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package main
import (
"image/color"
_ "image/png"
"log"
"math"
"github.com/hajimehoshi/ebiten/v2"
"github.com/hajimehoshi/ebiten/v2/ebitenutil"
"github.com/hajimehoshi/ebiten/v2/vector"
)
const screen_w, screen_h = 640, 480
type Penguin struct {
img *ebiten.Image
x, y float64
xv, yv float64
}
func newPenguin() Penguin {
penguin := Penguin{
x: screen_w / 2,
y: 0,
xv: 0,
yv: 0,
}
var err error
penguin.img, _, err = ebitenutil.NewImageFromFile("assets/penguin.png")
if err != nil {
log.Fatal(err)
}
return penguin;
}
func (penguin *Penguin) draw(screen *ebiten.Image) {
op := &ebiten.DrawImageOptions{}
op.GeoM.Translate(penguin.x, penguin.y)
screen.DrawImage(penguin.img, op)
}
func (penguin *Penguin) drawBounds(screen *ebiten.Image) {
vector.StrokeRect(screen,
float32(penguin.x), float32(penguin.y),
float32(penguin.img.Bounds().Dx()), float32(penguin.img.Bounds().Dy()),
4, color.RGBA{0xcc, 0x66, 0x66, 0xff}, true)
}
func (penguin *Penguin) update(g *Game) {
if penguin.collideWithCurve(g.ground, penguin.xv, 0){
penguin.xv = 0
penguin.yv -= 4
} else {
penguin.x += penguin.xv
penguin.xv *= 0.9
}
if penguin.collideWithCurve(g.ground, 0, penguin.yv){
penguin.yv = 0
} else {
penguin.y += penguin.yv
penguin.yv += 0.9
}
}
func (p *Penguin) collideWithCurve(curve Curve, xv, yv float64) bool {
cy1 := curve(p.x + xv)
y1 := p.y + yv
y2 := p.y + yv + float64(p.img.Bounds().Dy())
if y1 < cy1 && cy1 < y2 {
return true
}
cy2 := curve(p.x + xv + float64(p.img.Bounds().Dx()))
if y1 < cy2 && cy2 < y2 {
return true
}
return false
}
func (g *Game) init() {
g.penguin = newPenguin()
}
type Curve func(x float64)(y float64)
func (curve Curve) draw(dst *ebiten.Image, clr color.Color, width float32, resolution int, antialias bool) {
for x1 := 0; x1 < screen_w; x1 += resolution {
x2 := x1 + resolution
y1 := curve(float64(x1))
y2 := curve(float64(x2))
vector.StrokeLine(dst, float32(x1), float32(y1), float32(x2), float32(y2), width, color.RGBA{0x19, 0x19, 0x19, 0xff}, true)
}
}
type Game struct{
penguin Penguin
ground Curve
}
func (g *Game) Update() error {
if ebiten.IsKeyPressed(ebiten.KeyArrowRight) {
g.penguin.xv = 4
}
if ebiten.IsKeyPressed(ebiten.KeyArrowLeft) {
g.penguin.xv = -4
}
if ebiten.IsKeyPressed(ebiten.KeyArrowUp) {
g.penguin.yv = -4
}
if ebiten.IsKeyPressed(ebiten.KeyArrowDown) {
g.penguin.yv = 4
}
g.penguin.update(g)
return nil
}
func (g *Game) Draw(screen *ebiten.Image) {
screen.Fill(color.RGBA{0xfe, 0xfe, 0xfe, 0xff})
g.ground.draw(screen, color.RGBA{0x19, 0x19, 0x19, 0xff}, 4, 16, true);
g.penguin.draw(screen)
g.penguin.drawBounds(screen)
}
func (g *Game) Layout(outsideWidth, outsideHeight int) (screenWidth, screenHeight int) {
return 640, 480
}
func main() {
ebiten.SetWindowSize(640, 480)
ebiten.SetWindowTitle("penguin")
game := Game{}
game.ground = func(x float64)(y float64) {
return 200-math.Pow((x - 320)/320, 3)+math.Pow((x-320), 2)/300
}
game.init()
if err := ebiten.RunGame(&game); err != nil {
log.Fatal(err)
}
}
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