mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2025-10-31 19:52:47 +08:00
449 lines
10 KiB
Go
449 lines
10 KiB
Go
// Copyright 2018 The Ebiten Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//go:build example
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// +build example
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package main
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import (
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"bytes"
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"fmt"
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"image"
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"image/color"
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_ "image/png"
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"log"
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"math"
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"math/rand"
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"time"
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"golang.org/x/image/font"
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"golang.org/x/image/font/opentype"
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"github.com/hajimehoshi/ebiten/v2"
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"github.com/hajimehoshi/ebiten/v2/audio"
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"github.com/hajimehoshi/ebiten/v2/audio/vorbis"
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"github.com/hajimehoshi/ebiten/v2/audio/wav"
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"github.com/hajimehoshi/ebiten/v2/ebitenutil"
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raudio "github.com/hajimehoshi/ebiten/v2/examples/resources/audio"
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"github.com/hajimehoshi/ebiten/v2/examples/resources/fonts"
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resources "github.com/hajimehoshi/ebiten/v2/examples/resources/images/flappy"
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"github.com/hajimehoshi/ebiten/v2/inpututil"
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"github.com/hajimehoshi/ebiten/v2/text"
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)
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func init() {
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rand.Seed(time.Now().UnixNano())
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}
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func floorDiv(x, y int) int {
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d := x / y
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if d*y == x || x >= 0 {
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return d
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}
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return d - 1
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}
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func floorMod(x, y int) int {
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return x - floorDiv(x, y)*y
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}
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const (
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screenWidth = 640
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screenHeight = 480
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tileSize = 32
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titleFontSize = fontSize * 1.5
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fontSize = 24
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smallFontSize = fontSize / 2
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pipeWidth = tileSize * 2
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pipeStartOffsetX = 8
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pipeIntervalX = 8
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pipeGapY = 5
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)
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var (
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gopherImage *ebiten.Image
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tilesImage *ebiten.Image
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titleArcadeFont font.Face
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arcadeFont font.Face
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smallArcadeFont font.Face
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)
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func init() {
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img, _, err := image.Decode(bytes.NewReader(resources.Gopher_png))
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if err != nil {
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log.Fatal(err)
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}
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gopherImage = ebiten.NewImageFromImage(img)
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img, _, err = image.Decode(bytes.NewReader(resources.Tiles_png))
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if err != nil {
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log.Fatal(err)
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}
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tilesImage = ebiten.NewImageFromImage(img)
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}
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func init() {
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tt, err := opentype.Parse(fonts.PressStart2P_ttf)
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if err != nil {
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log.Fatal(err)
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}
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const dpi = 72
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titleArcadeFont, err = opentype.NewFace(tt, &opentype.FaceOptions{
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Size: titleFontSize,
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DPI: dpi,
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Hinting: font.HintingFull,
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})
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if err != nil {
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log.Fatal(err)
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}
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arcadeFont, err = opentype.NewFace(tt, &opentype.FaceOptions{
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Size: fontSize,
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DPI: dpi,
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Hinting: font.HintingFull,
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})
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if err != nil {
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log.Fatal(err)
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}
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smallArcadeFont, err = opentype.NewFace(tt, &opentype.FaceOptions{
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Size: smallFontSize,
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DPI: dpi,
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Hinting: font.HintingFull,
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})
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if err != nil {
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log.Fatal(err)
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}
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}
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type Mode int
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const (
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ModeTitle Mode = iota
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ModeGame
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ModeGameOver
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)
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type Game struct {
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mode Mode
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// The gopher's position
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x16 int
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y16 int
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vy16 int
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// Camera
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cameraX int
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cameraY int
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// Pipes
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pipeTileYs []int
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gameoverCount int
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touchIDs []ebiten.TouchID
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gamepadIDs []ebiten.GamepadID
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audioContext *audio.Context
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jumpPlayer *audio.Player
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hitPlayer *audio.Player
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}
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func NewGame() *Game {
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g := &Game{}
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g.init()
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return g
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}
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func (g *Game) init() {
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g.x16 = 0
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g.y16 = 100 * 16
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g.cameraX = -240
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g.cameraY = 0
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g.pipeTileYs = make([]int, 256)
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for i := range g.pipeTileYs {
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g.pipeTileYs[i] = rand.Intn(6) + 2
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}
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if g.audioContext == nil {
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g.audioContext = audio.NewContext(48000)
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}
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jumpD, err := vorbis.DecodeWithoutResampling(bytes.NewReader(raudio.Jump_ogg))
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if err != nil {
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log.Fatal(err)
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}
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g.jumpPlayer, err = g.audioContext.NewPlayer(jumpD)
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if err != nil {
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log.Fatal(err)
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}
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jabD, err := wav.DecodeWithoutResampling(bytes.NewReader(raudio.Jab_wav))
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if err != nil {
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log.Fatal(err)
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}
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g.hitPlayer, err = g.audioContext.NewPlayer(jabD)
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if err != nil {
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log.Fatal(err)
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}
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}
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func (g *Game) isKeyJustPressed() bool {
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if inpututil.IsKeyJustPressed(ebiten.KeySpace) {
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return true
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}
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if inpututil.IsMouseButtonJustPressed(ebiten.MouseButtonLeft) {
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return true
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}
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g.touchIDs = inpututil.AppendJustPressedTouchIDs(g.touchIDs[:0])
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if len(g.touchIDs) > 0 {
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return true
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}
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g.gamepadIDs = ebiten.AppendGamepadIDs(g.gamepadIDs[:0])
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for _, g := range g.gamepadIDs {
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if ebiten.IsStandardGamepadLayoutAvailable(g) {
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if inpututil.IsStandardGamepadButtonJustPressed(g, ebiten.StandardGamepadButtonRightBottom) {
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return true
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}
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if inpututil.IsStandardGamepadButtonJustPressed(g, ebiten.StandardGamepadButtonRightRight) {
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return true
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}
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} else {
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// The button 0/1 might not be A/B buttons.
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if inpututil.IsGamepadButtonJustPressed(g, ebiten.GamepadButton0) {
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return true
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}
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if inpututil.IsGamepadButtonJustPressed(g, ebiten.GamepadButton1) {
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return true
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}
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}
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}
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return false
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}
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func (g *Game) Layout(outsideWidth, outsideHeight int) (int, int) {
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return screenWidth, screenHeight
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}
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func (g *Game) Update() error {
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switch g.mode {
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case ModeTitle:
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if g.isKeyJustPressed() {
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g.mode = ModeGame
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}
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case ModeGame:
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g.x16 += 32
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g.cameraX += 2
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if g.isKeyJustPressed() {
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g.vy16 = -96
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if err := g.jumpPlayer.Rewind(); err != nil {
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return err
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}
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g.jumpPlayer.Play()
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}
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g.y16 += g.vy16
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// Gravity
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g.vy16 += 4
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if g.vy16 > 96 {
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g.vy16 = 96
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}
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if g.hit() {
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if err := g.hitPlayer.Rewind(); err != nil {
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return err
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}
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g.hitPlayer.Play()
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g.mode = ModeGameOver
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g.gameoverCount = 30
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}
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case ModeGameOver:
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if g.gameoverCount > 0 {
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g.gameoverCount--
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}
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if g.gameoverCount == 0 && g.isKeyJustPressed() {
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g.init()
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g.mode = ModeTitle
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}
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}
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return nil
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}
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func (g *Game) Draw(screen *ebiten.Image) {
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screen.Fill(color.RGBA{0x80, 0xa0, 0xc0, 0xff})
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g.drawTiles(screen)
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if g.mode != ModeTitle {
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g.drawGopher(screen)
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}
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var titleTexts []string
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var texts []string
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switch g.mode {
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case ModeTitle:
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titleTexts = []string{"FLAPPY GOPHER"}
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texts = []string{"", "", "", "", "", "", "", "PRESS SPACE KEY", "", "OR A/B BUTTON", "", "OR TOUCH SCREEN"}
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case ModeGameOver:
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texts = []string{"", "GAME OVER!"}
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}
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for i, l := range titleTexts {
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x := (screenWidth - len(l)*titleFontSize) / 2
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text.Draw(screen, l, titleArcadeFont, x, (i+4)*titleFontSize, color.White)
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}
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for i, l := range texts {
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x := (screenWidth - len(l)*fontSize) / 2
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text.Draw(screen, l, arcadeFont, x, (i+4)*fontSize, color.White)
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}
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if g.mode == ModeTitle {
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msg := []string{
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"Go Gopher by Renee French is",
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"licenced under CC BY 3.0.",
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}
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for i, l := range msg {
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x := (screenWidth - len(l)*smallFontSize) / 2
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text.Draw(screen, l, smallArcadeFont, x, screenHeight-4+(i-1)*smallFontSize, color.White)
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}
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}
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scoreStr := fmt.Sprintf("%04d", g.score())
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text.Draw(screen, scoreStr, arcadeFont, screenWidth-len(scoreStr)*fontSize, fontSize, color.White)
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ebitenutil.DebugPrint(screen, fmt.Sprintf("TPS: %0.2f", ebiten.ActualTPS()))
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}
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func (g *Game) pipeAt(tileX int) (tileY int, ok bool) {
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if (tileX - pipeStartOffsetX) <= 0 {
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return 0, false
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}
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if floorMod(tileX-pipeStartOffsetX, pipeIntervalX) != 0 {
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return 0, false
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}
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idx := floorDiv(tileX-pipeStartOffsetX, pipeIntervalX)
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return g.pipeTileYs[idx%len(g.pipeTileYs)], true
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}
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func (g *Game) score() int {
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x := floorDiv(g.x16, 16) / tileSize
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if (x - pipeStartOffsetX) <= 0 {
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return 0
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}
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return floorDiv(x-pipeStartOffsetX, pipeIntervalX)
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}
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func (g *Game) hit() bool {
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if g.mode != ModeGame {
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return false
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}
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const (
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gopherWidth = 30
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gopherHeight = 60
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)
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w, h := gopherImage.Size()
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x0 := floorDiv(g.x16, 16) + (w-gopherWidth)/2
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y0 := floorDiv(g.y16, 16) + (h-gopherHeight)/2
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x1 := x0 + gopherWidth
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y1 := y0 + gopherHeight
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if y0 < -tileSize*4 {
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return true
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}
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if y1 >= screenHeight-tileSize {
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return true
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}
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xMin := floorDiv(x0-pipeWidth, tileSize)
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xMax := floorDiv(x0+gopherWidth, tileSize)
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for x := xMin; x <= xMax; x++ {
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y, ok := g.pipeAt(x)
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if !ok {
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continue
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}
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if x0 >= x*tileSize+pipeWidth {
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continue
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}
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if x1 < x*tileSize {
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continue
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}
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if y0 < y*tileSize {
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return true
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}
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if y1 >= (y+pipeGapY)*tileSize {
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return true
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}
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}
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return false
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}
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func (g *Game) drawTiles(screen *ebiten.Image) {
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const (
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nx = screenWidth / tileSize
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ny = screenHeight / tileSize
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pipeTileSrcX = 128
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pipeTileSrcY = 192
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)
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op := &ebiten.DrawImageOptions{}
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for i := -2; i < nx+1; i++ {
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// ground
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op.GeoM.Reset()
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op.GeoM.Translate(float64(i*tileSize-floorMod(g.cameraX, tileSize)),
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float64((ny-1)*tileSize-floorMod(g.cameraY, tileSize)))
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screen.DrawImage(tilesImage.SubImage(image.Rect(0, 0, tileSize, tileSize)).(*ebiten.Image), op)
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// pipe
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if tileY, ok := g.pipeAt(floorDiv(g.cameraX, tileSize) + i); ok {
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for j := 0; j < tileY; j++ {
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op.GeoM.Reset()
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op.GeoM.Scale(1, -1)
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op.GeoM.Translate(float64(i*tileSize-floorMod(g.cameraX, tileSize)),
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float64(j*tileSize-floorMod(g.cameraY, tileSize)))
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op.GeoM.Translate(0, tileSize)
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var r image.Rectangle
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if j == tileY-1 {
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r = image.Rect(pipeTileSrcX, pipeTileSrcY, pipeTileSrcX+tileSize*2, pipeTileSrcY+tileSize)
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} else {
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r = image.Rect(pipeTileSrcX, pipeTileSrcY+tileSize, pipeTileSrcX+tileSize*2, pipeTileSrcY+tileSize*2)
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}
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screen.DrawImage(tilesImage.SubImage(r).(*ebiten.Image), op)
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}
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for j := tileY + pipeGapY; j < screenHeight/tileSize-1; j++ {
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op.GeoM.Reset()
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op.GeoM.Translate(float64(i*tileSize-floorMod(g.cameraX, tileSize)),
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float64(j*tileSize-floorMod(g.cameraY, tileSize)))
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var r image.Rectangle
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if j == tileY+pipeGapY {
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r = image.Rect(pipeTileSrcX, pipeTileSrcY, pipeTileSrcX+pipeWidth, pipeTileSrcY+tileSize)
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} else {
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r = image.Rect(pipeTileSrcX, pipeTileSrcY+tileSize, pipeTileSrcX+pipeWidth, pipeTileSrcY+tileSize+tileSize)
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}
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screen.DrawImage(tilesImage.SubImage(r).(*ebiten.Image), op)
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}
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}
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}
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}
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func (g *Game) drawGopher(screen *ebiten.Image) {
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op := &ebiten.DrawImageOptions{}
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w, h := gopherImage.Size()
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op.GeoM.Translate(-float64(w)/2.0, -float64(h)/2.0)
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op.GeoM.Rotate(float64(g.vy16) / 96.0 * math.Pi / 6)
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op.GeoM.Translate(float64(w)/2.0, float64(h)/2.0)
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op.GeoM.Translate(float64(g.x16/16.0)-float64(g.cameraX), float64(g.y16/16.0)-float64(g.cameraY))
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op.Filter = ebiten.FilterLinear
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screen.DrawImage(gopherImage, op)
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}
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func main() {
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ebiten.SetWindowSize(screenWidth, screenHeight)
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ebiten.SetWindowTitle("Flappy Gopher (Ebitengine Demo)")
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if err := ebiten.RunGame(NewGame()); err != nil {
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panic(err)
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}
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}
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