ebiten/example/blocks/title_scene.go
2013-12-19 03:21:25 +09:00

70 lines
1.7 KiB
Go

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
}
func NewTitleScene() *TitleScene {
return &TitleScene{}
}
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) {
const textureWidth = 32
const textureHeight = 32
backgroundTextureId := drawInfo.textures["background"]
parts := []graphics.TexturePart{}
for j := -1; j < ScreenHeight/textureHeight+1; j++ {
for i := 0; i < ScreenWidth/textureWidth+1; i++ {
parts = append(parts, graphics.TexturePart{
LocationX: i * textureWidth,
LocationY: j * textureHeight,
Source: graphics.Rect{0, 0, textureWidth, textureHeight},
})
}
}
dx := (-c/4) % textureWidth
dy := (c/4) % textureHeight
geo := matrix.IdentityGeometry()
geo.Translate(float64(dx), float64(dy))
clr := matrix.IdentityColor()
context.DrawTextureParts(backgroundTextureId, parts, geo, clr)
}
func drawLogo(context graphics.Context, str string) {
scale := 4
textWidth := textWidth(str) * scale
x := (ScreenWidth - textWidth) / 2
y := 32
drawTextWithShadow(context, str, x, y, scale, color.RGBA{0x00, 0x00, 0x80, 0xff})
}