/
main.go
165 lines (134 loc) · 3.02 KB
/
main.go
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package main
import (
"bytes"
"image"
_ "image/png"
"log"
"math"
"math/rand"
"time"
"github.com/hajimehoshi/ebiten"
)
const (
Scale = 10
TaskbarHeight = 40
)
type Vector struct {
X, Y float64
}
type Gopher struct {
Sheet *ebiten.Image
Pos Vector
Vel Vector
Jumping bool
Right bool
Frame float64
}
func NewGopher() *Gopher {
png, _, err := image.Decode(bytes.NewReader(SpriteSheetPNG[:]))
if err != nil {
panic(err)
}
m, err := ebiten.NewImageFromImage(png, ebiten.FilterNearest)
if err != nil {
panic(err)
}
g := &Gopher{Sheet: m}
g.Pos.X += 400
return g
}
func (g *Gopher) FrameRect(i int) image.Rectangle {
return image.Rectangle{
Min: image.Pt(SpriteWidth*i, 0),
Max: image.Pt(SpriteWidth*i+SpriteWidth, SpriteHeight),
}
}
func (g *Gopher) Update(screen *ebiten.Image) error {
screenWidth, screenHeight := ebiten.ScreenSizeInFullscreen()
dt := 1.0 / ebiten.FPS
var dir Vector
if ebiten.IsKeyPressed(ebiten.KeySpace) {
if !g.Jumping {
g.Vel.Y = 80
}
g.Jumping = true
}
if ebiten.IsKeyPressed(ebiten.KeyLeft) {
dir.X -= 1
}
if ebiten.IsKeyPressed(ebiten.KeyRight) {
dir.X += 1
}
g.Vel.X += dir.X * dt * 400
g.Vel.X *= math.Pow(0.01, dt)
g.Vel.Y -= dt * 120
if g.Pos.Y <= 0 && g.Vel.Y <= 0 {
g.Vel.Y = 0
g.Pos.Y = 0
g.Jumping = false
}
g.Pos.X += g.Vel.X * dt
g.Pos.Y += g.Vel.Y * dt
if g.Pos.X < 0 {
g.Pos.X = 0
} else if g.Pos.X > float64(screenWidth/Scale-SpriteWidth) {
g.Pos.X = float64(screenWidth/Scale - SpriteWidth)
}
if g.Vel.X > 0.01 {
g.Right = true
} else if g.Vel.X < -0.01 {
g.Right = false
}
ebiten.SetWindowPosition(
int(g.Pos.X*Scale),
-int(g.Pos.Y*Scale)-SpriteHeight*Scale+screenHeight-TaskbarHeight,
)
if ebiten.IsDrawingSkipped() {
return nil
}
if g.Pos.Y > 0 {
if math.Abs(g.Vel.X) < 10 || math.Abs(g.Vel.Y) < 10 {
g.DrawFrame(screen, SpriteFrames_Jump_Float)
} else if g.Vel.Y < 0 {
g.DrawFrame(screen, SpriteFrames_Jump_Fall)
} else {
g.DrawFrame(screen, SpriteFrames_Jump_Rise)
}
} else {
if math.Abs(g.Vel.X) < 1 {
g.Frame += 8 * dt
g.DrawFrame(screen, SpriteFrames_Front)
} else {
if math.Abs(g.Vel.X) < 52 {
g.DrawFrame(screen, SpriteFrames_Walk)
} else {
g.DrawFrame(screen, SpriteFrames_Run)
}
}
}
g.Frame += math.Abs(g.Vel.X*dt) * 0.2
return nil
}
func (g *Gopher) DrawFrame(screen *ebiten.Image, frames []int) {
op := &ebiten.DrawImageOptions{}
if g.Right {
op.GeoM.Scale(-1, 1)
op.GeoM.Translate(SpriteWidth, 0)
}
op.GeoM.Scale(Scale, Scale)
frameIndex := int(g.Frame) % len(frames)
frameRect := g.FrameRect(frames[frameIndex])
sprite := g.Sheet.SubImage(frameRect).(*ebiten.Image)
screen.DrawImage(sprite, op)
}
func main() {
rand.Seed(time.Now().UnixNano())
ebiten.SetScreenTransparent(true)
ebiten.SetWindowDecorated(false)
ebiten.SetRunnableOnUnfocused(true)
ebiten.SetWindowFloating(true)
gopher := NewGopher()
if err := ebiten.Run(gopher.Update, SpriteWidth*Scale, SpriteHeight*Scale, 1, "Running Gopher"); err != nil {
log.Fatal(err)
}
}