automated snapshot

field.go

@@ -14,21 +14,21 @@ type Field interface {
 
 // TRANSFORM FIELDS
 type ScaleField struct {
-	Field Field
-	Scale float32
+	field Field
+	scale float32
 }
 
 func (f *ScaleField) Get(x, y float32) float32 {
-	return f.Field.Get(x / f.Scale, y / f.Scale)
+	return f.field.Get(x / f.scale, y / f.scale)
 }
 
 type TranslateField struct {
-	Field Field
+	field Field
 	x, y float32
 }
 
 func (f *TranslateField) Get(x, y float32) float32 {
-	return f.Field.Get(x + f.x, y + f.y)
+	return f.field.Get(x + f.x, y + f.y)
 }
 
 // NOISE FIELDS
@@ -46,6 +46,7 @@ func (f *SimplexNoiseField) Get(x, y float32) float32 {
 type ImageField struct {
 	image *rl.Image
 	pixels ImagePixels
+	offsetX, offsetY float32
 }
 
 type ImagePixels struct {
@@ -71,11 +72,18 @@ func NewImageField(path string) ImageField {
 		h: int(image.Height),
 		colors: colors,
 	}
-	return ImageField { image: image, pixels: pixels }
+	offsetX := float32(image.Width / 2)
+	offsetY := float32(image.Height / 2)
+	return ImageField {
+		image: image,
+		pixels: pixels,
+		offsetX: offsetX,
+		offsetY: offsetY,
+	}
 }
 
 func (f *ImageField) Get(x, y float32) float32 {
 	// todo : blend colors
-	c := f.pixels.Get(int(x), int(y))
+	c := f.pixels.Get(int(x+f.offsetX), int(y + f.offsetY))
 	return Brightness(c)
 }