Added decay waveform generation example

example_decay_test.go

@@ -0,0 +1,32 @@
+package texture_test
+
+import (
+	"fmt"
+	"github.com/jphsd/graphics2d/image"
+	"github.com/jphsd/texture"
+)
+
+func Example_decay() {
+	// Original waveform
+	nl := texture.NewNLSin()
+	w := texture.NewNLWave([]float64{62}, []*texture.NonLinear{nl}, true, false)
+	w1 := texture.NewInvertWave(w)
+	f := texture.NewLinearGradient(w1)
+
+	// Decay factor
+	nl2 := texture.NewNLLinear()
+	w2 := texture.NewNLWave([]float64{600}, []*texture.NonLinear{nl2}, false, false)
+	w3 := texture.NewInvertWave(w2)
+	f2 := texture.NewLinearGradient(w3)
+
+	// Remap [-1,1] => [0,1]
+	f4 := texture.NewOffsScaleFilter(f2, 0.5, 1)
+
+	// Combine waves to get decay waveform
+	f3 := texture.NewMulCombiner(f, f4)
+
+	img := texture.NewTextureGray16(600, 600, f3, 0, 0, 1, 1, false)
+	image.SaveImage(img, "Example_decay")
+	fmt.Printf("Generated Example_decay")
+	// Output: Generated Example_decay
+}