boxbrawl/component/player.go

package component

import (
	"fmt"
	"image"
	"image/color"

	"code.rocketnine.space/tslocum/boxbrawl/asset"

	"github.com/hajimehoshi/ebiten/v2"
)

type PlayerAction int

const (
	ActionIdle PlayerAction = iota
	ActionStunned
	ActionPunch
	ActionKick
	ActionBlock
	ActionTaunt1
	ActionTaunt2
	ActionTaunt3
	ActionTaunt4
)

type HitboxType int

const (
	HitboxNone HitboxType = iota
	HitboxNormal
	HitboxHurt
)

type FrameData struct {
	T HitboxType      // Type
	R image.Rectangle // Rect
	S *ebiten.Image   // Sprite
	G int             // Go to frame (for looping actions)
}

const PlayerSize = 16

const (
	PlayerHeight = 48
	PlayerWidth  = 16
)

func RectTouches(r1 image.Rectangle, r2 image.Rectangle) bool {
	return !r1.Empty() && !r2.Empty() &&
		r1.Min.X <= r2.Max.X && r2.Min.X <= r1.Max.X &&
		r1.Min.Y <= r2.Max.Y && r2.Min.Y <= r1.Max.Y
}

// stdHit returns FrameData using a standard hitbox and the provided sprite.
func stdHit(sprite *ebiten.Image) FrameData {
	return FrameData{
		T: HitboxNormal,
		R: image.Rect(0, 0, PlayerWidth, PlayerHeight),
		S: sprite,
	}
}

// stdHitRange returns FrameData using a standard hitbox and the provided sprite range.
func stdHitRange(sprite *ebiten.Image, spriteX int, spriteY int, size int) []FrameData {
	data := make([]FrameData, size)
	for i := 0; i < size; i++ {
		data[i] = stdHit(asset.FrameAt(asset.ImgPlayer, spriteX+i, spriteY))
	}
	return data
}

func FrameDataForActionTick(a PlayerAction, tick int) []FrameData {
	actionFrames := AllPlayerFrames[a]
	if tick-1 >= len(actionFrames) {
		// Handle
		if a == ActionStunned {
			return AllPlayerFrames[ActionStunned][0]
		}
		return nil
	}
	return actionFrames[tick-1]
}

func FlipRect(r image.Rectangle, flip bool) image.Rectangle {
	if !flip {
		return r
	}
	return image.Rect(-r.Min.X+PlayerSize, r.Min.Y, -r.Max.X+PlayerSize, r.Max.Y)
}

func PlayerOnRightSide(p Player, o Player) bool {
	return p.X > o.X
}

type Player struct {
	X, Y      float64
	VX, VY    float64
	Color     color.Color
	PlayerNum int

	Grounded bool

	Action          PlayerAction
	ActionTicksLeft int

	WalkFrame        int
	WalkFrameReverse bool

	Crouching   bool
	CrouchFrame int

	NoPunch bool
	NoKick  bool

	PlayAgain bool
}

func (p *Player) String() string {
	return fmt.Sprintf("Player %d: X:%f Y:%f Action: %d", p.PlayerNum, p.X, p.Y, p.Action)
}

func (p *Player) Clone() Player {
	result := Player{}
	result = *p
	return result
}

func (p *Player) Walking() bool {
	const walkThreshold = 0.2
	return p.Grounded && p.Action == ActionIdle && (p.VX < -walkThreshold || p.VX > walkThreshold)
}

func TranslateRect(r image.Rectangle, x int, y int) image.Rectangle {
	r.Min.X, r.Min.Y = r.Min.X+x, r.Min.Y+y
	r.Max.X, r.Max.Y = r.Max.X+x, r.Max.Y+y
	return r
}

// WalkFrames are defined in chronological order.
var WalkFrames = []*ebiten.Image{
	asset.FrameAt(asset.ImgPlayer, 0, 13),
	asset.FrameAt(asset.ImgPlayer, 1, 13),
	asset.FrameAt(asset.ImgPlayer, 2, 13),
	asset.FrameAt(asset.ImgPlayer, 3, 13),
	asset.FrameAt(asset.ImgPlayer, 4, 13),
	asset.FrameAt(asset.ImgPlayer, 5, 13),
	asset.FrameAt(asset.ImgPlayer, 6, 13),
	asset.FrameAt(asset.ImgPlayer, 7, 13),
}

// CrouchFrames are defined in chronological order.
var CrouchFrames = []*ebiten.Image{
	asset.FrameAt(asset.ImgPlayer, 0, 14),
	asset.FrameAt(asset.ImgPlayer, 1, 14),
	asset.FrameAt(asset.ImgPlayer, 2, 14),
	asset.FrameAt(asset.ImgPlayer, 3, 14),
	asset.FrameAt(asset.ImgPlayer, 4, 14),
	asset.FrameAt(asset.ImgPlayer, 5, 14),
	asset.FrameAt(asset.ImgPlayer, 6, 14),
	asset.FrameAt(asset.ImgPlayer, 7, 14),
	asset.FrameAt(asset.ImgPlayer, 8, 14),
	asset.FrameAt(asset.ImgPlayer, 9, 14),
}

// CrouchWalkFrames are defined in chronological order.
var CrouchWalkFrames = []*ebiten.Image{
	asset.FrameAt(asset.ImgPlayer, 0, 15),
	asset.FrameAt(asset.ImgPlayer, 1, 15),
	asset.FrameAt(asset.ImgPlayer, 2, 15),
	asset.FrameAt(asset.ImgPlayer, 3, 15),
	asset.FrameAt(asset.ImgPlayer, 4, 15),
	asset.FrameAt(asset.ImgPlayer, 5, 15),
	asset.FrameAt(asset.ImgPlayer, 6, 15),
	asset.FrameAt(asset.ImgPlayer, 7, 15),
}