74 lines
1.4 KiB
Go
74 lines
1.4 KiB
Go
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package chess
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import (
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"fmt"
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"image"
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"image/color"
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"image/png"
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"os"
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"golang.org/x/image/draw"
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)
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type Piece struct {
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Name PieceName
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Color color.Color
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Image image.Image
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}
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type PieceName string
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const (
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Pawn PieceName = "p"
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Knight PieceName = "n"
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Bishop PieceName = "b"
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Rook PieceName = "r"
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Queen PieceName = "q"
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King PieceName = "k"
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)
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type Color color.Color
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var (
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Light Color = color.RGBA{240, 217, 181, 255}
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Dark Color = color.RGBA{181, 136, 99, 255}
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)
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func NewPiece(name PieceName, color Color) (*Piece, error) {
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var (
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colorSuffix string
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path string
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file *os.File
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img image.Image
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dst *image.RGBA
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err error
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)
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colorSuffix = "l"
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if color == Light {
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colorSuffix = "l"
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} else if color == Dark {
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colorSuffix = "d"
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} else {
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return nil, fmt.Errorf("invalid color: %v", color)
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}
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path = fmt.Sprintf("assets/1024px-Chess_%s%st45.svg.png", name, colorSuffix)
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if file, err = os.Open(path); err != nil {
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return nil, err
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}
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defer file.Close()
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if img, err = png.Decode(file); err != nil {
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return nil, err
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}
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// source image for each piece is 1024x1024 and board is 8x8
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// so we need to scale each piece down to 128x128 (1024/8)
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dst = image.NewRGBA(image.Rect(0, 0, 128, 128))
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draw.CatmullRom.Scale(dst, dst.Rect, img, img.Bounds(), draw.Over, nil)
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return &Piece{Name: name, Color: color, Image: dst}, nil
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}
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