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assets.go
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assets.go
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package assets
import (
"embed"
"encoding/xml"
"image"
_ "image/png"
"io/fs"
"log"
"math/rand"
"github.com/hajimehoshi/ebiten/v2"
"golang.org/x/image/font"
"golang.org/x/image/font/opentype"
)
//go:embed spritesheet/*
var assets embed.FS
const (
spriteSheet = "spritesheet/allSprites_default.png"
xmlSpriteMap = "spritesheet/allSprites_default.xml"
)
type Assets struct {
SpriteSheet *ebiten.Image
SpriteSheetXMLMap SpriteMap
}
type SubTexture struct {
XMLName xml.Name `xml:"SubTexture"`
Name string `xml:"name,attr"`
X int `xml:"x,attr"`
Y int `xml:"y,attr"`
Width int `xml:"width,attr"`
Height int `xml:"height,attr"`
}
type SpriteMap struct {
XMLName xml.Name `xml:"TextureAtlas"`
ImagePath string `xml:"imagePath,attr"`
SubTextures []SubTexture `xml:"SubTexture"`
}
func NewAssets() *Assets {
var spriteSheet = mustLoadImage(spriteSheet)
var spriteMap = mustLoadXMLSpriteMap(xmlSpriteMap)
return &Assets{
SpriteSheet: spriteSheet,
SpriteSheetXMLMap: spriteMap,
}
}
func (a *Assets) GetSprite(name string) *ebiten.Image {
for i := 0; i < len(a.SpriteSheetXMLMap.SubTextures); i++ {
subTexture := a.SpriteSheetXMLMap.SubTextures[i]
if subTexture.Name == name {
return a.SpriteSheet.SubImage(
image.Rect(
subTexture.X,
subTexture.Y,
subTexture.X+subTexture.Width,
subTexture.Y+subTexture.Height,
)).(*ebiten.Image)
}
}
return nil
}
func (a *Assets) GetRandomTankBody() *ebiten.Image {
bodies := []string{"tankBody_bigRed.png", "tankBody_bigRed_outline.png", "tankBody_blue.png", "tankBody_blue_outline.png", "tankBody_dark.png", "tankBody_darkLarge.png", "tankBody_darkLarge_outline.png", "tankBody_dark_outline.png", "tankBody_green.png", "tankBody_green_outline.png", "tankBody_huge.png", "tankBody_huge_outline.png", "tankBody_red.png", "tankBody_red_outline.png", "tankBody_sand.png", "tankBody_sand_outline.png", "tank_bigRed.png", "tank_blue.png", "tank_dark.png", "tank_darkLarge.png", "tank_green.png", "tank_huge.png", "tank_red.png", "tank_sand.png"}
name := bodies[rand.Intn(len(bodies))]
log.Printf("new tank body: %s\n", name)
return a.GetSprite(name)
}
func (a *Assets) GetRandomTankBarrell() *ebiten.Image {
barrels := []string{"tankDark_barrel1.png", "tankDark_barrel1_outline.png", "tankDark_barrel2.png", "tankDark_barrel2_outline.png", "tankDark_barrel3.png", "tankDark_barrel3_outline.png", "tankGreen_barrel1.png", "tankGreen_barrel1_outline.png", "tankGreen_barrel2.png", "tankGreen_barrel2_outline.png", "tankGreen_barrel3.png", "tankGreen_barrel3_outline.png", "tankRed_barrel1.png", "tankRed_barrel1_outline.png", "tankRed_barrel2.png", "tankRed_barrel2_outline.png", "tankRed_barrel3.png", "tankRed_barrel3_outline.png", "tankSand_barrel1.png", "tankSand_barrel1_outline.png", "tankSand_barrel2.png", "tankSand_barrel2_outline.png", "tankSand_barrel3.png", "tankSand_barrel3_outline.png"}
name := barrels[rand.Intn(len(barrels))]
log.Printf("new tank barrell: %s\n", name)
return a.GetSprite(name)
}
func mustLoadImage(name string) *ebiten.Image {
dat, err := assets.Open(name)
if err != nil {
panic(err)
}
img, _, err := image.Decode(dat)
if err != nil {
panic(err)
}
return ebiten.NewImageFromImage(img)
}
func mustLoadFont(name string) font.Face {
f, err := assets.ReadFile(name)
if err != nil {
panic(err)
}
tt, err := opentype.Parse(f)
if err != nil {
panic(err)
}
face, err := opentype.NewFace(tt, &opentype.FaceOptions{
Size: 48,
DPI: 72,
Hinting: font.HintingVertical,
})
if err != nil {
panic(err)
}
return face
}
func mustLoadXMLSpriteMap(name string) SpriteMap {
byteValue, _ := fs.ReadFile(assets, name)
var s SpriteMap
if err := xml.Unmarshal(byteValue, &s); err != nil {
panic(err)
}
// fmt.Println(s)
return s
}