Show a piece

example/blocks/field.go

@@ -0,0 +1,23 @@
+package blocks
+
+import (
+	"github.com/hajimehoshi/go-ebiten/graphics"
+	"github.com/hajimehoshi/go-ebiten/graphics/matrix"
+)
+
+type Field struct {
+	blocks [fieldBlockNumX][fieldBlockNumY]BlockType
+}
+
+func NewField() *Field {
+	return &Field{}
+}
+
+func (f *Field) Draw(context graphics.Context, geo matrix.Geometry) {
+	blocks := make([][]BlockType, len(f.blocks))
+	for i, blockLine := range f.blocks {
+		blocks[i] = make([]BlockType, len(blockLine))
+		copy(blocks[i], blockLine[:])
+	}
+	drawBlocks(context, blocks, geo)
+}

example/blocks/font.go

@@ -0,0 +1,54 @@
+package blocks
+
+import (
+	"github.com/hajimehoshi/go-ebiten/graphics"
+	"github.com/hajimehoshi/go-ebiten/graphics/matrix"
+	"image/color"
+)
+
+func init() {
+	texturePaths["font"] = "images/blocks/font.png"
+}
+
+const charWidth = 8
+const charHeight = 8
+
+func textWidth(str string) int {
+	return charWidth * len(str)
+}
+
+func drawText(context graphics.Context, str string, x, y, scale int, clr color.Color) {
+	fontTextureId := drawInfo.textures["font"]
+	parts := []graphics.TexturePart{}
+
+	locationX := 0
+	locationY := 0
+	for _, c := range str {
+		if c == '\n' {
+			locationX = 0
+			locationY += charHeight
+			continue
+		}
+		code := int(c)
+		x := (code % 16) * charWidth
+		y := ((code - 32) / 16) * charHeight
+		parts = append(parts, graphics.TexturePart{
+			LocationX: locationX,
+			LocationY: locationY,
+			Source:    graphics.Rect{x, y, charWidth, charHeight},
+		})
+		locationX += charWidth
+	}
+
+	geoMat := matrix.IdentityGeometry()
+	geoMat.Scale(float64(scale), float64(scale))
+	geoMat.Translate(float64(x), float64(y))
+	clrMat := matrix.IdentityColor()
+	clrMat.Scale(clr)
+	context.DrawTextureParts(fontTextureId, parts, geoMat, clrMat)
+}
+
+func drawTextWithShadow(context graphics.Context, str string, x, y, scale int, clr color.Color) {
+	drawText(context, str, x+1, y+1, scale, color.RGBA{0, 0, 0, 0x80})
+	drawText(context, str, x, y, scale, clr)
+}

example/blocks/game.go

@@ -1,7 +1,6 @@
 package blocks
 
 import (
-	"fmt"
 	"github.com/hajimehoshi/go-ebiten/graphics"
 	"github.com/hajimehoshi/go-ebiten/ui"
 	"image"
@@ -14,18 +13,13 @@ type Size struct {
 	Height int
 }
 
-var texturePaths = map[string]string{
-	"background": "images/blocks/background.png",
-	"font":       "images/blocks/font.png",
-}
-
-var renderTargetSizes = map[string]Size{
-	"whole": Size{256, 254},
-}
-
 const ScreenWidth = 256
 const ScreenHeight = 240
 
+var texturePaths = map[string]string{}
+var renderTargetSizes = map[string]Size{}
+
+// TODO: Make this not a global variable.
 var drawInfo = struct {
 	textures      map[string]graphics.TextureId
 	renderTargets map[string]graphics.RenderTargetId
@@ -34,8 +28,14 @@ var drawInfo = struct {
 	renderTargets: map[string]graphics.RenderTargetId{},
 }
 
+type GameState struct {
+	SceneManager *SceneManager
+	Input        *Input
+}
+
 type Game struct {
 	sceneManager *SceneManager
+	input        *Input
 }
 
 func loadImage(path string) (image.Image, error) {
@@ -77,6 +77,7 @@ func (game *Game) startLoadingTextures(textureFactory graphics.TextureFactory) {
 func NewGame(textureFactory graphics.TextureFactory) *Game {
 	game := &Game{
 		sceneManager: NewSceneManager(NewTitleScene()),
+		input:        NewInput(),
 	}
 	game.startLoadingTextures(textureFactory)
 	return game
@@ -95,7 +96,7 @@ func (game *Game) HandleEvent(e interface{}) {
 		}
 		drawInfo.renderTargets[e.Tag.(string)] = e.Id
 	case ui.KeyStateUpdatedEvent:
-		fmt.Printf("%v\n", e.Keys)
+		game.input.UpdateKeys(e.Keys)
 	case ui.MouseStateUpdatedEvent:
 	}
 }
@@ -114,7 +115,11 @@ func (game *Game) Update() {
 	if !game.isInitialized() {
 		return
 	}
-	game.sceneManager.Update()
+	game.input.Update()
+	game.sceneManager.Update(&GameState{
+		SceneManager: game.sceneManager,
+		Input:        game.input,
+	})
 }
 
 func (game *Game) Draw(context graphics.Context) {
@@ -123,36 +128,3 @@ func (game *Game) Draw(context graphics.Context) {
 	}
 	game.sceneManager.Draw(context)
 }
-
-/*func (game *Game) drawText(g graphics.Context, text string, x, y int, clr color.Color) {
-	const letterWidth = 6
-	const letterHeight = 16
-
-	parts := []graphics.TexturePart{}
-	textX := 0
-	textY := 0
-	for _, c := range text {
-		if c == '\n' {
-			textX = 0
-			textY += letterHeight
-			continue
-		}
-		code := int(c)
-		x := (code % 32) * letterWidth
-		y := (code / 32) * letterHeight
-		source := graphics.Rect{x, y, letterWidth, letterHeight}
-		parts = append(parts, graphics.TexturePart{
-			LocationX: textX,
-			LocationY: textY,
-			Source:    source,
-		})
-		textX += letterWidth
-	}
-
-	geometryMatrix := matrix.IdentityGeometry()
-	geometryMatrix.Translate(float64(x), float64(y))
-	colorMatrix := matrix.IdentityColor()
-	colorMatrix.Scale(clr)
-	g.DrawTextureParts(drawInfo.textures["text"], parts,
-		geometryMatrix, colorMatrix)
-}*/

example/blocks/game_scene.go

@@ -0,0 +1,66 @@
+package blocks
+
+import (
+	"github.com/hajimehoshi/go-ebiten/graphics"
+	"github.com/hajimehoshi/go-ebiten/graphics/matrix"
+	"image/color"
+	"math/rand"
+	"time"
+)
+
+func init() {
+	texturePaths["empty"] = "images/blocks/empty.png"
+}
+
+type GameScene struct {
+	field        *Field
+	rand         *rand.Rand
+	currentPiece *Piece
+	nextPiece    *Piece
+}
+
+func NewGameScene() *GameScene {
+	return &GameScene{
+		field: NewField(),
+		rand:  rand.New(rand.NewSource(time.Now().UnixNano())),
+	}
+}
+
+const emptyWidth = 16
+const emptyHeight = 16
+const fieldWidth = blockWidth * fieldBlockNumX
+const fieldHeight = blockHeight * fieldBlockNumY
+
+func (s *GameScene) choosePiece() *Piece {
+	// Omit BlockTypeNone.
+	num := int(BlockTypeMax) - 1
+	blockType := BlockType(s.rand.Intn(num) + 1)
+	return Pieces[blockType]
+}
+
+func (s *GameScene) Update(state *GameState) {
+	if s.currentPiece == nil {
+		s.currentPiece = s.choosePiece()
+	}
+}
+
+func (s *GameScene) Draw(context graphics.Context) {
+	context.Fill(0xff, 0xff, 0xff)
+
+	field := drawInfo.textures["empty"]
+	geoMat := matrix.IdentityGeometry()
+	geoMat.Scale(float64(fieldWidth) / float64(emptyWidth),
+		float64(fieldHeight) / float64(emptyHeight))
+	geoMat.Translate(20, 20) // magic number?
+	colorMat := matrix.IdentityColor()
+	colorMat.Scale(color.RGBA{0, 0, 0, 0x80})
+	context.DrawTexture(field, geoMat, colorMat)
+
+	geoMat = matrix.IdentityGeometry()
+	geoMat.Translate(20, 20)
+	s.field.Draw(context, geoMat)
+
+	if s.currentPiece != nil {
+		s.currentPiece.Draw(context, geoMat)
+	}
+}

example/blocks/input.go

@@ -0,0 +1,41 @@
+package blocks
+
+import (
+	"github.com/hajimehoshi/go-ebiten/ui"
+)
+
+type Input struct {
+	states          map[ui.Key]int
+	lastPressedKeys map[ui.Key]struct{}
+}
+
+func NewInput() *Input {
+	states := map[ui.Key]int{}
+	for key := ui.Key(0); key < ui.KeyMax; key++ {
+		states[key] = 0
+	}
+	return &Input{
+		states: states,
+	}
+}
+
+func (i *Input) StateForKey(key ui.Key) int {
+	return i.states[key]
+}
+
+func (i *Input) Update() {
+	for key, _ := range i.states {
+		if _, ok := i.lastPressedKeys[key]; !ok {
+			i.states[key] = 0
+			continue
+		}
+		i.states[key] += 1
+	}
+}
+
+func (i *Input) UpdateKeys(keys []ui.Key) {
+	i.lastPressedKeys = map[ui.Key]struct{}{}
+	for _, key := range keys {
+		i.lastPressedKeys[key] = struct{}{}
+	}
+}

example/blocks/piece.go

@@ -0,0 +1,141 @@
+package blocks
+
+import (
+	"github.com/hajimehoshi/go-ebiten/graphics"
+	"github.com/hajimehoshi/go-ebiten/graphics/matrix"
+)
+
+func init() {
+	texturePaths["blocks"] = "images/blocks/blocks.png"
+}
+
+type BlockType int
+
+const (
+	BlockTypeNone BlockType = iota
+	BlockType1
+	BlockType2
+	BlockType3
+	BlockType4
+	BlockType5
+	BlockType6
+	BlockType7
+	BlockTypeMax
+)
+
+type Piece struct {
+	blockType BlockType
+	blocks    [][]bool
+}
+
+func toBlocks(ints [][]int) [][]bool {
+	blocks := make([][]bool, len(ints))
+	for i, line := range ints {
+		blocks[i] = make([]bool, len(line))
+		for j, v := range line {
+			blocks[i][j] = v != 0
+		}
+	}
+	return blocks
+}
+
+var Pieces = map[BlockType]*Piece{
+	BlockTypeNone: nil,
+	BlockType1: &Piece{
+		blockType: BlockType1,
+		blocks: toBlocks([][]int{
+			{0, 1, 0, 0},
+			{0, 1, 0, 0},
+			{0, 1, 0, 0},
+			{0, 1, 0, 0},
+		}),
+	},
+	BlockType2: &Piece{
+		blockType: BlockType2,
+		blocks: toBlocks([][]int{
+			{0, 1, 1},
+			{0, 1, 0},
+			{0, 1, 0},
+		}),
+	},
+	BlockType3: &Piece{
+		blockType: BlockType3,
+		blocks: toBlocks([][]int{
+			{0, 1, 0},
+			{0, 1, 1},
+			{0, 1, 0},
+		}),
+	},
+	BlockType4: &Piece{
+		blockType: BlockType4,
+		blocks: toBlocks([][]int{
+			{0, 1, 0},
+			{0, 1, 0},
+			{0, 1, 1},
+		}),
+	},
+	BlockType5: &Piece{
+		blockType: BlockType5,
+		blocks: toBlocks([][]int{
+			{0, 0, 1},
+			{0, 1, 1},
+			{0, 1, 0},
+		}),
+	},
+	BlockType6: &Piece{
+		blockType: BlockType6,
+		blocks: toBlocks([][]int{
+			{0, 1, 0},
+			{0, 1, 1},
+			{0, 0, 1},
+		}),
+	},
+	BlockType7: &Piece{
+		blocks: toBlocks([][]int{
+			{1, 1},
+			{1, 1},
+		}),
+	},
+}
+
+const blockWidth = 10
+const blockHeight = 10
+const fieldBlockNumX = 10
+const fieldBlockNumY = 20
+
+func drawBlocks(context graphics.Context, blocks [][]BlockType, geo matrix.Geometry) {
+	parts := []graphics.TexturePart{}
+	for i, blockLine := range blocks {
+		for j, block := range blockLine {
+			if block == BlockTypeNone {
+				continue
+			}
+			locationX := j * blockWidth
+			locationY := i * blockHeight
+			source := graphics.Rect{
+				(int(block) - 1) * blockWidth, 0,
+				blockWidth, blockHeight}
+			parts = append(parts,
+				graphics.TexturePart{
+					LocationX: locationX,
+					LocationY: locationY,
+					Source:    source,
+				})
+		}
+	}
+	blocksTexture := drawInfo.textures["blocks"]
+	context.DrawTextureParts(blocksTexture, parts, geo, matrix.IdentityColor())
+}
+
+func (p *Piece) Draw(context graphics.Context, geo matrix.Geometry) {
+	blocks := make([][]BlockType, len(p.blocks))
+	for i, blockLine := range p.blocks {
+		blocks[i] = make([]BlockType, len(blockLine))
+		for j, v := range blockLine {
+			if v {
+				blocks[i][j] = p.blockType
+			}
+		}
+	}
+	drawBlocks(context, blocks, geo)
+}

example/blocks/scene_manager.go

@@ -2,42 +2,74 @@ package blocks
 
 import (
 	"github.com/hajimehoshi/go-ebiten/graphics"
+	"github.com/hajimehoshi/go-ebiten/graphics/matrix"
 )
 
-type GameState struct {
-	SceneManager *SceneManager
+func init() {
+	renderTargetSizes["scene_manager_transition_from"] =
+		Size{ScreenWidth, ScreenHeight}
+	renderTargetSizes["scene_manager_transition_to"] =
+		Size{ScreenWidth, ScreenHeight}
 }
 
 type Scene interface {
-	Update(state GameState)
+	Update(state *GameState)
 	Draw(context graphics.Context)
 }
 
+const transitionMaxCount = 20
+
 type SceneManager struct {
 	current         Scene
 	next            Scene
+	transitionCount int
 }
 
 func NewSceneManager(initScene Scene) *SceneManager {
 	return &SceneManager{
 		current:         initScene,
+		transitionCount: -1,
 	}
 }
 
-func (s *SceneManager) Update() {
-	if s.next != nil {
+func (s *SceneManager) Update(state *GameState) {
+	if s.transitionCount == -1 {
+		s.current.Update(state)
+		return
+	}
+	s.transitionCount++
+	if transitionMaxCount <= s.transitionCount {
 		s.current = s.next
 		s.next = nil
+		s.transitionCount = -1
 	}
-	s.current.Update(GameState{
-		SceneManager: s,
-	})
 }
 
 func (s *SceneManager) Draw(context graphics.Context) {
+	if s.transitionCount == -1 {
 		s.current.Draw(context)
+		return
+	}
+	from := drawInfo.renderTargets["scene_manager_transition_from"]
+	context.SetOffscreen(from)
+	context.Clear()
+	s.current.Draw(context)
+
+	to := drawInfo.renderTargets["scene_manager_transition_to"]
+	context.SetOffscreen(to)
+	context.Clear()
+	s.next.Draw(context)
+
+	context.ResetOffscreen()
+	color := matrix.IdentityColor()
+	context.DrawRenderTarget(from, matrix.IdentityGeometry(), color)
+
+	alpha := float64(s.transitionCount) / float64(transitionMaxCount)
+	color.Elements[3][3] = alpha
+	context.DrawRenderTarget(to, matrix.IdentityGeometry(), color)
 }
 
 func (s *SceneManager) GoTo(scene Scene) {
 	s.next = scene
+	s.transitionCount = 0
 }

example/blocks/title_scene.go

@@ -3,9 +3,14 @@ package blocks
 import (
 	"github.com/hajimehoshi/go-ebiten/graphics"
 	"github.com/hajimehoshi/go-ebiten/graphics/matrix"
+	"github.com/hajimehoshi/go-ebiten/ui"
 	"image/color"
 )
 
+func init() {
+	texturePaths["background"] = "images/blocks/background.png"
+}
+
 type TitleScene struct {
 	count int
 }
@@ -14,13 +19,21 @@ func NewTitleScene() *TitleScene {
 	return &TitleScene{}
 }
 
-func (s *TitleScene) Update(state GameState) {
+func (s *TitleScene) Update(state *GameState) {
 	s.count++
+	if state.Input.StateForKey(ui.KeySpace) == 1 {
+		state.SceneManager.GoTo(NewGameScene())
+	}
 }
 
 func (s *TitleScene) Draw(context graphics.Context) {
 	drawTitleBackground(context, s.count)
 	drawLogo(context, "BLOCKS")
+
+	message := "PRESS SPACE TO START"
+	x := (ScreenWidth-textWidth(message)) / 2
+	y := ScreenHeight-48
+	drawTextWithShadow(context, message, x, y, 1, color.RGBA{0x80, 0, 0, 0xff})
 }
 
 func drawTitleBackground(context graphics.Context, c int) {
@@ -39,43 +52,18 @@ func drawTitleBackground(context graphics.Context, c int) {
 		}
 	}
 
-	dx := -c % textureWidth / 2
-	dy := c % textureHeight / 2
+	dx := (-c/4) % textureWidth
+	dy := (c/4) % textureHeight
 	geo := matrix.IdentityGeometry()
 	geo.Translate(float64(dx), float64(dy))
-	context.DrawTextureParts(backgroundTextureId, parts, geo, matrix.IdentityColor())
+	clr := matrix.IdentityColor()
+	context.DrawTextureParts(backgroundTextureId, parts, geo, clr)
 }
 
 func drawLogo(context graphics.Context, str string) {
-	const charWidth = 8
-	const charHeight = 8
-	
-	fontTextureId := drawInfo.textures["font"]
-	parts := []graphics.TexturePart{}
-	
-	locationX := 0
-	locationY := 0
-	for _, c := range str {
-		if c == '\n' {
-			locationX = 0
-			locationY += charHeight
-			continue
-		}
-		code := int(c)
-		x := (code % 16) * charWidth
-		y := ((code - 32) / 16) * charHeight
-		parts = append(parts, graphics.TexturePart{
-			LocationX: locationX,
-			LocationY: locationY,
-			Source: graphics.Rect{x, y, charWidth, charHeight},
-		})
-		locationX += charWidth
-	}
-
-	geo := matrix.IdentityGeometry()
-	geo.Scale(4, 4)
-	clr := matrix.IdentityColor()
-	
-	clr.Scale(color.RGBA{0x00, 0x00, 0x60, 0xff})
-	context.DrawTextureParts(fontTextureId, parts, geo, clr)
+	scale := 4
+	textWidth := textWidth(str) * scale
+	x := (ScreenWidth - textWidth) / 2
+	y := 32
+	drawTextWithShadow(context, str, x, y, scale, color.RGBA{0x00, 0x00, 0x80, 0xff})
 }

graphics/matrix/color.go

@@ -58,15 +58,28 @@ func Monochrome() Color {
 	}
 }
 
-func (matrix *Color) Scale(clr color.Color) {
+func rgba(clr color.Color) (float64, float64, float64, float64) {
 	r, g, b, a := clr.RGBA()
 	rf := float64(r) / float64(math.MaxUint16)
 	gf := float64(g) / float64(math.MaxUint16)
 	bf := float64(b) / float64(math.MaxUint16)
 	af := float64(a) / float64(math.MaxUint16)
+	return rf, gf, bf, af
+}
+
+func (matrix *Color) Scale(clr color.Color) {
+	rf, gf, bf, af := rgba(clr)
 	for i, e := range []float64{rf, gf, bf, af} {
 		for j := 0; j < 4; j++ {
 			matrix.Elements[i][j] *= e
 		}
 	}
 }
+
+func (matrix *Color) Translate(clr color.Color) {
+	rf, gf, bf, af := rgba(clr)
+	matrix.Elements[0][4] = rf
+	matrix.Elements[1][4] = gf
+	matrix.Elements[2][4] = bf
+	matrix.Elements[3][4] = af
+}

ui/ui.go

@@ -12,6 +12,7 @@ const (
 	KeyLeft
 	KeyRight
 	KeySpace
+	KeyMax
 )
 
 type WindowSizeUpdatedEvent struct {