examples/2048: Draw texts

examples/2048/2048/board.go

@@ -18,8 +18,10 @@ import (
 	"image/color"
 	"math/rand"
 	"sort"
+	"strconv"
 
 	"github.com/hajimehoshi/ebiten"
+	"github.com/hajimehoshi/ebiten/examples/common"
 )
 
 type Board struct {
@@ -144,8 +146,8 @@ func (b *Board) Move(dir Dir) {
 }
 
 const (
-	tileSize   = 80
-	tileMargin = 4
+	tileSize   = 40
+	tileMargin = 2
 )
 
 var (
@@ -170,9 +172,11 @@ func colorToScale(clr color.Color) (float64, float64, float64, float64) {
 	bf := float64(b) / 0xffff
 	af := float64(a) / 0xffff
 	// Convert to non-premultiplied alpha components.
-	rf /= af
-	gf /= af
-	bf /= af
+	if 0 < af {
+		rf /= af
+		gf /= af
+		bf /= af
+	}
 	return rf, gf, bf, af
 }
 
@@ -202,6 +206,18 @@ func (b *Board) Draw(screen *ebiten.Image) error {
 			if err := screen.DrawImage(tileImage, op); err != nil {
 				return err
 			}
+			if t != nil {
+				str := strconv.Itoa(t.value)
+				scale := 2
+				if 2 < len(str) {
+					scale = 1
+				}
+				w := common.ArcadeFont.TextWidth(str) * scale
+				h := common.ArcadeFont.TextHeight(str) * scale
+				x := x + (tileSize-w)/2
+				y := y + (tileSize-h)/2
+				common.ArcadeFont.DrawText(screen, str, x, y, scale, tileColor(t.value))
+			}
 		}
 	}
 	return nil

examples/2048/2048/game.go

@@ -26,8 +26,8 @@ func init() {
 }
 
 const (
-	ScreenWidth  = 420
-	ScreenHeight = 600
+	ScreenWidth  = 210
+	ScreenHeight = 300
 	boardSize    = 4
 )
 

examples/2048/main.go

@@ -39,7 +39,7 @@ func update(screen *ebiten.Image) error {
 }
 
 func main() {
-	if err := ebiten.Run(update, twenty48.ScreenWidth, twenty48.ScreenHeight, 1, "2048 (Ebiten Demo)"); err != nil {
+	if err := ebiten.Run(update, twenty48.ScreenWidth, twenty48.ScreenHeight, 2, "2048 (Ebiten Demo)"); err != nil {
 		log.Fatal(err)
 	}
 }

examples/common/font.go

@@ -45,6 +45,11 @@ func (f *Font) TextWidth(str string) int {
 	return f.charWidth * len(str)
 }
 
+func (f *Font) TextHeight(str string) int {
+	// TODO: Take care about '\n'
+	return f.charHeight
+}
+
 func init() {
 	dir := ""
 	if runtime.GOARCH != "js" {