bullet-hell/player.go

package main

import (
	"fmt"

	rl "github.com/gen2brain/raylib-go/raylib"
)

type player struct {
	pos                rl.Vector2
	speed              rl.Vector2
	direction          rl.Vector2
	moveSpeed          float32
	bulletMoveSpeed    float32
	hitBoxRadius       float32
	shoot              shootingPattern
	bulletSize         float32
	focusMode          bool
	focusSpeedDecrease float32
}

func (p *player) Pos() rl.Vector2 {
	return p.pos
}

func (p *player) SetPos(x rl.Vector2) {
	p.pos = x
}

func (p *player) Direction() rl.Vector2 {
	return p.direction
}

func (p *player) move(g *game) {

	var moveSpeed float32
	if p.focusMode {
		moveSpeed = p.moveSpeed * p.focusSpeedDecrease
	} else {
		moveSpeed = p.moveSpeed
	}

	p.speed = rl.Vector2{X: 0, Y: 0}

	if rl.IsKeyDown(rl.KeyW) {
		p.speed.Y -= 1
	}
	if rl.IsKeyDown(rl.KeyS) {
		p.speed.Y += 1
	}
	if rl.IsKeyDown(rl.KeyA) {
		p.speed.X -= 1
	}
	if rl.IsKeyDown(rl.KeyD) {
		p.speed.X += 1
	}

	if !(p.speed.X == 0 && p.speed.Y == 0) {
		// jogador se move mais rapido na diagonal caso o contrario
		p.speed = rl.Vector2Normalize(p.speed)
		p.speed = rl.Vector2Scale(p.speed, moveSpeed)
	}

	result := rl.Vector2Add(p.pos, rl.Vector2Scale(p.speed, rl.GetFrameTime()))

	if result.Y-p.hitBoxRadius < 0 || result.Y+p.hitBoxRadius > float32(g.arenaHeight) {
		p.speed.Y = 0
	}
	if result.X-p.hitBoxRadius < 0 || result.X+p.hitBoxRadius > float32(g.arenaWidth) {
		p.speed.X = 0
	}

	p.pos = rl.Vector2Add(p.pos, rl.Vector2Scale(p.speed, rl.GetFrameTime()))
}

// func (p *player) shoot(g *game) {
// 	if p.focusMode {
// 		return
// 	}
//
// 	if int(g.frame)%3 != 0 {
// 		return
// 	}
//
// 	if rl.IsMouseButtonDown(rl.MouseLeftButton) {
// 		mouse := rl.GetMousePosition()
// 		direction := rl.Vector2Subtract(mouse, p.pos)
// 		direction = rl.Vector2Add(direction, p.speed)
// 		direction = rl.Vector2Normalize(direction)
// 		direction = rl.Vector2Scale(direction, p.bulletMoveSpeed)
//
// 		g.bullets = append(g.bullets, &bullet{
// 			pos:   p.pos,
// 			size:  p.bulletSize,
// 			speed: direction,
// 			dmg:   1,
// 			enemy: false,
// 		})
// 	}
// }

func (p *player) checkHit(g *game) {
	for _, bullet := range g.bullets {
		_, playerBullet := bullet.owner.(*player)
		if playerBullet {
			continue
		}
		distance := rl.Vector2Distance(p.pos, bullet.pos) - bullet.size

		if distance < p.hitBoxRadius {
			// fmt.Println("hit!")
		}
	}
}

func (p *player) checkFocus() {
	// raylib não entende keybindings customizadas através do xmodmap?
	p.focusMode = rl.IsKeyDown(rl.KeyLeftShift) || rl.IsKeyDown(rl.KeyRightShift)
}

func (p *player) update(g *game) {

	p.checkFocus()

	p.move(g)

	if !p.focusMode && p.shoot != nil {
		p.shoot(p)
	}

	p.checkHit(g)

	// hitbox
	rl.DrawCircleV(p.pos, p.hitBoxRadius, rl.Red)

	if p.focusMode {
		return
	}
	// mira
	mouse := rl.GetMousePosition()
	inverted := rl.Vector2Subtract(p.pos, mouse)
	inverted = rl.Vector2Negate(inverted)
	inverted = rl.Vector2Normalize(inverted)
	inverted = rl.Vector2Scale(inverted, 2000)
	rl.DrawLineEx(p.pos, rl.Vector2Add(mouse, inverted), 3, rl.NewColor(255, 0, 0, 100))

}

func tripleFire(g *game) shootingPattern {
	t := newTimer(second * 0.05)
	return func(b body) {

		if !t.isTimeout() {
			t.tick(g)
			return
		}
		t.reset()

		if rl.IsMouseButtonDown(rl.MouseLeftButton) {

			g.bullets = append(g.bullets, &bullet{
				pos:  b.Pos(),
				size: 9,
				speed: rl.Vector2Scale(
					rl.Mat2MultiplyVector2(rl.Mat2Radians(0.3), b.Direction()),
					600,
				),
				dmg:   1,
				owner: b,
			})
			g.bullets = append(g.bullets, &bullet{
				pos:  b.Pos(),
				size: 9,
				speed: rl.Vector2Scale(
					rl.Mat2MultiplyVector2(rl.Mat2Radians(0), b.Direction()),
					600,
				),
				dmg:   1,
				owner: b,
			})
			g.bullets = append(g.bullets, &bullet{
				pos:  b.Pos(),
				size: 9,
				speed: rl.Vector2Scale(
					rl.Mat2MultiplyVector2(rl.Mat2Radians(-0.3), b.Direction()),
					600,
				),
				dmg:   1,
				owner: b,
			})
		}

		// rl.matrix
	}
}

func snipe(g *game) shootingPattern {
	t := newTimer(1)
	hits := 0
	return func(b body) {

		p, ok := b.(*player)
		if !ok {
			panic(b)
		}

		if !t.isTimeout() {
			t.tick(g)
			return
		}

		if !rl.IsMouseButtonPressed(rl.MouseLeftButton) {
			return
		}

		t.reset()

		mouse := rl.GetMousePosition()
		direction := rl.Vector2Subtract(mouse, p.pos)
		direction = rl.Vector2Add(direction, rl.Vector2Scale(p.speed, rl.GetFrameTime()*g.gameSpeed))
		direction = rl.Vector2Normalize(direction)
		direction = rl.Vector2Scale(direction, p.bulletMoveSpeed*700)

		g.bullets = append(g.bullets, &bullet{
			pos:   b.Pos(),
			size:  p.bulletSize,
			speed: direction,
			dmg:   10 * hits,
			owner: b,
			onHit: func(b body) {
				hits += 2
				fmt.Println("hit!", hits)
			},
			onDestroy: func() {
				hits--
				hits = max(hits, 0)
				fmt.Println("hit!", hits)
			},
		})

	}

}