automated snapshot

field.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	rl "github.com/gen2brain/raylib-go/raylib"
 	"github.com/ojrac/opensimplex-go"
 )
 
@@ -13,14 +14,23 @@ type Field interface {
 
 // TRANSFORM FIELDS
 type ScaleField struct {
-	Scale float32
 	Field Field
+	Scale float32
 }
 
 func (f *ScaleField) Get(x, y float32) float32 {
 	return f.Field.Get(x / f.Scale, y / f.Scale)
 }
 
+type TranslateField struct {
+	Field Field
+	x, y float32
+}
+
+func (f *TranslateField) Get(x, y float32) float32 {
+	return f.Field.Get(x + f.x, y + f.y)
+}
+
 // NOISE FIELDS
 
 type SimplexNoiseField struct {
@@ -31,3 +41,41 @@ func (f *SimplexNoiseField) Get(x, y float32) float32 {
 	return f.Noise.Eval2(x, y)
 }
 
+// IMAGE FIELDS
+
+type ImageField struct {
+	image *rl.Image
+	pixels ImagePixels
+}
+
+type ImagePixels struct {
+	w, h int
+	colors []rl.Color
+}
+
+func (p *ImagePixels) Get(x, y int) rl.Color {
+	if x < 0 || x >= p.w {
+		return rl.Black
+	}
+	if y < 0 || y >= p.h {
+		return rl.Black
+	}
+	return p.colors[x + y * p.w]
+}
+
+func NewImageField(path string) ImageField {
+	image := rl.LoadImage(path)
+	colors := rl.LoadImageColors(image)
+	pixels := ImagePixels {
+		w: int(image.Width),
+		h: int(image.Height),
+		colors: colors,
+	}
+	return ImageField { image: image, pixels: pixels }
+}
+
+func (f *ImageField) Get(x, y float32) float32 {
+	// todo : blend colors
+	c := f.pixels.Get(int(x), int(y))
+	return Brightness(c)
+}