107 lines
1.9 KiB
Go
107 lines
1.9 KiB
Go
package letter
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import (
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"embed"
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"encoding/csv"
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"image"
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"image/color"
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"image/draw"
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"io"
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"git.niplace.ru/XoxJlopeZi4BB/imageutils"
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)
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type Letter string
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//go:embed map.csv
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var fs embed.FS
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var mapFile = func() io.Reader {
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f, err := fs.Open("map.csv")
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if err != nil {
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panic(err)
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}
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return f
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}()
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var Letters = func(r io.Reader) (m map[string]string) {
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records, err := csv.NewReader(r).ReadAll()
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if err != nil {
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panic(err)
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}
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for _, v := range records {
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if len(v) < 2 {
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panic("csv file isn's key-value pair")
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}
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m[v[0]] = v[1]
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}
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return m
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}(mapFile)
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// implements image.Image interface.
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func (l Letter) ColorModel() color.Model {
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return color.Alpha16Model
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}
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// implements image.Image interface.
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func (l Letter) Bounds() image.Rectangle {
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return image.Rect(0, 0, 3, 3)
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}
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// implements image.Image interface.
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func (l Letter) At(x, y int) color.Color {
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if len(l) != 9 {
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panic("len(Letter) != 9")
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}
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target := l[x+y*3]
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if target != '1' {
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return color.Opaque
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}
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return color.Transparent
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}
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func Render(l Letter) image.Image {
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img := image.NewRGBA(l.Bounds())
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draw.Draw(img, l.Bounds(), image.White, image.ZP, draw.Src)
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draw.Draw(img, l.Bounds(), l, image.ZP, draw.Over)
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return img
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}
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type blank struct {
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image.Image
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color.Color
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imageutils.Side
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}
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func (b blank) ColorModel() color.Model { return b.Image.ColorModel() }
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func (b blank) Bounds() image.Rectangle {
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rect := image.Rectangle{}
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switch b.Side {
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case imageutils.Left:
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fallthrough
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case imageutils.Right:
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rect = image.Rectangle{
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image.ZP,
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image.Point{
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1, b.Image.Bounds().Dy(),
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},
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}
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case imageutils.Up:
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fallthrough
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case imageutils.Down:
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rect = image.Rectangle{
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image.ZP,
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image.Point{
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b.Image.Bounds().Dx(), 1,
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},
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}
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}
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return rect
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}
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func (b blank) At(x, y int) color.Color { return b.Color }
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func Blank(img image.Image, clr color.Color, side imageutils.Side) image.Image {
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return imageutils.Concat(img, blank{img, clr, side}, side)
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}
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