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sprite.go
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/
sprite.go
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package main
import (
"fmt"
"image"
"image/color"
"image/jpeg"
"image/png"
"os"
"math"
"github.com/ncruces/zenity"
)
type Texture struct {
w, h float64
data [][]color.RGBA
}
func (t *Texture) GetColorAt(u, v float64) color.RGBA {
finalU := u - math.Floor(u)
finalV := v - math.Floor(v)
x := int(math.Round((t.w - 1) * finalU))
y := int((t.h - 1) - math.Round((t.h-1)*finalV))
return t.data[y][x]
}
func LoadTexture(filename string) *Texture {
image.RegisterFormat("png", "png", png.Decode, png.DecodeConfig)
image.RegisterFormat("jpeg", "jpg", jpeg.Decode, jpeg.DecodeConfig)
file, err := os.Open(filename)
if err != nil {
zenity.Error(fmt.Sprintf("Error loading the texture '%s'.\n%s", filename, err), zenity.Title("Texture load error"), zenity.ErrorIcon)
panic(err)
}
defer file.Close()
texture := Texture{}
img, _, err := image.Decode(file)
if err != nil {
zenity.Error(fmt.Sprintf("Error decoding the texture image.\n%s", err), zenity.Title("Texture load error"), zenity.ErrorIcon)
panic(err)
}
bounds := img.Bounds()
w, h := bounds.Max.X, bounds.Max.Y
texture.w = float64(w)
texture.h = float64(h)
for y := 0; y < h; y++ {
row := []color.RGBA{}
for x := 0; x < w; x++ {
r, g, b, a := img.At(x, y).RGBA()
r /= 257
g /= 257
b /= 257
a /= 257
row = append(row, color.RGBA{uint8(r), uint8(g), uint8(b), uint8(a)})
}
texture.data = append(texture.data, row)
}
return &texture
}