/
gif_spark.go
85 lines (66 loc) · 1.35 KB
/
gif_spark.go
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package GIFSpark
import (
"image/color"
"image/gif"
"os"
)
type GIFSpark struct {
Values []int64
Palette []color.Color
Gif gif.GIF
}
func NewGIFSpark() *GIFSpark {
v := []int64{}
p := []color.Color{}
g := new(gif.GIF)
return &GIFSpark{v, p, g}
}
func (gs *GIFSpark) AddValue(value int64) {
gs.Values = append(gs.Values, value)
}
func (gs *GIFSpark) SaveGIf(filename string) error {
err := gs.MakeGif()
if err != nil {
return err
}
file, err := os.Create("output.gif")
if err != nil {
return err
}
err = gif.EncodeAll(file, gs.Gif)
if err != nil {
return err
}
}
func (gs *GIFSpark) MakeGif() error {
g := new(gif.GIF)
for l := 0; l <= 100; l++ {
frame := gs.makeFrame(l)
g.Image = append(g.Image, frame)
g.Delay = append(g.Delay, 0)
}
return
}
func (gs *GIFSpark) makeFrame(liney int) *image.Paletted {
r := image.Rect(0, 0, 500, 100)
frame := image.NewPaletted(r, gs.Palette())
frame.Set(0, 0, color.White)
for x := 0; x <= 500; x++ {
top := liney + 1
for y := liney; y <= top; y++ {
frame.Set(x, y, g3)
frame.Set(x, y+1, g5)
frame.Set(x, y+2, g7)
}
}
return frame
}
func (gs *GIFSpark) Palette() color.Palette {
if len(gs.Palette) == 0 {
g7 := color.Gray16{0x7777}
g5 := color.Gray16{0x9999}
g3 := color.Gray16{0xbbbb}
gs.Palette = []color.Color{color.White, g3, g5, g7}
}
return gs.Palette
}