Added visibility changing abilities for drawers.

src/cmd/test/main.go

@@ -29,6 +29,7 @@ func NewPlayer() *Player {
 				RA: gx.Vector{320, 240},
 			},
 			I: playerImg,
+			Visible: true,
 		},
 		MoveSpeed: 90.,
 		ScaleSpeed: .2,
@@ -110,6 +111,8 @@ func (d *Debug) Draw(
 	e.DebugPrint(i, strings.Join(keyStrs, ", "))
 }
 
+func (d *Debug) IsVisible() bool {return true}
+
 func main() {
 	e := gx.New(&gx.WindowConfig{
 		Title: "Test title",
@@ -127,16 +130,19 @@ func main() {
 
 	e.Add(0, NewPlayer())
 	e.Add(1, &Debug{})
-	e.Add(-1, gx.Rectangle{
-		W: 100,
-		H: 100,
-		T: gx.T(),
-		C: gx.Color{
-			gx.MaxColorV,
-			gx.MaxColorV,
+	e.Add(-1, gx.DrawableRectangle{
+		Rectangle: gx.Rectangle{
+			W: 100,
+			H: 100,
+			T: gx.T(),
+		},
+		Color: gx.Color{
 			gx.MaxColorV,
+			0,
+			0,
 			gx.MaxColorV,
 		},
+		Visible: true,
 	})
 	e.Run()
 }

src/gx/img.go

@@ -20,6 +20,7 @@ type Color struct {
 // the layers order.
 type Drawer interface {
 	Draw(*Engine, *Image)
+	IsVisible() bool
 }
 
 const (

src/gx/main.go

@@ -149,6 +149,9 @@ func (e *engine) Draw(i *ebiten.Image) {
 	eng := (*Engine)(e)
 	for p := range e.layers.Vals() {
 		for pj := range p.V.Range() {
+			if !pj.V.IsVisible() {
+				continue
+			}
 			pj.V.Draw(eng, i)
 		}
 	}

src/gx/rect.go

@@ -3,7 +3,7 @@ package gx
 import (
 	"github.com/hajimehoshi/ebiten/v2"
 	//"github.com/hajimehoshi/ebiten/v2/vector"
-	"fmt"
+	//"fmt"
 	//"image"
 )
 
@@ -18,8 +18,15 @@ type Rectangle struct {
 	// relation of width and height.
 	// Change transform to actually change things.
 	W, H Float
-	S *Shader
-	C Color
+	
+}
+
+// The type describes rectangle that can be drawn.
+type DrawableRectangle struct {
+	Rectangle
+	Shader *Shader
+	Color Color
+	Visible bool
 }
 
 // Return points of corners of the rectangle.
@@ -45,14 +52,18 @@ func NewImage(w, h int) (*Image) {
 	return ebiten.NewImage(w, h)
 }
 
-func (r Rectangle) Draw(
+func (r DrawableRectangle) IsVisible() bool {
+	return r.Visible
+}
+
+func (r DrawableRectangle) Draw(
 	e *Engine,
 	i *Image,
 ) {
-	fmt.Println("drawing the rectangle:", r)
-	if r.S == nil {
+	// Draw solid color if no shader.
+	if r.Shader == nil {
 		img := NewImage(1, 1)
-		img.Set(0, 0, r.C)
+		img.Set(0, 0, r.Color)
 		
 		t := r.T
 		t.S.X *= r.W
@@ -65,13 +76,13 @@ func (r Rectangle) Draw(
 			GeoM: m,
 		}
 		i.DrawImage(img, opts)
-		fmt.Println("done")
 		return
 	}
+	
 	opts := &ebiten.DrawRectShaderOptions{
 		GeoM: r.T.Matrix(e),
 		Images: [4]*Image{
-			NewImage(1000, 1000),
+			NewImage(1, 1),
 			nil,
 			nil,
 			nil,
@@ -81,6 +92,6 @@ func (r Rectangle) Draw(
 	//w := int(r.W * r.T.S.X)
 	//h := int(r.H * r.T.S.Y)
 	
-	i.DrawRectShader(1000, 1000, r.S, opts)
+	i.DrawRectShader(1000, 1000, r.Shader, opts)
 }
 

src/gx/shader.go

@@ -9,11 +9,11 @@ type Shader = ebiten.Shader
 
 var (
 	// The shader does not 
-	SolidColorShader = MustNewShader([]byte(`
+	SolidWhiteColorShader = MustNewShader([]byte(`
 		package main
 		
 		func Fragment(p vec4, coord vec2, color vec4) vec4 {
-			return vec4(1, 0, 1, 1)
+			return vec4(1, 1, 1, 1)
 		}
 	`))
 )

src/gx/sprite.go

@@ -8,7 +8,7 @@ type Sprite struct {
 	I *Image
 	T Transform
 	S *Shader
-	Floating bool
+	Floating, Visible bool
 }
 
 func (s *Sprite) Draw(
@@ -36,3 +36,7 @@ func (s *Sprite) Draw(
 	i.DrawImage(s.I, op)
 }
 
+func (s *Sprite) IsVisible() bool {
+	return s.Visible
+}
+