
if err != nil {
return nil, err
}
keybind.Initialize(X)
ximg := xgraphics.New(X, image.Rect(0, 0, int(w), int(h)))
err = ximg.CreatePixmap()
if err != nil {
return nil, err
}
painter := NewPainter(ximg)
gc := draw2dimg.NewGraphicContextWithPainter(ximg, painter)
gc.SetDPI(dpi)
gc.Scale(1, -1)
gc.Translate(0, -h)
wid := ximg.XShowExtra(name, true)
go func() {
xevent.Main(X)
}()
c := &Canvas{
Canvas: vgimg.NewWith(vgimg.UseImageWithContext(img, gc)),
x: X,
ximg: ximg,
wid: wid,
}
vg.Initialize(c)
return c, nil
}
func genTwitterGif(tweets []anaconda.Tweet, username string, tid int64) (string, error) {
wid := 440
height := 220
colList := color.Palette{
color.RGBA{0x00, 0x00, 0x00, 0xFF},
color.RGBA{0xFF, 0x33, 0x33, 0xFF},
color.RGBA{0x33, 0xFF, 0x33, 0xFF},
color.RGBA{0x33, 0x33, 0xFF, 0xFF},
color.RGBA{0xFF, 0xFF, 0x33, 0xFF},
color.RGBA{0xFF, 0x33, 0xFF, 0xFF},
color.RGBA{0x33, 0xFF, 0xFF, 0xFF},
}
newList := []*image.Paletted{}
delayList := []int{}
fireworkList := []FireWork{}
disposalList := []byte{}
draw2d.SetFontFolder("static")
for i := range tweets {
f := genFireworkFromTweet(tweets, i, float64(wid), float64(height))
fireworkList = append(fireworkList, f)
}
boundRect := image.Rect(0, 0, wid, height)
for len(fireworkList) > 0 {
rawImg := image.NewRGBA(boundRect)
// TODO :: Create Custom Painter
// which does blend up
painter := raster.NewRGBAPainter(rawImg)
gc := draw2dimg.NewGraphicContextWithPainter(rawImg, painter)
gc.SetFontData(draw2d.FontData{
Name: "Roboto",
})
gc.SetFontSize(8)
gc.Clear()
gc.SetFillColor(colList[0])
gc.MoveTo(0, 0)
gc.LineTo(0, float64(height))
gc.LineTo(float64(wid), float64(height))
gc.LineTo(float64(wid), 0)
gc.Close()
gc.Fill()
newFList := []FireWork{}
for _, f := range fireworkList {
if f.d > 0 {
f.d -= 1.0
} else {
gc.SetFillColor(colList[f.colID])
gc.SetStrokeColor(colList[f.colID])
gc.MoveTo(f.x, f.y)
gc.FillStringAt(f.text, f.x-4, f.y+4)
gc.MoveTo(f.x, f.y)
gc.SetLineWidth(f.sz)
gc.LineTo(f.x-f.dx, f.y-f.dy)
for ns := 1.0; ns < f.sz; ns += 1.0 {
gc.SetLineWidth(f.sz - ns)
gc.LineTo(f.x-f.dx*ns*0.2, f.y-f.dy*ns*0.2)
}
gc.Stroke()
f.x += f.dx
f.y += f.dy
f.t -= 1.0
f.dy += 0.3
}
if f.t > 0 {
newFList = append(newFList, f)
} else if len(f.bundle) > 0 {
for _, subF := range f.bundle {
subF.x += f.x
subF.y += f.y
newFList = append(newFList, subF)
}
}
}
fireworkList = newFList
// Make Pallette Image
newImg := image.NewPaletted(boundRect, colList)
for x := 0; x < wid; x++ {
for y := 0; y < height; y++ {
newImg.SetColorIndex(x, y, uint8(colList.Index(rawImg.At(x, y))))
}
}
// Add Lists
if len(newList) == 0 {
disposalList = append(disposalList, gif.DisposalNone)
} else {
disposalList = append(disposalList, gif.DisposalPrevious)
}
newList = append(newList, newImg)
delayList = append(delayList, 10)
}
log.Println("Saving gif with ", len(newList), " frames")
gifData := gif.GIF{
Image: newList,
Delay: delayList,
Disposal: disposalList,
LoopCount: -1,
BackgroundIndex: 0,
Config: image.Config{
ColorModel: colList,
Width: wid,
Height: height,
},
}
fn := MakeGifFilename(username, tid)
f, e := os.Create(fn)
if e != nil {
log.Println(e)
return "", e
}
e = gif.EncodeAll(f, &gifData)
if e != nil {
log.Println(e)
return "", e
}
return fn, nil
}