96 lines
1.8 KiB
Go
96 lines
1.8 KiB
Go
package projectile
|
|
|
|
import (
|
|
"image/color"
|
|
|
|
"github.com/hajimehoshi/ebiten/v2"
|
|
"github.com/hajimehoshi/ebiten/v2/vector"
|
|
)
|
|
|
|
type ProjectileConfig struct {
|
|
Speed float64
|
|
Radius float64
|
|
Color color.NRGBA
|
|
}
|
|
|
|
type Projectile struct {
|
|
X float64
|
|
Y float64
|
|
VelocityX float64
|
|
VelocityY float64
|
|
Radius float64
|
|
Color color.NRGBA
|
|
Active bool
|
|
}
|
|
|
|
func New(x, y, directionX, directionY float64, config ProjectileConfig) *Projectile {
|
|
return &Projectile{
|
|
X: x,
|
|
Y: y,
|
|
VelocityX: directionX * config.Speed,
|
|
VelocityY: directionY * config.Speed,
|
|
Radius: config.Radius,
|
|
Color: config.Color,
|
|
Active: true,
|
|
}
|
|
}
|
|
|
|
func (p *Projectile) Update(dt float64, screenWidth, screenHeight float64) {
|
|
p.X += p.VelocityX * dt
|
|
p.Y += p.VelocityY * dt
|
|
|
|
if p.X < 0 || p.X > screenWidth || p.Y < 0 || p.Y > screenHeight {
|
|
p.Active = false
|
|
}
|
|
}
|
|
|
|
func (p *Projectile) Draw(screen *ebiten.Image) {
|
|
if !p.Active {
|
|
return
|
|
}
|
|
vector.DrawFilledCircle(
|
|
screen,
|
|
float32(p.X),
|
|
float32(p.Y),
|
|
float32(p.Radius),
|
|
p.Color,
|
|
false,
|
|
)
|
|
}
|
|
|
|
type Manager struct {
|
|
Projectiles []*Projectile
|
|
}
|
|
|
|
func NewManager() *Manager {
|
|
return &Manager{
|
|
Projectiles: make([]*Projectile, 0),
|
|
}
|
|
}
|
|
|
|
func (m *Manager) Shoot(x, y, directionX float64, config ProjectileConfig) {
|
|
p := New(x, y, directionX, 0, config)
|
|
m.Projectiles = append(m.Projectiles, p)
|
|
}
|
|
|
|
func (m *Manager) Update(dt float64, screenWidth, screenHeight float64) {
|
|
for i := len(m.Projectiles) - 1; i >= 0; i-- {
|
|
p := m.Projectiles[i]
|
|
p.Update(dt, screenWidth, screenHeight)
|
|
|
|
if !p.Active {
|
|
m.Projectiles = append(m.Projectiles[:i], m.Projectiles[i+1:]...)
|
|
}
|
|
}
|
|
}
|
|
|
|
func (m *Manager) Draw(screen *ebiten.Image) {
|
|
for _, p := range m.Projectiles {
|
|
p.Draw(screen)
|
|
}
|
|
}
|
|
|
|
func (m *Manager) Clear() {
|
|
m.Projectiles = make([]*Projectile, 0)
|
|
}
|