fishfightback/system/rendermessage.go

93 lines
2.2 KiB
Go

package system
import (
"image/color"
"strings"
"code.rocketnine.space/tslocum/fishfightback/component"
"code.rocketnine.space/tslocum/fishfightback/world"
"code.rocketnine.space/tslocum/gohan"
"github.com/hajimehoshi/ebiten/v2"
"github.com/hajimehoshi/ebiten/v2/ebitenutil"
)
type RenderMessageSystem struct {
Position *component.Position
Velocity *component.Velocity
Weapon *component.Weapon
op *ebiten.DrawImageOptions
logoImg *ebiten.Image
msgImg *ebiten.Image
tmpImg *ebiten.Image
}
func NewRenderMessageSystem() *RenderMessageSystem {
s := &RenderMessageSystem{
op: &ebiten.DrawImageOptions{},
logoImg: ebiten.NewImage(1, 1),
msgImg: ebiten.NewImage(1, 1),
tmpImg: ebiten.NewImage(200, 200),
}
return s
}
func (s *RenderMessageSystem) Update(_ gohan.Entity) error {
if !world.World.GameStarted || world.World.GameOver || !world.World.MessageVisible {
return nil
}
world.World.MessageTicks++
if world.World.MessageTicks == world.World.MessageDuration {
world.World.MessageVisible = false
return nil
}
return nil
}
func (s *RenderMessageSystem) Draw(_ gohan.Entity, screen *ebiten.Image) error {
if !world.World.MessageVisible {
return nil
}
// Draw message.
if world.World.MessageUpdated {
s.drawMessage()
}
bounds := s.msgImg.Bounds()
x := (float64(world.ScreenWidth) / 2) - (float64(bounds.Dx()) / 2)
y := (float64(world.ScreenHeight) / 2) - (float64(bounds.Dy()) / 2)
s.op.GeoM.Reset()
s.op.GeoM.Translate(x, y)
screen.DrawImage(s.msgImg, s.op)
return nil
}
func (s *RenderMessageSystem) drawMessage() {
split := strings.Split(world.World.MessageText, "\n")
width := 0
for _, line := range split {
lineSize := len(line) * 6
if lineSize > width {
width = lineSize
}
}
height := len(split) * 16
const padding = 4
width, height = width+padding*2, height+padding*2
s.msgImg = ebiten.NewImage(width, height)
s.msgImg.Fill(color.RGBA{0, 0, 0, 255})
s.tmpImg.Clear()
s.tmpImg = ebiten.NewImage(width*2, height*2)
s.op.GeoM.Reset()
s.op.GeoM.Scale(1, 1)
s.op.GeoM.Translate(float64(padding), float64(padding))
ebitenutil.DebugPrint(s.tmpImg, world.World.MessageText)
s.msgImg.DrawImage(s.tmpImg, s.op)
s.op.ColorM.Reset()
}