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package main
import (
"age_of_empires/physics"
"github.com/hajimehoshi/ebiten/v2"
"golang.org/x/exp/slog"
)
const SELECTION_HALO_WIDTH = 10
type Selection struct {
IsSelected bool
Halo *ebiten.Image
}
func (e *Entity) SelectMultiple(cursor physics.Point, selection GlobalSelection) {
if !e.Selection.IsEnabled {
return
}
e.Selection.Value.IsSelected = false
selectionBounds := physics.Rectangle{Min: selection.Start, Max: cursor}.Canon()
if selectionBounds.Overlaps(e.Bounds()) {
e.Selection.Value.IsSelected = true
slog.Info("entity selected", slog.String("position", e.Position.Value.String()))
}
}
func (e *Entity) SelectSingle(cursor physics.Point, canBeSelected bool) bool {
if !e.Selection.IsEnabled {
return false
}
e.Selection.Value.IsSelected = false
if !canBeSelected || cursor.In(e.Bounds()) {
return false
}
e.Selection.Value.IsSelected = true
slog.Info("entity selected", slog.String("position", e.Position.Value.String()))
return true
}
func DrawSelection(screen *ebiten.Image, e *Entity) {
if e.Image.IsEnabled && e.Position.IsEnabled && e.Selection.IsEnabled {
if e.Selection.Value.IsSelected {
opt := &ebiten.DrawImageOptions{}
opt.GeoM.Translate(float64(e.Position.Value.X-SELECTION_HALO_WIDTH/2), float64(e.Position.Value.Y-SELECTION_HALO_WIDTH/2))
screen.DrawImage(e.Selection.Value.Halo, opt)
}
}
}
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