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package main
import (
"log"
"image"
"github.com/hajimehoshi/ebiten/v2"
"github.com/hajimehoshi/ebiten/v2/ebitenutil"
)
const (
SPRING_FORCE = 8
)
type GameObject struct {
startx, starty float32
x, y float32
vx, vy float32
offsetX, offsetY int
friction float32
resistance float32
image *ebiten.Image
onGround bool
onCollideX func(this, other *GameObject) bool
onCollideY func(this, other *GameObject) bool
}
type Player struct {
GameObject
}
func (o * GameObject) Update(tilemap Tilemap, others []*GameObject) {
o.vy += gravity
o.vx *= o.resistance
o.vy *= o.resistance
o.x += o.vx
if o.HasCollision(tilemap, others, true) {
o.x -= o.vx
o.vx = 0
}
o.y += o.vy
if o.HasCollision(tilemap, others, false) {
o.onGround = true;
o.vx *= o.friction
o.y -= o.vy
o.vy = 0
} else {
o.onGround = false;
}
}
func (o * GameObject) HasCollision(tilemap Tilemap, others []*GameObject, x bool) bool {
if tilemap.CollideObject(o) {
return true
}
for _, obj := range others {
if obj.Collide(o) {
var f func(this, other *GameObject) bool
if x {
f = obj.onCollideX
} else {
f = obj.onCollideY
}
if f == nil{
return true
}
return f(obj, o)
}
}
return false
}
func (o * GameObject) Draw(screen *ebiten.Image, tilemap Tilemap) {
op := &ebiten.DrawImageOptions{}
op.GeoM.Translate(float64(o.x), float64(o.y))
screen.DrawImage(o.image, op)
}
func (object * GameObject) Collide(other *GameObject) bool {
maxX1 := object.x + float32(object.image.Bounds().Dx())
maxY1 := object.y + float32(object.image.Bounds().Dy())
minX1 := object.x
minY1 := object.y
maxX2 := other.x + float32(other.image.Bounds().Dx())
maxY2 := other.y + float32(other.image.Bounds().Dy())
minX2 := other.x
minY2 := other.y
if (minX1 == minX2 && maxX1 == maxX2 && minY1 == minY2 && maxY1 == maxY2) {
return false
}
return ! ( minX2 >= maxX1 || maxX2 <= minX1 || minY2 >= maxY1 || maxY2 <= minY1)
}
func (object * GameObject) ToRect() image.Rectangle {
width := object.image.Bounds().Dx()
height := object.image.Bounds().Dy()
x := int(object.x)
y := int(object.y)
return image.Rect(x, y, x+width, y+height)
}
func OnCollideGeneric(this, other *GameObject) bool {
return true
}
func NewObject(x, y float32) *GameObject{
obj := &GameObject{
startx: x,
starty: y,
}
obj.friction = friction
obj.resistance = airResistance
obj.x = obj.startx
obj.y = obj.starty
return obj
}
func NewPlayer(x, y float32) *GameObject{
player := NewObject(x, y)
playerImage, _, err := ebitenutil.NewImageFromFile("character.png")
if err != nil {
log.Fatal(err)
}
player.image = playerImage.SubImage(image.Rect(4, 8, 27, 32)).(*ebiten.Image)
return player
}
func NewExit(x, y float32) *GameObject{
exit := NewObject(x, y)
exit.image = tilesImage.SubImage(image.Rect(0, 16, 32, 48)).(*ebiten.Image)
return exit
}
func NewBox(x, y float32) *GameObject{
box := NewObject(x, y)
box.image = tilesImage.SubImage(image.Rect(160, 0, 176, 16)).(*ebiten.Image)
return box
}
func NewSpring(x, y float32) *GameObject{
spring := NewObject(x, y)
spring.image = tilesImage.SubImage(image.Rect(176, 0, 192, 16)).(*ebiten.Image)
spring.onCollideY = OnCollideSpring
return spring
}
func NewSpike(x, y float32) *GameObject{
spike := NewObject(x, y)
spike.offsetY = 3
spike.image = tilesImage.SubImage(image.Rect(192, 3, 208, 16)).(*ebiten.Image)
spike.onCollideY = OnCollideSpike
return spike
}
func NewLeftSpike(x, y float32) *GameObject{
spike := NewObject(x, y)
spike.offsetX = 3
spike.image = tilesImage.SubImage(image.Rect(195, 16, 208, 32)).(*ebiten.Image)
spike.onCollideX = OnCollideSpike
return spike
}
func OnCollideSpring(this, other *GameObject) bool {
other.vy -= SPRING_FORCE
other.onGround = true
return false
}
func OnCollideSpike(this, other *GameObject) bool {
other.x = other.startx
other.y = other.starty
return true
}
|
