updated example

Author: aldernero

controls.go

@@ -10,10 +10,10 @@ import (
 )
 
 const (
-	sliderHeight              = 10.0
-	sliderHPadding            = 5.0
-	sliderVPadding            = 2.0
-	sliderMouseWheelThreshold = 0.5
+	SliderHeight              = 10.0
+	SliderHPadding            = 5.0
+	SliderVPadding            = 2.0
+	SliderMouseWheelThreshold = 0.5
 )
 
 var sliderOutline color.Color = color.Black
@@ -36,10 +36,10 @@ func (s *Slider) GetPercentage() float64 {
 }
 
 func (s *Slider) GetRect(ctx *gg.Context) Rect {
-	x := s.Pos.X - sliderHPadding
-	y := s.Pos.Y - sliderVPadding - ctx.FontHeight()
-	w := s.Width + 2*sliderHPadding
-	h := s.Height + ctx.FontHeight() + sliderVPadding
+	x := s.Pos.X - SliderHPadding
+	y := s.Pos.Y - SliderVPadding - ctx.FontHeight()
+	w := s.Width + 2*SliderHPadding
+	h := s.Height + ctx.FontHeight() + SliderVPadding
 	return Rect{X: x, Y: y, W: w, H: h}
 }
 
@@ -49,7 +49,7 @@ func (s *Slider) AutoHeight(ctx *gg.Context) {
 
 func (s *Slider) IsInside(x float64, y float64) bool {
 	return x >= s.Pos.X &&
-		x <= s.Pos.X+s.Width && y >= s.Pos.Y && y <= s.Pos.Y+sliderHeight
+		x <= s.Pos.X+s.Width && y >= s.Pos.Y && y <= s.Pos.Y+SliderHeight
 }
 
 func (s *Slider) Update(x float64) {
@@ -67,7 +67,7 @@ func (s *Slider) CheckAndUpdate() error {
 	} else {
 		if s.IsInside(float64(x), float64(y)) {
 			_, dy := ebiten.Wheel()
-			if math.Abs(dy) > sliderMouseWheelThreshold {
+			if math.Abs(dy) > SliderMouseWheelThreshold {
 				if dy < 0 {
 					s.Val -= s.Incr
 				} else {
@@ -82,22 +82,22 @@ func (s *Slider) CheckAndUpdate() error {
 
 func (s *Slider) Draw(ctx *gg.Context) {
 	ctx.SetColor(sliderBackground)
-	ctx.DrawRectangle(s.Pos.X, s.Pos.Y, s.Width, sliderHeight)
+	ctx.DrawRectangle(s.Pos.X, s.Pos.Y, s.Width, SliderHeight)
 	ctx.Fill()
 	ctx.SetColor(sliderFill)
-	ctx.DrawRectangle(s.Pos.X, s.Pos.Y, s.Width*s.GetPercentage(), sliderHeight)
+	ctx.DrawRectangle(s.Pos.X, s.Pos.Y, s.Width*s.GetPercentage(), SliderHeight)
 	ctx.Fill()
 	ctx.SetColor(sliderOutline)
-	ctx.DrawRectangle(s.Pos.X, s.Pos.Y, s.Width, sliderHeight)
+	ctx.DrawRectangle(s.Pos.X, s.Pos.Y, s.Width, SliderHeight)
 	ctx.Stroke()
 	digits := 0
 	if s.Incr < 1 {
 		digits = int(math.Ceil(math.Abs(math.Log10(s.Incr))))
 	}
-	ctx.DrawStringWrapped(s.Name, s.Pos.X, s.Pos.Y-ctx.FontHeight()-sliderVPadding, 0, 0, s.Width, 1, gg.AlignLeft)
+	ctx.DrawStringWrapped(s.Name, s.Pos.X, s.Pos.Y-ctx.FontHeight()-SliderVPadding, 0, 0, s.Width, 1, gg.AlignLeft)
 	ctx.DrawStringWrapped(
 		strconv.FormatFloat(s.Val, 'f', digits, 64),
-		s.Pos.X, s.Pos.Y-ctx.FontHeight()-sliderVPadding,
+		s.Pos.X, s.Pos.Y-ctx.FontHeight()-SliderVPadding,
 		0, 0, s.Width, 1, gg.AlignRight)
 }
 

example/config.json

@@ -0,0 +1,28 @@
+{
+    "SketchWidth": 1080,
+    "SketchHeight": 1080,
+    "ControlWidth": 200,
+    "Controls": [
+        {
+            "Name": "slider1",
+            "MinVal": 0,
+            "MaxVal": 100,
+            "Val": 25,
+            "Incr": 1
+        },
+        {
+            "Name": "slider2",
+            "MinVal": 0,
+            "MaxVal": 360,
+            "Val": 180,
+            "Incr": 1
+        },
+        {
+            "Name": "slider3",
+            "MinVal": 0,
+            "MaxVal": 1,
+            "Val": 0.3,
+            "Incr": 0.01
+        }
+    ]
+}

example/main.go

@@ -4,6 +4,7 @@ import (
 	"log"
 
 	"github.com/aldernero/sketchy"
+	"github.com/fogleman/gg"
 	"github.com/hajimehoshi/ebiten/v2"
 )
 
@@ -12,6 +13,8 @@ func main() {
 	if err != nil {
 		log.Fatal(err)
 	}
+	ctx := gg.NewContext(int(s.ControlWidth), int(s.SketchHeight))
+	s.PlaceControls(s.ControlWidth, s.SketchHeight, ctx)
 	ebiten.SetWindowSize(int(s.ControlWidth+s.SketchWidth), int(s.SketchHeight))
 	ebiten.SetWindowTitle("Sketchy Sketch")
 	ebiten.SetWindowResizable(false)

sketch.go

@@ -17,7 +17,7 @@ type Sketch struct {
 	Controls     []Slider
 }
 
-func NewSketchFromFile(fname string) (Sketch, error) {
+func NewSketchFromFile(fname string) (*Sketch, error) {
 	jsonFile, err := os.Open(fname)
 	if err != nil {
 		log.Fatal(err)
@@ -27,29 +27,29 @@ func NewSketchFromFile(fname string) (Sketch, error) {
 	if err = parser.Decode(&sketch); err != nil {
 		log.Fatal(err)
 	}
-	return sketch, nil
+	return &sketch, nil
 }
 
 func (s *Sketch) UpdateControls() {
-	for _, c := range s.Controls {
-		c.CheckAndUpdate()
+	for i := range s.Controls {
+		s.Controls[i].CheckAndUpdate()
 	}
 }
 
 func (s *Sketch) PlaceControls(w float64, h float64, ctx *gg.Context) {
-	for i, c := range s.Controls {
-		c.AutoHeight(ctx)
-		c.Width = s.ControlWidth - 2*sliderHPadding
-		c.Pos = Point{
-			X: sliderHPadding,
-			Y: 2*float64(i)*c.Height + c.Height,
+	for i := range s.Controls {
+		s.Controls[i].AutoHeight(ctx)
+		s.Controls[i].Width = s.ControlWidth - 2*SliderHPadding
+		s.Controls[i].Pos = Point{
+			X: SliderHPadding,
+			Y: 2*float64(i)*s.Controls[i].Height + s.Controls[i].Height,
 		}
 	}
 }
 
 func (s *Sketch) DrawControls(ctx *gg.Context) {
-	for _, c := range s.Controls {
-		c.Draw(ctx)
+	for i := range s.Controls {
+		s.Controls[i].Draw(ctx)
 	}
 }
 
@@ -71,5 +71,6 @@ func (s *Sketch) Draw(screen *ebiten.Image) {
 	cc.SetColor(color.White)
 	cc.Fill()
 	s.DrawControls(cc)
+	screen.DrawImage(ebiten.NewImageFromImage(cc.Image()), nil)
 	// Custom draw code goes here
 }