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286 lines
9.7 KiB
HTML
286 lines
9.7 KiB
HTML
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<!DOCTYPE html>
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<meta charset="utf-8">
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<meta property="og:image" itemprop="image primaryImageOfPage" content="https://hajimehoshi.github.io/ebiten/images/examples/airship.png">
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<meta name="description" content="Ebiten example - airship">
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<link rel="shortcut icon" href="../favicon.png" type="image/png" >
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<link rel="icon" href="../favicon.png" type="image/png" >
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<title>Ebiten example - airship</title>
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<link rel="stylesheet" href="../stylesheets/bootstrap.min.css">
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<link rel="stylesheet" href="../stylesheets/highlight-github.css">
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<link rel="stylesheet" href="../stylesheets/ebiten.css">
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<script src="../scripts/googleanalytics.js"></script>
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<nav class="navbar"><div class="container">
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<nav class="d-flex flex-row" style="width: 100%;">
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<div class="nav mr-auto"><a class="navbar-brand" href="../"><img src="../images/logo_white.svg" alt="EBITEN"></a></div>
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<ul class="nav">
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<li class="nav-item"><a class="nav-link" href="https://github.com/hajimehoshi/ebiten">GitHub</a></li>
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<li class="nav-item"><a class="nav-link" href="https://godoc.org/github.com/hajimehoshi/ebiten">GoDoc</a></li>
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<li class="nav-item"><a class="nav-link" href="https://github.com/hajimehoshi/ebiten/wiki">Wiki</a>
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<li class="nav-item"><a class="nav-link" href="https://ebiten-playground.github.io/">Playground</a>
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</ul>
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</nav>
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</div></nav>
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<main><div class="container">
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<h2>Ebiten example - airship</h2>
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<iframe src="airship.content.html" width="640" height="480"></iframe>
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<div class="card"><pre class="card-body"><code class="language-go">// +build example
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package main
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import (
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"fmt"
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"image"
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"image/color"
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_ "image/jpeg"
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"log"
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"math"
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"github.com/hajimehoshi/ebiten"
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"github.com/hajimehoshi/ebiten/ebitenutil"
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)
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const (
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screenWidth = 320
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screenHeight = 240
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maxAngle = 256
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maxLean = 16
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)
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var (
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skyColor = color.RGBA{0x66, 0xcc, 0xff, 0xff}
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thePlayer = &player{
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x16: 16 * 100,
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y16: 16 * 200,
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angle: maxAngle * 3 / 4,
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}
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gophersImage *ebiten.Image
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repeatedGophersImage *ebiten.Image
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groundImage *ebiten.Image
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perspectiveGroundImage *ebiten.Image
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fogImage *ebiten.Image
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)
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func init() {
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var err error
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gophersImage, _, err = ebitenutil.NewImageFromFile("_resources/images/gophers.jpg", ebiten.FilterDefault)
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if err != nil {
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panic(err)
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}
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groundImage, _ = ebiten.NewImage(screenWidth*2, screenHeight*2/3+50, ebiten.FilterDefault)
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perspectiveGroundImage, _ = ebiten.NewImage(screenWidth*2, screenHeight, ebiten.FilterDefault)
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const repeat = 5
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w, h := gophersImage.Size()
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repeatedGophersImage, _ = ebiten.NewImage(w*repeat, h*repeat, ebiten.FilterDefault)
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for j := 0; j < repeat; j++ {
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for i := 0; i < repeat; i++ {
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op := &ebiten.DrawImageOptions{}
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op.GeoM.Translate(float64(w*i), float64(h*j))
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repeatedGophersImage.DrawImage(gophersImage, op)
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}
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}
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const fogHeight = 8
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w, _ = perspectiveGroundImage.Size()
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fogRGBA := image.NewRGBA(image.Rect(0, 0, w, fogHeight))
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for j := 0; j < fogHeight; j++ {
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a := uint32(float64(fogHeight-1-j) * 0xff / (fogHeight - 1))
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clr := skyColor
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r, g, b, oa := uint32(clr.R), uint32(clr.G), uint32(clr.B), uint32(clr.A)
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clr.R = uint8(r * a / oa)
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clr.G = uint8(g * a / oa)
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clr.B = uint8(b * a / oa)
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clr.A = uint8(a)
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for i := 0; i < w; i++ {
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fogRGBA.SetRGBA(i, j, clr)
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}
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}
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fogImage, _ = ebiten.NewImageFromImage(fogRGBA, ebiten.FilterDefault)
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}
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// player represents the current airship's position.
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type player struct {
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// x16, y16 represents the position in XY plane in fixed float format.
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// The fractional part has 16 bits of precision.
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x16 int
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y16 int
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// angle represents the player's angle in XY plane.
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// angle takes an integer value in [0, maxAngle).
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angle int
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// lean represents the player's leaning.
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// lean takes an integer value in [-maxLean, maxLean].
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lean int
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}
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func round(x float64) float64 {
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return math.Floor(x + 0.5)
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}
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// MoveForward moves the player p forward.
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func (p *player) MoveForward() {
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w, h := gophersImage.Size()
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mx := w * 16
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my := h * 16
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s, c := math.Sincos(float64(p.angle) * 2 * math.Pi / maxAngle)
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p.x16 += int(round(16*c) * 2)
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p.y16 += int(round(16*s) * 2)
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for mx <= p.x16 {
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p.x16 -= mx
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}
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for my <= p.y16 {
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p.y16 -= my
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}
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for p.x16 < 0 {
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p.x16 += mx
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}
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for p.y16 < 0 {
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p.y16 += my
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}
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}
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// RotateRight rotates the player p in the right direction.
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func (p *player) RotateRight() {
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p.angle++
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if maxAngle <= p.angle {
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p.angle -= maxAngle
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}
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p.lean++
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if maxLean < p.lean {
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p.lean = maxLean
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}
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}
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// RotateLeft rotates the player p in the left direction.
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func (p *player) RotateLeft() {
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p.angle--
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if p.angle < 0 {
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p.angle += maxAngle
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}
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p.lean--
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if p.lean < -maxLean {
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p.lean = -maxLean
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}
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}
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// Stabilize tries to move the player in the stable position (lean).
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func (p *player) Stabilize() {
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if 0 < p.lean {
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p.lean--
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}
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if p.lean < 0 {
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p.lean++
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}
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}
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// Position returns the player p's position.
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func (p *player) Position() (int, int) {
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return p.x16, p.y16
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}
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// Angle returns the player p's angle.
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func (p *player) Angle() int {
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return p.angle
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}
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// updateGroundImage updates the ground image according to the current player's position.
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func updateGroundImage(ground *ebiten.Image) {
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ground.Clear()
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x16, y16 := thePlayer.Position()
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a := thePlayer.Angle()
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gw, gh := ground.Size()
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w, h := gophersImage.Size()
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op := &ebiten.DrawImageOptions{}
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op.GeoM.Translate(float64(-x16)/16, float64(-y16)/16)
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op.GeoM.Translate(float64(-w*2), float64(-h*2))
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op.GeoM.Rotate(float64(-a)*2*math.Pi/maxAngle + math.Pi*3.0/2.0)
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op.GeoM.Translate(float64(gw)/2, float64(gh)-32)
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ground.DrawImage(repeatedGophersImage, op)
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}
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// drawGroundImage draws the ground image to the given screen image.
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func drawGroundImage(screen *ebiten.Image, ground *ebiten.Image) {
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perspectiveGroundImage.Clear()
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gw, _ := ground.Size()
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pw, ph := perspectiveGroundImage.Size()
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for j := 0; j < ph; j++ {
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// z is in [1.5, 0.01]
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rate := float64(j) / float64(ph)
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z := (1-rate)*1.5 + rate*0.01
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op := &ebiten.DrawImageOptions{}
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op.GeoM.Translate(-float64(pw)/2, 0)
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op.GeoM.Scale(1/z, 4) // 4 is an arbitrary number not to make empty lines.
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op.GeoM.Translate(float64(pw)/2, float64(j)/z)
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src := image.Rect(0, j, gw, j+1)
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op.SourceRect = &src
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perspectiveGroundImage.DrawImage(ground, op)
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}
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perspectiveGroundImage.DrawImage(fogImage, nil)
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op := &ebiten.DrawImageOptions{}
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op.GeoM.Translate(-float64(pw)/2, 0)
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op.GeoM.Rotate(-1 * float64(thePlayer.lean) / maxLean * math.Pi / 8)
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op.GeoM.Translate(float64(screenWidth)/2, screenHeight/3)
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screen.DrawImage(perspectiveGroundImage, op)
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}
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func update(screen *ebiten.Image) error {
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// Manipulate the player by the input.
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if ebiten.IsKeyPressed(ebiten.KeySpace) {
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thePlayer.MoveForward()
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}
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rotated := false
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if ebiten.IsKeyPressed(ebiten.KeyRight) {
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thePlayer.RotateRight()
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rotated = true
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}
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if ebiten.IsKeyPressed(ebiten.KeyLeft) {
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thePlayer.RotateLeft()
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rotated = true
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}
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if !rotated {
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thePlayer.Stabilize()
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}
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if ebiten.IsRunningSlowly() {
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return nil
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}
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// Draw the ground image.
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screen.Fill(skyColor)
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updateGroundImage(groundImage)
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drawGroundImage(screen, groundImage)
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// Draw the message.
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tutrial := "Space: Move forward\nLeft/Right: Rotate"
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msg := fmt.Sprintf("FPS: %0.2f\n%s", ebiten.CurrentFPS(), tutrial)
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ebitenutil.DebugPrint(screen, msg)
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return nil
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}
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func main() {
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if err := ebiten.Run(update, screenWidth, screenHeight, 2, "Air Ship (Ebiten Demo)"); err != nil {
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log.Fatal(err)
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}
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}
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</code></pre></div>
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</div></main>
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<footer><div class="container">
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<p>© 2013 Hajime Hoshi</p>
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<p>Code is licensed under <a href="https://github.com/hajimehoshi/ebiten/blob/master/LICENSE">the Apache License 2.0</a>.</p>
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<p>The content of this page is licensed under <a href="https://creativecommons.org/licenses/by/4.0/">the Creative Commons Attribution 4.0 License</a>.</p>
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</div></footer>
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<script src="../scripts/highlight.pack.js"></script>
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<script>hljs.initHighlightingOnLoad();</script>
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