diff --git a/go.mod b/go.mod
index 414c084..d8f9472 100644
--- a/go.mod
+++ b/go.mod
@@ -3,15 +3,16 @@ module github.com/surdeus/gox
 go 1.20
 
 require (
-	github.com/ebitengine/purego v0.1.1 // indirect
+	github.com/ebitengine/purego v0.4.0-alpha.4 // indirect
 	github.com/go-gl/glfw/v3.3/glfw v0.0.0-20221017161538-93cebf72946b // indirect
-	github.com/hajimehoshi/ebiten/v2 v2.4.16 // indirect
+	github.com/hajimehoshi/ebiten/v2 v2.6.0-alpha.3.0.20230521122940-90562ee84b9b // indirect
 	github.com/hajimehoshi/file2byteslice v1.0.0 // indirect
 	github.com/jezek/xgb v1.1.0 // indirect
 	github.com/surdeus/godat v0.0.0-20230428145139-f51a8ab74bc8 // indirect
 	golang.org/x/exp v0.0.0-20230213192124-5e25df0256eb // indirect
-	golang.org/x/exp/shiny v0.0.0-20230213192124-5e25df0256eb // indirect
-	golang.org/x/image v0.5.0 // indirect
-	golang.org/x/mobile v0.0.0-20221110043201-43a038452099 // indirect
-	golang.org/x/sys v0.5.0 // indirect
+	golang.org/x/exp/shiny v0.0.0-20230522175609-2e198f4a06a1 // indirect
+	golang.org/x/image v0.7.0 // indirect
+	golang.org/x/mobile v0.0.0-20230427221453-e8d11dd0ba41 // indirect
+	golang.org/x/sync v0.2.0 // indirect
+	golang.org/x/sys v0.8.0 // indirect
 )
diff --git a/go.sum b/go.sum
index 0253366..0d34d57 100644
--- a/go.sum
+++ b/go.sum
@@ -2,12 +2,16 @@ github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802/go.mod h1:IVnqGOEym
 github.com/ebitengine/purego v0.0.0-20220905075623-aeed57cda744/go.mod h1:Eh8I3yvknDYZeCuXH9kRNaPuHEwvXDCk378o9xszmHg=
 github.com/ebitengine/purego v0.1.1 h1:HI8nW+LniW9Yb34k34jBs8nz+PNzsw68o7JF8jWFHHE=
 github.com/ebitengine/purego v0.1.1/go.mod h1:Eh8I3yvknDYZeCuXH9kRNaPuHEwvXDCk378o9xszmHg=
+github.com/ebitengine/purego v0.4.0-alpha.4 h1:Y7yIV06Yo5M2BAdD7EVPhfp6LZ0tEcQo5770OhYUVes=
+github.com/ebitengine/purego v0.4.0-alpha.4/go.mod h1:ah1In8AOtksoNK6yk5z1HTJeUkC1Ez4Wk2idgGslMwQ=
 github.com/go-gl/glfw/v3.3/glfw v0.0.0-20220806181222-55e207c401ad/go.mod h1:tQ2UAYgL5IevRw8kRxooKSPJfGvJ9fJQFa0TUsXzTg8=
 github.com/go-gl/glfw/v3.3/glfw v0.0.0-20221017161538-93cebf72946b h1:GgabKamyOYguHqHjSkDACcgoPIz3w0Dis/zJ1wyHHHU=
 github.com/go-gl/glfw/v3.3/glfw v0.0.0-20221017161538-93cebf72946b/go.mod h1:tQ2UAYgL5IevRw8kRxooKSPJfGvJ9fJQFa0TUsXzTg8=
 github.com/hajimehoshi/bitmapfont/v2 v2.2.2/go.mod h1:Ua/x9Dkz7M9CU4zr1VHWOqGwjKdXbOTRsH7lWfb1Co0=
 github.com/hajimehoshi/ebiten/v2 v2.4.16 h1:vhuMtaB78N2HlNMfImV/SZkDPNJhOxgFrEIm1uh838o=
 github.com/hajimehoshi/ebiten/v2 v2.4.16/go.mod h1:BZcqCU4XHmScUi+lsKexocWcf4offMFwfp8dVGIB/G4=
+github.com/hajimehoshi/ebiten/v2 v2.6.0-alpha.3.0.20230521122940-90562ee84b9b h1:QURPKDDBduvp9Zh5/4NeiPeUfpB4PokrfoH3tx4yNrg=
+github.com/hajimehoshi/ebiten/v2 v2.6.0-alpha.3.0.20230521122940-90562ee84b9b/go.mod h1:+fFI6Ag5YvbX1ivNQD2TxNhpWFDPuxEoew421TTQAxI=
 github.com/hajimehoshi/file2byteslice v0.0.0-20210813153925-5340248a8f41/go.mod h1:CqqAHp7Dk/AqQiwuhV1yT2334qbA/tFWQW0MD2dGqUE=
 github.com/hajimehoshi/file2byteslice v1.0.0 h1:ljd5KTennqyJ4vG9i/5jS8MD1prof97vlH5JOdtw3WU=
 github.com/hajimehoshi/file2byteslice v1.0.0/go.mod h1:CqqAHp7Dk/AqQiwuhV1yT2334qbA/tFWQW0MD2dGqUE=
@@ -40,28 +44,39 @@ golang.org/x/exp v0.0.0-20230213192124-5e25df0256eb h1:PaBZQdo+iSDyHT053FjUCgZQ/
 golang.org/x/exp v0.0.0-20230213192124-5e25df0256eb/go.mod h1:CxIveKay+FTh1D0yPZemJVgC/95VzuuOLq5Qi4xnoYc=
 golang.org/x/exp/shiny v0.0.0-20230213192124-5e25df0256eb h1:gdeQX7xJSkTNF+Sw7++XNIOo4pGL0CjQv3N2Vm1Erxk=
 golang.org/x/exp/shiny v0.0.0-20230213192124-5e25df0256eb/go.mod h1:UH99kUObWAZkDnWqppdQe5ZhPYESUw8I0zVV1uWBR+0=
+golang.org/x/exp/shiny v0.0.0-20230522175609-2e198f4a06a1 h1:NxHSRPlbeyFGDc6rU7YsvxV/4bXS9XhuvUt5pP63XUs=
+golang.org/x/exp/shiny v0.0.0-20230522175609-2e198f4a06a1/go.mod h1:UH99kUObWAZkDnWqppdQe5ZhPYESUw8I0zVV1uWBR+0=
 golang.org/x/image v0.0.0-20190227222117-0694c2d4d067/go.mod h1:kZ7UVZpmo3dzQBMxlp+ypCbDeSB+sBbTgSJuh5dn5js=
 golang.org/x/image v0.0.0-20190802002840-cff245a6509b/go.mod h1:FeLwcggjj3mMvU+oOTbSwawSJRM1uh48EjtB4UJZlP0=
 golang.org/x/image v0.1.0/go.mod h1:iyPr49SD/G/TBxYVB/9RRtGUT5eNbo2u4NamWeQcD5c=
 golang.org/x/image v0.5.0 h1:5JMiNunQeQw++mMOz48/ISeNu3Iweh/JaZU8ZLqHRrI=
 golang.org/x/image v0.5.0/go.mod h1:FVC7BI/5Ym8R25iw5OLsgshdUBbT1h5jZTpA+mvAdZ4=
+golang.org/x/image v0.7.0 h1:gzS29xtG1J5ybQlv0PuyfE3nmc6R4qB73m6LUUmvFuw=
+golang.org/x/image v0.7.0/go.mod h1:nd/q4ef1AKKYl/4kft7g+6UyGbdiqWqTP1ZAbRoV7Rg=
 golang.org/x/mobile v0.0.0-20190312151609-d3739f865fa6/go.mod h1:z+o9i4GpDbdi3rU15maQ/Ox0txvL9dWGYEHz965HBQE=
 golang.org/x/mobile v0.0.0-20190415191353-3e0bab5405d6/go.mod h1:E/iHnbuqvinMTCcRqshq8CkpyQDoeVncDDYHnLhea+o=
 golang.org/x/mobile v0.0.0-20220722155234-aaac322e2105/go.mod h1:pe2sM7Uk+2Su1y7u/6Z8KJ24D7lepUjFZbhFOrmDfuQ=
 golang.org/x/mobile v0.0.0-20221110043201-43a038452099 h1:aIu0lKmfdgtn2uTj7JI2oN4TUrQvgB+wzTPO23bCKt8=
 golang.org/x/mobile v0.0.0-20221110043201-43a038452099/go.mod h1:aAjjkJNdrh3PMckS4B10TGS2nag27cbKR1y2BpUxsiY=
+golang.org/x/mobile v0.0.0-20230427221453-e8d11dd0ba41 h1:539vykMVJsmdiucRtMmdeLLZaTVhWhaAHFcPabj2lws=
+golang.org/x/mobile v0.0.0-20230427221453-e8d11dd0ba41/go.mod h1:aAjjkJNdrh3PMckS4B10TGS2nag27cbKR1y2BpUxsiY=
 golang.org/x/mod v0.1.0/go.mod h1:0QHyrYULN0/3qlju5TqG8bIK38QM8yzMo5ekMj3DlcY=
 golang.org/x/mod v0.4.2/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
 golang.org/x/mod v0.6.0-dev.0.20220419223038-86c51ed26bb4/go.mod h1:jJ57K6gSWd91VN4djpZkiMVwK6gcyfeH4XE8wZrZaV4=
+golang.org/x/mod v0.8.0/go.mod h1:iBbtSCu2XBx23ZKBPSOrRkjjQPZFPuis4dIYUhu/chs=
 golang.org/x/net v0.0.0-20190311183353-d8887717615a/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
 golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
 golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/net v0.0.0-20210226172049-e18ecbb05110/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg=
 golang.org/x/net v0.0.0-20210805182204-aaa1db679c0d/go.mod h1:9nx3DQGgdP8bBQD5qxJ1jj9UTztislL4KSBs9R2vV5Y=
 golang.org/x/net v0.0.0-20220722155237-a158d28d115b/go.mod h1:XRhObCWvk6IyKnWLug+ECip1KBveYUHfp+8e9klMJ9c=
+golang.org/x/net v0.6.0/go.mod h1:2Tu9+aMcznHK/AK1HMvgo6xiTLG5rD5rZLDS+rp2Bjs=
 golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20210220032951-036812b2e83c/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20220722155255-886fb9371eb4/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sync v0.1.0/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sync v0.2.0 h1:PUR+T4wwASmuSTYdKjYHI5TD22Wy5ogLU5qZCOLxBrI=
+golang.org/x/sync v0.2.0/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190312061237-fead79001313/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
@@ -77,19 +92,24 @@ golang.org/x/sys v0.0.0-20220722155257-8c9f86f7a55f/go.mod h1:oPkhp1MJrh7nUepCBc
 golang.org/x/sys v0.0.0-20220818161305-2296e01440c6/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.5.0 h1:MUK/U/4lj1t1oPg0HfuXDN/Z1wv31ZJ/YcPiGccS4DU=
 golang.org/x/sys v0.5.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.8.0 h1:EBmGv8NaZBZTWvrbjNoL6HVt+IVy3QDQpJs7VRIw3tU=
+golang.org/x/sys v0.8.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
 golang.org/x/term v0.0.0-20210927222741-03fcf44c2211/go.mod h1:jbD1KX2456YbFQfuXm/mYQcufACuNUgVhRMnK/tPxf8=
+golang.org/x/term v0.5.0/go.mod h1:jMB1sMXY+tzblOD4FWmEbocvup2/aLOaQEp7JmGp78k=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
 golang.org/x/text v0.3.6/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
 golang.org/x/text v0.3.7/go.mod h1:u+2+/6zg+i71rQMx5EYifcz6MCKuco9NR6JIITiCfzQ=
 golang.org/x/text v0.4.0/go.mod h1:mrYo+phRRbMaCq/xk9113O4dZlRixOauAjOtrjsXDZ8=
 golang.org/x/text v0.7.0/go.mod h1:mrYo+phRRbMaCq/xk9113O4dZlRixOauAjOtrjsXDZ8=
+golang.org/x/text v0.9.0/go.mod h1:e1OnstbJyHTd6l/uOt8jFFHp6TRDWZR/bV3emEE/zU8=
 golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
 golang.org/x/tools v0.0.0-20190312151545-0bb0c0a6e846/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
 golang.org/x/tools v0.0.0-20191119224855-298f0cb1881e/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
 golang.org/x/tools v0.1.8-0.20211022200916-316ba0b74098/go.mod h1:LGqMHiF4EqQNHR1JncWGqT5BVaXmza+X+BDGol+dOxo=
 golang.org/x/tools v0.1.12/go.mod h1:hNGJHUnrk76NpqgfD5Aqm5Crs+Hm0VOH/i9J2+nxYbc=
+golang.org/x/tools v0.6.0/go.mod h1:Xwgl3UAJ/d3gWutnCtw505GrjyAbvKui8lOU390QaIU=
 golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
diff --git a/src/cmd/test/main.go b/src/cmd/test/main.go
index cfc932f..93b99a4 100644
--- a/src/cmd/test/main.go
+++ b/src/cmd/test/main.go
@@ -127,5 +127,16 @@ func main() {
 
 	e.Add(0, NewPlayer())
 	e.Add(1, &Debug{})
+	e.Add(100, gx.Rectangle{
+		W: 10000000,
+		H: 10000000,
+		T: gx.T(),
+		C: gx.Color{
+			gx.MaxColorV,
+			gx.MaxColorV,
+			gx.MaxColorV,
+			gx.MaxColorV,
+		},
+	})
 	e.Run()
 }
diff --git a/src/gx/circle.go b/src/gx/circle.go
index 8a6f43f..8918435 100644
--- a/src/gx/circle.go
+++ b/src/gx/circle.go
@@ -1,14 +1,15 @@
 package gx
 
+// The structure represents any circles.
 type Circle struct {
-	// Position
+	// Position.
 	P Point
-	// Radius
+	// Radius.
 	R Float
 }
 
-func (c Circle) ColliderSimplify() Rect {
-	return Rect{
+func (c Circle) ColliderSimplify() Rectangle {
+	return Rectangle{
 		W: c.R * 2,
 		H: c.R * 2,
 	}
diff --git a/src/gx/collider.go b/src/gx/collider.go
index 216e2aa..c4c05fb 100644
--- a/src/gx/collider.go
+++ b/src/gx/collider.go
@@ -7,19 +7,19 @@ package gx
 // contain more complicated structure
 // do collide.
 type ColliderSimplifier interface {
-	ColliderSimplify() Rect
+	ColliderSimplify() Triangle
 }
 
 // The structure represents all
-// information on collision.
+// information on collisions.
 type Collision struct {
-	Other Collider
+	Current, With any
 }
 
-// Every collider has to implement
-// collision with every other type of collider
-// for optimization. Not good for custom colliders
-// but is fast.
+// Implementing the interface lets the engine
+// to determine if the object collides with anything.
+// Mostly will use the Collide function with some
+// inner structure field as first argument.
 type Collider interface {
 	Collides(Collider) *Collision
 }
@@ -30,3 +30,16 @@ type CollideEventer interface {
 	Collide(*Collision)
 }
 
+// Single function for all collision to remove 
+// functionality duplicating from the archtecture.
+// Returns the collision if there is and nil if there
+// is no collision.
+/*func Collide(c1, c2 any) bool {
+}
+
+func triangleCollidesPoint(t Triangle, p Point) *Collision {
+}
+
+func triangleCollidesTriangle(t1, t2 Triangle) *Collision
+*/
+
diff --git a/src/gx/img.go b/src/gx/img.go
index 1e4b3c4..c4e7ca5 100644
--- a/src/gx/img.go
+++ b/src/gx/img.go
@@ -5,9 +5,15 @@ import (
 	"image"
 	_ "image/png"
 	"io"
+	"math"
 )
 
+type ColorV uint32
 type Image = ebiten.Image
+type ColorM = ebiten.ColorM
+type Color struct {
+	R, G, B, A ColorV
+}
 
 // The interface describes anything that can be
 // drawn. It will be drew corresponding to
@@ -16,6 +22,10 @@ type Drawer interface {
 	Draw(*Engine, *Image)
 }
 
+const (
+	MaxColorV = math.MaxUint32
+)
+
 func LoadImage(input io.Reader) (*Image, error) {
 	img, _, err := image.Decode(input)
 	if err != nil {
@@ -26,3 +36,7 @@ func LoadImage(input io.Reader) (*Image, error) {
 	return ret, nil
 }
 
+func (c Color) RGBA() (r, g, b, a uint32) {
+	return uint32(c.R), uint32(c.G), uint32(c.B), uint32(c.A)
+}
+
diff --git a/src/gx/line-segment.go b/src/gx/line-segment.go
index 1da91f8..9a764c2 100644
--- a/src/gx/line-segment.go
+++ b/src/gx/line-segment.go
@@ -1,7 +1,4 @@
 package gx
 
-type LineSegment struct {
-	P Point
-	V Vector
-}
+type LineSegment [2]Point
 
diff --git a/src/gx/main.go b/src/gx/main.go
index bb3093c..ab27673 100644
--- a/src/gx/main.go
+++ b/src/gx/main.go
@@ -7,6 +7,7 @@ import (
 	"github.com/surdeus/godat/src/poolx"
 	//"fmt"
 	"time"
+	"math"
 )
 
 // The type is used in all Engine interactions
@@ -37,6 +38,10 @@ type Engine struct {
 
 type engine Engine
 
+var (
+	Infinity = math.MaxFloat64
+)
+
 // Return current camera.
 func (e *Engine) Camera() *Camera {
 	return e.camera
@@ -76,12 +81,12 @@ func New(
 func (e *Engine) Add(l Layer, b any) {
 	beh, ok := b.(Behaver)
 	if ok {
-		e.AddBehaver(beh)
+		e.addBehaver(beh)
 	}
 
 	drw, ok := b.(Drawer)
 	if ok {
-		e.AddDrawer(l, drw)
+		e.addDrawer(l, drw)
 	}
 }
 
@@ -101,7 +106,7 @@ func (e *Engine) Del(b any) {
 	
 }
 
-func (e *Engine) AddDrawer(l Layer, d Drawer) {
+func (e *Engine) addDrawer(l Layer, d Drawer) {
 	g, ok := e.layers.Get(l)
 	if !ok {
 		layer := poolx.New[Drawer]()
@@ -116,7 +121,7 @@ func (e *Engine) AddDrawer(l Layer, d Drawer) {
 
 }
 
-func (e *Engine) AddBehaver(b Behaver) {
+func (e *Engine) addBehaver(b Behaver) {
 	e.behavers.Append(b)
 	b.Start(e)
 }
diff --git a/src/gx/rect.go b/src/gx/rect.go
index dcd9901..5f5b6be 100644
--- a/src/gx/rect.go
+++ b/src/gx/rect.go
@@ -1,16 +1,84 @@
 package gx
 
+import (
+	"github.com/hajimehoshi/ebiten/v2"
+	//"github.com/hajimehoshi/ebiten/v2/vector"
+	"fmt"
+	//"image"
+)
+
 // The type describes rectangle geometry.
-type Rect struct {
-	// Position and rotate around.
-	P, RA Point
+type Rectangle struct {
+	// Position of up left corner
+	// and the point to
+	// rotate around(relatively of position, not absolute).
+	T Transform
 	// Width and height.
+	// In fact are needed only to specify
+	// relation of width and height.
+	// Change transform to actually change things.
 	W, H Float
-	// Rotation in radians.
-	R Float
+	S *Shader
+	C Color
 }
 
-func (r Rect) ColliderSimplify() Rect {
-	return r
+// Return points of corners of the rectangle.
+func (r Rectangle) Corners() []Point {
+	return []Point{}
+}
+
+// Get 2 triangles that the rectangle consists of.
+func (r Rectangle) Triangles() Triangles {
+	return Triangles{}
+}
+
+/*func MustNewImage(w, h int) (*Image) {
+	img, err := NewImage(w, h)
+	if err != nil {
+		panic(err)
+	}
+	
+	return img
+}*/
+
+func NewImage(w, h int) (*Image) {
+	return ebiten.NewImage(w, h)
+}
+
+func (r Rectangle) Draw(
+	e *Engine,
+	i *Image,
+) {
+	fmt.Println("drawing the rectangle")
+	if r.S == nil {
+		img := NewImage(1, 1)
+		img.Set(0, 0, r.C)
+		
+		t := r.T
+		t.S.X *= r.W
+		t.S.Y *= r.H
+		
+		m := t.Matrix(e)
+		opts := &ebiten.DrawImageOptions{
+			GeoM: m,
+		}
+		i.DrawImage(img, opts)
+		fmt.Println("done")
+		return
+	}
+	opts := &ebiten.DrawRectShaderOptions{
+		GeoM: r.T.Matrix(e),
+		Images: [4]*Image{
+			NewImage(1000, 1000),
+			nil,
+			nil,
+			nil,
+		},
+	}
+	
+	//w := int(r.W * r.T.S.X)
+	//h := int(r.H * r.T.S.Y)
+	
+	i.DrawRectShader(1000, 1000, r.S, opts)
 }
 
diff --git a/src/gx/shader.go b/src/gx/shader.go
new file mode 100644
index 0000000..5c7fb85
--- /dev/null
+++ b/src/gx/shader.go
@@ -0,0 +1,33 @@
+package gx
+
+import (
+	"github.com/hajimehoshi/ebiten/v2"
+	//"fmt"
+)
+
+type Shader = ebiten.Shader
+
+var (
+	// The shader does not 
+	SolidColorShader = MustNewShader([]byte(`
+		package main
+		
+		func Fragment(p vec4, coord vec2, color vec4) vec4 {
+			return vec4(1, 0, 1, 1)
+		}
+	`))
+)
+
+func MustNewShader(src []byte) (*Shader) {
+	shader, err := NewShader(src)
+	if err != nil {
+		panic(err)
+	}
+	
+	return shader
+}
+
+func NewShader(src []byte) (*Shader, error) {
+	return ebiten.NewShader(src)
+}
+
diff --git a/src/gx/sprite.go b/src/gx/sprite.go
index 4527fbb..344af1d 100644
--- a/src/gx/sprite.go
+++ b/src/gx/sprite.go
@@ -7,6 +7,7 @@ import (
 type Sprite struct {
 	I *Image
 	T Transform
+	S *Shader
 	Floating bool
 }
 
@@ -14,7 +15,9 @@ func (s *Sprite) Draw(
 	e *Engine,
 	i *Image,
 ) {
-	op := &ebiten.DrawImageOptions{}
+	op := &ebiten.DrawImageOptions{
+		
+	}
 	m := &Matrix{}
 
 	m.Concat(s.T.Matrix(e))
@@ -26,6 +29,10 @@ func (s *Sprite) Draw(
 	}
 
 	op.GeoM = *m
+	/*if s.S != nil {
+		bufImg := ebiten.NewImageFromImage(s.I)
+	} */
+	
 	i.DrawImage(s.I, op)
 }
 
diff --git a/src/gx/time.go b/src/gx/time.go
new file mode 100644
index 0000000..2b385f8
--- /dev/null
+++ b/src/gx/time.go
@@ -0,0 +1,9 @@
+package gx
+
+import (
+	"time"
+)
+
+type Time = time.Time
+type Duration = time.Duration
+
diff --git a/src/gx/triangle.go b/src/gx/triangle.go
index a3d374f..84c77bb 100644
--- a/src/gx/triangle.go
+++ b/src/gx/triangle.go
@@ -1,6 +1,24 @@
 package gx
 
-type Triangle struct {
-	Points [3]Point
+import (
+	"math"
+)
+
+// The structure of a triangle. What more you want to hear?
+type Triangle [3]Point
+type Triangles []Triangle
+
+// Returns the area of the triangle.
+func (t Triangle) Area() Float {
+	x1 := t[0].X
+	y1 := t[0].Y
+	
+	x2 := t[1].X
+	y2 := t[1].Y
+	
+	x3 := t[2].X
+	y3 := t[2].Y
+	
+	return math.Abs( (x1*(y2-y3) + x2*(y3-y1) + x3*(y1-y2))/2)
 }