added scale_rotate example

Author: aldernero

README.md

@@ -1,6 +1,6 @@
 ![sketchy_logo_002](https://user-images.githubusercontent.com/96601789/154788295-49904170-fc0f-4de0-8e70-2c9093fdd6f1.png)
 
-Sketchy is a framework making generative art in Go. It is inspired by [vsketch](https://github.com/abey79/vsketch) and [openFrameworks](https://github.com/openframeworks/openFrameworks). It uses [gg](https://github.com/fogleman/gg) for drawing and the [ebiten](https://github.com/hajimehoshi/ebiten) game engine for the GUI. It's designed to provide controls (sliders) via simple JSON that can be used within a familiar `update()` and `draw()` framework to enable quick iteration on designs.
+Sketchy is a framework for making generative art in Go. It is inspired by [vsketch](https://github.com/abey79/vsketch) and [openFrameworks](https://github.com/openframeworks/openFrameworks). It uses [gg](https://github.com/fogleman/gg) for drawing and the [ebiten](https://github.com/hajimehoshi/ebiten) game engine for the GUI. It's designed to provide controls (sliders) via simple JSON that can be used within a familiar `update()` and `draw()` framework to enable quick iteration on designs.
 
 Sketchy is still very much in the alpha stage. Below is an example of what the framework looks like while running the "noise" example.
 

examples/lissajous/main.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"flag"
 	"image/color"
 	"log"
 
@@ -33,15 +34,23 @@ func draw(s *sketchy.Sketch, c *gg.Context) {
 }
 
 func main() {
-	s, err := sketchy.NewSketchFromFile("config.json")
-	s.Updater = update
-	s.Drawer = draw
+	var configFile string
+	var prefix string
+	var randomSeed int64
+	flag.StringVar(&configFile, "c", "sketch.json", "Sketch config file")
+	flag.StringVar(&prefix, "p", "sketch", "Output file prefix")
+	flag.Int64Var(&randomSeed, "s", 0, "Random number generator seed")
+	s, err := sketchy.NewSketchFromFile(configFile)
 	if err != nil {
 		log.Fatal(err)
 	}
+	s.Prefix = prefix
+	s.RandomSeed = randomSeed
+	s.Updater = update
+	s.Drawer = draw
 	s.Init()
 	ebiten.SetWindowSize(int(s.ControlWidth+s.SketchWidth), int(s.SketchHeight))
-	ebiten.SetWindowTitle(s.Title)
+	ebiten.SetWindowTitle("Sketchy - " + s.Title)
 	ebiten.SetWindowResizable(false)
 	if err := ebiten.RunGame(s); err != nil {
 		log.Fatal(err)

examples/lissajous/config.json renamed to examples/lissajous/sketch.json

@@ -2,7 +2,6 @@ package main
 
 import (
 	"flag"
-	"fmt"
 	"log"
 
 	"github.com/aldernero/sketchy"
@@ -11,7 +10,7 @@ import (
 	"github.com/lucasb-eyer/go-colorful"
 )
 
-var hasShownMinMax bool = false
+var tick int64
 
 func update(s *sketchy.Sketch) {
 	s.Rand.SetSeed(int64(s.Var("seed")))
@@ -22,40 +21,32 @@ func update(s *sketchy.Sketch) {
 	s.Rand.SetNoiseScaleY(s.Var("yscale"))
 	s.Rand.SetNoiseOffsetX(s.Var("xoffset"))
 	s.Rand.SetNoiseOffsetY(s.Var("yoffset"))
+	s.Rand.SetNoiseScaleZ(0.005)
+	s.Rand.SetNoiseOffsetZ(float64(tick))
+	tick++
 }
 
 func draw(s *sketchy.Sketch, c *gg.Context) {
 	cellSize := s.Var("cellSize")
-	minNoise := 100.0
-	maxNoise := -100.0
+	c.SetLineWidth(0)
 	for x := 0.0; x < s.SketchWidth; x += cellSize {
 		for y := 0.0; y < s.SketchHeight; y += cellSize {
-			noise := s.Rand.Noise2D(x, y)
-			if noise > maxNoise {
-				maxNoise = noise
-			}
-			if noise < minNoise {
-				minNoise = noise
-			}
-			hue := sketchy.Map(-1, 1, 0, 360, noise)
+			noise := s.Rand.Noise3D(x, y, 0)
+			hue := sketchy.Map(0, 1, 0, 360, noise)
 			cellColor := colorful.Hsl(hue, 0.5, 0.5)
 			c.SetColor(cellColor)
 			c.DrawRectangle(x, y, cellSize, cellSize)
 			c.Fill()
 		}
 	}
-	if !hasShownMinMax {
-		fmt.Println(minNoise, maxNoise)
-		hasShownMinMax = true
-	}
 }
 
 func main() {
 	var configFile string
 	var prefix string
 	var randomSeed int64
 	flag.StringVar(&configFile, "c", "sketch.json", "Sketch config file")
-	flag.StringVar(&configFile, "p", "sketch", "Output file prefix")
+	flag.StringVar(&prefix, "p", "sketch", "Output file prefix")
 	flag.Int64Var(&randomSeed, "s", 0, "Random number generator seed")
 	s, err := sketchy.NewSketchFromFile(configFile)
 	if err != nil {

examples/noise/main.go

@@ -0,0 +1,64 @@
+package main
+
+import (
+	"flag"
+	"image/color"
+	"log"
+	"math"
+
+	"github.com/aldernero/sketchy"
+	"github.com/fogleman/gg"
+	"github.com/hajimehoshi/ebiten/v2"
+)
+
+const radius = 300.0
+
+func update(s *sketchy.Sketch) {
+	// Update logic goes here
+	// Not needed for this example
+}
+
+func draw(s *sketchy.Sketch, c *gg.Context) {
+	// Drawing code goes here
+	N := int(s.Var("N"))
+	sides := int(s.Var("sides"))
+	rotate := sketchy.Deg2Rad(s.Var("rotate"))
+	scale := s.Var("scale")
+	c.SetColor(color.CMYK{
+		C: 200,
+		M: 0,
+		Y: 0,
+		K: 0,
+	})
+	for i := 0; i < N; i++ {
+		x := s.SketchWidth / 2
+		y := s.SketchHeight / 2
+		r := math.Pow(scale, float64(i)) * radius
+		c.DrawRegularPolygon(sides, x, y, r, float64(i)*rotate)
+		c.Stroke()
+	}
+}
+
+func main() {
+	var configFile string
+	var prefix string
+	var randomSeed int64
+	flag.StringVar(&configFile, "c", "sketch.json", "Sketch config file")
+	flag.StringVar(&prefix, "p", "sketch", "Output file prefix")
+	flag.Int64Var(&randomSeed, "s", 0, "Random number generator seed")
+	s, err := sketchy.NewSketchFromFile(configFile)
+	if err != nil {
+		log.Fatal(err)
+	}
+	s.Prefix = prefix
+	s.RandomSeed = randomSeed
+	s.Updater = update
+	s.Drawer = draw
+	s.Init()
+	ebiten.SetWindowSize(int(s.ControlWidth+s.SketchWidth), int(s.SketchHeight))
+	ebiten.SetWindowTitle("Sketchy - " + s.Title)
+	ebiten.SetWindowResizable(false)
+	if err := ebiten.RunGame(s); err != nil {
+		log.Fatal(err)
+	}
+}

examples/noise/config.json renamed to examples/noise/sketch.json

@@ -0,0 +1,37 @@
+{
+    "Title": "Scale & Rotate",
+    "Prefix": "scale_rotate",
+    "SketchWidth": 800,
+    "SketchHeight": 800,
+    "ControlWidth": 240,
+    "Controls": [
+        {
+            "Name": "N",
+            "MinVal": 1,
+            "MaxVal": 100,
+            "Val": 30,
+            "Incr": 1
+        },
+        {
+            "Name": "sides",
+            "MinVal": 1,
+            "MaxVal": 100,
+            "Val": 7,
+            "Incr": 1
+        },
+        {
+            "Name": "rotate",
+            "MinVal": -180,
+            "MaxVal": 180,
+            "Val": -60,
+            "Incr": 0.5
+        },
+        {
+            "Name": "scale",
+            "MinVal": 0,
+            "MaxVal": 1,
+            "Val": 0.9,
+            "Incr": 0.01
+        }
+    ]
+}