feat: create a gif

1 files changed, 25 insertions, 3 deletions

diff --git a/main.go b/main.go
index 45362f8..7e652eb 100644
--- a/main.go
+++ b/main.go
@@ -1,9 +1,11 @@
 package main
 
 import (
-	"fmt"
+	"image"
 	"image/color"
+	"image/gif"
 	"io"
+	"math"
 	"math/rand/v2"
 	"os"
 )
@@ -13,6 +15,11 @@ var palette = []color.Color{
 	color.Black,
 }
 
+const (
+	whiteIndex = iota
+	blackIndex
+)
+
 func main() {
 	lissajous(os.Stdout)
 }
@@ -29,8 +36,23 @@ func lissajous(out io.Writer) {
 	// Note that this generates the exact same random number per
 	// run of the program.
 	freq := rand.Float64() * 3.0
+	anim := gif.GIF{LoopCount: nframes}
+	phase := 0.0
+
+	for range nframes {
+		rect := image.Rect(0, 0, 2*size+1, 2*size+1)
+		img := image.NewPaletted(rect, palette)
 
-	for range 10 {
-		fmt.Printf("random number: %.2f\n", freq)
+		for t := 0.0; t < cycles*2*math.Pi; t += res {
+			x := math.Sin(t)
+			y := math.Sin(t*freq + phase)
+			img.SetColorIndex(size+int(x*size+0.5), size+int(y*size+0.5), blackIndex)
+		}
+
+		phase += 0.1
+		anim.Delay = append(anim.Delay, delay)
+		anim.Image = append(anim.Image, img)
 	}
+
+	gif.EncodeAll(out, &anim)
 }